Journal articles: 'Post weld heat treatment'

1

Okabayashi, Hisaki. "Post Weld Heat Treatment, Applications." Journal of the Japan Welding Society 65, no. 3 (1996): 199–203. http://dx.doi.org/10.2207/qjjws1943.65.3_199.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Tanaka, Jinkichi. "Why is Post Weld Heat Treatment required?" Journal of the Japan Welding Society 65, no. 3 (1996): 196–98. http://dx.doi.org/10.2207/qjjws1943.65.3_196.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Parzych, Sławomir, and Rafał Dziurka. "Influence of post weld heat treatment for weld joint of P355GH." MATEC Web of Conferences 247 (2018): 00038. http://dx.doi.org/10.1051/matecconf/201824700038.

Full text

Abstract:

From steel designed to work under pressure and exposed to high temperature apart from the good weldability, good mechanical properties are required. The guidelines set by the regulations require post welding heat treatment above 35mm thick. An important factor affecting the microstructure and properties of the joint made of thick-walled elements is heat treatment after welding. All welding operations must be properly planned before performing welding work. Welding procedure specification (WPS) is a document describing these operations, it is essential for proper determining of basics in planning welding operations and quality control in welding. The purpose of this paper is to compare the properties of joints made by 121 welding method in combination with and without post welding heat treatment.

APA, Harvard, Vancouver, ISO, and other styles

4

Santisteban, Javier R., L. Fernández, H. Corso, R. L. Martínez, L. Boccanera, Lyndon Edwards, Jonathan A. James, and Mark Turski. "Post-Weld Heat Treatment Stress Relaxation in Zircaloy 4 Plasma Welds." Materials Science Forum 524-525 (September 2006): 491–96. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.491.

Full text

Abstract:

We have studied the effect of a post-weld heat treatment on plasma arc welds on Zircaloy 4 plates. The samples consist of two 100 mm long, 50 mm wide, and 6.25 mm thick plates, welded along the rolling (longitudinal) direction. The heat-treatment consisted of a steady increase in temperature from room temperature to 450oC over a period of 4.5 hours; followed by cooling with an equivalent cooling rate. Residual strains and stresses along the longitudinal, transverse and normal directions on an as-welded and a heat-treated specimen were measured by neutron diffraction on the ENGIN-X beamline at the Isis Facility, Rutherford Laboratory, UK. Peak tensile stresses of (105±25) MPa were found in the as-welded specimen, which were reduced to (70±20) MPa after the heat-treatment. Thermal compressive stresses of (-80±20) MPa were found along the normal direction, which were not affected by the heat treatment. The use of a full-pattern Rietveld refinement for the determination of bulk strains in Zircaloy specimens is also discussed.

APA, Harvard, Vancouver, ISO, and other styles

5

Consonni, M., and D. J. Abson. "Investigation of weld repair without post-weld heat treatment for P91." Zavarivanje i zavarene konstrukcije 62, no. 2 (2017): 77–89. http://dx.doi.org/10.5937/zzk1702077c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Brett, S. J., and K. C. Mitchell. "Weld repair of grade 91 steel without post-weld heat treatment." Materials Research Innovations 17, no. 5 (August 2013): 312–17. http://dx.doi.org/10.1179/1432891713z.000000000253.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Agilan, M., T. Venkateswaran, D. Sivakumar, and Bhanu Pant. "Effect of Post Weld Heat Treatment on Mechanical Properties and Microstructure of Nickel Based Super Alloy Welds." Advanced Materials Research 585 (November 2012): 435–39. http://dx.doi.org/10.4028/www.scientific.net/amr.585.435.

Full text

Abstract:

In the present paper, Haynes 214 plate of 7mm thick was welded by Gas tungsten arc welding (GTAW) in two passes. The welded plates were subjected to post-weld heat treatment such as direct aging (DA) and solution treatment + aging (STA). The aging cycle was optimized using hardness by generating isothermal aging curve. The weld tensile properties, hardness test, microscopic analysis and fractographic studies were carried out in as-welded condition and at two different post-weld heat treatment conditions. The results show a significant increase in both yield and tensile strength after post weld heat treatment.

APA, Harvard, Vancouver, ISO, and other styles

8

Xu, J. J., L. G. Chen, and C. Z. Ni. "Low stress welding technology without post-weld heat treatment." Materials Science and Technology 25, no. 8 (August 2009): 976–80. http://dx.doi.org/10.1179/174328408x369393.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Tian, Lei, Zhanqi Gao, and Yongdian Han. "Effect of post-weld heat treatment on microstructure and corrosion properties of multi-layer super duplex stainless steel welds." Materials Testing 63, no. 9 (September 1, 2021): 791–96. http://dx.doi.org/10.1515/mt-2021-0015.

Full text

Abstract:

Abstract To investigate the influence of post-weld heat treatment on the microstructure and corrosion properties of super duplex stainless steel welded joints, multi-layer multi-pass welding of 2507 super duplex stainless steel by tungsten argon arc welding was performed using an ER2594 welding wire. The microstructures of the welded joints before and after post-weld heat treatment at 1150 °C, 1170 °C and 1190 °C were observed, and the mechanical and corrosion properties were tested. The post-weld heat treatment changed the austenite content and morphology of the welded joint and improved the corrosion resistance of different parts of the weld metal. The choice of various solution heat treatment temperatures affected the change in austenite content in the weld zone and the degree of diffusion and homogenization of the alloy elements. After post-weld heat treatment at 1170 °C, the two-phase ratios in each area of the weld were the most suitable and uniform, and the overall mechanical and corrosion properties of the joint were more uniform.

APA, Harvard, Vancouver, ISO, and other styles

10

Aydın, Hakan, Ali Bayram, and İsmail Durgun. "An investigation on microstructure and mechanical properties of post-weld heat-treated friction stir welds in aluminum alloy 2024-W." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 4 (June 27, 2012): 649–62. http://dx.doi.org/10.1177/0954406212452479.

Full text

Abstract:

The present work describes the results obtained from microstructural and mechanical evaluation of post-weld heat treated friction stir welds of 2024 aluminum alloys in the W temper state. Post-weld heat treatments have been carried out at 510 °C for 2.5 h followed by ageing at room temperature for 6 months, at 100 °C and 190 °C for 10 h, and by cooling in static air (O-temper). The solution treatment caused abnormal coarsening of the grains in the stir zone, which resulted in a drop in microhardness. The strength of the as-welded joint was significantly incrased by post weld heat treatments. The maximum hardness and strength values were obtained in T6 (190 °C, 10 h) treated joint. However, the T6 (190 °C, 10 h) treated joint had the lowest ductility. On the other hand, the tensile properties of the post-weld heat treated joints were far lower than those of the unwelded base materials in the same temper states. In addition, the post-weld heat treatments did not significantly change the fracture locations of the friction stir welds.

APA, Harvard, Vancouver, ISO, and other styles

11

Rojhirunsakool, Tanaporn, Duangkwan Thongpian, Nutthita Chuankrerkkul, and Panyawat Wangyao. "Effect of Pre-Weld Heat Treatment Temperatures on TIG Welded Microstructures on Nickel Base Superalloy, GTD-111." Key Engineering Materials 658 (July 2015): 14–18. http://dx.doi.org/10.4028/www.scientific.net/kem.658.14.

Full text

Abstract:

Nickel-base superalloys have been used as high temperature materials in land-base gas turbine application. When subjected to long term, high temperature service, large crack propagation was observed. Typical refurbishment method of these turbines is carried out by using TIG welding followed by post-weld standard heat treatment. However, new crack initiation is found in the heat-affected zone after TIG welding. Pre-weld heat treatment has been discovered to improves final γ + γ’ microstructure. This study focuses on the effect of pre-weld heat treatment temperature on final γ + γ’ microstructure. Seven different conditions of pre-weld heat treatment temperature were investigated. Scanning electron microscopy studies were carried out after pre-weld and post-weld heat treatments to compare the γ + γ’ microstructure and capture microcracks. The best pre-weld heat treatment temperature produces uniform distribution of finely dispersed γ’ precipitates in the γ matrix without post-weld crack.

APA, Harvard, Vancouver, ISO, and other styles

12

Angkasa, Sendy, Whina Septi Berlianzana Prastya, Poppy Puspitasari, and Aminnudin Aminnudin. "Phase Identification and Mechanical Properties on Post Weld Heat Treatment of Steel St.70." Key Engineering Materials 851 (July 2020): 53–60. http://dx.doi.org/10.4028/www.scientific.net/kem.851.53.

Full text

Abstract:

In this era, technological advances in the field of construction and industry cannot be separated from welding, while the welding of medium carbon steel is a material that is widely applied using electric arc shielded electrodes and to obtain good results a post weld heat treatment (PWHT) process can be carried out. One of the heat treatments that can be applied to the post weld heat treatment is stress relief annealing. So in this paper a test was conducted to determine the value of ST70 hardness and steel phase from welding with stress relief temperature variations of annealing 600°C, 650°C, and 700°C in the weld metal area and heat affected zone. To find out the results of testing of the post weld heat treatment process with annealing stress relief method at temperatures of 600°C, 650°C, and 700°C in the weld metal area and heat affected zone, the tests used were microstructure, micro vickers hardness and X-Ray Diffraction. The results of the hardness test show that without the post weld heat treatment process the hardness in the heat affected zone is 311.8 HV and in the weld metal area is 329 HV. Whereas from the results of the diffraction phase analysis in the heat affected zone the development of grain size rises regularly along with the increase in temperature in the stress relief annealing process.

APA, Harvard, Vancouver, ISO, and other styles

13

Kim, Nam Yong, Jeoung Han Kim, Yu Sik Kong, Jong Won Yoon, Jong Taek Yeom, Dong Geun Lee, and Nho Kwang Park. "The Effect of Post Weld Heat Treatment on Mechanical Properties of Friction-Welded Alloy 718 and SNCRW Stainless Steel." Advanced Materials Research 26-28 (October 2007): 511–14. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.511.

Full text

Abstract:

The effect of post weld heat treatment on mechanical properties of friction welded Alloy 718 and SNCRW was investigated. Friction welding tests were carried out at a constant rotation speed and pressure. Optimum friction condition was found to be the friction pressure of 25kg/cm2, friction time of 40sec, upset pressure of 80 kg/cm2, and dwell time of 5sec. After friction welding tests, post weld heat treatments were performed in the temperature range of 500-900°C for 8hrs in order to investigate the microstructure and mechanical properties of weld joint. Specimens with the post weld heat treatment at 720°C for 8hrs show optimal mechanical properties. Residual stress of post weld heat treated specimens was measured to weld joint in the same temperature range. After friction welding tests on samples with a diameter of 80mm, tensile properties of post-weld-heat-treated and non-heat-treated samples were compared.

APA, Harvard, Vancouver, ISO, and other styles

14

Liu, J., H. Qiao, and Y. Hu. "The influence of post-weld heat treatment on microstructure of TC4 weld joints." Materials Research Innovations 19, sup5 (May 2015): S5–585—S5–587. http://dx.doi.org/10.1179/1432891714z.0000000001157.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Liu, Zichen, Xiaodong Hu, Zhiwei Yang, Bin Yang, Jingkai Chen, Yun Luo, and Ming Song. "Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint." Metals 11, no. 1 (January 10, 2021): 127. http://dx.doi.org/10.3390/met11010127.

Full text

Abstract:

In order to clarify the role of different post-weld heat treatment processes in the manufacturing process, welding tests, post-weld heat treatment tests, and finite element analysis (FEA) are carried out for 12C1MoV steel pipes. The simulated temperature field and residual stress field agree well with the measured results, which indicates that the simulation method is available. The influence of post-weld heat treatment process parameters on residual stress reduction results is further analyzed. It is found that the post weld dehydrogenation treatment could not release residual stress obviously. However, the residual stress can be relieved by 65% with tempering treatment. The stress relief effect of “post weld dehydrogenation treatment + temper heat treatment” is same with that of “temper heat treatment”. The higher the temperature, the greater the residual stress reduction, when the peak temperature is at 650–750 °C, especially for the stress concentration area. The longer holding time has no obvious positive effect on the reduction of residual stress.

APA, Harvard, Vancouver, ISO, and other styles

16

Liu, Zichen, Xiaodong Hu, Zhiwei Yang, Bin Yang, Jingkai Chen, Yun Luo, and Ming Song. "Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint." Metals 11, no. 1 (January 10, 2021): 127. http://dx.doi.org/10.3390/met11010127.

Full text

Abstract:

In order to clarify the role of different post-weld heat treatment processes in the manufacturing process, welding tests, post-weld heat treatment tests, and finite element analysis (FEA) are carried out for 12C1MoV steel pipes. The simulated temperature field and residual stress field agree well with the measured results, which indicates that the simulation method is available. The influence of post-weld heat treatment process parameters on residual stress reduction results is further analyzed. It is found that the post weld dehydrogenation treatment could not release residual stress obviously. However, the residual stress can be relieved by 65% with tempering treatment. The stress relief effect of “post weld dehydrogenation treatment + temper heat treatment” is same with that of “temper heat treatment”. The higher the temperature, the greater the residual stress reduction, when the peak temperature is at 650–750 °C, especially for the stress concentration area. The longer holding time has no obvious positive effect on the reduction of residual stress.

APA, Harvard, Vancouver, ISO, and other styles

17

Alipooramirabad, Houman, Anna Paradowska, Shahrooz Nafisi, Mark Reid, and Reza Ghomashchi. "Post-Weld Heat Treatment of API 5L X70 High Strength Low Alloy Steel Welds." Materials 13, no. 24 (December 18, 2020): 5801. http://dx.doi.org/10.3390/ma13245801.

Full text

Abstract:

High Strength Low Alloy (HSLA) steels are the materials of choice in pipeline construction with the API X70 grade as the steel for the majority of pipeline networks constructed during the late 20th and early this century. This paper reports on the influence of Post-Weld Heat Treatment (PWHT) on the reduction of residual stresses, resulting changes in the microstructure, and mechanical properties of a multi-pass, X70 HSLA steel, weld joints made by a combined Modified Short Arc Welding (MSAW) and Flux Cored Arc Welding (FCAW) processes. Neutron diffraction results highlighted high magnitude of tensile residual stresses, in excess of yield strength of both parent and weld metal, in the as-welded specimen (~650 MPa), which were decreased substantially as a result of applying PWHT (~144 MPa). Detailed microstructural studies are reported to confirm the phase transformation during PWHT and its interrelationship with mechanical properties. Transmission Electron Microscopy (TEM) analysis showed polygonization and formation of sub-grains in the PWHT specimen which justifies the reduction of residual stress in the heat-treated weld joints. Furthermore, microstructural changes due to PWHT justify the improvement in ductility (increase in the elongations) with a slight reduction in yield and tensile strength for the PWHT weld joint.

APA, Harvard, Vancouver, ISO, and other styles

18

Peasura, Prachya, and Lersak Sumarn. "Effect of Post Weld Heat Treatment on Carbon Steel AISI 1050 in Heat Effected Zone." Advanced Materials Research 650 (January 2013): 612–15. http://dx.doi.org/10.4028/www.scientific.net/amr.650.612.

Full text

Abstract:

The research was study the effect of post weld heat treatment parameters on microstructure and hardness in heat affected zone. The specimen was carbon steel AISI 1050 which thickness of 6 mm. The experiments with full factorial design. The factors used in this study were post weld heat treatment(PWHT) temperature of 500, 550, 600, 650 and post weld heat treatment time of 10 and 15 hour. The welded specimens were tested by tensile strength testing and hardness testing according to ASTM code. The result showed that both of post welds heat treatment temperature and post weld heat treatment time had interaction on hardness at 95% confidential (P value < 0.05). A factor affecting the hardness was the most PWHT temperature 550 ๐C and PWHT time 10 hr. of 279 HV. Microstructure can be concluded that low PWHT temperature and time effect on temper martensite with a coarse grain and martensite scattered throughout. Martensite was a smaller and greater fine grain, the ferrite and the volume decrease due to a higher temperature.This research can be used as data in the following appropriate PWHT parameters to carbon steel weld.

APA, Harvard, Vancouver, ISO, and other styles

19

Zhao, M. S., S. P. Chiew, and C. K. Lee. "Post weld heat treatment for high strength steel welded connections." Journal of Constructional Steel Research 122 (July 2016): 167–77. http://dx.doi.org/10.1016/j.jcsr.2016.03.015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Rodriguez, P., S. K. Ray, and A. K. Bhaduri. "Optimisation of post-weld heat treatment — A simple, practical method." Sadhana 28, no. 3-4 (June 2003): 409–30. http://dx.doi.org/10.1007/bf02706441.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Nam, Hyunbin, Chulho Park, Cheolhee Kim, Hyoungseop Kim, and Namhyun Kang. "Effect of post weld heat treatment on weldability of high entropy alloy welds." Science and Technology of Welding and Joining 23, no. 5 (November 29, 2017): 420–27. http://dx.doi.org/10.1080/13621718.2017.1405564.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Rush, Matthew T., Paul A. Colegrove, Zhu Zhang, and David Broad. "Liquation and post-weld heat treatment cracking in Rene 80 laser repair welds." Journal of Materials Processing Technology 212, no. 1 (January 2012): 188–97. http://dx.doi.org/10.1016/j.jmatprotec.2011.09.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Abd Majid, Mohd Amin, and Muhammad Sarwar. "Effect of Post Weld Heat Treatment on Weld Hardness Quality of P91 Welded Pipes." Applied Mechanics and Materials 799-800 (October 2015): 377–81. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.377.

Full text

Abstract:

Quality of a weld produced is generally evaluated by different parameters such as weld size, bead geometry, deposition rate, hardness and strength. A common problem that has been faced at the construction sites is to obtain a good welded joint having the required strength with minimal detrimental residual stresses to avoid any premature cracking due to high variation of hardness. In order to address this issue and to attain good weld quality, this study has been made to comprehend the effect of the post weld heat treatment on P91 material welds produced by TIG welding. Findings from the studies indicate that the PWHT has significant influence on the weld hardness of Alloy Steel-A335 P91 pipes. It is eminent that during cooling, after welding of P91, quenched martensite was formed in the HAZ that results in an increased hardness to an undesirable level of more than 250HB. PWHT at temperature of 760°C for 2 hours has good influence on mechanical properties as the hardness decreases and turns out to be uniformly distributed. If the PWHT is correctly carried out, the hardness of parent metals, heat affected zones and weld metal can be brought into the required limits to avoid any premature cracking due to high variation of hardness.

APA, Harvard, Vancouver, ISO, and other styles

24

Park, Kiduck, Sanghoon Kim, Jungchel Chang, and Changhee Lee. "Post-weld heat treatment cracking susceptibility of T23 weld metals for fossil fuel applications." Materials & Design 34 (February 2012): 699–706. http://dx.doi.org/10.1016/j.matdes.2011.05.029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Sarwar, Muhammad, and Mohd Amin bin Abd Majid. "Weld Hardness Study of P91 Welded Pipes with Post Weld Heat Treatment for Elevated Temperature Application in Power Plants." Advanced Materials Research 1115 (July 2015): 503–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.503.

Full text

Abstract:

The creep strength-enhanced ferritic (CSEF) steels are undergoing an encouraged use around the world especially in power plant construction. On construction sites, it has always been the target to have no problems in welded joints but premature failures are being encountered. The primary reason of these premature failures is found to be the improper heat treatment that is mandatorily carried out to achieve the required weld hardness. Weld hardness has close relationship with creep strength and ductility of the welded structures. Hence it is important for any weld to achieve certain level of weld hardness. This study aims at ascertaining the importance of Post Welding Heat Treatment (PWHT) in achieving the required hardness in creep-strength enhanced ferritic (CSEF) materials.The study was carried out on the welding of alloy steel ASTM A335 Gr. P-91 with the same base material (ASTM A335 Gr. P-91) by Gas Tungsten Arc Welding (GTAW) process using ER90S-B9 filler wire with pre-heat of 200oC (min) and inter-pass temperature of 300oC (max). After welding, the joints were tested for soundness with Radiography testing. Induction heating was used for heat treatment of P91 pipes during welding and post weld heat treatment. The effect of Post Weld Heat Treatment (PWHT) was investigated on the Weld metal and the Heat Affected Zones (HAZ) by hardness testing. It is perceived that the scattered and higher hardness values, more than 250HB in 2” P91 pipes in the weld metal and in the heat affected zones, can be brought into the lower required level, less than 250HB, with an effective post weld heat treatment at 760°C for 2hrs.It is concluded that PWHT is the most effective way of relieving the welding stresses that are produced due to high heat input in the welding process and to achieve the required level of hardness in the weld as well as in the heat affected zones (HAZ) in thermal power plant main steam piping.

APA, Harvard, Vancouver, ISO, and other styles

26

Xiong, Jiankun, Ting Li, Xinjian Yuan, Guijun Mao, Jianping Yang, Lin Yang, and Jian Xu. "Improvement in Weldment of Dissimilar 9% CR Heat-Resistant Steels by Post-Weld Heat Treatment." Metals 10, no. 10 (October 2, 2020): 1321. http://dx.doi.org/10.3390/met10101321.

Full text

Abstract:

The effect of the post-weld heat treatment on the microstructures and mechanical properties of the dissimilar joint of G115, a novel developed martensite heat resistant steel, and CB2 steel, currently used in an ultra-super-critical power unit, was investigated. The results indicate that the quenched martensite underwent decomposition and transformation, and the amount of dislocations were sharply decreased in the weld metal after post-weld heat treatment (PWHT). Many nano-scale M23C6 precipitates present in the weldment were distributed on the grain and grain boundary in a dispersed manner with PWHT. The average microhardness of the weldment decreased from about 400 HV to 265–290 HV after PWHT and only a slight decrease in the microhardness of CB2 steel was detected after PWHT at 760 °C. In contrast to the case of the as-received joint, the tensile strength of the joint was improved from 630 MPa to 694 MPa and the fracture location moved from the weld metal to the base metal after PWHT. The fracture surface consisted of a cleavage fracture mode without PWHT, whereas many dimples were observed on the fracture surface with PWHT.

APA, Harvard, Vancouver, ISO, and other styles

27

Akbari Mousavi, Seyed Ali Asghar, and S. A. Hoseini Hosein Abad. "Effects of Post Weld Ageing Heat Treatments on the Microstructure of 17-4PH GTA Welded Joints." Advanced Materials Research 264-265 (June 2011): 1300–1305. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1300.

Full text

Abstract:

The mechanical and metallurgical properties of the 630 (17-4PH) precipitation hardening stainless steel is greatly influenced by the type of applied heat treatments cycles. In order to achieve the homogenous microstructure in the weld metal and eliminate the HAZ due to producing the weak mechanical strength, and producing similar microstructures and mechanical strength in both weld and base metal, the study was conducted to find an optimum pre and post heat treatments before and after welding. The 2.2mm thick and 48mm tube diameter made of 630 stainless steel were welded under various operational parameters. The samples were subjected to pre weld solution treatment and post weld aging heat treatment. To reveal the microstructures of the welds, the optical and scanning electron microscopy of the welds carried out. The study shows that the direct ageing treatment at 6200C after welding can give rise to the best heat treatment to produce, the uniformity in the grain size, mechanical strength and hardness, between the base metal and the weld metal.

APA, Harvard, Vancouver, ISO, and other styles

28

Prabhakar, A. Sam, M. Agilan, T. Venkateswaran, D. Sivakumar, and P. G. Venkatakrishnan. "Effect of Post Weld Heat Treatment on Mechanical Properties of 17-4-PH Stainless Steel Welds." Materials Science Forum 830-831 (September 2015): 181–84. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.181.

Full text

Abstract:

Precipitation hardening stainless steel (17-4-PH) of 3 mm thick sheet was welded by gas tungsten arc welding (GTAW) process using a matching composition filler wire of ER 630. The welds were subjected to various post weld heat treatment (PWHT) cycles viz., H900, H1025 and H1150. Tensile properties (UTS, 0.2% YS, and % EL.), hardness survey across the weld and detailed optical microscopy have been carried-out on as-welded and after different PWHT conditions samples. Results showed that H900 heat treatment condition attained higher mechanical properties than H1025 and H1150.

APA, Harvard, Vancouver, ISO, and other styles

29

Dong, Pingsha, Shaopin Song, and Jinmiao Zhang. "Analysis of residual stress relief mechanisms in post-weld heat treatment." International Journal of Pressure Vessels and Piping 122 (October 2014): 6–14. http://dx.doi.org/10.1016/j.ijpvp.2014.06.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

kumar, M. Mohandas Pravin, M. Deepak Kumar, and V. Karthik. "Weldability and Post Weld Heat Treatment of T23 Boiler Grade Steel." International Journal of Advanced Engineering Research and Science 4, no. 2 (2017): 168–71. http://dx.doi.org/10.22161/ijaers.4.2.33.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Fang, Chao, Kejian Li, Houyu Ma, Yinsheng He, Keunbong Yoo, Jine-Sung Jung, and Keesam Shin. "Microstructural Evolution of TP347H After Post Weld Heat Treatment and Aging." Science of Advanced Materials 8, no. 12 (December 1, 2016): 2260–63. http://dx.doi.org/10.1166/sam.2016.2881.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Silva, Cleiton C., Victor H. C. de Albuquerque, Cícero R. O. Moura, Willys M. Aguiar, and Jesualdo P. Farias. "Evaluation of AISI 4140 Steel Repair Without Post-Weld Heat Treatment." Journal of Materials Engineering and Performance 18, no. 3 (August 26, 2008): 324–31. http://dx.doi.org/10.1007/s11665-008-9294-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Aloraier, A., R. Ibrahim, and P. Thomson. "FCAW process to avoid the use of post weld heat treatment." International Journal of Pressure Vessels and Piping 83, no. 5 (May 2006): 394–98. http://dx.doi.org/10.1016/j.ijpvp.2006.02.028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Betini, E. G., C. S. Mucsi, T. S. Luz, M. T. D. Orlando, M.-N. Avettand-Fènoël, and J. L. Rossi. "Effect of post-weld heat treatment on thermal diffusivity in UNS S32304 duplex stainless steel welds." Archives of Materials Science and Engineering 2, no. 88 (December 1, 2017): 49–58. http://dx.doi.org/10.5604/01.3001.0010.8039.

Full text

Abstract:

Purpose: The thermal diffusivity variation of UNS S32304 duplex stainless steel welds was studied after pulsed GTA welding autogenous process without filler addition. This property was measured in the transverse section of thin plates after welding process and post-heat treated at 750°C for 8 h followed by air-cooling. Design/methodology/approach: The present work reports measurements of thermal diffusivity using the laser-flash method. The thermal cycles of welding were acquired during welding by means of k-type thermocouples in regions near the weld joint. The used shielding gas was pure argon and 98% argon plus 2% of nitrogen. The temperature profiles were obtained using a digital data acquisition system. Findings: It was found an increase of thermal diffusivity after welding process and a decrease of these values after the heat treatment regarding the solidified weld pool zone, irrespective of the welding protection atmosphere. The microstructure was characterized and an increase of austenite phase in the solidified and heat-affected zones was observed for post-weld heat-treated samples. Research limitations/implications: It suggests more investigation and new measurements about the influence of the shielding gas variation on thermal diffusivity in the heat-affected zone. Practical implications: The nuclear industry, especially, requests alloys with high thermal stability in pipes for power generation systems and safe transportation equipment’s for radioactive material. Thus, the duplex stainless steel grades have improved this stability over standard grades and potentially increase the upper service temperature reliability of the equipment. Originality/value: After heat treatment, the welded plate with 98%Ar plus 2%N2 as shielding gas presented a thermal diffusivity closer to the as received sample. By means of 2%-nitrogen addition in shielding gas during GTAW welding of duplex stainless steel may facilitate austenite phase reformation, and then promotes stability on the thermal diffusivity of duplex stainless steels alloys.

APA, Harvard, Vancouver, ISO, and other styles

35

Anwar, Saqib, Ateekh Ur Rehman, Yusuf Usmani, and Ali M. Al-Samhan. "Influence of Post Weld Heat Treatment on the Grain Size, and Mechanical Properties of the Alloy-800H Rotary Friction Weld Joints." Materials 14, no. 16 (August 4, 2021): 4366. http://dx.doi.org/10.3390/ma14164366.

Full text

Abstract:

This study evaluated the microstructure, grain size, and mechanical properties of the alloy 800H rotary friction welds in as-welded and post-weld heat-treated conditions. The standards for the alloy 800H not only specify the composition and mechanical properties but also the minimum grain sizes. This is because these alloys are mostly used in creep resisting applications. The dynamic recrystallization of the highly strained and plasticized material during friction welding resulted in the fine grain structure (20 ± 2 µm) in the weld zone. However, a small increase in grain size was observed in the heat-affected zone of the weldment with a slight decrease in hardness compared to the base metal. Post-weld solution heat treatment (PWHT) of the friction weld joints increased the grain size (42 ± 4 µm) in the weld zone. Both as-welded and post-weld solution heat-treated friction weld joints failed in the heat-affected zone during the room temperature tensile testing and showed a lower yield strength and ultimate tensile strength than the base metal. A fracture analysis of the failed tensile samples revealed ductile fracture features. However, in high-temperature tensile testing, post-weld solution heat-treated joints exhibited superior elongation and strength compared to the as-welded joints due to the increase in the grain size of the weld metal. It was demonstrated in this study that the minimum grain size requirement of the alloy 800H friction weld joints could be successfully met by PWHT with improved strength and elongation, especially at high temperatures.

APA, Harvard, Vancouver, ISO, and other styles

36

Burke, M. G., and N. T. Nuhfer. "Phase Transformations in an Austenitic Stainless Steel Weld During Postweld Heat Treatment." Microscopy and Microanalysis 7, S2 (August 2001): 548–49. http://dx.doi.org/10.1017/s1431927600028816.

Full text

Abstract:

The microstructural development in a Type 309 stainless steel weldment associated with a post-weld heat treatment of 30 h at 580°C has been studied using analytical electron microscopy (AEM). The purpose of post-weld thermal treatments is generally to relieve stresses within the weld, thereby improving performance. Microstructural stability during these thermal treatments is important for the weld; i.e., no deleterious phases should form. in this example, detailed microstructural analyses of a weldment in the as-welded and postweld heat-treated condition have been performed. Microstructural analyses were performed using Philips CM 12 and CM300-FEG analytical electron microscopes equipped with Oxford Instruments ISIS analyzers and LZ5 energy dispersive x-ray spectrometers, and a CM200-FEG analytical electron microscope equipped with a Gatan Image Filter (GIF).As-Welded Condition:The microstructure of the weld was characterized by the presence of dislocated austenite (γ) and a network of delta (δ) ferrite.

APA, Harvard, Vancouver, ISO, and other styles

37

Rajesh, S., and Vishvesh J. Badheka. "Effect of friction stir lap weld and post weld heat treatment on corrosion behavior of dissimilar aluminum alloys." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 6 (February 7, 2017): 1053–64. http://dx.doi.org/10.1177/1464420717692150.

Full text

Abstract:

This study has been undertaken to evaluate the electrochemical behavior of friction stir lap welded V-95CHT1 and D19CHT plates and to study the effect of post weld heat treatment on the corrosion characteristics of the welded alloys. The corrosion characteristics were tested as per ASTM G-34 standard by immersion in EXCO solution and analyzing the corroded plates through optical imaging and scanning electron microscopic analysis. Cyclic polarization tests were also undertaken to validate the results of the immersion test. It was observed that friction stir lap weld had sensitized the V-95 plate with the heat-affected zone of the joint found most susceptible and weld nugget least susceptible to corrosion. Corrosion resistance of the welded plates was also found to be higher for those joints that were welded employing process parameters providing higher weld heat input. Post weld retrogression and re-aging heat treatment was also found to be beneficial in increasing the corrosion resistance of the alloy.

APA, Harvard, Vancouver, ISO, and other styles

38

Bu, Xian Zheng, Ping Shan, Zhen Luo, and Zhen Tai Zheng. "Effect of Post Weld Heat Treatment on Mechanical and Corrosion Properties of Inconel 601." Advanced Materials Research 146-147 (October 2010): 1178–85. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.1178.

Full text

Abstract:

The effect of post weld heat treatment on microstructures, tensile and corrosion properties of Inconel601 weld seam was investigated. The results indicated that the microstructure of weld metal consisted of coarser columnar grains with (Nb, Ti)-rich precipitations and laves phase distributed in them. Tensile and corrosion test displayed that the weld seam without any heat treatment exhibit the lowest mechanical and corrosion properties. Solution treatment at 1050°C was found to result in the considerable refinement of grain size and finally the improvement of mechanical and corrosion properties. It was also found that the specimens had the best mechanical and corrosion properties after heat treatment at 1150°C. However, with the treatment temperature increasing to 1200°C, the grain began to grow up, leading to the decrease of tensile strength and corrosion resistance.

APA, Harvard, Vancouver, ISO, and other styles

39

de Oliveira, Clélia Ribeiro, Eloá Lopes Maia, Solange T. da Fonseca, Marcelo Martins, Julián Arnaldo Ávila Díaz, and Paulo Roberto Mei. "Effect of Post-Weld Heat Treatment on Hardness in Superduplex Stainless Steel ASTM A890/A890M - Grade 6A." Materials Science Forum 1012 (October 2020): 296–301. http://dx.doi.org/10.4028/www.scientific.net/msf.1012.296.

Full text

Abstract:

Superduplex stainless steel alloy exhibit high mechanical and corrosion resistance, which main industrial application is in the petrochemical industry. The manufacture and maintenance of such equipment usually involve welding processes, followed by post-welded heat treatment and it often becomes impossible to apply heat treatments. Thereby, the purpose of this work is to verify the effect of a post-welded heat treatment on shielded metal arc welding in steel grade ASTM A890/A890M - grade 6A. The microstructure in the as-welded condition consisted of austenite, secondary austenite, and ferrite phases and, the post-welded heat treatment condition exhibited only austenite and ferrite. The hardness in the melt zone reached values of 300 HV after welding and, the value was reduced to 260 HV in the post-welded heat treatment condition.

APA, Harvard, Vancouver, ISO, and other styles

40

Tian, Songya, Fan Xu, Genyuan Zhang, Adnan Saifan, Bassiouny Saleh, and Xiaobo Li. "Influence of Post-Weld Heat Treatment on Microstructure and Toughness Properties of 13MnNiMoR High Strength Low Alloy Steel Weld Joint." Materials 14, no. 18 (September 16, 2021): 5336. http://dx.doi.org/10.3390/ma14185336.

Full text

Abstract:

Weld and base metals require hot or cold working during the steel equipment manufacturing process. As a result, the components should be subjected to a normalizing heat treatment in order to recover their mechanical properties. In this study, the submerged-arc welding of the high strength low alloy (HSLA) thick steel plate(13MnNiMoR) is adapted for the vessel head under the normalizing and tempering heat treatment. The findings showed that the material toughness decreases after heating to simulate a vessel head forming process. The stamping process is carried out under the conditions of 980 °C for one hour, normalizing at 920 °C for 1 h and tempering between 600–660 °C for 2 h, respectively. The martensite-austenite (M-A) constituent is distributed in granular bainite and the boundary of austenite in island constituent. Therefore, it was deemed to be the most detrimental to Charpy-V impact toughness. Between normalizing and tempering, intercritical normalizing at 740 °C was added. As a result of the ferrite with fine particles M-A constituent, the toughness increases significantly.

APA, Harvard, Vancouver, ISO, and other styles

41

Boonchouytan, Worapong, Thanate Ratanawilai, and Prapas Muangjunburee. "Effect of Pre/Post Heat Treatment on the Friction Stir Welded SSM 356 Aluminum Alloys." Advanced Materials Research 488-489 (March 2012): 328–34. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.328.

Full text

Abstract:

The butt joints of semi solid 356 were produced in as cast conditions by friction stir welding process (FSW). This experiment studied in pre/post heat treatment (T6) using the welding speed 160 mm / min with tilt angle tool at 3 degree and straight cylindrical tool pin. The factors of welding were rotating speed rates at 1320, 1750 rpm and heat treatment conditions. They were divided into (1) As welded (AW) joints, (2) T6 Weld (TW) joints, (3) Weld T6 (WT) joints, (4) T6 Weld T6 (TWT) joints, (5) Solution treated Weld Artificially aged (SWA) joints and (6) Weld Artificially aged (WA) joints. Rotating speed and heat treatment (T6) condition were an important factor to micro, macro structure of metal and mechanical properties of the weld. Increasing rotating speed and different heat treatment condition impacted onto tensile strength due to the defects on joints. Therefore the optimum welding parameter on joint was a rotating speed 1320 rpm, the welding speed 160 mm/min, heat treatment condition of Weld T6 (WT) which obtained the highest tensile strength 228.92 MPa, as well as, highest hardness of 98.1 HV

APA, Harvard, Vancouver, ISO, and other styles

42

Sim, Bernard-Maxmillan, Tang-Sai Hong, Mohamed Arif-Azmah Hanim, Edwin-Jong Nyon Tchan, and Mahesh-Kumar Talari. "The Influence of Post Weld Heat Treatment Precipitation on Duplex Stainless Steels Weld Overlay towards Pitting Corrosion." Materials 12, no. 20 (October 10, 2019): 3285. http://dx.doi.org/10.3390/ma12203285.

Full text

Abstract:

Duplex stainless steels (DSSs) are complex materials and they have been widely used in the marine environment and gas industries, primarily offering a better resistance of pitting corrosion and good mechanical properties. In the present work, the effects of heat treatment on duplex stainless steel (DSS) weld overlay samples that were heat treated at three different temperatures, namely 350 °C, 650 °C, and 1050 °C, and followed by air cooling and water quenching were studied. Stress relief temperature at 650 °C had induced sigma phase precipitation in between delta ferrite and austenite (δ/γ) grain boundaries, resulting in the loss of corrosion resistance in the weld metal. Interestingly, post weld heat treatment (PWHT) test samples that were reheated to solution annealing temperature had shown no weight loss. The ferrite count determination in the region of weld metal overlay increased at hydrogen relief and decreased at stress relief temperatures due to slow cooling, which is more favorable to austenite formation. The amount of ferrite in the weld metals was significantly reduced with the increment of solution anneal temperature to 1050 °C because of sufficient time for the formation of austenite and giving optimum equilibrium fraction in the welds.

APA, Harvard, Vancouver, ISO, and other styles

43

Peasura, Prachya, and Bovornchok Poopat. "Effect of Post Weld Heat Treatment on Fusion and Heat Affected Zone Microstructure and Mechanical Properties of Inconel X-750 Welds." Advanced Materials Research 214 (February 2011): 108–12. http://dx.doi.org/10.4028/www.scientific.net/amr.214.108.

Full text

Abstract:

The Inconel X-750 indicates good hot corrosion resistance, high stability and strength at high temperatures and for this reason the alloy is used in manufacturing of gas turbine hot components. The objective of this research was study the effect of post weld heat treatment (PWHT) on fusion zone and heat affected zone microstructure and mechanical properties of Inconel X-750 weld. After welding, samples were solutionized at 1500 0C. Various aging temperature and times were studied. The results show that aging temperature and time during PWHT can greatly affect microstructure and hardness in fusion zone and heat affected zone. As high aging temperature was used, the grain size also increased and M23C6 at the grain boundary decreased. This can result in decreased of hardness. Moreover excessive aging temperature can result in increasing MC carbide intensity in parent phase (austenite). It can also be observed that M23C6 at the grain boundary decreased due to high aging temperature. This resulted in decreasing of hardness of weld metal and heat affected zone. Experimental results showed that the aging temperature 705 0C aging time of 24 hours provided smaller grain size, suitable size and intensity of MC carbide resulting in higher hardness both in weld metal and HAZ.

APA, Harvard, Vancouver, ISO, and other styles

44

Sondel, Martin, Jaroslav Koukal, David Schwarz, and Drahomir Schwarz. "Evaluation of Secondary Hardening and Microstructure in the Real T24 Steel Weld Joint." Advanced Materials Research 1111 (July 2015): 151–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1111.151.

Full text

Abstract:

Development of new steels with higher creep resistance must be based on detailed knowledge of strengthening and degradation processes, structural stability at high temperature exposure and their welding. This paper is concerned with the real weld joint hardness and microstructure of progressive low alloy creep resistance T24 steel. These steel is widely used in many power-plant constructions all over the Europe. Welding the T24 steels components is one of the most important technological procedures. The aim of the performed investigation is to evaluate the hardness and microstructure in the heat affected zone (HAZ) and the weld metal. Results of the secondary hardening in the real weld joints after low temperature post weld heat treatment (460°C/48h) and without post weld heat treatment at service temperature are described in this paper. Obtained results are compared to the hardness values of the weld joint post weld heat treated at recommended temperature (740°C). The microstructure of the real weld joints was analysed by transmission electron microscopy (TEM) in order to identify minority phases - MX nanoparticles and/or coarse (M23C6) particles. Secondary hardening of the not heat treated and low temperature heat treated T24 weld joint was proved.

APA, Harvard, Vancouver, ISO, and other styles

45

Sparkes, D. J., N. Bailey, and T. G. Gooch. "Effect of post-weld heat treatment on heat affected zone microstructures of microalloyed C–Mn submerged arc welds." Materials Science and Technology 6, no. 12 (December 1990): 1215–26. http://dx.doi.org/10.1179/mst.1990.6.12.1215.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

UDAGAWA, Makoto, Jinya KATSUYAMA, Hiroyuki NISHIKAWA, and Kunio ONIZAWA. "Evaluation of Residual stress near the Weld Overlay Cladding by Welding and Post-Weld Heat Treatment." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 28, no. 3 (2010): 261–71. http://dx.doi.org/10.2207/qjjws.28.261.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Guo, J., X. Xu, Mark A. E. Jepson, and R. C. Thomson. "Influence of weld thermal cycle and post weld heat treatment on the microstructure of MarBN steel." International Journal of Pressure Vessels and Piping 174 (July 2019): 13–24. http://dx.doi.org/10.1016/j.ijpvp.2019.05.010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Makoto, Udagawa, Katsuya Jinya, Nishikawa Hiroyuki, and Onizawa Kunio. "Evaluation of residual stress near the weld overlay cladding by welding and post-weld heat treatment." Welding International 28, no. 7 (March 19, 2013): 521–34. http://dx.doi.org/10.1080/09507116.2012.753238.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Cao, X. Y., P. Zhu, T. G. Liu, Y. H. Lu, and T. Shoji. "Microstructure and electrochemical behavior of stainless steel weld overlay cladding exposed to post weld heat treatment." Journal of Materials Research 32, no. 4 (January 30, 2017): 852–62. http://dx.doi.org/10.1557/jmr.2016.526.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Pardowska, Anna M., John W. H. Price, Trevor R. Finlayson, and R. Ibrahim. "Evaluation of Residual Stress Measurements Before and After Post-Weld Heat Treatment in the Weld Repairs." Journal of Physics: Conference Series 251 (November 1, 2010): 012050. http://dx.doi.org/10.1088/1742-6596/251/1/012050.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Post weld heat treatment'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles