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Relevant bibliographies by topics / Gas metal arc welding

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Academic literature on the topic 'Gas metal arc welding'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2024

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Journal articles on the topic "Gas metal arc welding"

1

Hafez, Khalid M., Mohamed Mosalam Ghanem, Hamed A. Abdel-Aleem, and Naglaa Fathy. "Effect of Welding Processes on Mechanical and Microstructural Characteristics of DP780 Steel Welded Joints for the Automotive Industry." Key Engineering Materials 835 (March 2020): 101–7. http://dx.doi.org/10.4028/www.scientific.net/kem.835.101.

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Arc welding processes are widely used in the automotive industry among other welding processes. Consequently, laser welding technology is being used instead of arc welding due to the rapid heating and cooling characteristics of the laser. In this study, empirical investigations and comparative study are held out on the arc and laser beam welded joints of DP780 dual-phase steel. Accordingly, weld joint microstructures, hardness distribution, and fatigue properties cross the butt-welded joints were investigated. The results showed that laser beam welding produces narrow fusion and heat-affected zones while gas metal arc welding produced wide welds with incomplete penetration. It was observed that the microstructure of the laser joint weld metal has mainly lath martensite in the ferritic matrix, while microstructure of gas metal arc weld metal relies upon filler type. Heat-affected zone in DP780 steel exhibit hardness softening in both laser beam welding and gas metal arc welding due to martensite tempering, a wider softening region was clearly observed in heat-affected zone welded by gas metal arc welding than laser beam welding. Generally, fatigue ratio, fatigue limit and fatigue life of the welded joints were improved by using laser welding.

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HIRATA, Yoshinori. "Gas shielded Metal Arc Welding." JOURNAL OF THE JAPAN WELDING SOCIETY 77, no. 4 (2008): 296–303. http://dx.doi.org/10.2207/jjws.77.296.

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Pocica, Anna. "Gas-Shielded Metal Arc Welding." Biuletyn Instytutu Spawalnictwa 2019, no. 4 (2019): 47–58. http://dx.doi.org/10.17729/ebis.2019.4/5.

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Chae, H.-B., C.-H. Kim, J.-H. Kim, and S. Rhee. "The effect of shielding gas composition in CO2 laser—gas metal arc hybrid welding." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 222, no. 11 (November 1, 2008): 1315–24. http://dx.doi.org/10.1243/09544054jem944.

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In carbon dioxide (CO2) laser—gas metal arc hybrid welding, a shielding gas is supplied to isolate the molten metal from the ambient air, suppress the laser-induced plasma, remove the plume out of the keyhole, and stabilize the metal transfer. In this study, a shielding gas consisting of helium, argon, and CO2 was used, and its effects on the composition of the welding phenomena, such as behaviours of laser-induced plasma generation, molten pool flow, and droplet transfer in gas metal arc welding, were investigated. High-speed video observation was used to investigate the welding phenomena inside the arc regime. Consequently, helium was found to have a dominant role in suppressing laser-induced plasma; minimum helium content at a laser power of 8 kW was suggested for laser autogenous and hybrid welding. Argon and CO2 govern the droplet transfer and arc stability. A 12 per cent addition of CO2 stabilizes the metal transfer and eliminates undercut caused by insufficient wetting of molten metal.

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Ebrahimpour, Reza, Rasul Fesharakifard, and Seyed Mehdi Rezaei. "An adaptive approach to compensate seam tracking error in robotic welding process by a moving fixture." International Journal of Advanced Robotic Systems 15, no. 6 (November 1, 2018): 172988141881620. http://dx.doi.org/10.1177/1729881418816209.

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Welding is one of the most common method of connecting parts. Welding methods and processes are very diverse. Welding can be of fusion or solid state types. Arc welding, which is classified as fusion method, is the most widespread method of welding, and it involves many processes. In gas metal arc welding or metal inert gas–metal active gas, the protection of the molten weld pool is carried out by a shielding gas and the filler metal is in the form of wire which is automatically fed to the molten weld pool. As a semi-metallic arc process, the gas metal arc welding is a very good process for robotic welding. In this article, to conduct the metal active gas welding torch, an auxiliary ball screw servomechanism is proposed to move under a welder robot to track the welded seam. This servomechanism acts as a moving fixture and operates separately from the robot. At last, a decentralized control method based on adaptive sliding mode is designed and implemented on the fixture to provide the desired motion. Experimental results demonstrate an appropriate accuracy of seam tracking and error compensation by the proposed method.

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Yurtisik, Koray, Suha Tirkes, Igor Dykhno, C. Hakan Gur, and Riza Gurbuz. "Characterization of duplex stainless steel weld metals obtained by hybrid plasma-gas metal arc welding." Soldagem & Inspeção 18, no. 3 (September 2013): 207–16. http://dx.doi.org/10.1590/s0104-92242013000300003.

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Despite its high efficiency, autogenous keyhole welding is not well-accepted for duplex stainless steels because it causes excessive ferrite in as-welded duplex microstructure, which leads to a degradation in toughness and corrosion properties of the material. Combining the deep penetration characteristics of plasma arc welding in keyhole mode and metal deposition capability of gas metal arc welding, hybrid plasma - gas metal arc welding process has considered for providing a proper duplex microstructure without compromising the welding efficiency. 11.1 mm-thick standard duplex stainless steel plates were joined in a single-pass using this novel technique. Same plates were also subjected to conventional gas metal arc and plasma arc welding processes, providing benchmarks for the investigation of the weldability of the material. In the first place, the hybrid welding process enabled us to achieve less heat input compared to gas metal arc welding. Consequently, the precipitation of secondary phases, which are known to be detrimental to the toughness and corrosion resistance of duplex stainless steels, was significantly suppressed in both fusion and heat affected zones. Secondly, contrary to other keyhole techniques, proper cooling time and weld metal chemistry were achieved during the process, facilitating sufficient reconstructive transformation of austenite in the ferrite phase.

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Darakov, D. S., V. I. Vishnyakov, A. A. A. Ennan, and S. A. Kiro. "Fume emissions by electric arc during gas metal arc welding." Physics of Aerodisperse Systems, no. 60 (December 15, 2022): 120–42. http://dx.doi.org/10.18524/0367-1631.2022.60.267071.

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The influence of welding arc regime on the welding fumes formation is studied by numerical modeling via description of separate processes inside the space charge regions near electrodes in the welding arc with consumable electrode. The modeling comprises the calculation of temperature profiles for electrons and heavy component, calculation of space distribution of gas components’ number densities, of gas particles’ mean free pathes, of electric potential and field, calculation of the heat transfer from electrode wire (anode) to molten pool (cathode). The formation of high temperature metal vapor from molten pool to environment as a function of arc current is demonstrated. The nucleation in the plasma of welding fumes is considered with taken into account ionization of vapor atoms via their interaction with nucleus surface. The growth of nucleus droplets via vapor condensation and coalescence is calculated. The coagulation of solid primary particles for various values of welding current is calculated and inhalable particle size distribution is demonstrated.

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Mohan, Sreejith, S. P. Sivapirakasham, P. Bineesh, and K. K. Satpathy. "Strategies for Controlling Welding Fumes at the Source - A Review." Applied Mechanics and Materials 592-594 (July 2014): 2539–45. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2539.

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Exposure to welding fumes and its related hazards has always been a matter of serious concern. The mass and composition of fumes from welding depends on several factors. A detailed knowledge of these factors is necessary for understanding the mechanism of fume formation and developing suitable control strategies. This paper gives a literature overview on the various factors affecting welding fumes and strategies for controlling it. The paper focus on types of welding process like Manual Metal Arc Welding (MMAW) or Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), Flux Core Arc Welding (FCAW), Gas and Tungsten Arc Welding (GTAW). The research in the area of controlling fumes at the source has grown rapidly recently. Still, effective methods have hardly been explored. Improving arc stability by addition of materials with low ionization potential to the welding electrode lead to promising new research directions.

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Ren, Guochun, Pu Zhong, and Liangyu Li. "Modeling and simulation of arc dynamic behavior in Tri-Arc twin wire GMAW." Journal of Physics: Conference Series 2691, no. 1 (January 1, 2024): 012014. http://dx.doi.org/10.1088/1742-6596/2691/1/012014.

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Abstract The triple-arc (Tri-Arc) twin wire gas metal arc welding (GMAW) is an innovative approach to twin-wire welding. It establishes two arcs between the welding wires and the workpiece and introduces a third arc, called the “M arc” between the two wires. To theoretically analyze how various welding parameters affect this process, an equivalent circuit method is employed to establish a dynamic mathematical model for Tri-Arc twin wire gas metal arc welding. The welding process is characterized and simulated using MATLAB simulations to analyze variations in current signals and the wire stick-out. The results indicate that the main arc burns in a dynamic equilibrium state with periodic fluctuations, the current gradually decreases over time, and the arc is elongated. These simulation outcomes closely mirror real welding processes.

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Li, Kai, Hong Ming Gao, and Hai Chao Li. "Arc Behavior of Dry Hyperbaric Gas Metal Arc Welding." Advanced Materials Research 988 (July 2014): 245–48. http://dx.doi.org/10.4028/www.scientific.net/amr.988.245.

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The arc behavior in dry hyperbaric Gas Metal Arc Welding (GMAW) process was investigated by using a high speed camera system and welding electric signal acquisition system. The arc shape in hyperbaric argon environment of 0.1-2MPa shows quite different characteristic from that at normal pressure. With the increase of ambient pressure, the arc length turns shorter, arc column is contracted, and the arc brightness increases. At elevated ambient pressure, the arc length increases with increasing welding voltage. Arc voltage has a good linear relation with arc length. The sum of the fall voltages at ambient pressure of 0.4MPa, 0.8MPa, and 2MPa is nearly constant which is about 20.2-21.7V. The values of electric field strength of arc column at different ambient pressure were gained through the linear fit, which are increased with increasing ambient pressure. The arc static characteristics at elevated ambient pressure are raising characteristics, and it is shifted upward with increasing ambient pressure.

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Dissertations / Theses on the topic "Gas metal arc welding"

1

Kim, Yong-Seog. "Metal transfer in gas metal arc welding." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14199.

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Jönsson, Pär Göran. "Arc parameters and metal transfer in gas metal arc welding." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12470.

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Liratzis, Theocharis. "Tandem gas metal arc pipeline welding." Thesis, Cranfield University, 2007. http://dspace.lib.cranfield.ac.uk/handle/1826/5686.

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Energy consumption has grown by 2% per year worldwide over the past ten years. In 2005 worldwide 900,000 barrels of oil and 7.6 billion cubic metre of natural gas were produced daily. The exploitation of fields to meet the increased demands in energy requires the presence of adequate infrastructures. High strength pipeline steels(X100) have been developed to operate at higher pressures allowing a greater volume of fuel to be transported. Additional advantages arising from the reduction in wall thickness contribute to reduction in construction costs and steel volume.

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Talkington, John Eric. "Variable polarity gas metal arc welding." Connect to resource, 1998. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1130352747.

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Thesis (M.S.)--Ohio State University, 1998.
Advisor: Richard W. Richardson, Welding Engineering Program. Includes bibliographical references (leaves 111-113). Available online via OhioLINK's ETD Center

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Goodarzi, Massoud. "Mathematical modelling of gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27936.pdf.

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Jones, Lawrence Anthony. "Dynamic electrode forces in gas metal arc welding." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11287.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
Includes bibliographical references (p. 306-313).
by Lawrence Anthony Jones.
Ph.D.

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Wang, Ge. "NUMERICAL ANALYSIS OF METAL TRANSFER IN GAS METAL ARC WELDING." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/538.

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In gas metal arc welding (GMAW), metal transfer plays a crucial role in determining the quality of the resultant weld. In the present dissertation, a numerical model with advanced computational fluid dynamics (CFD) techniques has been developed first in order to provide better numerical results. It includes a two-step projection method for solving the incompressible fluid flow; a volume of fluid (VOF) method for capturing free surface; and a continuum surface force (CSF) model for calculating surface tension. The Gauss-type current density distribution is assumed as the boundary condition for the calculation of the electromagnetic force. The droplet profiles, electric potential and velocity distributions within the droplet are calculated and presented for different metal transfer modes. The analysis is conducted to find the most dominant effects influencing the metal transfer behavior. Comparisons between calculated results and experimental results for metal transfer under constant current are presented and show good agreement. Then, our numerical model is used to study a proposed modified pulsed current gas metal arc welding. This novel modified pulsed current GMAW is introduced to improve the robustness of the welding process in achieving a specific type of desirable and repeatable metal transfer mode, i.e., one drop per pulse (ODPP) mode. This new technology uses a peak current lower than the transition current to prevent accidental detachment and takes advantage of the downward momentum of the droplet oscillation to enhance the detachment. The calculations are conducted to demonstrate the effectiveness of the proposed method in achieving the desired metal transfer process in comparison with conventional pulsed current GMAW. Also, the critical conditions for effective utilization of this proposed method are identified by the numerical simulation. The welding operational parameters and their ranges are also calculated and the calculated results further demonstrate the robustness of this new GMAW technique in achieving high quality welding.

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Erener, Yavuz. "Analysis Of Welding Parameters In Gas Metal Arc Welding By A Welding Robot." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607766/index.pdf.

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ANALYSIS OF WELDING PARAMETERS IN GAS METAL ARC WELDING BY A WELDING ROBOT Erener, Yavuz M.S., Department of Mechanical Engineering Supervisor : Prof. Dr. R. Tuna Balkan Co-Supervisor : Prof. Dr. M. A. Sahir Arikan September 2006, 130 pages In Robotic Gas Metal Arc Welding process, the welding parameters controlled by the welder (travel speed of the welding torch, wire feed speed, current, voltage, wire diameter, etc.) should be considered to obtain a desired welding quality. To design an appropriate welding model for the used equipment, the effects of each parameter should be studied by carrying out an adequate number of experiments. The welding process is described by analyzing the experimental data to define the relationships between the welding parameters and process variables. Various regressional models can be suggested to establish the analytical relationships. In this study, the relationship between bead geometry and voltage, current, travel speed and wire feed speed is established by using a specific computer program developed for this purpose.

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Shen, Hao. "Seam position detection in pulsed gas metal arc welding." Access electronically, 2003. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20040823.125740/index.html.

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Ludick, Mark. "Experimental sensitivity analysis of welding parameters during transition from globular to spray metal transfer in gas metal arc welding." Thesis, Peninsula Technikon, 2001. http://hdl.handle.net/20.500.11838/1269.

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Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, Cape Town, 2001
Since the discovery of arc welding at the beginning ofthe century, metal transfer has been a topic ofresearch interest. Metal transfer can, in fact be related to weld quality, because it affects the arc stability. Furthermore, it determines the weld spatter, penetration, deposition rate and welding position. Gas Metal Arc Welding (also known as Metal Inert Gas- or MIG welding) is the most co=on method for arc welding steels and aluminurn alloys. Approximately 40% of the production welding in the country is accomplished by this process in which the thermal phenomena and melting ofthe solid electrode are coupled to the plasma arc and the weld pool. Thus the therrno- fluid behaviour of the electrode and detaching drops can have significant effects on the subsequent weld quality and production rate. The knowledge of how metal transfer affects this arc welding process is important for welding control and process automation, as well as in the development of improved welding consumables. Gas metal arc welding has a distinct feature, indicated by the results of Lesnewich [24], [23], that for most gases, there is a discrete metal droplet formation change between low and high current operations. Naturally the droplet size will have a significant influence on the properties ofthe welds. In globular transfer which occurs at low current, the welding electrode melts and produces large droplets (usually larger in diameter than the electrode wire diameter). This mode of transfer is associated with high spatter levels and thus undesirable in terms of welding economics. An increase in welding current will, for most welding! shielding gases, produce metal transfer with smaller droplets, which is termed spray transfer. This mode oftransfer is associated with high voltage and amperage settings, thus producing high deposition rates limited to the flaUhorizontal position.

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Books on the topic "Gas metal arc welding"

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Gas metal arc welding handbook. South Holland, Ill: Goodheart-Willcox, 1996.

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Company, Lincoln Electric, ed. Gas metal arc welding guide. Cleveland, Ohio, U.S.A: Lincoln Electric Co., 1986.

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Gas Metal Arc Welding Handbook. 5th ed. Tinley Park, IL, USA: The Goodheart-Willcox Co., 2008.

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Minnick, William H. Gas metal arc welding handbook. South Holland, Ill: Goodheart-Willcox, 1988.

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Gas metal arc welding handbook. South Holland, Ill: Goodheart-Willcox Co., 1991.

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International Pipe Trades Joint Training Committee. Gas tungsten arc welding. Washington, D.C: International Pipe Trades Joint Training Committee, 2000.

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Ghosh, Prakriti Kumar. Pulse Current Gas Metal Arc Welding. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3557-9.

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Gellerman, Mike. Practical gas metal and flux cored arc welding. Upper Saddle River, N.J: Prentice Hall, 1999.

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Novozhilov, N. M. Fundamental metallurgy of gas-shielded arc welding. New York: Gordon and Breach Science Publishers, 1988.

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1965-, Ozcelik Selahattin, and Moore Kevin L. 1960-, eds. Modeling, sensing and control of gas metal arc welding. Amsterdam: Elsvier, 2003.

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Book chapters on the topic "Gas metal arc welding"

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Dwivedi, Dheerendra Kumar. "Arc Welding Processes: Gas Tungsten Arc Welding: Principle and System Components." In Fundamentals of Metal Joining, 171–79. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4819-9_14.

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Dwivedi, Dheerendra Kumar. "Arc Welding Processes: Gas Tungsten Arc Welding: Electrode, Polarity and Pulse Variant." In Fundamentals of Metal Joining, 181–91. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4819-9_15.

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Dwivedi, Dheerendra Kumar. "Arc Welding Processes: Gas Metal Arc Welding: Principle, System, Parameters and Application." In Fundamentals of Metal Joining, 209–20. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4819-9_17.

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Ghosh, Prakriti Kumar. "Introduction to Gas Metal Arc Welding Process." In Materials Forming, Machining and Tribology, 1–30. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3557-9_1.

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Dwivedi, Dheerendra Kumar. "Arc Welding Processes: Gas Tungsten Arc Welding: Pulse Current, Hot Wire and Activated Flux-Assisted GTAW: Plasma Arc Welding: Principle, System, Application." In Fundamentals of Metal Joining, 193–207. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4819-9_16.

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Ghosh, Prakriti Kumar. "Erratum to: Pulse Current Gas Metal Arc Welding." In Materials Forming, Machining and Tribology, E1. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3557-9_10.

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Schubert, Emil. "Process Stability of Automated Gas Metal Arc Welding of Aluminium." In Robotic Welding, Intelligence and Automation, 1–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44415-2_1.

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Ghosh, Prakriti Kumar. "Concept of Pulse Current Gas Metal Arc Welding Process." In Materials Forming, Machining and Tribology, 31–45. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3557-9_2.

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Arulmurugan, B., P. Arunkumar, and S. Dharanikumar. "Advances in Gas Tungsten and Gas Metal Arc Welding – A Concise Review." In Advanced Joining Technologies, 18–36. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003327769-2.

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Wang, Wandong, Zhijiang Wang, Shengsun Hu, Yue Cao, and Shuangyang Zou. "Nonlinear Identification of Weld Penetration Control System in Pulsed Gas Metal Arc Welding." In Transactions on Intelligent Welding Manufacturing, 95–108. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7418-0_6.

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Conference papers on the topic "Gas metal arc welding"

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Hu, Junling, and Tai-Lung Tsai. "Effects of Welding Current in Gas Metal Arc Welding." In 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3584.

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Uddin, Emad, Usman Iqbal, Nabeel Arif, and Samiur Rehman Shah. "Analysis of metal transfer in gas metal arc welding." In CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114003.

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Nielsen, K. M., T. S. Pedersen, and S. K. Ovedahl. "Droplet Observer for Pulsed Gas Metal Arc Welding." In 2018 17th European Control Conference (ECC). IEEE, 2018. http://dx.doi.org/10.23919/ecc.2018.8550496.

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Anzehaee, Mohammad Mousavi, Mohammad Haeri, and Ali Reza Doodman Tipi. "Gas Metal Arc Welding process control based on arc length and arc voltage." In 2010 International Conference on Control, Automation and Systems (ICCAS 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccas.2010.5670302.

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Hu, J., and H. L. Tsai. "Modeling of Three-Dimensional Gas Metal Arc Welding With Groove." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41407.

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This article analyzes the dynamic process of groove filling and the resulting weld pool fluid flow in gas metal arc welding of thick metals with V-groove. Filler droplets carrying mass, momentum, thermal energy, and sulfur species are periodically impinged onto the workpiece. The complex transport phenomena in the weld pool, caused by the combined effect of droplet impingement, gravity, electromagnetic force, surface tension, and plasma arc pressure, were investigated to determine the transient weld pool shape and distributions of velocity, temperature, and sulfur species in the weld pool. It was found that the groove provides a channel which can smooth the flow in the weld pool, leading to poor mixing between the filler metal and the base metal, as compared to the case without a groove.

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Zhang, Y. M., E. Liguo, and B. L. Walcott. "Interval model based control of gas metal arc welding." In Proceedings of the 1998 American Control Conference (ACC). IEEE, 1998. http://dx.doi.org/10.1109/acc.1998.707307.

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Wu, Mingfei, and David Flynn. "An Advanced Gas Metal Arc Welding Machine Design for Low Spatter Welding." In 2018 IEEE 27th International Symposium on Industrial Electronics (ISIE). IEEE, 2018. http://dx.doi.org/10.1109/isie.2018.8433865.

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Zhou, Jun, Mohammad S. Davoud, and Hai-Lung Tsai. "Investigation of Transport Phenomena in Three-Dimensional Gas Metal Arc Welding of Thick Metals." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32686.

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Arc welding is generally used to join thick metals in many engineering applications. However, poor penetration often occurs due to arc heat diffusion into the base metal. Hence, arc welding of thick metals normally requires grooving and/or preheating of the base metal and sometimes requires multiple passes for very thick metals or metals with high conductivity, such as aluminum alloys. In gas metal arc welding of thick metals with grooves and preheating, complicated melt flow and heat transfer are caused by the combined effect of droplet impingement, gravity, electromagnetic force, surface tension, and plasma arc pressure. Understanding these complicated transport phenomena involved in the welding process is critical in improving the penetration depth and weld quality. In this study, mathematical models and associated numerical techniques have been developed to study the effects of grooves and preheating on melt flow, diffusion of species, and weld penetration in gas metal arc welding of thick metals. Complex melt flow, transient weld pool shape and distributions of temperature and species in the weld pool are calculated. The continuum formation is adopted to handle liquid region, mushy zone and solid region. VOF technique is used to handle transient deformed shape of weld pool surface. The preliminary results show both grooves and preheating have important effects on the melt flow in weld pool and the weld penetration. Computer animations showing the evolutions of temperature; melt flow; and the interaction between droplets and weld pool will be presented.

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Hu, J., H. L. Tsai, and P. C. Wang. "Effects of Welding Current on Metal Transfer and Weld Pool Dynamics in Gas Metal Arc Welding." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15617.

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In gas metal arc welding (GMAW), current is one of the most important factors affecting the mode of metal transfer and subsequently the weld quality. Recently, a new technology using pulsed currents has been employed to achieve the one droplet per pulse (ODPP) metal transfer mode with the advantages of low average currents, a stable and controllable droplet generation, and reduced spatter. In this paper, the comprehensive model recently developed by the authors was used to study the influences of different current profiles on the droplet formation, metal transfer, and weld pool dynamics in GMA, welding. Five types of welding currents were studied, including two constant currents and three waveform currents. In each type, the transient temperature and velocity distributions of the arc plasma and the molten metal, and the shapes of the droplet and the weld pool were calculated. The results showed that a higher electromagnetic force was generated at a higher current and becomes the dominant factor that detaches the droplet from the electrode tip. A smaller droplet size and a higher droplet frequency were obtained for a higher current. The model has demonstrated that a stable ODPP metal transfer mode can be achieved by choosing a current with proper waveform for given welding conditions.

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Deshang Sha and Xiaozhong Liao. "Digital control of double- pulsed gas metal arc welding machine." In 2009 IEEE 6th International Power Electronics and Motion Control Conference. IEEE, 2009. http://dx.doi.org/10.1109/ipemc.2009.5157839.

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Reports on the topic "Gas metal arc welding"

1

Siewert, Thomas A. Control of gas-metal-arc welding using arc-light sensing. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5037.

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2

Nixon, J. H. PR-171-419-R01 Pulsed Gas Metal Arc Welding. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), September 1986. http://dx.doi.org/10.55274/r0011699.

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3

Wodtke, C. H., D. R. Frizzell, and W. A. Plunkett. Manual gas tungsten arc (dc) and semiautomatic gas metal arc welding of 6XXX aluminum. Welding procedure specification. Office of Scientific and Technical Information (OSTI), August 1985. http://dx.doi.org/10.2172/5139192.

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Mornis, M. A., T. P. Quinn, T. A. Siewert, and J. P. H. Steele. Sensing of contact tube wear in gas metal arc welding. Gaithersburg, MD: National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.3996.

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5

Author, Unknown. L51610 Pulsed Gas Metal Arc Welding of API 5LX-80 Pipe. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), January 1989. http://dx.doi.org/10.55274/r0010413.

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This research program was undertaken to investigate the use of the pulsed- gas metal-arc welding (PGMAW) process for the field, girth welding of API 5LX-80 pipe. The specific program objectives were as follows: Determine the optimum shielding in gas, commercial filler wire, and weld procedure for the PGMA girth 5LX -80 pipe welding in the 5G position of API to determine the mechanical properties of PGMA girth welds deposited in five, API 5LX-80 pipes manufactured by different pipe mills. This report summarizes the materials, equipment, and procedures used, the results obtained, a discussion of these results, and conclusions. The PGMAW welding procedures that were developed are considered field-ready and can be used reliably for field, girth-welding operations.

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Kline-Schoder, Robert. Real-Time Robotic Control System for Titanium Gas Metal Arc Welding. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada429294.

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Kline-Schoder, Robert, and Nabil Elkouh. Real-Time Robotic Control System for Titanium Gas Metal Arc Welding. Fort Belvoir, VA: Defense Technical Information Center, July 2004. http://dx.doi.org/10.21236/ada429714.

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8

Morrison, K. G. PR-214-9109-R01 Application of Pulsed Gas Metal ARC Welding to Pipeline Construction. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 1992. http://dx.doi.org/10.55274/r0011832.

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Evaluates the use of high strength micro-alloyed steels in pipeline construction for the potential savings in material, materials handling, and welding construction costs. Pulsed- Gas Metal Arc Welding (P-GMAW) is considered the most appropriate welding process to join these materials since high quality, low hydrogen welds with excellent mechanical properties are possible.

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9

Ortega, A. R. A two-dimensional thermomechanical simulation of a gas metal arc welding process. Office of Scientific and Technical Information (OSTI), August 1990. http://dx.doi.org/10.2172/6768141.

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Fichtelberg, Neil D. Development of an Ultralight Pulse Gas Metal ARC Welding System for Shipyard Applications. Fort Belvoir, VA: Defense Technical Information Center, July 2007. http://dx.doi.org/10.21236/ada471032.

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