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Dissertations / Theses on the topic 'Welding'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

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 carr
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2

Bäck, Mimmi. "Welding of dissimilar metals in different welding positions." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-184241.

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The three boiling water reactors (BWR) in Oskarshamn produce about 10 % of the electrical power in Sweden. The combination of intense radiation fluxes and high temperatures in nuclear reactors creates an extraordinary environment. Therefore, a number of material challenges arise at a nuclear power plant that needs to be solved in order to maintain the nuclear power production, safety and reliability. Dissimilar metal welds can be found at a lot of places in nuclear power plants and due to reparations or replacement some dissimilar metal welds need to be welded on site. The technical regulation
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3

Melin, Timothy R. "Investigating Wood Welding Parameters Using a Prototype Welding Machine." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/420.

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Understanding how different processing variables influence wood welded bonds is vital if the technique will ever be used to create engineered lumber without using adhesives. A variation of vibration welding, wood welding uses pressure and friction to bond materials together. During welding, heat causes a softening in the wood, a naturally occurring composite material. This softening leads to fiber entanglement and a bond forms upon cooling. The goal of this research was to investigate several processing aspects of the wood welding procedure. A prototype wood welding machine, designed and f
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4

Tomás, Bruno Manuel Coelho. "Magnetic pulse welding." Master's thesis, Faculdade de Ciências e Tecnologia, 2010. http://hdl.handle.net/10362/4890.

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5

Weimann, David Herbert. "A study of welding procedure generation for submerged-arc welding process." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317488.

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6

Foote, W. J. "Welding C-Mn steels using the pulsed current MIG welding process." Thesis, Cranfield University, 1986. http://dspace.lib.cranfield.ac.uk/handle/1826/11111.

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The welding of C-Mn steels using the pulsed current MIG welding process was investigated. Following initial work on the basic fusion characteristics, the process was applied to the production of closed butt joint linepipe welding and narrow gap welding (in the flat and H-V positions). The initial stage of the work covered the determination of pulse parameters for controlled metal transfer with a variety of wires and shielding gases. Basic bead-on-plate fusion characteristics were investigated 1n all welding positions and quantified in terms of the major welding variables of current and travel
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7

Naseer-Ahmed. "Synergic control in MIG welding and penetration control in TIG welding." Thesis, London Metropolitan University, 1992. http://repository.londonmet.ac.uk/3451/.

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Part 1: Synergic control in MIG welding. Synergic controls (i.e. real time control methods) for both steady DC open arc and short circuiting arc operations have been developed in this study. These have been based on the generalised quadratic and linear ‘power-current' and linear ‘voltage-current’ equations which adequately describe the MIG welding operation. The controls are low coat electronic units which are added to a ‘transistor’ controlled power source. The units based on the ‘power-current’ concept can operate with the power source set in the constant current, constant voltage or any int
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8

Liu, Yukang. "Virtualized Welding Based Learning of Human Welder Behaviors for Intelligent Robotic Welding." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/51.

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Combining human welder (with intelligence and sensing versatility) and automated welding robots (with precision and consistency) can lead to next generation intelligent welding systems. In this dissertation intelligent welding robots are developed by process modeling / control method and learning the human welder behavior. Weld penetration and 3D weld pool surface are first accurately controlled for an automated Gas Tungsten Arc Welding (GTAW) machine. Closed-form model predictive control (MPC) algorithm is derived for real-time welding applications. Skilled welder response to 3D weld pool sur
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9

Yan, Pei. "High frequency induction welding & post-welding heat treatment of steel pipes." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609702.

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10

Aldén, Rickard. "Innovative Methods for Welding Ultra High Strength Steel with Resistance Spot Welding." Thesis, KTH, Industriell produktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245224.

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Resistance spot welding (RSW) is the most frequently used method for welding thin sheets in manufacturing industries such as the automotive industry, because of the high productivity of RSW. In order to reduce CO2 emissions the automotive industry strives towards creating structures of light weight, this is partly achieved by the use of lightweight materials such as Aluminum and composite materials. In parts of the car body designed to protect the driver and passengers in case of a collision High strength steel is used due to its high strength and relative high ductility. High strength steels
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11

Hudson, Mark G. "Welding of X100 linepipe." Thesis, Cranfield University, 2004. http://dspace.lib.cranfield.ac.uk/handle/1826/3404.

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The benefits of high strength steels in terms of reduced material volume due to enhanced mechanical performance have been known for some time. Large diameter transmission linepipe steels of minimum 690MPa ('X1OO') yield strength have been developed throughout the previous decade, and have recently become commercially available. Before these steels are used in linepipe construction projects, fimdamental work regarding their ability to be field welded required undertaking. This thesis presents data arising from girth welding experiments involving a variety of X 100 linepipe steels, welding consu
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12

Slater, Geoffrey Reginald. "Welding fume plume dispersion." Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20050307.120815/index.html.

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13

Harvey, M. T. "Laser welding of steels." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603824.

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One of the aims of the study has been the evaluation of suitable wires for welding API-X80 and En8 grade steels, on the basis of experimental results. The experimental results (from Charpy, CTOD and tensile testing together with general microscopy) were obtained using commercially available flux and metal cored wires. Weld metal tensile properties similar to those of the parent metal were obtained, although the fracture properties were generally inferior. An exception to this was shown by the En8 steel welded with a high nickel content wire which exhibited toughness values greater than those r
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14

Akbari, Mousavi A. A. "Mechanics of explosive welding." Thesis, University of Manchester, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525492.

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Explosive impact welding is a process to produce bi-metallic plates and tubes. Whilst well established it has been essentially an empirical process. This thesis describes work carried out to numerically analyse the two plates welding process. Using finite element and finite difference engineering packages, most aspects of the explosive welding process are modelled. A notable advance is the inclusion of a 'Williamsburg' type equation of state for various mixtures of the low speed ANFO explosives used by most commercial explosive welding companies. The numerical simulations showed that the level
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15

Maqbool, Saima. "Neural networksfor welding systems." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399817.

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16

Jilabi, Abdulsameea. "Welding of rail steels." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/welding-of-rail-steels(b9d907ef-45fc-4649-8c2f-9239a121abe0).html.

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The worldwide preferred method for rail joining is welding; flash butt welding (FBW) and thermite welding (TW) are the two main welding methods used for joining continuous welded rail (CWR) tracks. However, the welds still represent a discontinuity in the track structure due to variations in microstructure, mechanical properties and residual stress levels with respect to the parent rail. These variations can play significant roles in increasing the risk of weld failure under service conditions. In order to better understand how FBW parameters affect these variations, the two main parameters; n
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17

Pressl, Daniel G. (Daniel Gerd). "Investigation of electromagnetic welding." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53253.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>We propose several methodologies to study and optimize the electromagnetic process for Electromagnetic Forming (EMF) and Welding (EMW), thereby lowering the necessary process energy up to a factor of three and lengthening the life-time of EMW compression coils. We present a new theoretical approach to calculate a so-called critical kinetic energy to achieve a proper EMW joint, which is related to the volume
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18

Chan, Kwok Hung Billy Carleton University Dissertation Engineering Mechanical. "Software for welding engineers." Ottawa, 1990.

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19

Raza, Syed Farhan. "Ultrasonic welding of thermoplastics." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11424/.

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Ultrasonic welding (UW) is not only a well-known industrial process but it has also been an active research area. Materials ranging from metals to non-metals e.g. polymers and from virgin materials to non-virgin materials e.g. composites are easily welded using this welding technique. Some research has already been carried out but more thorough analysis is needed on ultrasonic welding of thermoplastics. Two thermoplastics selected for this research are commercially known as Acrylo-nitrile-Butadiene Styrene (ABS) and Polypropylene (PP). ABS belongs to amorphous type of thermoplastic, whereas PP
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20

Williams, Rebecca T. "Particles in Welding Fumes." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7382.

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The purpose of this study was to investigate whether or not differing base metals and filler wires used during welding processes contributed to differing amounts of ultrafine particles (UFP) and nanoparticles being emitted during the welding procedure. The study was also conducted to determine UFP and nanoparticle exposure in the breathing zones of the welders as well as the breathing zones of pipefitters and fire watchers, who commonly sit 6ft behind the welding arc. In order to determine if UFP and NP exposures differed with base metal and filler wire, all welding processes utilized the same
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21

Altenkirch, Jens. "Stress engineering of friction stir welding : measurement and control of welding residual stresses." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505389.

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Friction stir welding (FSW) is a maturing welding technique using a rotating tool for simultaneous heating and stir deforming th~ material interface to form a solid bond. Significant tensile residual stresses (RS) and component distortion may be produced even with optimized FSW parameters. Recent stress engineering techniques such as global mechanical or roller tensioning may reduce tensile RS and distortion. This dissertation reports on the first systematic investigation into the efficiency of insitu global mechanical tensioning (IS GMT) as well as roller tensioning applied in-situ (ISRT) and
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22

Coelho, Rodrigo Santiago. "Joining of light-weight materials by friction stir welding and laser beam welding." Berlin Bochum Dülmen London Paris Europ. Univ.-Verl, 2008. http://d-nb.info/994359489/04.

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23

Trautmann, Andreas. "Bifocal hybrid laser welding : a technology for welding of aluminium and zinc-coated steels /." München : Utz, 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9783831608768.

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24

Philander, Oscar. "Mathematical modelling of welding : sensitivity of residual stresses and thermal dilatations on welding parameters." Thesis, Peninsula Technikon, 1998. http://hdl.handle.net/20.500.11838/2227.

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Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 1998.<br>In South Africa, the determination of residual stress distribution and undesirable metallurgical phase fractions that are formed in components during welding are been dealt with in a destructive or semi-destructive manner. This dissertation is an attempt at enhancing the acquisition of residual components found in welded structures. It shows how finite element methods can be used to obtain these results. TIG welding is modeled as a thermo-mechano-metallurgical (TMM) problem. The mathematical and finite element models
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25

Abu, Bakar Nooh. "ESWELPD : an expert system for the generation of welding procedure of arc welding processes." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/33209.

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The research is focused on the development of an expert system to generate welding procedures for arc welding processes. The system has been developed on an IBM AT microcomputer, using an expert system shell KES (Knowledge Engineering System), a product of Software Architecture & Engineering Inc. The system is primarily intended for novice users, hence good 'help' facilities and graphical representations are provided in the system.
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26

Trautmann, Andreas. "Bifocal hybrid laser welding a technology for welding of aluminium and zinc-coated steels." München Utz, 2008. http://d-nb.info/992520797/04.

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27

Colegrove, Paul Andrew. "Modelling of friction stir welding." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/240576.

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This thesis investigates the modelling of friction stir welding (FSW). FSW is a relatively new welding process where a rotating non-consumable tool is used to join two materials through high temperature deformation. The aim of the thesis is the development of a numerical model to improve process understanding and to assist in the design of new tools. The early part of the thesis describes the process, defines the modelling problem and describes why a computational fluid dynamics package (FLUENT) was selected for the subsequent work. A systematic series of friction stir welding experiments in 7
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28

Forsman, Tomas. "Laser welding of aluminium alloys /." Luleå, 2000. http://epubl.luth.se/1402-1544/2000/39/index.html.

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29

Graaf, Menno Wouter de. "Sensor-guided robotic laser welding." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/58092.

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30

Vairis, Achilles. "High frequency linear friction welding." Thesis, Online version, 1997. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.389136.

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31

Yoon, Jong Won. "Laser welding of aluminium alloys." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343303.

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32

Haunton, Jan. "Butt fusion welding of polyethylene." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332077.

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33

Franche, Candonino P., Yogendra Joshi, and Pradip Dutta. "Determination of GTA welding efficiencies." Thesis, Monterey, California: Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24149.

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34

Shannon, Geoff. "Laser welding of sheet steel." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240883.

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35

Ovington, Stephen. "Fusion welding of crosslinked polyethylene." Thesis, University of Sunderland, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297127.

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36

Segar, Richard William Moore. "Activated tungsten inert gas welding." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621314.

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37

Albrecht, Mirko, and Michael Gehde. "Welding of incompatible thermoplastic polymers." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-204024.

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Due to the wide range of properties of plastics (e.g. low density), more and more conventional materials are substituted by polymer materials. Complex requirement profiles on technical parts increase the demand for joining processes that enable the reliable joining of otherwise incompatible thermoplastics. In this case, material bonded connections are approaching their limits. In the following study two incompatible thermoplastic polymers were welded by using polymer blends that are compatible to both components. Industrially relevant thermoplastics polyethylene (PE) and polyamide 12 (PA12) we
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38

Rashid, Lezan. "Overlay welding of FeCrAl alloys." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-44345.

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In this master thesis different overlay welding methods suitable for boiler application has been investigated. The purpose of this project is to define advantages and disadvantages for each overlay welding methods and suggest some evaluation criteria on some commercial and experimental alloys aimed for overlay welding material. Many components in a boiler are made of low alloy steel and the atmosphere in the furnace region can be very complex; therefore many different types of corrosion can occur. Weld overlay is a process where one or multiple layers of corrosion resistant material are applie
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39

Wikander, Lars. "Efficient thermomechanical modelling of welding." Doctoral thesis, Luleå tekniska universitet, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25709.

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This thesis deals with the pursuit of simple and efficient models for the prediction of welding residual deformation and stress, in particular ways to reduce the computational effort spent on the analysis. In the first part of the thesis, finite element models which reduce the number of degrees of freedom and thereby the execution time are presented. Using the model developed, a more complicated constitutive behaviour of the material can be described. A simplified method for the determination of deformation due to the welding of a flange onto a pipe is developed. The method is intended to aid
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40

Shao, Haiping. "Blank welding high-strength steels /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu148820385724983.

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41

Cortés, García Daniel, and González Álvaro Ruiz. "Laser welding machine specification research." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17606.

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This paper presents the technical specification of a laser welding machine, which main purpose is the weld of thin aluminium sheets. With the application of laser machines in automotive, aerospace, and other industries, it has become of crucial importance for a company working in those fields to keep updated with the technological progress. In this thesis, a deep research in laser machines and its applications has been done. The primary objective of this thesis is to gather knowledge about laser machines to help our client to find the machines they need. Among the several types of machines, th
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42

Stephen, Michael George. "Development and analysis of a friction stir spot welding process for aluminium." Thesis, Nelson Mandela Metropolitan University, 2005. http://hdl.handle.net/10948/1351.

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Friction Stir Spot Welding (FSSW) has been developed from the conventional Friction Stir Welding (FSW) process, developed at The Welding Institute (TWI). FSSWs have been done without the keyhole being eliminated. Elimination of the keyhole would result in the process being more commercially viable. This dissertation focuses on an attempt of eliminating the keyhole using a retractable pin tool as well as a comparison of the weld integrity of a FSSW to that of a conventional Resistance Spot Weld (RSW). Welds were conducted on aluminium alloy 6063 T4. Comparisons between different weld procedures
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43

Oyedemi, Kayode. "Increasing the gap tolerance in friction stir welded joints of AA6082-T6." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1012325.

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This research project was conducted to increase weld gap tolerance in Friction Stir Welding (FSW) of 8 mm thick aluminum alloy 6082 – T6. Investigation was done on I-STIR PDS platform and a Johnford milling machine. The research project involved tool-pin design with varying re-entrant features and varying parameters as a method of weld gap closing to produce successful welds. Direction of spindle rotation and dwell time were established as part of a preliminary study. Clockwise spindle rotation with 20 seconds dwell time allows sufficient plasticity and improved material flow which assisted in
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44

Tolf, Erik. "Challenges in Resistance Welding of Ultra High Strength Steels." Licentiate thesis, KTH, Svetsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167985.

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Increasing the use of Ultra High Strength Steels (UHSS) in vehicle bodystructures is important for reducing weight and cutting CO2 emissions. This thesis investigates challenges in resistance welding that can be a barrier to implementing UHSS as a replacement for low strength steels in vehicle structures. Empirical research has been performed to offer new approaches for improved joint strength and to increase knowledge on cracking mechanisms in resistance projection welding and resistance spot welding of UHSS. By optimising the current build-up phase and peak current during the first milliseco
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45

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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46

Andersson, Stefan. "Analysis of welding in comparable steel grades : Influence of steel grade on the welding process." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-33714.

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This master thesis is written to examine the influence of different low carbon steel sheet materials on the GMAW welding process. During welding the properties of the base material influence the productivity of the welding process. The purpose of this thesis is to examine how the choice of material and welding speed affect the welding process and the productivity. A literature survey was performed to describe the welding technique and the differences in manufacturing for the sheet materials as well as the effect of alloying and welding on the sheet material. Defects in the weld and methods use
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47

de, Vries Edgar. "Mechanics and mechanisms of ultrasonic metal welding." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1078415529.

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48

Van, Zyl Carlo Angelo Antonio. "Analysis and modelling of the temperature distribution during the friction taper stud welding of 10CrMo910." Thesis, Nelson Mandela Metropolitan University, 2008. http://hdl.handle.net/10948/720.

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Heat generation during the FTSW process plays and important role in determining the characteristics of the weld. In order to obtain temperature fields, a transient temperature heat analysis is required. An area is the maximum temperatures reached within the base material during the FTSW process. These temperatures will be measured during experimentation, and compared to the welding simulation done using FEA. From the literature search it appeared that no heat transfer analysis had been done using finite element methods.
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49

Maqueira, Benigno. "Robotic seam tracking of weld joints through the use of an ultrasonic sensor : system development and implementation." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/15839.

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50

Lambert, Russell. "Signal processing and shielding of ultrasonic echoes for automated welding control." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/16000.

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