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Gas metal arc welding

About: Gas metal arc welding is a research topic. Over the lifetime, 11706 publications have been published within this topic receiving 109555 citations. The topic is also known as: metal active gas welding & GMAW.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the effects of welding parameters on welded joint geometry are determined and the effect of these parameters on welding joint geometry is analyzed in a controlled short-circuit gas metal arc welding (CS-GMAW).
Abstract: Control of welding parameters is an important factor in gas metal arc welding (GMAW) because these parameters determine the heat input, cooling conditions, and time during which the microstructure and the geometry of the weld are formed. It is therefore essential that sufficient heat is transferred to highly conductive metals like aluminum and appropriate heat input used with very sensitive metals such as stainless steel and high-strength steels or when welding dissimilar metals. The objective of this study is to identify parameters of current, voltage waveforms, and electrode feeding motion that directly contribute to improvement in metal and heat transfer conditions from the electrode to the base metals. The effects of these parameters on welded joint geometry are determined. The work critically reviews research on the effect on welded joints of control of current waveform, voltage, and the alternating electrode and analyzes the different parameters that promote forces acting during metal transfer. Experiments and case studies based on controlled waveforms are discussed. The analysis shows that in controlled short-circuit gas metal arc welding (CS-GMAW), all identified parameters contribute to control of heat input and reduction in the amount of spatter and fumes generated. Variable polarity gas metal arc welding (VP-GMAW) is found to be particularly effective for aluminum welding because of its good control of mass metal transfer and weld penetration. Mixed waveform approaches (i.e., 20 pulses/controlled short circuit) improve weldability in difficult welding positions.

32 citations

Patent
10 Aug 2009
TL;DR: In this paper, an electric arc welding device for performing a pulse welding process by a current between an advancing electrode and workpiece where the welder comprises a short detecting circuit for creating a short signal upon occurrence of a short circuit between the advancing electrodes and the workpiece and a boost circuit to create a plasma boost pulse after the short circuit is cleared during the time period when the weiner is not outputting the peak pulse current.
Abstract: An electric arc welding device for performing a pulse welding process by a current between an advancing electrode and workpiece where the welder comprises a short detecting circuit for creating a short signal upon occurrence of a short circuit between the advancing electrode and the workpiece and a boost circuit to create a plasma boost pulse after the short circuit is cleared during the time period when the welder is not outputting the peak pulse current. The peak pulse current to background current ratio is high and the duration of the peak pulse is short.

32 citations

Journal ArticleDOI
TL;DR: In this article, the conductive mechanism of arc ignition in laser assisted arc hybrid welding was investigated, and it was found that the plasma current moved to the arc anode under the action of electric field.

32 citations

Journal ArticleDOI
01 Sep 1987
TL;DR: In this article, the electrical characteristics of the tungsten/argon arc are considered, giving some attention to problems of arc reignition and stability, and to the means of assessing the suitability of power sources for welding operations.
Abstract: The electrical characteristics of the arc as used in welding technology are considered, giving some attention to problems of arc reignition and stability, and to the means of assessing the suitability of power sources for welding operations. The behaviour of thermionic and nonthermionic cathodes is reviewed and recent developments in the investigation of nonthermionic cathodes are described. Work on the arc column is divided into sections on properties and fluid dynamics, following which the behaviour of the column during welding is reviewed in relation to specific problems such as arc force, arc stiffness, magnetic effects and arc blow. A final section covers the anode, particularly in relation to the tungsten/argon arc and its use in the gas tungsten arc welding process.

32 citations

Journal ArticleDOI
TL;DR: A novel multidirectional WAAM process, using robotic gas metal arc welding, to additively manufacture metal components in multiple directions is presented and would significantly reduce the manufacturing time and cost.
Abstract: Robotic wire arc additive manufacturing (WAAM) for the fabrication of metallic parts is garnering interest due to its advantages of low capital investment, high deposition rates, and good material properties. Although many achievements have been made, the build direction of WAAM remains confined to the vertical-up direction, requiring additional supporting structure to be deposited while fabricating metallic parts with overhanging features. In this article, a novel multidirectional WAAM process, using robotic gas metal arc welding, to additively manufacture metal components in multiple directions is presented. Several novel modules, including positional bead modeling, multidirection slicing, and deposition process optimization of the deposition process, are highlights of this article. In addition, the performance of the proposed multidirectional WAAM strategy is evaluated by the successful deposition of a sample workpiece with complex geometrical features. The proposed multidirectional WAAM process would significantly reduce the manufacturing time and cost.

32 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023195
2022351
2021292
2020385
2019330
2018346