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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 article, the effects of pulsed current welding on tensile properties, hardness profiles, microstructural features and residual stress distribution of aluminium alloy joints were reported, and it was found to improve the tensile property of the weld compared with continuous current welding due to grain refinement occurring in the fusion zone.

78 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of shielding gas compositions on transport phenomena in the metal are reported which include the transient processes of electrode melting; droplet formation, detachment, transfer and impingement onto the workpiece; weld pool dynamics and weld bead formation.

78 citations

Journal ArticleDOI
TL;DR: In this paper, a comparative study on the operating characteristics of gas-tungsten arc (GTA) welding for several types of electrodes was carried out with a pure tungsten electrode and with a small quantity of the rare earth metal oxides, La2O3, Y2O 3, CeO 2, and with ZrO2, ThO2 and MgO.
Abstract: A comparative study has been made on the operating characteristics of gas-tungsten arc (GTA) welding for several types of electrodes. The work was carried out with a pure tungsten electrode and tungsten electrodes activated with a small quantity of the rare earth metal oxides, La2O3, Y2O3, CeO2, and with ZrO2, ThO2, and MgO. Their behaviors during arcing were analyzed and compared from the points of view of arc starting characteristics, electrode consumption, change in shape due to long-term operation, and incompleteness of insert gas shielding and electrode temperature. The results indicated that W-La2O3 electrodes have superior characteristics among those tested. Metallographic studies of the electrodes indicate that the superiority of operating characteristics strongly depends on the behavior of the rare earth metal oxides during arc burning. It is observed that the rare earth metal oxides form tungstate or oxytungstate during arc burning. These newly formed compounds have low melting points and migrate from the low temperature zones to the high temperature zones throughout the electrode tip, while ThO2 reacts with tungsten, forming pure Th. Also, the investigation demonstrates good stability of La2O3 during arc burning compared with the other oxides. Particular attention was also paid to the electrode temperature measurement and the important phenomena concerning the emissivity of a particular surface as one of the thermal properties. The investigation reveals the effects of temperature and oxide distribution on the spectral emissivity of the electrode in addition to the main different effect of oxides added to tungsten. Observations of the cathode tip microstructure during and after arc burning were made, and important phenomena concerning the formation of a tungsten “rim” at the periphery of the cathode area, which governs the durability of the electrode and the stability of the arc, are discussed theoretically and experimentally based on the temperature measurement of the tip and the oxidation of tungsten.

78 citations

Journal ArticleDOI
TL;DR: In this article, a mathematical model is developed to describe the globular transfer in gas metal arc welding (GMAW) using the volume-of-fluid (VOF) method, and the fluid-flow and heat-transfer phenomena are dynamically studied during the following processes: droplet formation and detachment, impingement of a droplet on a solid substrate, impeding of multiple droplets on the molten pool, and solidification after the arc extinguishes.
Abstract: A mathematical model is developed to describe the globular transfer in gas metal arc welding (GMAW). This work is both theoretical and experimental. Using the volume-of-fluid (VOF) method, the fluid-flow and heat-transfer phenomena are dynamically studied during the following processes: droplet formation and detachment, impingement of a droplet on a solid substrate, impingement of multiple droplets on the molten pool, and solidification after the arc extinguishes. A He-Ne laser, in conjunction with the shadow graphing technique, is used to observe the metal transfer processes. Theoretical predictions and experimental results are in close agreement, suggesting that the theoretical treatment of the model is good.

78 citations

Journal ArticleDOI
TL;DR: In this article, the effect of process parameters on the bead geometry was investigated and a three factor, five level factorial design for 317L flux cored stainless steel wire with IS:2062 structural steel as base plate was developed.
Abstract: The mechanical and corrosion resistant properties of cladded components depend on the clad bead geometries, which in turn are controlled by the process parameters. Therefore it is essential to study the effect of process parameters on the bead geometry to enable effective control of these parameters. The above objective can easily be achieved by developing equations to predict the weld bead dimensions in terms of process parameters. Experiments were conducted to develop models, using a three factor, five level factorial design for 317L flux cored stainless steel wire with IS:2062 structural steel as base plate. The models so developed were checked for their adequacy. Confirmation experiments were also conducted and the results show that the models developed can predict the bead geometries and dilution with reasonable accuracy. It was observed from the investigation that the interactive effect of the process parameters on the bead geometry is significant and cannot be neglected.

77 citations


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