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Effect of welding current and speed on occurrence of humping bead in high-speed GMAW

China Welding 2009年第2期18卷 35-40页

作者：陈姬武传松 Institute for Materials Joining Shandong University Jinan 250061

The developed mathematical model of humping formation mechanism in high-speed gas metal arc welding （GMAW） is used to analyze the effects of welding current and welding speed on the occurrence of humping bead. It considers both the momentum and heat content of backward flowing molten jet inside weld pool. Three-dimensional geometry of weld pool, the spacing between two adjacent humps and hump height along humping weld bead are calculated under different levels of welding current and welding speed. It shows that wire feeding rate, power intensity and the moment of backward flowing molten jet are the major factors on humping bead formation.

关键词： high-speed GMAW humping bead welding speed welding current

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Suppressing of humping bead using an external magnetic field in high-speed gas metal arc welding

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China Welding 2014年第2期23卷 22-28页

作者： Yang Fengzhao Wu Chuansong Gao Jinqiang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) and Institute for Materials Joining Shandong University Jinan 250061

During high-speed gas metal arc welding （GMAW）, the backward flowing molten jet with high momentum in the weld pool is considered to be responsible for the occurrence of humping bead. To suppress humping bead, an electromagnetic device is developed and coupled with the welding system. By adjusting the conditions of external magnetic field, forward electromagnetic force is obtained to reduce the momentum of the backward flow of molten metal in weld pool. Consequently, the humping bead can be suppressed by adjusting the external magnetic field. bead-on-plate welding experiment was conducted on mild steel plates, and the influence of magnetic flux density on the arc deflection angle and weld bead quality is investigated. It is found that external magnetic field can remarkably adjust the momentum of backward flow jet and significantly improve the quality of weld bead.

关键词： high-speed GMAW external magnetic field humping bead

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Experimental determination of the critical welding speed in high speed MAG welding

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China Welding 2008年第2期17卷 15-19页

作者：胡志坤武传松 Institute for Materials Joining Shandong University

In high speed MAG welding process, some weld formation defects may be encountered. To get good weld quality, the critical welding speed beyond which humping or undercutting weld bead can occur must be known for different conditions. In this research, high speed MAG welding tests were carried out to check out the effects of different factors on the critical welding speed. Through observing the weld bead profiles and the macrographs of the transverse sections of MAG welds, the occurrence tendency of humping weld was analyzed, and the values of critical welding speed were determined under different levels of welding current or voltage, and the effect of shielding gas compositions on the critical welding speed was also investigated.

关键词： high speed MAG welding humping bead critical welding speed

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