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Gas Pool Coupled Activating tig welding Method with Coupling Arc Electrode

Chinese Journal of Mechanical Engineering 2018年第6期31卷 169-176页

作者： Yong Huang Rui-Lin Liu Yan-Zhao Hao State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China Department of Aviation Manufacture Engineering Chengdu Aeronautic Polytechnic Chengdu 610100 China Technology Center Great Wall Motor Company Limited Baoding 071000 China

Gas pool coupled activating tig(gpca?tig) welding put forward in?house can dramatically enhance weld penetration of tig welding through introducing active element oxygen to reverse the Marangoni convection flow in the molten pool. In order to further improve the welding productivity, the normal solid tungsten electrode is replaced by a kind of coupling arc electrode. The changes of arc pressure distribution along anode surface and the weld appearance were evaluated. On this basis, the dependences of weld shape characterized with weld depth, width and undercut on the main welding parameters were discussed. The results indicate, the substitution of coupling arc electrode can lead to an obvious decrease of arc pressure. Compared to hollow tungsten electrode and twin tungsten electrodes, the coupling arc electrode is much easier to manufacture and has more compacter structure. Combined with the symmetric distribution of arc pressure in di erent directions, this electrode has extensive adaptability. In the gpca?tig welding with coupling arc electrode, both the substitution of coupling arc electrode and the introduction of outer active gas oxygen can reduce the possibilities of producing humping bead and undercut. Their joint action makes this welding method have the capability of realizing high travel speed and deep penetration welding.

关键词： gpca?tig welding Coupling arc electrode Oxygen Arc pressure Weld shape welding parameter

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