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摘要:
The effect of the shielding gas composition and the cathode processing history on the weld formation quality during welding with a non-consumable electrode at high current was studied. The major reasons for pores,"waists"and undercuts formation during welding at high currents and speed are discrete melt movement to the solidification front due to the arc decline from the cathode axis and significant melt overhanging in the pool tail part caused by excessive peak pressure on the discharge axis. Cathode flow dispersion causes the lack of displacement of the molten metal which results in its laminar flow in the weld pool, uniform flow of the metal to the crystallization front and sound weld formation. The melt movement in the weld pool and eventually the welded joint quality is determined by the pressure distribu-tion pattern on the welded metal surface and the anode spot lag from the electrode. It was demonstrated that non-consumable electrode con-figurations that provide arcing with a diffuse cathode spot and increased helium concentration in the inert atmosphere during welding with a conical electrode allow sound weld formation.
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篇名 Influence of shielding gas and non-consumable electrode configuration on weld formation
来源期刊 中国焊接 学科
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年,卷(期) 2021,(4) 所属期刊栏目
研究方向 页码范围 17-24
页数 8页 分类号
字数 语种 英文
DOI 10.12073/j.cw.20210609003
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中国焊接
季刊
1004-5341
23-1332/TG
哈尔滨市南岗区和兴路111号
eng
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1017
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