穿孔法变极性等离子立焊的收弧过程

Ending progress in vertical-up variant polarity plasma arc welding with keyhole

摘要: 研究了穿孔法等离子弧焊的收弧规律。发现焊接电流、离子气流量和焊接速度对收弧过程影响较大。在收弧阶段采用适当焊接电流,增大送丝速度,减小离子气流量和焊接速度,以增加焊接热输入,可以实现收弧弧坑的填充。对于不同厚度的铝合金,收弧阶段的规范参数有一最佳区间。研究了收弧坑的接头性能,其抗拉强度和伸长率均不低于中间焊缝。

Abstract: The regulation of ending progress in variant polarity plasma arc welding with keyhole was studied.The welding current,welding speed and the plasma gas flow rate were the most important parameters in the ending stage.The arc crater could be successfully filled by increasing wire feed speed,reducing ion gas flow rate as well as welding speed.The welding parameters in ending stage had their best ranges for material with different thickness.The weld mechanical properties of the joint at the end of the weld were not less than that at the middle of the weld.