脉冲等离子-MIG复合焊熔滴过渡行为研究

将脉冲等离子电弧与MIG电弧同轴复合,期望利用等离子弧脉冲峰值电流产生的高速等离子射流冲击熔滴和熔池,促进熔滴过渡,同时增加焊缝熔深。开发了一套高速视觉与电信号精确同步的焊接数据采集系统,对脉冲等离子-MIG复合焊熔滴过渡行为进行研究。研究发现将等离子电流调制成脉冲波形,等离子弧对工件总体热输入下降,等离子峰值电流产生的等离子流力可以有效促进熔滴过渡。在此基础上深入分析了等离子脉冲峰值电流、脉冲宽度及熔滴在等离子弧过渡位置等参数对熔滴过渡的影响,获得了脉冲等离子-MIG复合焊一脉一滴过渡的工艺参数窗口。

Droplet transfer behavior in Pulsed Plasma-MIG welding

The coaxially compound pulsed plasma arc with MIG arc was proposed to utilize the high-speed plasma jet to impact the arc and weld pool. Thus both the metal transfer and weld depth can be promoted. A data acquisition system that synchronizing the high-speed camera and arc variables was developed to precisely analyze the droplet transfer of Pulsed Plasma-MIG hybrid welding. Experimental results indicated that the plasma arc current was adjusted to be pulse, which can be contributed to reduce the welding input and enhance the droplet transfer effectively. Furthermore, the effects of plasma peak current, width and droplet transfer position in the plasma arc on the droplet transfer were analyzed respectively, and the one droplet per pulse mode was obtained by adjusting the plasma arc parameters. The window of plasma pulse parameters for achieving one droplet per pulse transfer mode was thus determined.