等离子—熔化极气体保护焊电弧特性研究现状

State of study on arc characteristic during plasma-MIG welding process

等离子—熔化极气体保护焊的电弧形态和熔滴过渡方式直接关系到焊缝质量,采用不同的电极连接形式,如直流正接、直流反接,电弧形态及熔滴过渡方式均不同;主要介绍了目前等离子—熔化极气体保护焊在采用不同的电极连接形式下,不同的电弧形态和熔滴过渡方式,以及电弧成分组成和温度分布;通过对熔化极等离子弧静特性等方面的研究发现,熔化极电流的大小不是由焊丝与工件间的电压决定的,而是由导电嘴与焊丝端部处的等离子弧电位差决定的,并决定电流的方向。

The arc shape and metal transfer mode of Plasma-GMAW have direct relationship with quality of weld,using different forms of electrode connection,such as DCSP and DCRP,the arc shape and metal transfer modes are different.This paper mainly introduces the different arc shapes,metal transfer modes,compositions of arc and temperature distribution in plasma-GMAW with different electrode connection forms at present;by the research of static characteristics of metal plasma arc, it finds that metal current isn＇t decided by the voltage between wire and workpiece,but by the potentiometer of plasma arc between tip and wire end,and decides the current direction.