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

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.