1979 Volume 48 Issue 7 Pages 488-493
Plasma arc welding with filler wire addition has been used for various purposes in industry. However, there have been few studies on metal transfer in plasma arc with filler wire.
This paper deals with the characteristics of the metal transfer mechanism of the filler wire in the plasma arc, and observation of the droplets transfer. The metal transfer was observed by high speed camera and the wirework voltage was recorded by oscillograph.
In case of plasma arc, the droplets transferred to the molten pool with a streaming transfer which was not observed in TIG arc. The liquid metal at the wire tip was bent downward by the plasma jet and transferred to the workpiece without contact to the molten pool.
As a result, plasma jet stream was found to be the main factor causing the streaming transfer.