Plasma keyhole welding method and plasma keyhole welding equipment

摘要

PROBLEM TO BE SOLVED: To provide a plasma keyhole welding device capable of improving work efficiency, and also to provide a plasma keyhole welding method.;SOLUTION: The plasma keyhole welding device A1 starts welding by generating a plasma arc PA and forming a keyhole so as to pass through it. The plasma keyhole welding device A1 includes: an output control circuit 21 allowing an arc current Iw to flow with a normal current value in a normal welding state; an operation control circuit 31 for relatively moving a plasma electrode 112 relative to a material W to be welded at a normal speed Vp along the in-plane direction of the material W to be welded in the normal welding state; a time measurement circuit 23 for measuring a keyhole formation time required for passing through the keyhole when starting welding; and an arithmetic circuit OC for calculating at least one of the normal speed Vp and the normal current value based on the keyhole formation time. Optimum normal speed Vp or normal current value is calculated so that work efficiency of welding is improved.;COPYRIGHT: (C)2011,JPO&INPIT