| 摘要 |
PROBLEM TO BE SOLVED: To provide a plasma arc welding system suited for adjusting a region occupied by a high energy portion in a main arc.SOLUTION: A pilot arc power supply circuit 31 generates an outside nozzle energization period of flowing a pilot arc current between a non-consumable electrode 121 and an outside nozzle 123. A main arc power supply circuit 41 flows a main arc current Im between the non-consumable electrode 121 and a base material W during the outside nozzle energization period. The non-consumable electrode 121 includes a distal end 121a positioned on a first direction X1 side and has a shape extending along the first direction X1. The distal end 121a of the non-consumable electrode 121 is positioned at a first position L1 and a second position L2, which is on the first direction X1 side than the first position L1. An inside nozzle 122 is formed with an inside nozzle opening 122a, which inside nozzle opening 122a is positioned between the first position L1 and the second position L2 in the first direction X1. |
