LASER MACHINING APPARATUS

摘要

Oscillation of a laser oscillator is so controlled that arc discharge from a GMA electrode is caused after start of the oscillation of a laser beam (T2=T1+ DELTA T5) or simultaneously with the start ( DELTA T5=0) and that the oscillation is stopped after the arc discharge from the GMA electrode is stopped (T4= T3+ DELTA T6) or simultaneously with the stop( DELTA T6=0). A coaxial laser machining head is so constituted that a GMA electrode (33) is arranged coaxially with first and second split laser beams (24b, 24c) in a spatial region (24d) of the first and second split beams (24b, 24c) split by first and second reflecting mirror (27, 28). Alternatively, the GMA electrode (33) is arranged coaxially with a laser beam (24f) in a spatial region (24g) defined in the laser beam (24f) by talking out a part (24e) of the laser beam by first and a second reflecting mirrors (87, 88).