Method of pulsed consumable-electrode gas-shield arc welding

摘要

In consumable-electrode gas-shield arc welding, carbon dioxide gas (G) is used as shield gas; the molten pool (M) is formed using a pulsed arc as a leading electrode (6a) arc transferring one droplet per cycle by alternately outputting, in each cycle, pulses of two different pulse waveforms of which a pulse peak current level and/or a pulse width per period differ; the conductively heated filler wire (6b) is inserted into the molten pool (M) as a trailing electrode; the distance between a tip (P1) of the filler wire (6b) inserted into the molten pool (M) and a conductive point (P2) of the filler wire (6b) is set within a range of 200×10 -3 to 500×10 -3 m; and a leading-electrode (6a) base current value is set larger than a trailing-electrode (6b) filler current value. According to such a method, even when inexpensive carbon dioxide gas is used as shield gas, the amount of spatter can be reduced, and high weldability can be achieved in multipass welding.