Oblon, McClelland, Maier & Neustadt, L.L.P.
Consumable-electrode gas-shield arc welding method and consumable-electrode gas-shield arc welding system
In consumable-electrode gas-shield arc welding, carbon dioxide gas is used as shield gas; the molten pool is formed using a pulsed arc as a leading electrode 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 is inserted into the molten pool as a trailing electrode; the distance between a tip of the filler wire inserted into the molten pool and a conductive point of the filler wire is set within a range of 200×10−3 to 500×10−3 m; and a leading-electrode base current value is set larger than a trailing-electrode 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.
Kobe Steel, Ltd.
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B23K B23K B23K B23K B23K
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Reiichi Kei
Suzuki Yamazaki