Consumable-electrode gas-shield arc welding method and consumable-electrode gas-shield arc welding system

摘要

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.

主权项

1. A consumable-electrode gas-shield arc welding method comprising the steps of:
using carbon dioxide gas as shield gas; forming the molten pool using a pulsed arc at the consumable electrode wire as a leading electrode arc transferring one droplet per cycle, by alternately outputting pulses, one at a time in each cycle, of two different pulse waveforms having a base current value, of which at least one of a pulse peak current level and a pulse width per period differ for the two different pulse waveforms; inserting a filler wire as a trailing electrode into a molten pool formed by an arc generated at a consumable electrode wire, wherein the filler wire has been conductively heated by a filler current starting at a conductive point separate from the molten pool; setting the conductive distance Ex between a tip of the filler wire inserted into the molten pool and the conductive point of the filler current to the filler wire within a range of 200×10−3 to 500×10−3 m; and setting the trailing-electrode filler current value to a low value lower than the leading-electrode base current value, whereby spatter is reduced.