| 摘要 |
PURPOSE: To reduce generation of spatter and to improve welding efficiency by setting a droplet forming energy set value to a specific range in gas shielded pulse arc welding. CONSTITUTION: An output control method of power source for pulse arc welding, in which CO2 gas or a mixed gas containing CO2 as principal component is used for shield gas, is executed so that a first pulse period, in which a first pulse current is supplied for detaching droplet at the tip of welding wire and a second pulse period, in which at detecting that droplet is detached from the tip of welding wire during the first pulse period, in following the first pulse period, a second pulse current smaller than the first pulse current and for forming droplet is supplied up to reaching the droplet forming energy set value ER shown by 0.4K(IP2 )<=E<=0.8K, here K(IP2 ) is (pulse current value)×(pulse current supply time), subsequently, a base period to supply base current. These are repeated in sequence.
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