Patent ID: 11931830
Assignee: KOBE STEEL, LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. A control apparatus configured for gas-shielded arc welding in which a welding current is controlled using, as a shielding gas, carbon dioxide gas having CO2 content of 100% by volume or a mixed gas having CO2 content of 30% by volume or more with the balance being Ar, the control apparatus configured to perform:
providing a normal arc period in which the welding current is maintained at a setting current Icc set in advance;
detecting a separation timing of a molten droplet at a welding wire tip melted by an arc; and
providing a separation control period after the separation timing of the molten droplet is detected in the normal arc period, the separation control period including a current decreasing section in which the welding current is decreased, a current maintaining section in which the welding current is maintained at a constant separation maintaining current Ih1 after the current decreasing section, and a current increasing section in which the welding current is increased after the current maintaining section,
wherein the separation control period, for preventing a short circuit, comprises
controlling an output voltage by maintaining the arc voltage during welding within ±10% with respect to the setting voltage.