Patent ID: 8901454
Filing Date: 2014-12-02
Classification: B23K

Abstract:
1. A method for controlling pulse arc welding where an arc is created between a welding wire as a consumable electrode and a base material as an object to be welded, including performing a short circuit welding in a short-circuit welding period which starts either at a time when the start of welding is commanded or a time when the start of welding is commanded and a contact between the welding wire and the base material is detected, performing a first pulse arc welding having a first pulse repeated N times for welding current in a first pulse-welding period after the short-circuit welding period, where N is a predetermined integer number >1, and performing a second pulse arc welding having a second pulse repeated M times for welding current in a second pulse-welding period after the first pulse-welding period, where M>1, wherein each of the N first pulses for welding current comprises a common first rising slope and a common first falling slope, each of the M second pulses for welding current comprises a common second rising slope and a common second falling slope, and the common first rising slope is more gradual than the common second rising slope, or the common first falling slope is more gradual than the common second falling slope.