| 摘要 |
PROBLEM TO BE SOLVED: To optimize penetration and a bead shape of an arc start part in two-electrode arc welding. SOLUTION: In a method for controlling arc start for two-electrode arc welding performing arc welding using a welding torch WT equipped with a consumable electrode 1a and a non-consumable electrode 1b, a consumable electrode arc 3a is generated between the consumable electrode 1a and a base material 2. Then, the consumable electrode 1a is fed at a normal feeding speed, a non-consumable electrode arc 3b is generated between the non-consumable electrode 1b and the base material 2. Thereafter, during a preheating period, a preheating current having a larger value than a normal current value is made to flow to the non-consumable electrode arc 3b, a feeding speed is switched to a preheating feeding speed that is faster than the normal feeding speed in accordance with the preheating current value. Upon completion of the preheating period, the feeding speed is switched to the normal feeding speed and, simultaneously, the current value for energizing the non-consumable electrode arc 3b is switched to the normal current value and made to shift to the normal welding state. COPYRIGHT: (C)2010,JPO&INPIT |
