| 摘要 |
PURPOSE:To reduce swelling of a bead, and to smooth a bead joint, by thrusting in a torch, making it close to a member, and starting, when starting an arc. CONSTITUTION:When welding the first layer, a torch is thrust into a member from a torch position in case of regular fillet weld, is made close to each other, and is placed at a position A1. In accordance with the welding condition, an arc is generated under a lower condition than regular current and voltage, and the torch is moved to a position A2 of a constant distance at a high speed about 3 times as high as a regular welding speed. Subsequently, the welding condition and speed are returned to a regular state, the torch is separated from the member, is returned to its regular position, is moved to a position A3, and after that, regular fillet weld is executed. Subsequently, when welding the second layer, in a state that the torch has been thrust into the direction A1 from a position B1 separated in the unwelded direction of the opposite side from the arc start A1, it is moved to a position B2 under a low welding condition and at a high speed. It is moved to a position B3 from the position B2, is moved to a position B4, returning the welding speed of the welding condition and the torch position to its regular state, and after that, regular fillet weld is executed. |
