| 摘要 |
PROBLEM TO BE SOLVED: To reduce an electromagnetic wave noise which is generated by applying a starting high-frequency voltage, in an arc start control method of non-consumable electrode arc welding.SOLUTION: When welding torch reaches a pretaught welding initiation position Lc with movement of a robot at a time t2, the welding torch is moved forward. When the welding torch reaches a pretaught arc generation position La at a time t3, starting high-frequency voltage is applied. When arc is generated at a time t4, the welding torch is moved backward while the arc generation state is held. When the welding torch is returned to the welding initiation position Lc at a time t5, the welding torch is moved along a welding line to perform welding. Consequently, even when the intensity of the starting high-frequency voltage is set to be feeble, since the starting high-frequency voltage is applied after the distance between an electrode and base metal is shortened, an arc is instantaneously ignited and an electromagnetic wave noise is reduced. |
