| 摘要 |
PROBLEM TO BE SOLVED: To provide an arc welding method and equipment that adds an arc point aiming function and that ensures reduction of high frequency noise and performance of quickly transferring to a desired electric current value. SOLUTION: First, the tip end of the main electrode is brought close to a part to be welded of a base material, and then an arc by a micro current for the purpose of local illumination is generated through start-up by a high frequency voltage. The starting position of the main electrode is established by connecting with a light beam between the tip end of the main electrode and the weld zone of the base material, with welding performed by transferring the arc to the main current arc in this arc welding method. The period for generating the high frequency voltage is only one shortest time within a period from the welding start to the halt. Since the micro current arc is continued during the period from the welding start to the restart through the halt, no start-up by the high frequency voltage is required at the time of the restart, thereby making a high frequency failure trifling. COPYRIGHT: (C)2006,JPO&NCIPI
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