JPS55128376A - Wire feed speed control method in arc welding machine - Google Patents

Abstract

PURPOSE: To perform slow-down controlling which does not impair workability by releasing the slow-down controlling then inching a wire with a torch switch when the time after pushing of the torch switch until the wire contacts the base metal becomes more than the specified time.

CONSTITUTION: This wire feed speed control circuit is constituted largely by a torch switch 1, a slow-down controlling release circuit 2 which releases the slow-down controlling after the lapse of a fixed time of the closing state of the switch 1, a wire feed speed setting circuit 3 at the welding, a slow-down speed setting circuit 4, etc. If in the above-mentioned constitution the switch 1 has been closed for more than a fixed time, the slow-down controlling having been continued till that time is released 2, after which the wire inching is performed at the feed speed at the time of welding. Namely, the inching may be accomplished by the torch switch, even while the slow-down controlling is being performed.

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