JPS5519460A - Horizontal position narrow groove welding method - Google Patents

Abstract

PURPOSE: To prevent welding defects such as lack of fusion, etc. by directing preceding and succeeding wires to the lower and upper corner parts respectively of a groove and performing welding while letting arc produced alternately from both wires at the time of horizontal-position-welding the narrow groove weld line of metal plates, particularly thick steel plates by the use of 2 electrodes.

CONSTITUTION: Preceding and succeeding chips 4a and 4b are inserted at the specified spacing along the lengthwise direction of the narrow groove A formed by base metal 1 and backing material 2. Namely, welding is performed in the arrow B direction while feeding the preceding wire 3a in such a manner as to direct the lower corner part A-1 of the groove A from the preceding chip 4a and feeding the succeeding wire 3b in such a manner as to direct the upper corner part A-2 from the succeeding chip 4b. Here, the preceding and succeeding wires 3a and 3b are alternately fed and yet arc is produced alternately. Since the succeeding beads 5b are supported by the preceding beads 5a from below, the occurrence of lack of fusion, etc. owing to sagging of the succeeding beads 5b becomes obsolete.

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