PURPOSE: To avert multipass welding and to provide an improvement in welding efficiency and a decrease in a filler metal by inserting plural pieces of belt-like electrodes into the narrow gap in the weld zone of thick plates and subjecting the narrow groove to arc welding by using a ceramic nozzle for the preceding electrode.
CONSTITUTION: The butt-weld zone of thick plates 1, 1 is made into a narrow gap 2, and plural belt-like electrodes are inserted into the gap 2 by matching the transverse direction thereof and the welding advance direction in a band arc welding method of thick plates by using the belt-like electrodes. The bottom part of the gap 2 is melted by the preceding electrode 3 using a ceramic nozzle 4 among the above-mentioned belt-like electrodes at about 70W80° angle of inclination α with respect to the top surface of the plates 1. The melting in the upper part of the gap 2 and the formation of a bead appearance are accomplished at the same instant by a succeeding electrode 5 among the belt-like electrodes at about 50W60° angle of inclination β, by which the arc welding of the gap 2 is accomplished efficiently in one pass.
NAKAJIMA HIROYUKI
NOHARA KAZUHIRO
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