FILLET MIG ARC WELDING METHOD FOR ALUMINUM THIN SHEET TEE JOINT

摘要

PROBLEM TO BE SOLVED: To form stabilized and good fillet bead by setting a time ratio of a straight polarity period in AC one cycle in a specific range and executing fillet welding with generating AC MIG arc. ;SOLUTION: A Tee joint of a base plate M1 and vertical plate M2 of Al or Al alloy is subjected to fillet welding with an MIG arc. In this case, a thickness of the plates M1, M2 is ≤2mm. A welding torch 2, in which the tip of an energizing tip 2 protrudes by a length L2 of 10-45% of the inner diameter D of a torch nozzle forward from a torch nozzle tip 2b, is used. A time ratio of a straight polarity period in AC one cycle is set to a range of 5-50%. Thus, the AC pulse MIG arc is generated between a welding wire W and a Tee joint corner part A and fillet welding is executed. By this method, repair welding work, etc., are reduced and productivity is improved.;COPYRIGHT: (C)1997,JPO