| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in which strength of a weld zone is lower than that of base metal in the welding of quenched and tempered high tensile strength steel or cold-working material and a problem in which welding efficiency deteriorates when the lowering of strength of a welding heat affected zone and a welding metal is lowered by small heat input and low interpass temperature in regular welding. SOLUTION: Without having specification of a backing strip merely for prevention of burn through in welding, all lines of the backing strip and the base meal are fillet-welded, with a part of stress of the base metal transferred to the base metal on the opposite side through the fillet welding and the backing strip. Also, the bead is placed outside the groove in the welding of the last layer in regular welding, with the toe part reheated in the welding. Consequently, a stress per unit area of the regular weld zone is reduced, enabling the welding to produce a strength higher than that of the base metal in highly efficient welding. COPYRIGHT: (C)2011,JPO&INPIT
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