| 摘要 |
PROBLEM TO BE SOLVED: To obtain a gas shield welded joint superior in strength and toughness. SOLUTION: A high tensile strength steel of a thickness t of at least 50 mm, tensile strength TS of at least 900 MPa class is welded by the gas shield arc welding method, welding conditions of the gas shield arc welding and the welding wire being used are adjusted so that a surface width W1 (mm) and rear face width W2 (mm), a cross-sectional area S (mm2) of a weld metal at a cross section of the welded joint and the tensile strength TSw (MPa) of the weld metal satisfy inequalities W2<W1<0.45 t, S/t2<0.4 and 0.95 TS+300 S/t2-135<TSw<0.95 TS, respectively.
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