LASER ARC HYBRID WELDING METHOD FOR HIGH TENSILE-STRENGTH STEEL PLATE, AND HIGH TENSILE-STRENGTH STEEL PLATE-WELDED METAL PRODUCED BY THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a laser arc hybrid welding method for a high tensile-strength steel plate by which a welded metal having high tensile strength and toughness can be manufactured by selecting a welding material suitable for the composition of a steel plate when working a high tensile-strength steel plate with a tensile strength of 780 to 980 MPa class by laser arc hybrid welding and welding it, and to provide a high tensile-strength steel plate-welded metal produced by the same.

SOLUTION: When applying laser arc hybrid welding to a high tensile-strength steel plate, a high tensile-strength steel plate having 0.03 mass% or less in Ti content is subjected to laser arc hybrid welding by employing a welding material having 0.06 mass% or less in Ti content. The welding material is selected in which carbon equivalent CeqYcalculated from its composition satisfies a predetermined range of carbon equivalent CeqXof the high tensile-strength steel plate, thereby producing a welded metal having both high tensile strength and high toughness.

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