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AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsShota KIKUCHI, Manabu FUKUMOTO
Estimating the term…
The fatigue strength of a lap-welded joint, wherein an overlapping portion of a first steel material and an overlapping portion of a second steel material overlap with each other, and an edge portion of the first steel material is welded to a front face of the second steel material with a weld zone extending along the edge portion, is improved. First, when a direction perpendicular to an extending direction X of the weld zone and parallel to a front face of the second steel material is defined as a reference direction Y, the lap-welded joint is restrained from moving in the reference direction Y, and the first steel material and the second steel material are restrained from moving in their sheet-thickness directions. In this state, a portion of the second steel material is heated such that a melted portion is formed in the portion of the second steel material.
A method for improving a fatigue strength of a lap-welded joint in which a portion of a first steel material having a predetermined thickness and a portion of a second steel material having a predetermined thickness overlap with each other as overlapping portions, and an edge portion of the first steel material is welded to a front face of the second steel material with a weld zone extending along the edge portion, wherein,
A manufacturing method for a lap-welded joint comprising a welding step of welding a first steel material and a second steel material together to obtain a joined body, and a heating step of heating the joined body, wherein
A lap-welded joint in which an edge portion of a first steel material is welded to a front face of a second steel material, in a state where a portion of the first steel material and a portion of the second steel material overlap with each other as overlapping portions, the lap-welded joint comprising:
Dependencies are inferred from the claim text.