| 摘要 |
A welding joint comprises a pair of steel materials, and a welding metal that is formed with a high-energy density beam at a butt welding portion between the pair of steel materials, wherein a transformation starting temperature Ms that is calculated by a following formula: Ms(° C.)=371−353C−22Si−24.3Mn−7.7Cu−17.3Ni−17.7Cr−25.8Mo, using a composition of mass % of the welding metal is 250° C. or less.
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