| 摘要 |
PROBLEM TO BE SOLVED: To provide an arc welding method for a high strength steel sheet which is capable of suppressing softening to the minimum at a part affected by welding heat. SOLUTION: This arc welding method for a high strength steel sheet comprises using CO2 gas or mixed gas of Ar and CO2 as shielding gas, and proceeding MAG welding at constant electric current within a limited welding heat. By performing the arc welding within the limited welding heat range, the softening at the part affected by welding heat is minimized, and high conjuntion strength at the arc welding part is obtained.
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