| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding process by which a Zn-Al-Mg alloy-plated steel sheet can be fusion-welded without bringing about embrittlement cracking of molten metal in a heat-affected zone even when the fusion welding of the Zn-Al-Mg alloy-plated steel sheet is performed without removing a plated layer in advance or suppressing heat input. SOLUTION: The Zn-Al-Mg alloy-plated steel sheet is welded by feeding to a part to be welded chloride-based mixture of 0-100 mol.% ZnCl<SB>2</SB>and 100-0 mol.% NH<SB>4</SB>Cl, or fluoride-based mixture of 0-100 mol.% KAlF<SB>4</SB>and 100-0 mol.% K<SB>3</SB>AlF<SB>6</SB>, and Mg component and Al component are removed from the plated layer alloy in a vicinity of the welded part, and thus the melting temperature of the plated layer alloy is raised, then, cracking attributed to embrittlement of molten metal at a heat-affected zone is suppressed. COPYRIGHT: (C)2005,JPO&NCIPI |
