| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding method of a plate material capable of easily securing a fine clearance for releasing gas generated from a coating layer by heating, between mutual superposed plate materials.SOLUTION: The welding method of the plate material is provided for securing the fine clearance between mutual these first-second galvanized steel plates 1 and 2 when welding by superposing the mutual first galvanized steel plate 1 and second galvanized steel plate 2 including the plate material surface-treated by a galvanized layer for generating zinc gas by heating, and comprises a quenching process (a Step S2) of forming a quenching hardening part 7 by quenching-processing in a vicinal position of a welding part R to the plate-like first galvanized steel plate 1, a pressurizing process (a Step S3) of forming a thickness-reduced part 9 around the quenching hardening part 7 by press-working the first galvanized steel plate 1 for forming the quenching hardening part 7 and a welding process (a Step S4) of melting-welding the welding part R after securing the fine clearance between the plate materials by the thickness-reduced part 9 by superposing the second galvanized steel plate 2 on the thickness-reduced part 9 of the first galvanized steel plate 1. |
