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1. (WO2017038981) SPOT WELDING METHOD

Pub. No.:    WO/2017/038981    International Application No.:    PCT/JP2016/075839
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: B23K 11/11
B23K 11/16
B23K 11/24
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: YOSHINAGA Chisato
吉永 千智
MIYAZAKI Yasunobu
宮▲崎▼ 康信
HAYASHI Kunio
林 邦夫
KAWATA Hiroyuki
川田 裕之
YASUYAMA Masanori
泰山 正則
Title: SPOT WELDING METHOD
Abstract:
Provided is a spot welding method for use with a member to be welded constituted of a plurality of steel sheets that overlap each other at least at a welding point, wherein at least one of the plurality of steel sheets is covered by zinc-based plating at least on the overlapping face thereof at the welding point, the total thickness t (mm) of the plurality of steel sheets is greater than or equal to 1.35 mm, the squeeze time St (seconds) from the time when welding electrodes are brought into contact with the member to be welded to the start of welding energization satisfies "0.020 ≤ St," and the post-welding hold time Ht (seconds) from the end of welding energization between the welding electrodes to the time when the welding electrodes and the member to be welded are brought out of contact satisfies "0.015t2 + 0.020 ≤ Ht."