To provide a spot welding method capable of stably spot-welding three or more superimposed steel sheets mutually without causing welding defects even by using a movable spot welding machine.
Among three or more steel sheets 1-3 to be superimposed mutually, the strongest one 2 is positioned between the other two steel sheets 1, 3. In such superimposed condition, the three steel sheets are held between a pair of electrode tips 12, 14, and then, the parts so held in-between are spot-welded to each other. Thus, the steel sheets 1, 3 having a relatively low strength or rigidity are situated on the outer side in the thickness direction so as to be brought into contact with the pair of electrode tips 12, 14, while the steel sheet having the highest strength or rigidity is situated on the inner side in the thickness direction. Consequently, the three or more superimposed steel sheets 1-3 are suitably spot-welded with stable quality free from welding defects even if a movable spot welding machine is used.
MIYAJI SHINSUKE
SUDO SHUNTARO
IMAI KAZUHITO
FUJIMOTO HIRONORI
TOYOTA MOTOR CORP
SUMITOMO METAL IND
| JPH11114675A | 1999-04-27 | |||
| JP2003010976A | 2003-01-15 | |||
| JP2003231915A | 2003-08-19 | |||
| JP2002256388A | 2002-09-11 | |||
| JPH10121192A | 1998-05-12 | |||
| JPH0970672A | 1997-03-18 |
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