| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for welding a coated steel plate which allows an electric current to pass across an insulating film-coated surface of a metal plate having one surface coated with an insulating film and a surface in contact with the insulating film-coated surface for jointing by resistance welding between both the materials. <P>SOLUTION: A metal portion of a metal plate having one surface coated with an insulating film is punched from the other surface having no insulating film with a punch having a flat end and a die paired therewith, whereby the lower end of the metal portion on the inner surface of the punched hole is exposed at the surface coated with the insulating film. The exposed portion is then brought into contact with another metal plate to be joined, allowing an electric current to pass therethrough for jointing by resistance welding. The punch and the die for punching are preferably circular in their cross section involved in the punching. <P>COPYRIGHT: (C)2012,JPO&INPIT |
