Patent ID: 6659826
Filing Date: 2003-12-09
Classification: B23K,H01T

Abstract:
A method for manufacturing a spark plug having two electrodes opposed to cause a spark discharge and a noble metal tip welded to at least one of these plug electrodes, said manufacturing method comprising:a first process for clamping said tip by first and second guides of a guide jig approaching to each other in a direction normal to an axial direction of said tip and locating said tip to a predetermined position on a plug electrode; a second process, succeeding said first process, for depressing said tip by a welding electrode under a condition that the tip is held by the guide jig, in which a thickness of said guide jig is smaller than a clearance between said welding electrode and said plug electrode; a third process, succeeding said second process, for removing said first and second guides of said guide jig from said tip in the direction normal to the axial direction of said tip; and a fourth process, succeeding said third process, for welding said tip to said plug electrode by supplying electric power to said welding electrode.