| 摘要 |
PROBLEM TO BE SOLVED: To improve spark wear resistance of an ignition plug for an internal combustion engine, in which a noble metal chip is provided at the tip of a center electrode.SOLUTION: When welding and fixing the noble metal chip 10 to a pedestal part 11 provided at the tip of the center electrode 1, a pedestal part slope Tis provided along a straight line connecting a tip side boundary surface Plocated at the boundary of a welding range ARand the metal chip 10 and a base end side boundary surface Plocated at the boundary of the welding range ARand a center electrode slope 12, a laser beam is irradiated to the pedestal slope T, and a welded part 110 having a curved surface 111 concavely depressed toward the inside is thereby formed. |
