| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a spark plug which prevents a large clearance between an intermediate member and an outside electrode base material, and prevents peel-off on a molten metal part between an outside electrode chip and the intermediate member even in a severe heat cycle test. SOLUTION: The spark plug 100 includes a center electrode 130, and a ground electrode 140, which is formed by joining a ground electrode chip 143 to a ground electrode base material 141 via the intermediate member 142. In the method for manufacturing the spark plug 100, a projecting portion 142p is provided on the intermediate member 142, and the intermediate member 142 is projection-welded to the ground electrode base material 141 by means of the projecting portion 142p, to thereby join the intermediate member 142 to the ground electrode base material 141. COPYRIGHT: (C)2009,JPO&INPIT
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