摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a spark plug capable of restraining lack of mutual welding between an electrode chip and a center electrode, boring of a laser welding part, or the like in welding the electrode chip to the center electrode, and of improving welding strength of a ignition part. <P>SOLUTION: The electrode chip 31' formed of, for instance, an Ir alloy is placed on a tip surface 3s of the center electrode 3 to form a laminated assembly 170, and the laminated assembly is irradiated with a laser beam LB to weld the electrode chip 31' to the center electrode 3. At that time, a chuck 11 formed of Cu is brought into contact with the center electrode 3 as a cooling material 11. The chuck 11 is cooled by a coolant 13 such as water. <P>COPYRIGHT: (C)2003,JPO</p> |