发明名称 |
SPARK PLUG MANUFACTURING METHOD |
摘要 |
<p>There is provided manufacturing method of a spark plug that includes a center electrode and a ground electrode with a discharge gap left therebetween. At least one of the center electrode and the ground electrode has an electrode body containing a base metal and a noble metal tip welded to the electrode body. The spark plug manufacturing method includes a laser welding step for welding the noble metal tip and the electrode body by placing the noble metal tip at a given position on the electrode body, irradiating a pulsed laser onto the noble metal tip and the electrode body and thereby sequentially forming welding spots corresponding to pulses of the laser in a circumferential direction of the noble metal tip, wherein at least one of the laser pulses is an initially increasing type laser pulse having a laser intensity waveform in which a laser intensity increases with time during a predetermined initial period from a pulse start time.</p> |
申请公布号 |
EP2133968(B1) |
申请公布日期 |
2013.12.25 |
申请号 |
EP20080738982 |
申请日期 |
2008.03.27 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
KATO, TOMOAKI;TAIDO, AKIKAZU;NAKANO, YUICHI |
分类号 |
H01T13/20;B23K26/00;B23K26/20;H01T21/02 |
主分类号 |
H01T13/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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