发明名称 |
Method of making a spark plug |
摘要 |
In a method of making a spark plug, a recess is provided on an end surface of the electrode blank metal. A straight neck portion is provided around the recess, and forming a tapered surface connecting from the straight neck portion toward an opposite side of the recess. A disc-shaped tip is placed in the recess of the electrode blank metal. The disc-shaped tip is pressed against an inner bottom of the recess in the axial direction of the electrode blank metal, and a laser beam welding is applied to an outer wall of the recess substantially all through its circumferential length by rotating the electrode blank metal.
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申请公布号 |
US5320569(A) |
申请公布日期 |
1994.06.14 |
申请号 |
US19930096435 |
申请日期 |
1993.07.26 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
OSHIMA, TAKAFUMI;MUSASA, MAMORU;OKAYAMA, TSUTOMU;IWATA, KAZUYA |
分类号 |
H01T21/02;(IPC1-7):H01T21/02 |
主分类号 |
H01T21/02 |
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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