公开(公告)号：EP0588495A1

公开(公告)日：1994-03-23

申请号：EP93306484.2

申请日：1993-08-17

申请人： NGK SPARK PLUG CO., LTD

发明人： Matsutani, Wataru ,  Kagawa, Junichi

IPC分类号： H01T13/39 ,  H01T21/02

CPC分类号： H01T13/39 ,  H01T21/02

摘要： A spark plug includes a cylindrical metallic shell having an insulator in which a center electrode is placed, a front end of which somewhat extends beyond the insulator; a noble metal portion is boded to an outer side wall of the front end of the center electrode by means of laser beams so as to form a spark gap between the noble metal portion and a ground electrode which is depended from the metallic shell. The noble metal portion has a molten alloy layer in which the center electrode is melted into the noble metal portion, and a diffused alloy layer in which the noble metal portion is diffused into the center electrode.

摘要翻译： 火花塞包括具有绝缘体的圆柱形金属壳体，其中放置中心电极，其前端稍微延伸超过绝缘体; 通过激光束将贵金属部分连接到中心电极的前端的外侧壁，以便在贵金属部分和取决于金属壳的接地电极之间形成火花隙。 贵金属部分具有熔融合金层，其中中心电极熔化到贵金属部分中，以及扩散合金层，其中贵金属部分扩散到中心电极中。