公开(公告)号：US09899805B2

公开(公告)日：2018-02-20

申请号：US15036607

申请日：2014-08-21

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tomoaki Kato ,  Ryuichi Ohno

IPC: H01T21/02 ,  H01T13/20

CPC classification number: H01T21/02 ,  H01T13/20 ,  H01T13/39

Abstract: Provided is a method for manufacturing a spark plug, wherein at least one of a center electrode and the ground electrode includes an electrode base material and a columnar noble metal tip welded to the electrode base material. The method includes a laser welding step of applying a pulse oscillation laser to form a plurality of unit fusion portions on a peripheral area of a boundary between the electrode base material and the noble metal tip and welding the electrode base material and the noble metal tip. One unit fusion portion is formed by one-time laser irradiation. In the laser welding step, an irradiation axis of the laser is displaced from a central axis of the noble metal tip in a radial direction of the noble metal tip. When a diameter of the noble metal tip is denoted as a diameter A and an amount of displacement of the irradiation axis of the laser is denoted as X, A/20≦|X|≦A/4 is satisfied.

公开(公告)号：US20140175967A1

公开(公告)日：2014-06-26

申请号：US14235824

申请日：2012-06-08

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tomoyuki Igarashi ,  Ryuichi Ohno ,  Tatsunori Yamada ,  Katsutoshi Nakayama

IPC: H01T13/16

CPC classification number: H01T13/16 ,  F02P13/00 ,  H01T13/20 ,  H01T13/39

Abstract: A spark plug has a center electrode having an electrode base member and a core material which is disposed in the electrode base member and which predominantly contains copper, and a noble metal tip disposed at a forward end of the center electrode, and a fusion portion formed between the noble metal tip, and the electrode base member and the core material. The fusion portion is in contact with the core material in a cross section which is parallel to the center axis of the center electrode and which passes through the center axis and the fusion portion. The fusion portion contains a component of the noble metal tip, a component of the electrode base member, and a copper component forming the core material.

Abstract translation: 火花塞具有中心电极，该中心电极具有设置在电极基体中并且主要包含铜的电极基体和芯材，以及设置在中心电极前端的贵金属电极头和形成的熔融部分 在贵金属端头与电极基体和芯材之间。 熔接部与芯材以与中心电极的中心轴平行且穿过中心轴和熔融部的横截面接触。 熔融部包含贵金属电极头的成分，电极基体的成分和形成芯材的铜成分。