Method of making a spark plug

Details Method of making a spark plug Method of making a spark plug

1993-07-26

1994-06-14

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

21912164, H01T 2102

Patent

active

053205693

ABSTRACT:
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.

REFERENCES:
patent: 4695699 (1987-09-01), Yagii et al.
patent: 4904216 (1990-02-01), Kagawa et al.
patent: 4963112 (1990-10-01), Benedikt et al.

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