Electrode for a spark plug in which a firing tip is laser welded

Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing

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313142, 313143, H01T 1320

Patent

active

054612764

ABSTRACT:
In an electrode for a spark plug, an elongated blank metal is made of a nickel-based alloy and including a front surface. A firing tip is provided from a slug made of a noble metal, the slug being concentrically placed on the front surface of the elongated blank metal and laser beam welded to thermally melt the entire slug and thereby produce a thermal weld, so that the front surface of the elongated blank metal is partly fused together with the slug to form a melted portion with the front surface and the slug so as to contain the front surface within the melted portion in the range of 0.5 wt % to 80.0 wt %.

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patent: 4771210 (1988-09-01), Mohle et al.
patent: 4803395 (1989-02-01), Matesco
patent: 4840594 (1989-06-01), Moore
patent: 4904216 (1990-02-01), Kagawa et al.
patent: 4963112 (1990-10-01), Benedikt et al.

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