Method of projection-welding bolts

Details Method of projection-welding bolts Method of projection-welding bolts

1994-09-02

1996-04-16

Walberg, Teresa J.

Electric heating

Metal heating

For bonding with pressure

B23K 1114

Patent

active

055084885

ABSTRACT:
This invention is intended to secure a fused area which is as large as possible in fixing a flanged bolt in position by projection welding. A welding method characterized by forming a flange 3 with a flat bulge 4 having a crest 5 and enlarging the melting starting at the crest 5 throughout the bulge while pressing the crest 5 against a mating member 7. And the flange and the mating member are strongly clamped between a fixed electrode 6 and a movable electrode 8. As for the shape of the bulge, it may be tapered, spherical or the like. Further, the diameter of the bulge 4 is set so that it is greater than the diameter of the bolt stem 2.

REFERENCES:
patent: 1101858 (1914-06-01), Lachman
patent: 1982098 (1934-11-01), Hartmann
patent: 3225172 (1965-12-01), Nooker et al.
patent: 4382172 (1983-05-01), Takasugi et al.

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