Method of projection-welding bolts
OwnerYoshitaka Aoyama, Shoji Aoyamainventors
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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.
Claims8
A method of projection-welding bolts, comprising the step of:
- forming a flange surface of a bolt having a circular flange with a bulge having a crest, said bulge tapering substantially linearly from the crest toward the flange with an angle of inclination of an outer surface of said bulge being in a range of 3.degree. to 90.degree.;
- and
- passing a welding current while pressing the crest of said bulge against a mating member, whereby a welded portion between the crests and the mating member is enlarged through the entire bulge.
A method of projection-welding bolts, said method comprising the steps of:
- forming a flange surface of a bolt having a circular flange, said circular flange being thicker toward a central portion thereof than toward a periphery of the flange surface, said central portion of said circular flange having crest thereupon, wherein a surface of said flange provides a concave outer surface between the periphery of the flange and the crest thereof;
- and
- passing a welding current while passing the crest of the central portion of the circular flange against a mating member, whereby a welded portion between the crest and the mating member is enlarged through the central portion.
Dependencies are inferred from the claim text.