Method of welding capped wheel nut

Details Method of welding capped wheel nut Method of welding capped wheel nut

1979-07-25

1981-06-23

Grimley, Arthur T.

Electric heating

Metal heating

For bonding with pressure

219 861, 10 86C, 411430, B23K 1114, B21D 5324, F16B 3714

Patent

active

042752850

ABSTRACT:
A steel nut body has its wrench flats covered by a sheet stainless steel sheath that extends over one of the nut ends to form a cap. The surfaces of the wrench flats are formed with ridges that bear against the inner surfaces of the sheath. The sheath is welded to the nut to resist forces exerted during torquing by bringing a pair of electrodes into pressured contact with the sheath on opposed sides of the nut to produce pressure concentrations at the ridges. An extremely short, high current electrical pulse is then passed between the electrodes. The heating produced by the current at the interface between the sheath and the nut body decreases the electrical resistance of this path resulting in primary current flow path between the two interfaces, through the nut body, to produce resistance welds at the inner faces without substantially modifying the metallurgy of the sheath.

REFERENCES:
patent: 928701 (1909-07-01), Rietzel
patent: 2137909 (1938-11-01), Hagedorn
patent: 3076086 (1963-01-01), Adams
patent: 3272960 (1966-09-01), Smith
patent: 3781981 (1974-01-01), Miura et al.
patent: 3946190 (1976-03-01), Hascoe
patent: 4056862 (1977-11-01), Chaivre et al.

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