Electric heating – Metal heating – For bonding with pressure
Patent
1995-11-29
1998-06-09
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 55, B23K 1102
Patent
active
057638500
ABSTRACT:
An improved welding process in which two metallic pieces are each composed of weld compatible parent metal, one metallic piece has one surface and the other metallic piece has another surface each having prominences positioned thereon and an oxide of parent metal disposed on the overlying surfaces and prominences including the steps of applying a force along longitudinal axis of metallic pieces to position the prominences to abut; applying a force transverse to the longitudinal axis of one metallic piece providing relative movement in first and second directions transverse to the longitudinal axes, causing displacement to the cross sections of the metallic pieces, moving one surface transverse relative to other surface and the longitudinal axis; and causing an electrical current to pass through metallic pieces elevating temperatures with electric resistance heating for thermal-fusion welding by the relative movement. Another welding process with parent metals of metallic pieces incompatible during heating includes the steps of aligning surfaces to overlie one another; positioning a gap therebetween and positioning surrogate electrically conductive piece in gap; applying force along a longitudinal axis of each metallic piece, applying a force to either the surrogate or metallic piece transverse to the longitudinal axes causing displacement of the surrogate; applying current through metallic pieces and surrogate providing electrical resistance heating; cease applying force to surrogate piece leaving a film; encapsulating surfaces with an inert gas; and removing of surrogate piece and thermal-fusion force welding the two metallic pieces together.
REFERENCES:
patent: 2193490 (1940-03-01), Rehse
patent: 3472996 (1969-10-01), Braid et al.
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