Electric heating – Metal heating – For bonding with pressure
Patent
1987-08-14
1989-10-03
Albritton, C. L.
Electric heating
Metal heating
For bonding with pressure
219 7801, 219 912, B23K 928
Patent
active
048718947
ABSTRACT:
A method for producing a piston rod for securing a ball to each end of a rod through projection welding which comprises detachably retaining the ball to be secured in a ball holder for presenting the proximate rod end to the ball; the ball holder being constructed of electrically conductive material to provide a first electrode, with the rod holder being constructed of electrically conductive metal to provide a second electrode. The ball holder and rod holder are adapted for relative travel toward each other to effect a mutual zone of ball and rod contact. Electric current is then passed through the first and second electrodes for projection welding of the ball and rod through the zone of contact while the same are in an inert gas atmosphere. Then the now welded contact is cooled; and thereafter a second electric current is passed therethrough to temper the weld. Apparatus useful for effecting such method is provided having suction means for retaining the ball during performance of the method; there being further provided a stopper element for limiting the relative travel of the ball holder and rod holder toward each other.
REFERENCES:
patent: 3975611 (1976-08-01), Gordon
patent: 4609805 (1986-09-01), Tobita et al.
Koizumi Hiroyasu
Suzuki Masaomi
Albritton C. L.
Donovan Lincoln
Nihon Radiator Co. Ltd.
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