Resistance type flash butt welder

Details Resistance type flash butt welder Resistance type flash butt welder

1976-08-20

1978-02-28

Goldberg, Elliot A.

Electric heating

Metal heating

For bonding with pressure

B23K 1104

Patent

active

040769739

ABSTRACT:
A welding apparatus employing a self-contained pumping accumulator plant hydraulically associated with a hydraulic ram of a moving clamp transfer gear for gripping pipes being welded. The apparatus employs a device for decreasing the pressure in the hydraulic ram and in a pilot valve during flashing and for increasing pressure during upsetting. The apparatus also employs a a low-pressure high-capacity pump with a filter, a relief valve, a nonreturn valve and an unloading slide valve, two high-pressure low-capacity pumps and a device for cutting the pumps and the unloading slide valve in and out. The pumping accumulator plant and the high-pressure pumps communicate with a main oil plant; a hydraulic control of the slide valves of the clamp hydraulic drives is connected to the pumping accumulator plant. The pilot valve is controlled by a welding process program control actuator.

REFERENCES:
patent: 3748431 (1973-07-01), Mezbard

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