Resistance type flash butt welder

Abstract From the Canadian patent

Abstract of the Disclosure A welder, comprising a self-contained pumping accumulator plant associated hydraulically with a hydraulic ram of a moving clamp transfer gear adapted for gripping pipes being welded, a device for decreasing the pressure in said hydraulic ram and in a pilot valve during flashing and for increasing said pressure during upsetting 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 in and out said pumps and the unloading slide valve. The pumping accumulator plant and the high-pressure pumps communicate with a main oil plant and a hydraulic …