Machine for resistance butt welding of pipes

Details Machine for resistance butt welding of pipes Machine for resistance butt welding of pipes

1988-12-16

1989-12-05

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 67, B23K 1102

Patent

active

048854506

ABSTRACT:
The machine of the invention, intended for resistance butt welding of pipes, comprises two semi-housings mounted externally on the pipes to be welded to the opposite sides of a joint and interconnected by the flash and upset drive, a clamping device mounted in each semihousing, including radially arranged hydraulic cylinders with clamping shoes, and a control system of the hydraulic cylinders.
The control system of the hydraulic cylinders includes control valve units structurally associated with the piston rods of the hydraulic cylinders. The control valve units include follow-up spool valves interconnected by their common actuator linkage.

REFERENCES:
patent: 2974217 (1961-03-01), Crawford
patent: 3732391 (1973-05-01), La Force et al.

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