Device for internal welding of pipes or the like

Details Device for internal welding of pipes or the like Device for internal welding of pipes or the like

1983-08-09

1985-02-19

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 60R, 219 66, 219 611, B23K 3702, B23K 3106

Patent

active

045007640

ABSTRACT:
Apparatus for internal welding of pipes is provided with an external mechanism for rotating a pipe to be treated and a car insertable into the pipe and operable within the pipe. The car which carries a welding equipment is rigidly mounted to a central shaft which is freely pivotally mounted by means of bearings in two subframes each of which carries a number of tread rollers which can be locked against the inner surface of the pipe, so that the subframes during the operation are rotated together with the pipe whereas the car hangs downwardly within the pipe.

REFERENCES:
patent: 4081651 (1978-03-01), Randolph et al.
patent: 4238659 (1980-12-01), Koshiga et al.

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