Apparatus for flash welding of pipes

Details Apparatus for flash welding of pipes Apparatus for flash welding of pipes

1981-08-24

1984-12-25

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 66, 219 97, 219116, B23K 1104, B23K 1132

Patent

active

044905998

ABSTRACT:
An internal apparatus for flash welding pipes together in end to end relationship both under factory conditions and in the field, for example in laying trunk pipelines, comprises an elongate supporting member carrying an axially movable clamping assembly with electrode jaws for clamping one pipe, an axially immovable clamping assembly with electrode jaws for clamping the other pipe, and a doughnut-type welding transformer. The welding transformer is disposed at the side of the axially immovable clamping assembly, which is distant from the joint. The axially immovable clamping assembly is mounted on the elongate supporting member in a manner to provide an annular clearance therebetween such that there are extending therethrough two coaxial contact tubes, which are electrically insulated from one another and connect the welding transformer with the electrode jaws, whereby in operation a welding circuit is established.

REFERENCES:
patent: 2993109 (1961-07-01), Tudbury
patent: 4273985 (1981-06-01), Paton et al.
patent: 4310737 (1982-01-01), Paton et al.

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