Device for internal welding of pipes or the like
AssigneeVEB Gaskombinat Schwarze Pumpe
InventorsErich Girodi, Gunter Bornowski, Eberhard Dejmek, Andreas Knabe, Roland Koch, Bernd Urbach, Arnold Weisselberg
Life of this patent
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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.
Claims10
A device for internal welding of elongated objects, such as pipes, tanks or the like, particularly pipes of greater diameters and lengths, comprising means for rotating an object being welded about a central axes thereof;
- a car carrying welding equipment and positioned within an object to be welded;
- at least two subframes spaced from each other in the direction of elongation of said object and each carrying a plurality of tread rollers, said subframes being positioned within said object, said tread rollers being provided with locking means adapted to lock said tread rollers against an inner surface of said object;
- and at least one shaft arranged to be positioned along the central axis of the object and pivotally mounted in said subframes, said shaft being rigidly connected to said subframes so that upon rotation of said object about the central axis thereof said car is able to pivot freely about the central axis of the object and is permanently hung downwardly by its own weight, whereby a complete welding of an internal circumferential seam of said object is produced upon a complete rotation of the object by said rotating means.
Dependencies are inferred from the claim text.