B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/37
B23K 9/00 (2006.01)
Patent
CA 1121868
A METHOD AND APPARATUS FOR WELDING GIRTH JOINTS IN PIPE LINES ABSTRACT OF THE DISCLOSURE A method for welding girth joints in pipelines using two welding heads comprises the steps of moving each of the welding heads upwards around the pipeline along the respective section of the girth joint, feeding a welding wire to each of the welding heads so that the welding wire is fed substantially tangentially with respect to the surface of the pipe, and for- ming a circumferential weld by moulding it to hold the molten metal of the welding bath in the welding zone. An apparatus for carrying out the method for welding girth joints in pipelines comprises an annular track struc- ture having at least two carriages mounted thereon which are connected with drives adapted to impart a translatory motion to the carriages. Each of the carriages carries a welding head provided with a welding wire feeder and a weld moulding member arranged opposite to the joint being welded. The welding wire feeder includes a guiding nozzle extending under the weld moulding member, with its axis being oriented tangentially to the surface of the pipe to feed the welding wire into the welding zone through the groove of the joint. The moulding of the weld prevents the molten metal of the welding bath from flowing out of the groove of the joint, which makes it possible to considerably reduce the number of passes required and thus to increase the quality and efficiency of the welding.
321157
Belfor Mikhail G.
Dubovetsky Vasily Y.
Gavriljuk Jury A.
Kopylov Leonid N.
Kotov Valentin A.
Institut Elektrosvarki Imeni E.o. Patona Akademii Nauk Ukrainsko
Marks & Clerk
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