METHOD OF WELDING OF NON-ROTARY JOINTS OF MAIN PIPELINE (EMBODIMENTS) Russian patent published in 2019 - IPC B23K9/28 B23K101/06 

FIELD: pipeline.

SUBSTANCE: inventions can be used for welding non-negotiating joints of main pipelines. V-shaped cutting of edges of welded joints of parts of main pipeline is performed, and parts of main pipeline are assembled on inner centraliser without gap between blunting joints. In the first embodiment of the invention, double-sided welding is performed by making a root layer of the seam on the inner side of the main pipeline using automatic plasma welding with a penetrating arc with simultaneous supply of filler wire and performing welding passes on annular connection outer side for filling of edges cutting with application of automatic fusion welding. In the second embodiment of the invention one-side welding is performed, at which along the external side of the above annular connection the root seam is made with automatic plasma welding by penetrating arc with simultaneous supply of filler wire, and then performing filling of remaining part of cutting by welding passages with application of fusion welding on outer side of annular connection.

EFFECT: technical result consists in improvement of efficiency of welding due to higher quality of weld, efficiency and saving filler metal.

2 cl, 10 dwg