FIELD: processes for welding tube butts at making pipelines, possibly erection of main and plant pipelines of large diameters, with thick and thin walls, mainly in oil and gas production, missile making industry branches.
SUBSTANCE: method comprises steps of dressing welded tubes edges and blunting them; assembling tubes and centering them; before welding heating up tube end portion along length equal approximately to 50 mm for tube made with negative allowance until equalizing diameter of said portion and diameter of tube made with positive allowance; realizing heating by means of heater arranged on end of tube made with negative allowance; performing electric-contact or electric-arc welding of butts of tubes.
EFFECT: high-quality welded joints of pipelines due to increased strength of welded seam, enhanced efficiency of welding-mounting operations due to elimination of procedure for selecting tubes with the same diameters of their end portions made according to standard allowances for their diameters.
3 cl, 4 dwg, 1 ex
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