FIELD: metallurgy.
SUBSTANCE: after laser or laser-arc welding of pipes, the welded area of pipes is cooled by laser radiation until they are completely melted. The cooling of welded seam is performed in the temperature interval Ms, where Ms is the starting temperature of martensite formation, and to a temperature not lower than Mf, where Mf is the temperature of the martensite formation completion. Then it is reheated to a temperature of Ms (+100…300)°C with further final cooling. In this case, cooling is carried out in the air, or by water, or by a water-air mixture. Reheating is performed by an induction method or laser.
EFFECT: improved micro-structure of the welded seam.
3 cl, 2 dwg
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