FIELD: process, welding.
SUBSTANCE: invention concerns fabrication of critical metal structures. Particularly it concerns oil and gas-tube fabrication and can be used for thermoplastic hardening of welded joints. There are used heating power from welding process and natural cooling in the open air up to the temperature which is below structural phase transformation. Then it is implemented blast cooling of welded joint by air-steam mixture, by water or air under pressure at least 0.5 MPa. Consequently it is achieved rising of welded joints quality, reducing of hardening process energy capacity and productivity improvement.
EFFECT: rising of welded joints quality, reducing of hardening process energy capacity and productivity improvement.
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