FIELD: metallurgical industry. SUBSTANCE: the process of thermal treatment of welded titanium alloy articles comprises heating at a rate of 60-300 C/s to a temperature of 850-920 C, holding for 15-180 s and cooling at a rate of 10-200 C/s, subsequently ageing and simultaneously nitrooxidizing or nitriding at a temperature of 510-680 C for 2-30 minutes. The heating operation can be carried out by applying high-frequency currents in a single winding inductor in the air or in a vacuum of 10-3-10-4 Hg mm in a stainless steel converter and the cooling operation can be carried out in an air-water mixture or in liquid nitrogen. The ageing operation can be carried out by heating in an electrolytic plasma containing 6% carbide and 6% ammonium nitrate at a cooling rate of 400-600 C/s. The hardening heating can be performed two times in the range of from 3 to 5 seconds. The ageing operation is followed by spraying with intermetallic compounds such as nickel-titanium or nickel-aluminium. EFFECT: more efficient thermal treatment process. 14 cl, 1 tbl
