FIELD: metallurgy.
SUBSTANCE: method for producing welded joints by friction stir welding for elements made of heat-resistant chromium steel of the martensitic class used for the manufacture of elements of boilers and steam pipelines, as well as steam turbines of power plants with an operating steam temperature of up to 650°C. The method of producing welded joints of martensitic high-chromium steel includes friction stir welding using a tool made of tungsten carbide. The rotation speed of the tool during welding is from 400 to 700 rpm, its feed speed is from 25 to 150 mm/min. After welding is completed, normalization is carried out from a temperature of 1060°C and tempering at a temperature of 770°C with exposure for 3 hours followed by cooling in the air.
EFFECT: formation of an equal-strength welded joint from martensitic high-chromium steel; atomization of the weld structure has a positive effect on the short-term mechanical properties of the welded joint.
1 cl, 1 tbl, 3 ex
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