FIELD: technological processes.
SUBSTANCE: invention relates to a method for automatic welding thick-walled large-size parts from Ni-Cr-based alloy and can be used in production of a liquid-propellant engine. Proposed method comprises V-shaped cutting edges of welded parts, installation of welded parts on the substrate, multilayer welding using a filler wire from Ni-Cr-based alloy with diameter of 2–2.5 mm. Then, the welded joint is being hardened at 1,050±10 °C. Then, part is being cooled at a rate of 30–40 °C/min, and during cooling when temperature of 700–780 °C is achieved, the part is being held for 60±10 and, then, cooled.
EFFECT: invention allows preventing cracks in heat-affected zone of welded parts.
1 cl, 3 dwg, 1 ex
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