FIELD: technological processes.
SUBSTANCE: invention relates to welding, namely to welding of thick-wall structures. To increase resistance to occurrence of cracks during operation due to improved mechanical properties method involves application of cyclic load on crystallizing metal of welding bath. Welding of each odd layer of multi-layer welding, including first and last ones, is accompanied by ultrasonic treatment, and welding of each even layer is accompanied by cooling. Ultrasonic vibrations are introduced at angle of 45-60° to seam axis, while cooling is performed from opposite side relative to heating source with air-water mix with temperature from 10-15 °C and flow rate of mixture of 0.3-0.5 l/min.
EFFECT: increase of durability, improved mechanical properties.
3 cl, 5 dwg, 1 tbl
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