FIELD: post-welding processing of erection butt joints of pipelines.
SUBSTANCE: invention relates to ultrasonic impact treatment of butt joints of pipes of strength class K60. Ultrasonic impact treatment is performed on the inner side of the pipe wall in the zone of the root weld with width of processing section from 30 to 80 mm at speed of 0.06 m/min with provision of reduction of level of tensile residual stresses or their complete transformation into compressing ones.
EFFECT: reduced level of tensile residual stresses in butt joints of pipes.
1 cl, 3 dwg
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