FIELD: electricity.
SUBSTANCE: edges of pipe billets are joined by laser or hybrid arc augmented laser welding in a single weld pool. Welding is performed when moving the pipe billet with respect to the stationary welding head in a horizontal plane with the introduction into the weld pool of ultrasonic vibrations throughout the welding cycle. The ultrasonic waveguide is installed behind the laser beam at a distance of no more than 50 mm from the weld pool, which is maintained during the welding process by means of a sliding contact. Between the waveguide and the surface of the pipe, a coupling fluid is applied in the form of water or glycerine.
EFFECT: improving weld quality by reducing the rate of crystallization of metal in a steam-gas channel, excluding the formation of undesired hardening structures in the weld metal.
2 cl, 1 dwg
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