FIELD: manufacturing technology.
SUBSTANCE: invention relates to production of large-diameter pipes and can be used in industries, for example, shipbuilding. In the method of laser-arc welding of pipes, tube workpiece is welded by hybrid laser-arc welding in pulse-periodic mode, wherein the same frequency of electric arc pulsations and laser radiation is selected. Fluctuations of electric arc current and laser radiation power are synchronized in time, ensuring matching of front fronts of electric arc pulses and power of laser radiation or advance of laser radiation pulse. An advance of the front of the laser radiation pulse is provided by not more than 200 mcs relative to the edge of the electric arc pulse. Pulse frequency is selected in range of 100–900 Hz, arc current of 300–800 A, laser power of 1–20 kW, pulse ratio of 0.2–0.7.
EFFECT: increased stability of welding process, small-drop metal transfer and increased mechanical properties of seam.
6 cl, 2 dwg
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