FIELD: technological processes.
SUBSTANCE: invention relates to a method of laser welding compounds tube-tube plate. Before welding are assembled compounds tube-tube plate with a gap is less than 0.2 mm. Focal plane of the laser beam relative to welded surface of tube plate at a distance -5…+5 mm. Welding is performed in two stages. At the first stage is shifted from the joint laser beam in the direction of tube plate and penetration. At the second stage the laser beam is directed on the joint and welding is carried out. In welding area is inert protective gas in amount of 10-15 l/min. Tube face ledge height relative to welded surface of tube plate is not more than 1 mm. Penetration may perform with laser beam power of ≥ 1 kW at welding rate of ≥ 25 mm/s.
EFFECT: high quality of weld joint.
3 cl, 1 tbl
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