FIELD: technological processes.
SUBSTANCE: invention refers to the technique for laser or hybrid laser-arc welding of butt joints of thick-walled structures, in particular, for welding of longitudinal seams of large diameter pipes, circumferential seams of pipes and pipeline products. Welding of butt joints is carried out by means of an electric arc and/or a laser beam. The filler wire is fed to the weld pool. Before welding, a layer of alkali metal compounds selected from the group consisting of sodium and potassium, is applied to the welded edges. Herewith the alkali metal compounds are applied to the edges of the welded joints in the form of a solution or a powder.
EFFECT: method allows to increase the melting capacity of the laser beam and to reduce the number of defects in the weld seam arising from laser or hybrid laser-arc welding.
3 cl
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