FIELD: welding technology. SUBSTANCE: this can be used for welding metals of high thickness, for example large-diameter pipelines for gas and oil. According to method, filler band material is fed to gap of butt joint. Edges of band are welded to edges of weldable joint. Process is repeated by applying several layers of filler band material until complete filling of joint in thickness is achieved. Layer of upper filler band material is pressed against lower layer so as to ensure strong joining of layers between themselves. Third laser ray is directed to line of contact of layers. Laser ray is linearly polarized in parallel to band plane. EFFECT: high efficiency. 3 cl, 3 tbl, 4 dwg
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