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The use of hy Lukasevich Research Network - Institute of Welding, 16-18 Bl. Czeslava str., Gliwice, 44-100, Poland brid laser-arc welding laser + MAG for joining elements of large structures of stainless steel is a relatively new problem. The paper discusses the issues of technology of hybrid welding of austenitic steel X2CrNil8-9 and austenitic-ferritic steel X2CrNiMoN21-5-1 using a disc laser of 12 kW capacity. The technological conditions of hybrid welding with a full penetration of butt joints of steel with a thickness of 8, 12 and 20 mm, as well as T-joints with a butt weld with a partial penetration were determined. The typical defects in welds of high alloy stainless steels, produced by hybrid welding, were indicated. [ABSTRACT FROM AUTHOR]