PROCEDURE FOR WELDING AND SURFACING LOW ALLOYED STEEL FOR SEISMIC-RESISTANT BUILDING STRUCTURES Russian patent published in 2010 - IPC B23K9/00 

FIELD: machine building.

SUBSTANCE: invention can be implemented for welding and surfacing low-alloyed steel for seismic-resistant building structures. There is performed electric-arc weld of high-alloyed steel welding wire containing nitrogen - 0.08-0.20 %, molybdenum 5.0-7.0 %, vanadium 0.70-1.0 % with equivalent of nickel Ni_equiv - not less, than 27 %, and equivalent of Cr_equiv - not less, than 19 %, where Ni_equiv=Ni+30·C+0.5·Mn+30·N, % and Cr_equiv=Cr+Mo+1.5-Si+V, %. Also there is formed a welding seam or surfacing metal of austenite structure, wherein contents of carbon is not more, than 0.20 %, of nickel - not less, than 20 %, of manganese - not less, than 1.0 % , and nitrogen not less, than 0.08 % at a ratio of nickel and chromium Ni ≥1.5-Cr. Not more, than 40 % of welded steel should be present in metal of a welding seam. Contents of alloying elements in metal of the welding seam or in surfacing metal is controlled by Sheffler structure diagram maintaining ratio Ni_equiv not less, than 1.45 Cr_equiv.

EFFECT: facilitating closeness of mechanical properties of cast metal of welding connection and hot rolled basic material, also preventing formation of low plastic sections with mixed structure in metal of welding seam and/or surfacing metal by elimination of martensite, ferrite or carbide constituents presence in structure.

2 cl, 1 dwg, 2 tbl