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The paper studied the degree of surface hardening of various low-alloy structural steels by laser weld overlays. Laser welding carried out on the ”Scanner” and «Huffman HC-205.” Studies have been conducted microstructure and elemental composition of built-up layers and the heat-affected zones on steel substratesselected by scanning electron microscopy and X-ray microanalysis. There were also measured the microhardness and built according to the changes in the thickness microhardness themselves claddings and heat-affected zones. As a result, the optimal modes of application of the laser weld overlays on the substrate, allowing to minimize the size of the heat-affected zones and differences in microhardness values, whichreduces the likelihood of cracks and discontinuities. Keywords: surface hardening, nickel alloy, laser cladding

Surface Hardening Low Alloy Structural Steel By Laser Welding