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Investigated are structure and phase composition of weld metals as well as HAZ of welded joints (of carbon, low-alloy structural and cold-resistant steel, nickel and aluminum alloy and others) in fusion welding and reconstruction repair surfacing using different welding consumables (electrodes, fluxes and wires). Analytical estimations of role of forming structural parameters in change of complex of mechanical properties, as well as nature of distribution and localizing of deformations, level of local internal stresses, intensity and extension of stress concentrators, being potential sources of crack formation generated in welding, were carried out based on experimental data, received on different structural levels (from grain to dislocation ones). The results of carried investigations were used for correction of technological processes of welding that allowed providing high complex of mechanical properties and crack resistance of welded joints. 12 Ref., 7 Figures.

Effect of structural factors on mechanical properties and crack resistance of welded joints of metals, alloys and composite materials