The Effect of Mixing the Additive Material with the Substrate during the Renovation of the Foundry Mold by TIG Welding Hardfacing

The article is focused on the effect of mixing the additional material with the substrate (base material) on the properties of the weld metal during arc welding with TIG technology. The research is aimed at the use of arc welding with TIG technology in the repair of foundry molds. These are repairs of permanent steel foundry molds. The parts of the mold in contact with the liquid metal are subjected to heat-chemical-mechanical stress. This load causes mold wear, which causes a decrease in surface quality and a change in the dimensional accuracy of the casting. The main cause of wear on the functional surfaces of the mold cavity is tribological processes. From the study of professional works dealing with mold wear [5,11,22], it is clear that one of the main parameters for determining the intensity of wear is surface hardness. The theoretical part deals with wear and the factors that affect wear. The experimental part compares the properties of one, two, and three-layer TIG welds, specifically the chemical composition, hardness, and coefficient of friction determined by the "ball-on-flat" method.