In the research, tungsten alloy surfacing welding was experimentally carried out on tool steel for hot work, which had previously been heat treated in three different states (soft annealed, hardened and tempered). Welding was carried out successfully, both in one and in three layers. At the micro and macro level, both quantitative and qualitative evaluation of the resulting zones, which appear in relation to the substrate, the heat-affected zone, inhomogeneous mixing zones within the welded layer and the welded surface, was carried out. Hardness profiles are precisely defined in connection with chemical line analysis, which explain the demanding processes of the formation of the new alloy also in connection with equilibrium thermodynamic calculation of phase equilibria and simultaneous thermal analysis. With the help of dilatometric analysis results, the mechanism of crack formation was explained.
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