RATIONAL COMPOSITION OF REFRACTORY COMPONENTS OF WELDING WIRE TO ENSURE WEAR RESISTANCE OF WORKING SURFACES OF PARTS

A brief description of the operating conditions of metallurgical equipment parts and the defects that arise on them is presented. The technology of restoration and hardening surfacing with flux-cored wire under a layer of flux is presented. It has been established that the dominant refractory components of flux-cored wire, affecting the hardness and wear resistance of the deposited material, are tungsten (W), tungsten carbide (WC) and boron nitride (BN). Cylindrical samples with a diameter of 80 mm and a height of 20 mm made of 30CrMnCi high quality steel were used as a substrate. Surfacing was carried out on an installation for automatic surfacing under a layer of flux in the scientific and technical laboratory of restoration and hardening of the National Research University "MISIS", with wires of the ASM 4430-SA grade under a layer of welding flux Ceramax UF-02. After surfacing, the samples were subjected to heat treatment. To conduct studies of the properties of the deposited material, the samples were pre-prepared. The samples were cut on a multifunctional cutting machine. Tribological tests of the samples were carried out on a high-temperature friction machine. The results of experimental studies of wear rate and hardness of deposited materials are presented. A regression model has been developed to describe the influence of refractory components on the wear resistance of the deposited material. Based on the results of the study of the optimal ratio of the chemical composition of the refractory components of flux-cored wire on the wear resistance of the deposited material, further directions for research into the optimal ratio of the refractory components were formulated.