Effect of High-Melting Components on the Wear Resistance of the Surfacing Material

The study objective is to study the wear resistance of surfacing materials. The task to which the paper is devoted is to increase the inter-repair operation period of gravity roll carrier elements operating in harsh conditions. A method is presented for restoring worn parts by electrode surfacing with flux cored wire with high-melting components under a layer of flux. It is known that when high-melting components such as tungsten (W), tungsten carbide (WC) and boron nitride (BNg) are added to the charge, the hardness and wear resistance of the restored surfaces increase. For surfacing the experimental samples, substrates made of steel grade 30HGSA GOST 4543-2016 with a diameter of 80 mm and a thickness of 20 mm are used. The samples are deposited in the laboratory for the restoration and hardening of mining and metallurgical equipment parts at NUST MISIS. The surfacing is carried out under a layer of keramax UF-02 grade flux. Thermal treatment is performed to relieve the internal stresses of the samples. The samples are cut on a multifunctional cutting machine. Further, the samples are subjected to abrasion by abrasive wear and abrasion under sliding friction conditions on special laboratory installations. The method of testing for abrasive wear and abrasion under sliding friction conditions is described. The novelty of the work is in the study of the wear resistance of experimental surfacing materials when worn under conditions of sliding friction and abrasive wear, and their comparison with hardness. The results of experimental studies of abrasive wear and abrasion under sliding friction conditions of deposited materials are presented. Conclusions are given for each studied material. Conclusions: based on the test results, further directions have been formulated for the study of surfacing materials for machinability by cutting, with the subsequent determination of the rational ratio of high-melting components of flux cored wire.