Boyko I. Improving of self-shielded flux-cored wire for surfacing of tool for hot copper alloys pressing

The object of study - the process of hardening of hot pressing tool for copper alloys by self-shielded flux-cored wire surfacing. Purpose - to improve the self-shielded flux-cored wire for surfacing of hot pressing tool for copper-based alloys. Research methods - project method that determines the integrity of the research stage and the procedure for developing self-shielded flux-cored wire; empirical method associated with the production of experimental evidence supporting the causes of failure of press tools and statistical methods of experimental design used to find optimal solutions for the creation of a new self-shielded flux-cored wire for surfacing pressing tool. Novelty - - Developed a methodology for determining the durability of the tool during its interaction with pressed copper alloy to ensure the reliability of quantitative evaluation in comparison with existing ones; obtained new data on the use of strip steel 65G as shell material Self-cored wire. Found that wire drawing with tape 65G does not lead to heating above the temperature of the wire shell 470 0C, which does not lead to dissociation of the core components increase with increasing strain rate in 1.2-1.3 times; found that the use of shell wire with tape 65G eliminates graphite from the core SAP, providing conversion of carbon in the weld metal shell in the amount of 0.38 ... 0.42%. Developed wire arrangement provides the content of nonmetallic inclusions in the weld metal to a level of 0.2 ... 0.25%, and the average size of less than 2.5 ... 3.5 microns, which enhances the durability of the deposited layer; t is shown that the surface roughness of the shell wire with tape 65G after drawing to a diameter of 2.5 ... 3 mm. Less than steel 08kp, improves stability regimes arc process and expand the range of operating modes of surfacing: voltage to 22 23 ... with welding current 190 ... 290 A.