Improving the quality of melted metal during the restoration of the working surface of the press tool
DOI:
https://doi.org/10.37142/2076-2151/2024-1(53)188Keywords:
: deforming tool, self-shielded powder wire, non-metallic inclusions, gas saturation of deposited metal, the gas slag-forming component of the flux-cored wire.Abstract
Grin O., Zharikov S.
Improving the quality of melted metal during the restoration of the working surface of the press tool
The analysis of literature data showed that the reliability and efficiency of forging and press production depends on the stability of the deforming tool, the improvement of which is of great technical and economic importance. One of the ways to increase stability is strengthening and restorative surfacing of the working tool with self-shielded flux-cored wire (SFW). One of the disadvantages of SFW is the formation of pores and non-metallic inclusions caused by nitrogen in the deposited metal, the amount of which depends on the effectiveness of the protection of the liquid metal. Gas saturation and the quality of the deposited metal are affected by the gas slag-forming part of the flux-cored wire core. Therefore, an urgent issue is the study of the influence of SFW components on nitrogen and nitride saturation of the molten metal. The saturation of the molten metal with gases occurs both in drops and in the welding bath. When studying the influence of the sheath steel grade on the gas saturation of the deposited metal and the content of non-metallic inclusions, it was found that for SFW sheaths made of 08кп, 08пс, 09Г2 steels, the minimum number of non-metallic inclusions is formed when using a wire with a 09Г2 sheath, while also establishing a minimum solubility of gases in the deposited metal. The analysis of the effect of the gas-slag-forming component of the flux-cored wire on the nitrogen content in the welded metal showed that the ratio of the components: fluorspar CaF2, rutile concentrate TiO2, marble CaCO3 significantly affects the solubility of nitrogen in the weld metal. Based on the results of our research, a mathematical model was obtained that can be used in the optimization of the gas slag-forming part of self-shielded flux cored wires, during the melting of which slags of the main character of the CaO - CaF2 - TiO2 system are formed.deforming tool, self-shielded powder wire, non-metallic inclusions, gas saturation of deposited metal, the gas slag-forming component of the flux-cored wire.
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