Stressed State of Chrome Parts During Diamond Burnishing

Bembenek, Michał; Kopei, Volodymyr; Ropyak, Lіubomyr; Levchuk, K. G.

doi:10.15407/mfint.45.02.0239

Cited by 4 publications

(2 citation statements)

References 55 publications

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“…The characteristics of the arc and plasma composition [112] will affect weld bead morphology [61,113], cooling conditions [114], as well as the thermo-stressed state [115][116][117], its microstructure [118], mechanical properties [119][120][121][122][123][124][125], and operational properties [126][127][128][129][130].…”

Section: Discussionmentioning

confidence: 99%

Effect of Exothermic Additions in Core Filler on Arc Stability and Microstructure during Self-Shielded, Flux-Cored Arc Welding

Lozynskyi,

Trembach,

Katinas

et al. 2024

Crystals

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In the conditions of an energy crisis, an important issue is the increase in energy efficiency and productivity of welding and hardfacing processes. The article substantiates the perspective of using exothermic additives introduced into core filler for flux-cored wire arc welding processes as a relatively cheap additional heat source, reducing energy consumption when melting filler materials, and increasing the deposition rate. The mixture design (MD) was selected as the design method to optimize the average values of current and voltage, as well as arc stability parameters depending on core filler composition. This article studies the influence of the introduction of exothermic addition (EA), as well as the ratios CuO/C and CuO/Al on arc stability for the FCAW S process. Parameters characterizing arc stability were determined using an oscillograph, and from the obtained oscillograms, an analysis was conducted on arc voltage and welding current signals during flux-cored arc welding. It was determined that various methods can be used to evaluate arc stability, which can be divided into two groups: graphical (current and voltage cyclograms, box plots with frequency histograms, ellipse parameters plotted on current, and voltage cyclograms) and statistical (standard variation and coefficients of variation for welding current and arc voltage). In this paper, a comprehensive evaluation of arc stability depending on the composition of the cored wire filler was carried out. It was determined that the most stable current parameters were observed for the flux-cored wire electrode with an average exothermic addition content at the level of EA = 26.5–28.58 wt.% and a high carbon content (low values of CuO/C = 3.75). Conversely, the lowest values of arc stability (CV(U) and Std(U)) were observed during hardfacing with a flux-cored wire electrode with a high CuO/Al ratio ≥ 4.5 and a content of exothermic addition in the core filler below the average EA < 29 wt.%. Mathematical models of mean values, standard deviation, coefficient of variation for welding current, and arc voltage were developed. The results indicated that the response surface prediction models had good accuracy and prediction ability. The developed mathematical models showed that the ratio of oxidizing agent to reducing agent in the composition of exothermic addition (CuO/Al) had the greatest influence on the welding current and arc voltage characteristics under investigation. The percentage of exothermic mixture in the core filler (EA) only affected the average welding current (Iaw) and the average arc voltage (Uaw). The graphite content expressed through the CuO/C ratio had a significant impact on welding current parameters as well as the coefficient of variation of arc voltage (CV(U)). Two welding parameters were selected for optimization: the mean welding current (Iaw) and the standard deviation of arc voltage (Std(U)). The best arc stability when using exothermic addition CuO-Al in the core filler was observed at CuO/Al = 3.6–3.9, CuO/C = 3.5–4.26, and at an average EA content of 29–38 wt.%. The significant influence of the CuO/Al and CuO/C ratios on arc voltage parameters can also be explained by their impact on the elemental composition of the welding arc (copper, cupric oxide (CuO), and Al2O3). The more complete this reaction, the higher the amount of easily vaporized copper (Cu) in the arc plasma, enhancing arc stability. The influence of core filler composition on the microstructure of deposited metal of the Fe-Cr-Cu-Ti alloy system was investigated.

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Section: Discussionmentioning

confidence: 99%

Effect of Exothermic Additions in Core Filler on Arc Stability and Microstructure during Self-Shielded, Flux-Cored Arc Welding

Lozynskyi,

Trembach,

Katinas

et al. 2024

Crystals

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“…Usually, a high temperature in the cutting zone depends on many factors e.g. material, toll, tool cover [28] and what is not desirable can change the microstructure of the steel [29,30] and the surface layer hardness [31]. This effect can be reduced, e.g.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Thermal Analysis of Two Workpiece Materials of Different Machinability When Turning Based on Ir Thermography

Uhryński,

Nurkusheva,

Usserbayev

et al. 2024

Journal of Machine Engineering

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The comparative thermography analysis of temperature during machining by turning was presented. For the tests cast iron EN-GJL 250 and stainless steel 1.4301 were used. The machining by turning was performed with the TNMG 220408HS PC9030 and TNMA 220208 NC6210 cutting inserts design for machining that kind of materials. The temperature was measured on the machined material and on the surface of the cutting insert. The temperature distribution was performed during 3 subsequent turning passes; therefore, the coolant was not used during machining. The emissivity of TNMG 220408HS PC9030 and TNMA 220208 NC6210 cutting inserts was performed. In the case of EN-GJL-250 cast iron, the tests have shown that due to safety reasons (the lack of the safety cover in the working area of the lathe) it was impossible to perform the measurements at the highest assumed machining speed of 339.1 m/min. The higher average temperatures in the material were recorded for 1.4301 steel, even though the machining process was performed at a much lower machining speed than in the case of EN-GJL-250 cast iron. The average cutting insert temperature when turning EN-GJL-250 cast iron was approximately 100°C higher than for 1.4301 steel.

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Design of the Technological Route for Sustainable Machining of Functional Surfaces for Automotive Engineering Parts

Kusyi,

Kusen,

Slipchuk

et al. 2024

Lecture Notes in Mechanical Engineering

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Stressed State of Chrome Parts During Diamond Burnishing

Cited by 4 publications

References 55 publications

Effect of Exothermic Additions in Core Filler on Arc Stability and Microstructure during Self-Shielded, Flux-Cored Arc Welding

Effect of Exothermic Additions in Core Filler on Arc Stability and Microstructure during Self-Shielded, Flux-Cored Arc Welding

A Comparative Thermal Analysis of Two Workpiece Materials of Different Machinability When Turning Based on Ir Thermography

Design of the Technological Route for Sustainable Machining of Functional Surfaces for Automotive Engineering Parts

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