Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Parametric Models and Process Map for Alternating Current Square-Waveform Welding of Heat-Resistant Steel

Version 1 : Received: 11 December 2021 / Approved: 14 December 2021 / Online: 14 December 2021 (12:46:10 CET)

How to cite: Mohany, U.K.; Abe, Y.; Fujimoto, T.; Nakatani, M.; Kitagawa, A.; Tanaka, M.; Suga, T.; Sharma, A. Parametric Models and Process Map for Alternating Current Square-Waveform Welding of Heat-Resistant Steel. Preprints 2021, 2021120234 (doi: 10.20944/preprints202112.0234.v1). Mohany, U.K.; Abe, Y.; Fujimoto, T.; Nakatani, M.; Kitagawa, A.; Tanaka, M.; Suga, T.; Sharma, A. Parametric Models and Process Map for Alternating Current Square-Waveform Welding of Heat-Resistant Steel. Preprints 2021, 2021120234 (doi: 10.20944/preprints202112.0234.v1).

Abstract

The demand for efficient processes through a comprehensive understanding and optimization of welding conditions continues to grow in the manufacturing industry. This study involves heat-resistant 2.25 Cr-1 Mo V-groove steel welding using the square-waveform alternating cur-rent. Experiments were conducted to build the relationship between input variables—such as current, frequency, electrode negativity ratio, and welding speed—and process performance, such as penetration, bay area, deposition rate, melting efficiency, percentage dilution, flux–wire ratio, and heat input. The process was analyzed in light of the defect-free high-deposition weld groove weld, the sensitivity to process parameters, and the optimization and development of the process map. The study proposes an innovative approach to reducing the cost and time of optimizing the one-pass-each-layer V-groove welding process using bead-on-plate welds. Square waveform welding creates a metallurgical notch in the form of a bay at the fusion boundary that can be minimized by selecting appropriate welding conditions. The square waveform submerged arc welding is more sensitive towards changes in current and welding speed than the frequency and electrode negativity ratio; however, the electrode negativity ratio and frequency are minor but helpful parameters to achieve optimal results. The proximity of the planned and experimental results to within 3% confirms the validity of the proposed approach. The investigation shows that 90% of the maximum deposition rate is possible for one-pass-each-layer V-groove welds within heat input and weld width constraints.

Keywords

submerged arc; heat resistant steel; square waveform welding; aggregate quality index; bay area; melting efficiency; process; model; process map

Subject

ENGINEERING, Industrial & Manufacturing Engineering

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