A Semi-Analytical Nonlinear Regression Approach for Weld Profile Prediction: A Case of Alternating Current Square Waveform Submerged Arc Welding of Heat Resistant Steel

Mohanty, Uttam Kumar and Sharma, Abhay and Nakatani, Mitsuyoshi and Kitagawa, Akikazu and Tanaka, Manabu and Suga, Tetsuo (2018) A Semi-Analytical Nonlinear Regression Approach for Weld Profile Prediction: A Case of Alternating Current Square Waveform Submerged Arc Welding of Heat Resistant Steel. Journal of Manufacturing Science and Engineering, 140 (11). ISSN 1087-1357

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Abstract

The complexity in weld profile caused by abrupt change in polarity in square waveform welding is investigated through the development of a model capable to accurately predict weld profile. A semi-analytical model is conceived wherein characteristic attributes of a composite parabolic-elliptic function, which represent the weld profile, are obtained through nonlinear regression (NLR). The proposed model is demonstrated for its efficacy in the prediction of weld profile over a wide range of welding parameters, vis-à-vis, welding current, frequency, electrode negative (EN) ratio, and welding velocity. The investigation suggests that the center and outer cores of welding arc remains more active during positive and negative polarity, respectively, that leads to distinct macroscopic zones in weld cross section and thus, necessitates a composite profile for representation of weld profile. The intersection of the zones forms a metallurgical notch which the investigation offers a method to estimate and thus control. Unlike the convention continuous arc welding, the waveform arc welding caters welding at higher velocity without compromising the weld penetration and almost abolishing the metallurgical notch as well.

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IITH Creators:
IITH CreatorsORCiD
Sharma, AbhayUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: bead geometry, bead shape, metallurgical notch, nonlinear regression, square waveform welding, welding process parameters
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 26 Sep 2018 04:10
Last Modified: 26 Sep 2018 04:10
URI: http://raiith.iith.ac.in/id/eprint/4456
Publisher URL: http://doi.org/10.1115/1.4040983
OA policy: http://www.sherpa.ac.uk/romeo/issn/1087-1357/
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