TY - JOUR
T1 - Empirical Modelling of a Prototype Resistance Spot Welding Machine
AU - Ozoegwu, C. G.
AU - Oti, C. N.
AU - Okokpujie, I. P.
AU - Akinlabi, E. T.
N1 - Funding Information:
The authors hereby acknowledge the management of Covenant University for their financial support for open access publication.
Publisher Copyright:
© 2019 IOP Publishing Ltd.
PY - 2019/12/18
Y1 - 2019/12/18
N2 - Resistance spot welding (RSW) has been extensively used in the automotive and aerospace industries over the years. The weld quality of spot welds is affected by the welding parameters like electrode force, weld time, electrode current and workpiece size/shape parameters like workpiece thickness. This study focuses on the effect of electrode force, weld time and workpiece thickness on the weld quality of mild steel samples where the aim is to correlate the weld strength to welding parameters of a portable RSW machine installed at the Nigerian Liquefied Natural Gas (NLNG) laboratory of the Department of Mechanical Engineering, University of Nigeria, Nsukka. Lap shear weld samples are tested for strength, and the results are used to develop an empirical model. The developed model has a coefficient of determination of 0.6365 and a correlation coefficient of 0.7978. Hypothesis testing at 5% significance level discovered that the most significant predictor is the cross interaction of the workpiece thickness and electrode force with p-value of 0.02367 and that the model is significant with a p-value = 0.0453. The model is validated by further welding operations and tensile shear tests which gave a percentage error not exceeding 12.92% but was as low as 6.35%.
AB - Resistance spot welding (RSW) has been extensively used in the automotive and aerospace industries over the years. The weld quality of spot welds is affected by the welding parameters like electrode force, weld time, electrode current and workpiece size/shape parameters like workpiece thickness. This study focuses on the effect of electrode force, weld time and workpiece thickness on the weld quality of mild steel samples where the aim is to correlate the weld strength to welding parameters of a portable RSW machine installed at the Nigerian Liquefied Natural Gas (NLNG) laboratory of the Department of Mechanical Engineering, University of Nigeria, Nsukka. Lap shear weld samples are tested for strength, and the results are used to develop an empirical model. The developed model has a coefficient of determination of 0.6365 and a correlation coefficient of 0.7978. Hypothesis testing at 5% significance level discovered that the most significant predictor is the cross interaction of the workpiece thickness and electrode force with p-value of 0.02367 and that the model is significant with a p-value = 0.0453. The model is validated by further welding operations and tensile shear tests which gave a percentage error not exceeding 12.92% but was as low as 6.35%.
KW - central composite design
KW - resistance spot welding
KW - statistical regression
KW - tensile shear test
KW - weld nugget
KW - weld strength
UR - http://www.scopus.com/inward/record.url?scp=85077774680&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1378/3/032101
DO - 10.1088/1742-6596/1378/3/032101
M3 - Conference article
AN - SCOPUS:85077774680
SN - 1742-6588
VL - 1378
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 3
M1 - 032101
T2 - 3rd International Conference on Engineering for Sustainable World, ICESW 2019
Y2 - 3 July 2019 through 8 July 2019
ER -