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Tareq Rahman Mahmood et al. / Procedia Structural Integrity 9 (2018) 71–85 Tareq RahmanM ood, et al. / Structural Integr ty P o edi 00 (2018) 00 –000

Fig. 18. Interaction between welding current and electrode force for 0.7 mm low carbon steel sheet.

5. Conclusions The regression analysis reveals that there is a non-linear relationship between the welding parameters and the tensile shear strength in RSW joints. The three-level factorial technique (welding time, welding current, electrode force) can be employed easily for developing mathematical models for predicting weld-quality and optimized parameter in the resistance spot welding. The effects of welding parameters and their interactions on the tensile shear strength were analysed. This can provide a beneficial reference for the RSW process of low carbon steel sheets and high strength low alloy steel sheet. The proposed RSM was an effective tool for modelling the complex relationship between the process parameters in spot welding case. Acknowledgements Support from Mechanical Department in Baghdad University, and Baghdad Technical College is gratefully appreciated The authors appreciated the support from SSAB Swedish steel GmbH, Mr. Philipp Wuellner the Technical Development Manager Automotive for providing the steel sheets. References Al-Mukhtar, A.M., Biermann, H., Henkel, S., Hübner, P. 2010. Comparison of the Stress Intensity Factor of Load-Carrying Cruciform Welded Joints with Different Geometries. Journal of Materials Engineering and Performance 19(6), 802–809. Al-Mukhtar, A.M. 2002. Spot Welding Efficiency and It ’ S Effect on Structural Strength of Gas Generator and Its Performance. Baghdad University. Al-Mukhtar, A. M., Henkel, S., Biermann, H., Hübner, P. 2009. A Finite Element Calculation of Stress Intensity Factors of Cruciform and Butt Welded Joints for Some Geometrical Parameters. Jordan Journal of Mechanical and Industrial Engineering 3(4), 236–45. Al Mukhtar, A.M., Biermann, H., Huebner, P., Henkel, S. 2009. Fatigue Crack Propagation Life Calculation in Welded Joints. International Conference on CRACK PATHS 2009, 391–97. Al-Mukhtar, A. M., Biermann, H., Henkel, S., Hübner, P. 2010. Determination of Some Parameters for Fatigue Life in Welded Joints Using Fracture Mechanics Method. Journal of Materials Engineering and Performance 19(9), 1225–34. Al-Mukhtar, A.M. 2011. Fracture Mechanics Method of Welded Components under Cyclic Loads: Fatigue Life Calculations and Simulation. Südwestdeutscher Verlag für Hochschulschriften.