OPTIMIZATION OF RESISTANCE SPOT WELDING PARAMETERS FOR DP1180 STEEL IN AUTOMOTIVE APPLICATIONS
Abstract
This study presents a systematic investigation into the effects of primary process parameters on the mechanical strength of electrical resistance spot welded (RSW) DP1180 advanced high-strength steel sheets, a material of critical importance for automotive lightweighting. Three principal welding parameters—electrode force, welding current, and welding time—were evaluated and optimized using the Taguchi experimental design methodology. An L9 orthogonal array was employed, with three distinct levels designated for each parameter. The tensile-shear strength of the welded specimens was determined, and the corresponding signal-to-noise (S/N) ratios were calculated to identify the optimal parameter settings. A statistical analysis of variance (ANOVA) was conducted to quantify the contribution of each parameter to the joint strength. Results unequivocally identified welding current as the most influential parameter, contributing 64.13% to the variation in tensile-shear strength. Macrostructural analyses corroborated these findings, revealing that specimens with high tensile-shear strength exhibited a large, homogeneous weld nugget. Conversely, low-strength specimens were characterized by smaller nugget diameters and the presence of internal voids at the weld centerline. This work demonstrates the suitability of the RSW process for DP1180 steel by establishing an optimized parameter window, offering a clear pathway toward achieving robust and reliable joint performance in automotive manufacturing.
Keywords
References
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Details
Primary Language
English
Subjects
Automotive Engineering (Other)
Journal Section
Research Article
Authors
Publication Date
August 4, 2026
Submission Date
February 17, 2026
Acceptance Date
April 13, 2026
Published in Issue
Year 2026 Volume: 31 Number: 2