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    An Optimization Study on Resistance Spot Welding of DP600 Sheet Steel via Experiment and Statistical Analysis
    (Eos Assoc, 2023) Alzahougi, Abdulkarim; Demir, Bilge; Elitas, Muhammed
    Resistance Spot Welding (RSW) is widely used in many automotive, boiler, and ship manufacturing industries. Therefore, the optimization and effectiveness of the RSW process are very useful and cost-efficient processes in addition to improving weld quality. This study used various welding parameters to investigate the optimization of the RSW process of Advanced High Strength Steel (AHSS). RSW was carried out using different welding times, currents, and electrode pressure values. Microstructural analysis, nugget formation, and tensile shear test were performed on samples. This study applied the Taguchi method and ANOVA to set up the welding process and optimize its results. Microstructural characterization showed that the weld nugget microstructures had a high-volume fraction of martensite. Using the Minitab software, Taguchi (DOE) and ANOVA on the tensile shear test results showed that welding current is more effective than clamping pressure on the tensile shear load-bearing capacity (TLBC). However, clamping pressure affects the weld current effects on weld performance. Additionally, the TLBC of RSW samples increases, whereas increasing the clamping pressure leads to a decrease in TLBC and nugget dimensions. Consequently, a detailed analysis of the RSW coefficients and their effects led to optimized results.
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    RSW Junctions of Advanced Automotive Sheet Steel by Using Different Electrode Pressures
    (Eos Assoc, 2018) Alzahougi, Abdulkarim; Elitas, Muhammed; Demir, Bilge
    The effects of different types of welding current and electrode pressure on tensile shear properties of resistance spot welding (RSW) of commercial DP600 steel have been investigated in this study. In tensile shear tests of the welded joints, tensile shear force and maximum displacement were utilized to characterize the performance of the welding process. Nugget diameter has been measured to create a clear definition of RSW physical properties. Experimental results show that tensile shear load bearing capacity increases as the electrode pressure increases. Low current value occurs at low and at high electrode pressures. During high current value, the material can exhibit superior mechanical properties. The effect of electrode pressure on tensile shear load bearing capacity increases as welding current increases.