Defect Analysis of Resistance Spot Welding Results Using Fault Tree Analysis and Comparison of Optimizing Parameter in the Process of Spot Welding Process Using Taguchi Techniques and Response Surface Methodology in PT X

The quality of a product depends on the production process, one of them is resistance spot welding process. Defect is named for the products that failed to fulfill the company’s standard. There are 2 causes of defect, no nugget diameter on spot welding and spot welding crack. These 2 causes of defect will be analyzed using fault tree analysis. To reduce the amount of defect on resistance spot welding process, therefore parameter optimization is done by using 2 parameter optimization methods namely, Taguchi Technique and Response Surface Methodology. Parameter optimization focus on 3 parameters is, welding current (kA), welding time (cycle), and electrode force (kN). Based on Taguchi Technique, the optimal parameters are 8,7 kA on welding current, 18 cycles on welding time, and 1,6 kN on electrode force. Meanwhile, Response Surface Methodology are 8,7 kA on welding current, 19 cycles on welding time, and 1,6 kN on electrode force. The differences between the both methods are cost, time based on the number of runs orders, and how it processed.