PSI- Issue 9

Tareq Rahman Mahmood et al. / Procedia Structural Integrity 9 (2018) 71–85 Tareq rahman mahmood , et al./ Structural Integrity Procedia 00 (2018) 000–000

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Fig.12. Plot of actual input experiment data and predicted design expert best linear fit.

The equation in terms of actual factors can be used to make predictions about the response for given levels of each factor is:         2 3 6 . 67.157 1.355 10 0.0195 1.1297 1.230375 10 T S F I T I           (3) Numerical optimization will search the design space, using the models created during analysis to find factor settings that meet the defined goals. The goal is maximum load in tensile test with optimized parameter so the software predicted parameter for this state (F=1953 N), (I=8095 Amp.), (T=40 cycle) the predicted output tensile strength is 10.4193 KN so when welding in this parameter the result tensile strength as same as predicted, see Figs. 14, and 13. The electrode force and welding current effect is shown in Fig.14.

Fig. 13. Interaction between electrode force and welding current