*Quality Control - Intelligent Manufacturing, Robust Design and Charts*

**Table 11.** *Orthogonal Array L25 (Minitab18).*

### **4.7 Confirmatory test for bead width**

After evaluating the optimal parameter settings, the next step is to predict and verify the quality performance characteristics using the optimal parametric combination. The predicted value of the bead width is estimated by using the Eq. (2). Five experiments are conducted at the optimum parameter. The result of predicted value and experimental value of bead width is shown in **Table 19**, and it represents that predicted value and experimental value are close to each other [9].

$$
\eta = n\_m + \sum\_{i=0}^{0} n\_{im} - n\_m \tag{2}
$$

where, η – predicted value *nm* - is the total mean


### *Application of Taguchi Method in Optimization of Pulsed TIG Welding Process Parameter DOI: http://dx.doi.org/10.5772/intechopen.93974*
