are considered for these trials. The other parameters are employed only for a short duration and hence are less significant and are maintained at levels specified by the manufacturer (similar to that of the trials 20 and 21). The design matrix with two levels of I2 current and five levels of T3 arc heating time are shown
in Table 4. The specimens welded as per the parameter settings provided in Table 4 for each trial are then tested for mechanical strength of the weld (discussed in following section). The surface