Selection Of Optimum Process Parameters Of Shielded Metal Arc Welding (SMAW) To Weld Steel Pipes By Design Of Experiments

The focus of this work is to design parameters for shielded metal arc welding to ensure continuous and leak proof joints. To achieve the object an attempt has been made to selected important welding parameters. The selected welding parameters are welding current, welding speed, electrode angle and electrode angle. The selection is purely based on field expert’s suggestions, literature Survey and on Scientific reasons. On the selected parameters, trails runs have been conducted and fixed the higher levels and lower levels for the parameters. Further, for each parameter 3 different levels are fixed. So that the experiment have become 4 parameters (factors) and each with 3 levels. Based on this, L9 (3 4 ) Orthogonal Array (O.A) is selected. Experiments are conducted according to O.A and results are obtained. The results have indicated that a leak proof joints can be produced in few specific operating conditions. Under these conditions effects of noise are nullified. The contribution of each parameter towards the leak is also estimated by ANOVA computations.