Hybrid Optimization of Process Parameters in Manual Metal Arc Welding for Nanostructured Hard facing

Abstract

AISI 310 stainless steel and EN24 steel were welded together using Manual Metal Arc Welding. Minitab and Design Expert software were applied to predict and optimize the results for bead width (BW) and weld penetration (PE). Total of 30 experiments were conducted according to the Box-Behnken design in RSM. Four different welding parameters current, voltage, welding speed, and root gap were employed to examine their effects on output values. The optimal conditions for BW were determined using the SN ratio, leading to an optimal parameter combination of C1-V4-W4-R4. This combination corresponds to a current of 75A, a voltage of 18V, a welding speed of 50 mm/min, and a root gap of 3 degrees. The optimal parameter value obtained from the Design Expert software were used to find the BW and PE to evaluate the weld quality. Under the optimal conditions, the supreme BW achieved was 13.994 mm, while the extreme PE reached 4.43976 mm, indicating satisfactory weld quality.

Keywords

• aisi 310 stainless steel
• bead width
• optimization
• manual metal arc welding and design expert software