Anowa, H.D, Achebo, J.I, Ozigagun .A and Etin-osa, E.C, Nigeria
Viscosity is an important property of liquid metals during welding because it controls the rate of transport of liquid metals, which may lead to weld defects such as cracks, porosity etc., which greatly affects weld quality. This study was carried out with the aim of optimizing and predicting the weld molten metal fluidity of weldment. Mild steel plate was cut into dimension 60mmx40mmx10mm with a power hacksaw, grinded and cleaned before the welding process. The experimental matrix was made of twenty (20) runs, generated by the design expert 7.01 software adopting the central composite design. The result obtained in this research study shows that a high viscosity produces weldment with better structural integrity. The model produced numerical optimal solution of current 150 amps, voltage of 20 volts and gas flow rate of 17l/min will produce a welded structure having kinematic viscosity of 1.179m2/s at a desirability value of 94.6%.