Influence of Gas Metal Arc Welding Parameter on Lap Joint Properties of SS400 Carbon Steel and SUS304 Stainless Steel

摘要

SS400/SUS304 steels lap joint was applied in various industries due to flexible and beneficial properties of these dissimilar metals joint. Therefore, an investigation for optimization of a gas metal arc welding (GMAW) for producing the dissimilar metal lap joint should be conducted for advancing the manufacturing industries. This research applied GMAW with various currents and speeds to weld SS400/SUS304 lap joint and studied the relationship between the parameters and resuted joint properties. The experiment showed that an increase in the wedling current and a decrease in the welding speed affected to increase the fracture strength, the displacement of the lap joint, and the joint hardness due to high combination of the materials at the joint interface. The uncombined materials at the carbon steel/weld metal interface had the different hardness and resulted to initiate the crack that then was propergated until the joint was broken. The weld metal showed the formation of the finer and smaller dendrite structure with increasing the welding current and decreasing the welding speed.