The Effect of GTAW Process Parameters for Dissimilar Metals Steel Armour and ASS 304L Using ER316L Filler on Mechanical Properties

The effect of welding parameters on the mechanical properties of weld joints of dissimilar metals (dissimilar metals) between Armour steel and ASS 304L stainless steel greatly affects the quality of the welds. This research was carried out by the GTAW process with a variation of the welding current at 100, 110, and 120 A. Mechanical properties of welded joints were analysed including tensile testing and hardness testing, to determine the strength of the welded joint and the distribution of hardness in the heat-affected area (HAZ). The highest hardness test value was found in the 110 A specimen, which is 527.6 HV in the HAZ Armour area, and there is a correlation to the tensile test results that the fracture occurs in the area of low hardness. The results of the highest tensile strength test were found in the 110 A current specimen at 626,154 MPa with a yield strength of 406.779 MPa. The fractures for all specimens occurred in the fusion line region towards ASS 304L. The welding parameters appropriate for welding dissimilar steel between Armour steel and ASS 304L can be used as a reference for welding military transformation tools and reducing production costs.