EFFECTS OF POST WELD HEAT-TREATMENT ON MICROSTRUCTURE AND MECHANICAL BEHAVIOR OF DIS-SIMILAR MATERIALS PRODUCED BY GTAW PROCESS

Abstract

Welding is a well-known economic fabrication process in that GTAW is one of the reliable and easy weld techniques compared with other fabrication techniques. The present research focused on the dissimilar metal welds, a weldment between ferrous and non-ferrous alloys taken into consideration. A part of experimental work, AA6061 with Ferrous alloys like EN8, SS302, SS316 welded with TIG welding process known as GTAW. Aluma steel filler rods are used for the weldment in a twostep process; the primary rod is used to fill the ferrous side, and the second filler is used to join them both. The structures for different samples of post welded joints to check the structural variation between all 3-zones, basemetal, Heat affected zone (HAZ), and weld zone using optical microscopy and scanning electron microscopy (SEM). The investigation further continued to check the mechanical properties of weld structures tensile and hardness. Hardness testing has been carried out like structures in 3- zones to check the hardness variation in HAZ and weldment. The results obtained are satisfactory based on weld strength and structures obtained in the sample analysis.