EFFECT OF TOOL MATERIALS ON JOINT CHARACTERISTICS OF FRICTION STIR WELDED OF AA7075-T6 ALUMINIUM ALLOY JOINTS
Keywords:
Plasma transferred arc hard facing, Friction Stir Welding, Mild steel, tensile properties , MicrostructureAbstract
In this present investigation, 6 mm thick rolled plates of AA7075-T6 aluminium alloy were used as the base material. AA7075-T6 aluminium alloy plates were friction stir butt welded using commercially available tools high carbon tool (HCS) and Super High Speed Steel (SHSS). Further in this investigation one more tools was developed using hard facing process. Tungsten carbide was used to deposit hard faced layer onto the mild steel rod by Plasma transferred arc hard facing (PTA) process. Using each tool, one joint was friction stir welded under same welding conditions. From this investigation, it is found that the joints fabricated using PTA hard faced tool yielded superior tensile properties compared to other joints. The optimum level of heat generation, formation of fine grains and higher hardness in plasticized zone are the main reasons for the superior tensile properties of these joints
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