EFFECT OF HARDFACED TOOLS ON THE PERFORMANCE OF FRICTION STIR WELDED COPPER ALLOYS JOINTS
Keywords:
Plasma transferred arc welding, Shielded metal arc welding, Friction Stir Welding, Mild steel, Tensile properties , MicrostructureAbstract
In the present work, an attempt was made to develop high temperature wear resistant hardfaced tools for friction stir welding (FSW) of commercial grade copper alloys. Hardfacing was applied on mild steel rod using Tungsten carbide forming powder by plasma transferred arc (PTA) hardfacing process and Tungsten carbide forming consumables by Shielded metal arc hardfacing (SMA) process. Commercially available tool material high speed steel (HSS) was also used to friction stir weld copper alloy for comparison purpose. From this investigation, it is found that the PTA hardfaced tool yielded defect free joints without tool wear compared to other tools. The optimum level of heat generation, formation of finer grains and higher hardness of stir zone are main reasons for the superior tensile properties of the joints fabricated by PTA hardfaced tungsten carbide tools.
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