Abstract
The objective of present work is to analyze the role of tool offset on mechanical properties of Friction Stir welded (dissimilar materials) AA7XXX and Steel joints. The major process parameters opted for current experimental study are, Tool Offset (T-OF), Tool Rotation Speed (TRS), and Tool Travel Speed (TTS). Tungsten Carbide (K-12) tool with cylindrical tapered pin is used to produce dissimilar butt welds. Steel plate is kept on advancing side and aluminum on retreating side during the joining process. Tensile, Impact, Bending and Hardness analysis are performed to assess the joint strength. Vickers Micro-hardness test was done along transverse direction of the joint to obtain hardness distribution at weld nugget. Experimental study divulge that, at tool rotational speed of 1400 rpm, tool travel speed of 16 mm/min and offset of +1 mm towards steel (advancing side) yields better results, i.e. around 23.3% improvement as compared to tool at zero offset.
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