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The shoulder of friction stir welding tool influences properties of welded or processed zone from appearance to internal microstructural features. The main function of the tool shoulder is the control of work piece material towards the probe by rotational flow generated by the tool and the force distribution under the shoulder generating required temperature and hydrostatic pressure to ensure proper containment and consolidation in forming defect free weld. The efficiency of the shoulder in this regard may be evaluated by the surface appearance and uniformity of the weld bead. In the present study, the images of weld bead surface of friction stir welded specimens produced using different process parameters is analyzed using image processing technique. The images are digitally processed and analyzed by defining suitable region of interest along good and defect weld region based on X-Ray radiography results of friction stir welded specimens. The line profile plot along the weld line and contour plot of weld bead images are plotted using MATLAB. The variation in the slope of line profile plot and appearance in the contour plot along good and defect weld regions are observed which enables to assess the quality of weld using image processing. Keywords -Contouring, Digital image processing, Friction stir welding, Profiling, X-Ray radiography

Digital Image Processing Of Friction Stir Weld Bead Surface Using Profiling and Contouring For Weld Quality Assessment