Analysis of Banded Texture of Friction Stir Weld Bead Surface by Image Processing Technique

Abstract:- The tool shoulder of friction stir welding is considered to be one of the prime element which controls the material flow and heat input, generating required temperature and hydrostatic pressure along the weld line in producing a defect-free weld. The interaction of tool shoulder with base material in the formation of friction stir weld is studied by analyzing the banded texture of weld bead surface using image processing techniques, since the textures form an important clue for the recognition of surface. Experiments are carried out by capturing the images of weld bead surface of friction stir welded specimens produced using different process parameters. 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 to determine first order and second order statistical textural parameters of weld bead surface using MATLAB. The variation in the textural parameters along good and defect weld regions are observed which enables to assess the quality of friction stir weld using image processing. Keywords:- Friction stir welding, Image processing, Statistical textural parameters, X-Ray radiography I

Optimization for Tensile Strength of Sisal Fiber, Glass Fiber and Alumina- Based Hybrid Composite using Taguchi Technique

Natural fibers composite play an important role in making eco-friendly products. The present investigation has been made to find tensile strength of hybrid composites fabricated using optimal composition of sisal fiber, glass fiber and alumina. Multi-response optimization has been carried out. The compositions of reinforcements namely sisal fiber, glass fiber and alumina in hybrid composite were prepared by Hand-layup technique. Sisal fiber of 20 Wt.%, 30 Wt.% and 40 Wt.% are chopped into 10mm length, Glass fiber of 20 Wt.%, 30 Wt.% and 40 Wt.% are 10mm length and alumina particles of 2Wt.%, 3 Wt.% and 4 Wt.% are compositions of reinforcement were chosen according to orthogonal array as Taguchi technique(L9). The results have been verified through confirmatory experiments. Experimentations were carried out with the different composition based on L9 process parameters. Based on the experimental observations the maximum ultimate tensile strength was found to be 37.87 MPa for optimised input parameters as 20% of sisal fiber, 30% of glass fiber and 3% of alumina.</jats:p