Department of Mechanical Engineering, Vasavi college of Engineering, Ibrahim Bagh, Hyderabad, 500 031, India.
Research on welding of materials like Aluminum alloys is still critical and ongoing. An attempt has been made to analyze the effect of process parameters in qualitative manner for welding of Aluminum alloy (AA 6351) using Gas Shielded Metal Arc Welding (TIG). Taguchi's method is used to formulate the experimental layout. Exhaustive survey suggest that 5–7 control factors viz, arc voltage, arc current, welding speed, nozzle to work distance and gas pressure predominantly influence weld quality, even plate thickness and backing plate too have their own effect. Design of experiments based on orthogonal array is employed to develop the weldments. The weldments are subjected to testing to find the qualitative properties. The data obtained is checked for adequacy based on ANOVA. The result computed is in form of contribution from each parameter, through which optimal parameters are identified for minimum defects. The data in the present work is collected using Ultrasound Testing (UT), in which angle beam technique is adopted for the testing of weldments and results are quantified accordingly. The testing of specimens indicated, the presence of defects like LOP, LOF, Blowhole, and Cracks
AA 6351, TIG, Taguchi method, ANOVA, Ultra sound testing
