INVESTIGATION OF TIG WELDING ON DISSIMILAR METERIALS USING NON DESTRUCTIVE TESTING (NDT) AND RADIOGRAPHY TESTING (RT)

Manufacturing Engineering

Aluminum, Copper and mild steels are popular materials in industrial and constructional applications. Of late, joining of these metals with lesser defects and higher strength is gaining more and more importance. Welding is an efficient way of joining two metals in order to get a high strength and permanent joint. In the current work, an investigation is carried out to study the effect of TIG (Tungsten Inert Gas) welding processes, when Aluminum is welded with mild steel. The scope of the current work also includes, when Copper is welded with mild steel investigating the effect of filler material on weld quality, strength and hardness of the joint by silicon bronze and Copper Filler materials are used. Further, micro structural analysis using Non-destructive Testing, Porosity analysis using Radiography Testing and Analysis of Mechanical properties is also taken up on the weld zone to study the quality of the joint. It was observed that a satisfactory bonding for steels can be achieved by TIG welding processes. However higher strength and superior quality joint can be achieved with TIG welding process using silicon bronze as filler metal.

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