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Effect of External Heat Assistance on the Weld Quality of AA2024 Aluminium Alloy During Friction Stir Welding
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Friction Stir Welding is one of the advanced and efficient methods to join aluminium alloys. The efforts to increase its productivity may sometimes lead to defective welds. Because, the increased welding speed may result in lesser heat input, inferior material flow and voids. To overcome this, external heat assistance can be provided to the FSW operation. This preheating of the material before it comes in contact with the FSW tool ensures better softening and material flow. In this work, external heat assistance was given with the help of a TIG during the FSW of 3mm thick AA2024. The FSW without TIG heat assistance resulted in defect formation, whereas the TIG-assisted FSW gave a defect-free weld; increase in the tensile strength, ductility and hardness at SZ by 25.8%, 47.57% and 24%, respectively. This external heat assistance boosts the productivity and might broaden the parameter window of this process.
Keywords
Friction Stir Welding, TIG Preheating, Heat Assisted Friction Stir Welding (HAFSW), 2024 Aluminium Alloy, Defect Elimination.
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