Repair welding of 6082-T6 aluminum alloy through MIG and TIG processes
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Abstract
In this study, the 6082-T6 aluminum alloy was repaired by Metal Inert Gas (MIG) and Tungsten Inert Gas (TIG) welding using the filler ER 4043. The influences of thermal heat cycles on the microstructure and mechanical properties of weldments produced by different welding processes were assessed based on macrostructure, microstructure, tensile and micro-hardness tests. The experimental results revealed that the tensile strengths of the TIG and MIG welded joints were 199.6 MPa and 172.2 MPa, respectively, which were reduced after repair welding to 178.9 MPa and 168.1 MPa, respectively. The tensile strength of TIG welded joints were lower than those of MIG welded joints due to the lower hardness in the heat-affected zones (HAZs) due to high TIG heat input. The tensile strength was decreased after repair welding irrespective of the welding processes due to the double over-ageing effect in the over-ageing zones. These results suggest that MIG welding process should be preferred for the repair welding of 6082-T6 aluminum alloy.
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