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Investigation on Microstructure and Mechanical Properties of Gas Metal Arc Welded Dissimilar Aluminium Alloys


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DOI: https://doi.org/10.15866/ireme.v13i2.15829

Abstract


Aluminium alloys are widely used as an alternative to steel in the marine, automobile and other industries because of their weight-to-strength ratio and good corrosion resistance. Dissimilar welding of 5x and 6x aluminium alloys series is important in many industrial applications; however, the dissimilar joining of heat treatable and non-heat treatable Al alloys can result in significant strength reduction and inadmissible weld discontinuities. This study investigates the dissimilar joining of AA 5083-H111 to AA 6082 with two-filler wires, AA5183 and AA5356, using pulsed current and constant current gas metal arc welding processes. The microstructure is investigated using optical microscopy and the hardness of different weld regions is measured with the Vickers hardness test. Analysis of the results showed defect formation such as porosity and lack of fusion due to entrapment of hydrogen. Moreover, more coarse columnar structures were formed with constant current gas metal arc welding process than pulsed current gas metal arc welding. The measured hardness in the weld region of the joints was similar for both filler wires of the respective gas metal arc welding process variants. However, joint hardness varied in the heat affected zone depending on the filler metal used. Further research is required on intermetallic compound formation and its effect on weld properties as well as optimum welding parameters for distortion-free welding.
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Keywords


AA5083-H111 Al Alloy; AA6082 Al Alloy; Constant Current; Dissimilar GMAW; Pulsed Current

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