• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2019, Volume: 12, Issue: 42, Pages: 1-8

Original Article

Microstructure and Mechanical Properties of Cold Metal Transfer Welding AA6082-T4 Alloys


Objectives/methods: Robot-assisted cold metal transfer (CMT) welding is being a relatively innovative method for joining metal which can be used in automotive industry, shipbuilding industry, aerospace, and many more to join similar and dissimilar metals. CMT welding was carried out on similar 5 mm thick AA6082-T4 alloy metal with 1.2 mm diameter ER5356 electrode wire as the filler metal. This work was focused on the results of the welding speed on the microstructure and mechanical properties of welded joints. Three welding speed 10, 15, and 20 mm/s, respectively had chosen. The ASTM E8M-04 standard was used in order to cut all the welded specimens to analyse the tensile strength and the elongation of the welded joints. The hardness of the welded joints on the specimen was measured by using the Vickers microhardness testing machine. Scanning electron microscopy (SEM) was used to analyse the morphology of the surface and failure pattern of the tensile tested specimens. Findings/application: Results showed that CMT welding provides better welding joint efficiency with increasing in the welding speed, excellent tensile strength, and superior ductility.
Keywords: Microstructure, Hardness, CMT Welding, Strength


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