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Journal of Materials Engineering and Performance

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02-05-2022 | Technical Article

Microstructure and Mechanical Properties of ER70S-6 Alloy Cladding on Aluminum Using a Cold Metal Transfer Process

Authors: Bappa Das, Biranchi N. Panda, Uday S. Dixit

Published in: Journal of Materials Engineering and Performance | Issue 11/2022

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Abstract

Cold metal transfer (CMT) process is a type of gas metal arc welding with low heat input. This work studies microstructural, mechanical and tribological properties of ER70S-6 cladding layer on AA 6061-T6 substrate using CMT technology. Optimum process parameters were identified through visual examination. Further study was carried out with the optimized parameters. The microstructures at the substrate–cladding interface were observed using optical and field emission electron microscopy. The microstructural observations revealed the formation of equiaxed, columnar and dendritic grain structures due to directional solidification. In general, the cladding layer was free of cracks and porosity. The maximum hardness of 235 HV was observed in the cladding layer compared to 88 HV in the substrate. For the chosen experimental conditions, the minimum mean wear depth and coefficient of friction of 37 µm and 0.23, respectively, were observed in the cladded sample; corresponding values for substrate were 75 µm and 0.29. Improved equivalent yield strength of 300 MPa for the cladded sample was observed, compared to 236 MPa in the as-received sample. The average bond shear strength between the cladding layer and substrate was found to be 74 MPa, which is indicative of a good metallurgical bond.

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Title: Microstructure and Mechanical Properties of ER70S-6 Alloy Cladding on Aluminum Using a Cold Metal Transfer Process
Authors: Bappa Das
Biranchi N. Panda
Uday S. Dixit
Publication date: 02-05-2022
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 11/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-022-06937-8

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