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

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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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Acknowledgments

Authors are grateful to Central Instrumentation Facility of Indian Institute of Technology Guwahati for providing the testing facility.

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  1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781 039, India

    Bappa Das, Biranchi N. Panda & Uday S. Dixit

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Das, B., Panda, B.N. & Dixit, U.S. Microstructure and Mechanical Properties of ER70S-6 Alloy Cladding on Aluminum Using a Cold Metal Transfer Process. J. of Materi Eng and Perform 31, 9385–9398 (2022). https://doi.org/10.1007/s11665-022-06937-8

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