Pulsed CMT Process Improves Mechanical Properties of Al 6061-T6 and SS 304 Lap Joints for Automotive

DOI

10.2991/978-94-6463-252-1_116How to use a DOI?

Keywords

Pulsed Cold Metal Transfer (PCMT); Heat Input (HI); Contact Angle (CA); Heat Affected Zone (HAZ); Fusion Zone (FZ); Intermetallic Compound (IMC); Dissimilar Metal and Welding Travel (WT)

Abstract

Automotive manufacturers are facing greater demands to improve the fuel efficiency and performance of their vehicles while also reducing the overall weight. In order to meet these challenges, manufacturers are turning to alternative materials such as stainless steel and aluminium for their vehicle structures. This research study focused on welding and brazing Al 6061-T6 and SS 304 with different thicknesses and lap joints using the pulse Cold Metal Transfer (PCMT) process. The goal was to evaluate the mechanical properties of the joints, specifically the tensile-shear strength and microhardness, and to characterize the macro and microstructures using Optical microscopy and SEM. The results show that by varied welding parameters and found that the bead width (BW) and contact angle (CA) depend on heat input (HI) and the combination of parameters used. Increasing HI generally led to higher bead width and lower contact angle. Increasing welding travel (WT) and decreasing interval time resulted in higher microhardness values of the heat affected zone (HAZ) and fusion zone (FZ). The microhardness of the HAZ of both materials varied with input parameters, with increasing welding travel and decreasing interval time resulting in higher maximum loads, maximum stresses, and yield stresses. The tensile strength of the joint was influenced by the microstructure and microhardness values of the welded joint, with the highest values obtained in Trial T8. The fusion zones had corrugated and curved shapes and were more prominent at the joints, while the Intermetallic compound (IMC) at the Al 6061-T6 and SS 304 interact were less than 10 microns.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Md Anwar
AU  - R. Rajendra
PY  - 2023
DA  - 2023/11/09
TI  - Pulsed CMT Process Improves Mechanical Properties of Al 6061-T6 and SS 304 Lap Joints for Automotive
BT  - Proceedings of the Second International Conference on Emerging Trends in Engineering (ICETE 2023)
PB  - Atlantis Press
SP  - 1159
EP  - 1171
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-252-1_116
DO  - 10.2991/978-94-6463-252-1_116
ID  - Anwar2023
ER  -