Process Window for Friction Stir Lap Welding of Aluminum Alloy 6061

Simon Larose; Maxime Guérin; Priti Wanjara

doi:10.4028/www.scientific.net/MSF.783-786.2839

Paper Titles

A Study on the Effect of the Interpass Temperatures in Properties and Microstructures of the Alloy 625 Dissimilar Fusion Zone
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Evaluation of the Corrosion Resistant Weld Cladding Deposited by the TIG Cold Wire Feed Process
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Plasma Diagnostics of Arc during MIG Welding of Aluminum
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Hybrid Laser-Arc Welding of AA6061-T6 Butt Joints
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Process Window for Friction Stir Lap Welding of Aluminum Alloy 6061
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Optimisation of Diffusion Bonding Parameters of Ti Alloys through the Structure and Surface Conditions
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Hardness Prediction for Temper Bead Welding of Non-Consistent Layer Technique
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Thermal Recovery of Plastic Deformation in Dissimilar Metal Weld
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Surface Property Enhancement of UNS N07718 and G41400 by Ultrasonic Impact Treatment
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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Process Window for Friction Stir Lap Welding of...

Process Window for Friction Stir Lap Welding of Aluminum Alloy 6061

Abstract:

Precipitation-hardenable 6xxx series aluminum alloys are incorporated in many structural components with due consideration of their good combination of properties including a relatively high strength, outstanding extrudability and excellent corrosion resistance. Accordingly, AA6061 has been identified as a very good candidate material for structural lightweighting of transportation vehicles. However, the weldability of aluminum alloy (AA) 6061 by means of conventional technologies such as GMAW and GTAW methods is limited by sensitivity to solidification cracking. In this respect, friction stir welding (FSW) presents a tremendous potential for assembly of aluminum structures for the transportation industry due to the low heat involved that can mitigate crack formation and, thus, translate into improved mechanical performance of the assembly. In this work, FSW of 3.18 mm thick AA6061-T6 sheets in the lap joint configuration was investigated. This configuration is considered to be more challenging for assembly by FSW than the butt joint type due to the orientation of the interface with respect to the welding tools and the necessity to break the oxide layer on two aluminium alloy planar surfaces. Weld trials were performed to examine the influence of the FSW tool geometry and process parameters on the welding defects, microstructure, hardness and bend performance. Unacceptable material expulsion and/or significant thinning in one of the two overlapped sheets were produced under most conditions. A set of FSW tool geometries leading to a viable process operational window under which the risk of defects could be mitigated and/or eliminated was identified in this study.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

2839-2844

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.2839

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Online since:

May 2014

Authors:

Simon Larose*, Maxime Guérin, Priti Wanjara

Keywords:

AA6061-T6, Aluminium Alloy, Friction Stir Welding (FSW), Lap Welding, Process Window

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* - Corresponding Author

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