Friction Stir Spot Welding of Aa6016 Aluminum Alloy


Friction stir spot welds of 1 mm thick 6016-T4 aluminum alloy sheets were made using conventional pin (CP) tool and off-center feature (OC) tool. Different tool rotation speeds were employed for maximizing the bonded region: 1500 rpm for CP tool and 2500 rpm for OC tool. Effects of penetration depth and plunge speed on cross-tension separation load were investigated and a maximum separation load of about 1.8 kN was obtained. Results indicated that the cross-tension separation load did not change after thermal processing i.e. paint-bake cycle for both tools. It appears that overageing in the nugget region after welding leads to the lack of thermal treatment response. Two separation modes were observed: shear separation and pull-out under cross-tension loading condition. Based on the experimental observation of separation path, load-displacement curve, and microhardness profile, the effect of paint-bake cycle on cross-tension strength and the separation mechanisms are discussed.


Materials Science and Engineering

Keywords and Phrases

Aa6016; Cross-Tension Tests; Friction Stir Spot Welding; Separation Modes

Document Type

Article - Conference proceedings

Document Version


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© 2009 The Minerals, Metals & Materials Society (TMS), All rights reserved.

Publication Date

01 Feb 2009

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