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Static shear strength and fatigue life of refill friction stir spot welded AA 6061-T6 sheets

Venukumar, S and Yalagi, SG and Muthukumaran, S and Kailas, SV (2014) Static shear strength and fatigue life of refill friction stir spot welded AA 6061-T6 sheets. In: SCIENCE AND TECHNOLOGY OF WELDING AND JOINING, 19 (3). pp. 214-223.

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Official URL: http://dx.doi.org/10.1179/1362171813Y.0000000181

Abstract

This study was aimed at evaluating the static shear strength and fatigue properties of the newly developed refilled friction stir spot welded AA 6061-T6 joints. The keyhole, the process disadvantage of conventional friction stir spot welding, was refilled successfully, using an additional filler plate, with specially designed tools. Two different tool profiles, namely, convex and concave, were used for the refilling process. Sound and defect free joints were obtained by the refilling process. Joints refilled with convex tools showed better static shear strength than those with the concave ones. The variation of microhardness in different regions of the weld was analysed. Fatigue tests were conducted on the lap shear specimens at a stress ratio of R=0.1. The optical micrographs of the welds after fatigue failure in both the conventional and refilled processes were examined to study the fatigue crack propagation and failure modes.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the MANEY PUBLISHING, STE 1C, JOSEPHS WELL, HANOVER WALK, LEEDS LS3 1AB, W YORKS, ENGLAND
Keywords: AA 6061-T6; Refill friction stir spot welding; Static shear strength; Fatigue life
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 25 Jul 2014 10:23
Last Modified: 25 Jul 2014 10:23
URI: http://eprints.iisc.ac.in/id/eprint/49457

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