Title: Surface hardness changes in laser peened Friction Stir Welded 2195 and 7075 Aluminum Alloys

Authors: Omar Hatamleh

Addresses: Structures Branch, NASA – Johnson Space Center, Houston, TX 77058, USA

Abstract: The effects of peening techniques like laser and shot peening on hardness were investigated for friction stir welded 2195 and 7075 Aluminum Alloys (AA). The surface hardness variations from various peening techniques were investigated for both sides of the welds. The laser peening intensity used in this investigation resulted in hardness level 28% higher in the weld nugget region. The hardness levels due to laser peening increased proportionally with the number of peening layers in the 2195 aluminum alloy. In contrast, 7075 aluminum alloy exhibited little difference in hardness as the number of peening layers increased.

Keywords: friction stir welding; FSW; laser peening; shot peening; microhardness; surface hardness; aluminium alloys.

DOI: 10.1504/IJSURFSE.2008.018965

International Journal of Surface Science and Engineering, 2008 Vol.2 No.1/2, pp.14 - 28

Published online: 26 Jun 2008 *

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