The Effects of Laser Peening and Shot Peening on Mechanical Properties in Friction Stir Welded 7075-T7351 Aluminum |
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Authors: | Omar Hatamleh |
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Affiliation: | (1) Structures & Dynamics Branch, NASA-Johnson Space Center, Houston, TX 77058, USA |
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Abstract: | Peening techniques like laser peening and shot peening were used to modify the surface of friction stir welded 7075-T7351
Aluminum Alloy specimens. The tensile coupons were machined such as the loading was applied in a direction perpendicular to
the weld direction. The peening effects on the global and local mechanical properties through the different regions of the
weld were characterized and assessed. The surface hardness levels resulting from various peening techniques were also investigated
for both sides of the welds. Shot peening resulted in an increase to surface hardness levels, but no improvement was noticed
on the mechanical properties. In contrast, mechanical properties were improved by laser peening when compared to the unpeened
material. |
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Keywords: | friction stir welding laser peening mechanical properties shot peening |
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