Effect of post-weld heat treatment on microstructure and mechanical properties of friction stir welded SSM7075 aluminium alloy

Muangjunburee Prapas; Naktewan Jennarong; Prachasaree Woraphot

doi:10.1007/s11595-017-1763-y

Journal of Wuhan University of Technology Materials Science Edition ›› 2017, Vol. 32 ›› Issue (6) : 1420 -1425. DOI: 10.1007/s11595-017-1763-y

Metallic Materials

Effect of post-weld heat treatment on microstructure and mechanical properties of friction stir welded SSM7075 aluminium alloy

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Abstract

7XXX series aluminium alloys generally present low weldability by fusion welding methods because of the sensitivity to weld solidification cracking, vaporization of strengthening alloys and other defects in the fusion zone. Friction stir welding (FSW) can be deployed successfully with aluminium alloys. We presented the effect of post-weld heat treatment (PWHT) on the microstructure and mechanical properties of SSM7075 joints. Semi solid plates were butt-welded by FSW at a rotation speed of 1110 r/min, welding speeds of 70 and 110 mm/min. Solution treatment, artificial aging, and T6 (solution treatment and artificial aging combined) were applied to the welded joints, each with three samples. It was found that the T6 joints at the speed of 70 mm/min yielded the highest tensile strength of 459.23 MPa. This condition best enhanced the mechanical properties of FSW SSM7075 aluminium alloy joints.

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friction stir welding (FSW) / SSM7075 aluminium alloy / post-weld heat treatment (PWHT)

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Muangjunburee Prapas, Naktewan Jennarong, Prachasaree Woraphot. Effect of post-weld heat treatment on microstructure and mechanical properties of friction stir welded SSM7075 aluminium alloy. Journal of Wuhan University of Technology Materials Science Edition, 2017, 32(6): 1420-1425 DOI:10.1007/s11595-017-1763-y

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