Microstructure and mechanical properties of AA7075(T6) hybrid laser/GMA welds

The weldability of AA7075 using a hybrid laser/gas metal arc (GMA) welding process was examined. After welding process optimisation, the influence of filler wire composition, natural ageing, artificial ageing and a short duration solution heat treatment was investigated to enhance weld microstructur...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-06, Vol.459 (1), p.94-100
Main Authors: Hu, B., Richardson, I.M.
Format: Article
Language:English
Subjects:
AA7075
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Hybrid laser/GMA
Joining, thermal cutting: metallurgical aspects
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical property
Metals. Metallurgy
Microstructure
Solution heat treatment
Welding
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Summary:The weldability of AA7075 using a hybrid laser/gas metal arc (GMA) welding process was examined. After welding process optimisation, the influence of filler wire composition, natural ageing, artificial ageing and a short duration solution heat treatment was investigated to enhance weld microstructural and mechanical properties. Results show that after a short solution heat treatment, a large fraction of the dendrite boundaries in the weld fusion zone dissolved in the primary phase. Tensile tests and micro-hardness tests show that the weld has a comparable strength to the T6 base alloy when welding with an AA2319 consumable. Fracture surfaces observed under a scanning electron microscope indicate a large number of fine ductile type voids and larger sized dimples. The improved ductility of the weld together with the strength comparable to the base alloy make the weld more formable than none solution heat-treated welds.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.12.094