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The research aims to evaluate the effects of welding methods, aging, and stress ratios on the fatigue behavior of AA 6061‐T651 aluminum alloy joints.

Effect of Welding, Aging, and Stress Ratio on Fatigue of GMAW and FSW AA 6061‐T651 Joints

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The research aims to evaluate the effects of welding methods, aging, and stress ratios on the fatigue behavior of AA 6061‐T651 aluminum alloy joints.
Conducted fatigue tests on AA 6061‐T651 joints using GMAW and FSW welding methods.
Performed postweld aging at 200°C for 8 hours to observe changes in fatigue behavior.
Analyzed microstructures using optical microscopy, orientation imaging microscopy, and transmission electron microscopy.
Examined fracture surfaces to understand crack initiation and propagation.
PWA–FSW joints demonstrated the highest fatigue strength, approximately 90 MPa at R = 0.1.
Fatigue strength of PWA–FSW joints improved by nearly 30% over untreated FSW joints and 40%–45% over GMAW joints.
Increasing the stress ratio negatively impacted fatigue life due to reduced crack-closure effects.
Microstructural analysis revealed finer grains and stable precipitate distributions in PWA–FSW joints.

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Investigates fatigue behavior in AA 6061 joints, highlighting the impact of welding techniques and aging.

Srivastava et al. (2026) studied this question.

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