The Study of Residual Stress in Welded Specimens of Aluminium Alloy by Using Acoustic Emission Method
Welding is one of the most significant causes of residual stresses and typically produces large tensile stresses whose maximum value can be approximately equal to the yield strength of the materials being joined. These large tensile stresses are often responsible for premature component failure. Metallurgical welding joints are extensively used in the fabrication industry, including ships, offshore structures, steel bridge, and pressure vessels. In this study, residual stresses in welded specimens of AL–6061 were evaluated by using ACOUSTIC EMISSION method which is one of the nondestructive tests. In this work, AE signals formed during the tensile test of welded specimens were investigated. The results show that AE signals in specimens which have large amount of residual stress were detected in less load.
Z. Saeidi Nia et al., "The Study of Residual Stress in Welded Specimens of Aluminium Alloy by Using Acoustic Emission Method", Applied Mechanics and Materials, Vols. 110-116, pp. 3617-3623, 2012