Journal
OPTICS AND LASERS IN ENGINEERING
Volume 47, Issue 11, Pages 1231-1241Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2009.05.010
Keywords
Laser welding; Nd:YAG laser; Ti-6Al-4V; Butt joint; Welding speed
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Annealed Ti-6Al-4V alloy sheets with 1 and 2 mm thickness are welded using a 4 kW Nd:YAG laser system. The effects of welding speed on surface morphology and shape, welding defects, microstructure, hardness and tensile properties are investigated. Weld joints without or with minor cracks, porosity and shape defects were obtained indicating that high-power Nd:YAG laser welding is a suitable method for Ti-6Al-4V alloy. The fusion zone consists mainly of acicular alpha' martensite leading to an increase of approximately 20% in hardness compared with that in the base metal. The heat-affected zone consists of a mixture of alpha' martensite and primary alpha phases. Significant gradients of microstructures and hardness are obtained over the narrow heat-affected zone. The laser welded joints have similar or slightly higher joint strength but there is a significant decrease in ductility. The loss of ductility is related to the presence of micropores and aluminum oxide inclusions. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
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