Effect of welding speed on butt joint quality of Ti-6Al-4V alloy welded using a high-power Nd:YAG laser
Effect of welding speed on butt joint quality of Ti-6Al-4V alloy welded using a high-power Nd:YAG laser
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DOI：
10.1016/j.optlaseng.2009.05.010
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发表时间：
2009-11-01
影响因子：
4.6
通讯作者：
Jahazi, M.
中科院分区：
文献类型：
--
作者：
Cao, X.;Jahazi, M.
用4kW的激光系统焊接了厚度分别为1 mm和2 mm的Ti-6Al-4V合金退火板。研究了焊接速度对表面形貌、焊接缺陷、显微组织、硬度和拉伸性能的影响。焊接接头无或有微小裂纹、气孔和形状缺陷，说明高功率激光焊接是一种适合于Ti-6Al-4V合金的方法。熔合区主要由针状α‘马氏体组成，硬度较母材提高约20%。热影响区由α‘马氏体和初生α相混合而成。在狭窄的热影响区获得了显著的显微组织和硬度梯度。激光焊接接头具有相似或略高的接头强度，但延性显着降低。塑性的丧失与微孔和氧化铝夹杂物的存在有关。皇冠版权所有(C)2009由爱思唯尔有限公司出版。保留所有权利。
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.