期刊
MATERIALS & DESIGN
卷 77, 期 -, 页码 50-58出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.03.064
关键词
AA7075; Laser beam; Porosity; HAZ liquation cracking; Keyhole; Microstructure
The weldability of AA7075-T651 during keyhole laser and laser-arc hybrid welding was studied using microstructural and X-ray radiography techniques. The results showed that the application of cold wire laser welding reduced macroporosity, while the problem of heat-affected zone (HAZ) cracking was appreciably minimized by modifying the amount of heat in the HAZ. It was also found that the welding condition that minimized macroporosity was found unfavorable for resistance to HAZ cracking and vice versa. A compromise between these competing weld discontinuities was realized by a combination of localized modification of the strength of the HAZ and the application of cold wire laser welding. Also, differences were observed in the extent of porosity for Ar-shielded and He-shielded laser welds, where Ar shielding appeared to be more effective in minimizing porosity. In addition, the ability of AA7075-T651 to recover mechanical strength by post-weld natural aging will be useful when post-weld heat treatment is not practicable. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据