摘要
我国气候环境多样,高速列车无论是在生产过程还是在运行过程中均要经受复杂气候的考验,因此,研究不同环境下铝合金焊接接头的力学性能有着重要的意义。采用单脉冲MIG焊,在环境焊接实验室内(焊接环境为10℃、70%湿度)对不同成分的高强度铝合金材料A5083(#1、#2、#3、#4)进行焊接。之后分别对四组材料的母材和焊缝进行硬度、拉伸等性能测试。结果表明,铝合金的硬度随着Fe和Si含量的增多而升高,#3最大为125 HV。合金元素Mg、Zn、Mn、Cr、Ti则能够提高铝合金抗拉强度。#3最大为302.35 MPa。由于焊接实验在10℃、70%湿度条件下进行,故焊接接头气孔含量比常规焊接条件下焊接接头气孔含量多。气孔的存在对材料的各种力学性能都产生了一定的影响。
The high speed trains have to overcome the diversity environment when it is under fabrication or serving,so it is very important to investigate the mechanical properties.The different types A5083aluminum alloys(named as#1、#2、#3、#4)welded joints were fabricated with single pulse MIG welding technology under10℃and70%humidity.Then the microhardness and tensile strength were tested.The results showed that the#3sample had the maximum microhardness with the value of125HV and with the higher the contents of Fe and Si elements.The alloy element Mg、Zn、Mn、Cr、Ti will improve the tensile properties and the#3sample hadthe maximum value of302.35MPa.Because the welding humidity is70%,so the porosity content is much higher than the original welded environment and which had bad effect on the mechanical properties.
作者
刘敬堂
LIU Jingtang(Bombardier Sifang (Qingdao) Transportation Ltd., Qingdao 266111, China)
出处
《机械》
2017年第11期60-62,68,共4页
Machinery
关键词
焊接接头
环境湿度
显微组织
铝合金
气孔含量
welded joints
humidity
mocrostructure
Aluminum alloys
porosity content
