论文部分内容阅读
在铝合金与钢之间添加Ag中间层后进行电子束焊接实验。其他参数固定的情况下,对电子束作用位置不同时的焊缝成形、接头组织和力学性能进行分析。结果表明:随着电子束斑点从银-钢对接面向银侧偏移距离的增大,焊缝成形明显得到改善,接头中的气孔缺陷消失。在银-铝对接面形成由Ag2Al和Al共晶组成的过渡层,过渡层随着偏束距离的增大而变窄且不连续。当偏束距离过大时,在银-钢界面上形成FeAl和FeAl3两种化合物层。当电子束最佳偏束距离为0.2mm时,接头强度最高达193MPa,为铝母材的88.9%,此时断裂发生在银-钢界面上。
Electron beam welding experiment was carried out after adding Ag intermediate layer between aluminum alloy and steel. In the case of other fixed parameters, the welding seam shape, joint structure and mechanical properties are analyzed when the position of electron beam is different. The results show that with the increase of the offset distance of the electron beam spot from the silver-steel butt joint to the silver side, the weld seam formation is obviously improved and the porosity defects in the joint disappear. A transition layer consisting of Ag2Al and Al eutectic is formed on the silver-aluminum butt joints, and the transition layer becomes narrower and discontinuous with the increase of the deflection distance. When the deflection distance is too large, two layers of compound FeAl and FeAl3 are formed on the silver-steel interface. When the optimal electron beam beam bias distance of 0.2mm, the joint strength of up to 193MPa, 88.9% for the aluminum base metal, then the fracture occurred in the silver - steel interface.