焊管2024，Vol.47Issue(7)：32-38,7.DOI:10.19291/j.cnki.1001-3938.2024.07.005
Mg元素和表层晶粒对3A21铝合金CAB焊接性能的影响
Effect of Mg and Surface Grain on CAB Weldability of 3A21 Aluminum Alloy
朱单单 1杨炳元 1刘享新1
作者信息
- 1. 贵州永红换热冷却技术有限公司,贵州 黔南州 550600
- 折叠
摘要
Abstract
In order to study the effects of Mg content and surface grains on the controlled atmosphere brazing(CAB)weldability of 3A21 aluminum alloy,CAB welding process containing fluoride flux was used to braze aluminum alloy with different Mg content and grain distribution,and the microstructure and mechanical properties of 3A21 aluminum alloy brazed weld were analyzed by airtight test bench,blasting test bench,metallographic microscope and field emission scanning electron microscope(SEM).The results show that Mg elements form high melting point compounds with F elements in the flux during CAB welding,consume the active components of the flux and form slag inclusion defects.The grain layer of grade 1 grain size uniformly distributed on the surface of the part is stable in the process of brazing and can promote the formation of the good brazed weld.When Mg content is less than 0.015%and there are uniformly distributed circular grains on the surface,3A21 aluminum alloy has good CAB weldability with fluoride flux.关键词
3A21铝合金/CAB焊接/钎焊缝/Mg含量/晶粒尺寸Key words
3A21 aluminum alloy/CAB welding/brazed weld/Mg content/grain size分类
矿业与冶金引用本文复制引用
朱单单,杨炳元,刘享新..Mg元素和表层晶粒对3A21铝合金CAB焊接性能的影响[J].焊管,2024,47(7):32-38,7.
