摘要
研制开发了铝/钢特种钎剂,利用研制开发的铝/钢特种钎剂成功地实现了5A02铝合金板与普通Q235冷轧钢板的大光斑Nd∶YAG激光—脉冲MIG复合热源熔—钎连接,并对焊缝的成形、接头的性能及成分、钎剂中各成分的作用进行了分析。结果表明,涂有KAlF4+Sn+Zn配方钎剂的Q235试板得到的焊缝成形美观,并且焊接过程稳定;拉伸试验中试样的破坏位置发生在铝母材的焊接热影响区,铝母材热影响区略有软化,接头抗拉强度可达167.3 MPa,约为5A02铝合金母材抗拉强度的83.6%,与5A02铝合金熔化焊接头的强度相当,接头的断裂方式为混合断裂;剪切试验中接头的最高抗剪强度可达106.3 MPa。扫描电镜分析表明,在接头钎焊连接界面处生成了一层厚度约为3.27μm的金属间化合物层;能谱测试结果表明,Al,Fe原子在钎焊界面处扩散较为充分。
A special type brazing flux was successfully developed.Using this special type brazing flux,5A02 aluminium sheet could be joined to Q235 steel sheet by large spot Nd∶YAG laser-pulsed MIG hybrid welding.Weld appearance and mechanical properties and component of the joints as well as the function of each composition of the brazing flux were analyzed.The results indicated that a good fusion-brazing weld could be obtained by using KAlF4+Sn+Zn brazing flux on the Q235 steel sheet,and the process was stable.The t...
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第6期21-24,28+114,共6页
Transactions of The China Welding Institution
基金
国家"十一五"科技支撑计划项目(2006BAF04B10)
