铝合金活性TIG焊接接头性能研究

针对6061铝合金，采用自行研制的混合活性剂配方，利用正交设计法进行焊接工艺试验，得到一组性能良好的焊接工艺参数。在此焊接工艺条件下，混合活性剂增加熔深效果显著，可一次焊透10 mm的铝板，实现单面焊双面成形。焊后对焊缝的微观组织进行了观察和分析，并通过力学性能试验分析了活性剂对焊缝力学性能的影响。结果表明：与常规TIG焊相比，活性TIG焊的焊缝组织细密，基本不存在气孔、裂纹、夹杂等焊接缺陷；活性TIG焊接接头的拉伸强度和断裂伸长率均可达到与母材相当的水平，焊缝区的硬度明显提高，焊接接头性能良好。

Study of joint properties of aluminum alloy A-TIG welding

A serial of welding procedure tests employing customized mixed flux were applied in the orthogonal ex-perimental design,from which a set of welding parameters was obtained.The mixed flux enlarged the weld-pene-tration tremendously under this condition,and allowed double-side formation with one-side welding on 10mm a-luminum plate.The mechanical properties of the bead,as well as the microstructure in it,were tested to evalu-ate the effect of the flux on mechanical properties of welding beads.Results showed that activating flux TIG weld beads were fine and basically had no welding defect such as gas pore,crack,or slag inclusion.The mechanical performance of the joint was excellent.The weld hardness of the activating flux TIG weld joint was improved and the tensile strength and elongation at break achieved an equivalent level as base metal.