振动条件下硬铝合金TIG焊接的工艺优化

发布时间：2018-04-18 20:07

本文选题：硬铝合金 + 显微组织　；参考：《焊接学报》2017年05期

【摘要】：采用Al-Si系焊丝对Al-Cu-Mg硬铝合金进行半自动TIG焊,焊接过程中施加机械振动.采用正交试验方法对工艺参数进行优化,并对不同工艺参数下硬铝合金的焊接接头进行拉伸性能、硬度、显微组织和物相分析,分析振动参数和焊接参数对焊接接头组织性能的影响规律和作用机理.结果表明,最佳工艺匹配参数为:焊接电流I=110 A、振动幅度D=0.05 mm、振动频率f=50 Hz,此时接头的性能为:抗拉强度R_m=289.68 MPa,断后伸长率A=4.95%,焊缝平均硬度H为108.0 HV;合适参数的振动可以细化焊缝区显微组织、抑制孔状缺陷,并使焊缝显微组织为细小的等轴树枝晶和胞状树枝晶为主,进而提高焊接接头综合力学性能.
[Abstract]:Semi-automatic TIG welding of Al-Cu-Mg hard aluminum alloy was carried out with Al-Si wire. Mechanical vibration was applied during welding.The process parameters were optimized by orthogonal test, and the tensile properties, hardness, microstructure and phase of welded joints of hard aluminum alloy under different process parameters were analyzed.The effects of vibration parameters and welding parameters on the microstructure and properties of welded joints are analyzed.The results show thatThe optimum process matching parameters are as follows: welding current 110A, vibration amplitude D0. 5mm, vibration frequency 50 Hz. The properties of the joint are as follows: tensile strength R_m=289.68 MPA, elongation after break A4. 95, average hardness H of weld seam 108.0 HV.The vibration with appropriate parameters can be refined.Microstructure of weld zone,The pore defects were restrained and the microstructure of the weld was mainly composed of fine equiaxed dendrites and cellular dendrites, thus improving the comprehensive mechanical properties of the welded joints.
【作者单位】：沈阳工业大学材料科学与工程学院;
【基金】：辽宁省科技资助项目(20131079)
【分类号】：TG457.14

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