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2195-F态铝锂合金TIG焊和FSW焊后残余应力分析

Residual stress analysis of 2195-F state aluminum lithium alloy after TIG welding and FSW

  • 摘要: 采用盲孔法和压痕法,分别对2195-F态铝锂合金手工TIG焊和FSW焊后残余应力进行测量. 结果表明,盲孔法的测量值普遍高于压痕法. 两种焊接方法,近焊缝区的纵向应力均高于横向应力;横向应力整体表现为压应力或小于50 MPa的拉应力;纵向应力在热影响区附近表现为大于焊缝的拉应力. 焊缝区附近,手工TIG焊纵向残余应力大于FSW,且纵向残余应力表现为较大的拉应力,最大值接近于接头的屈服强度;焊缝区外,手工TIG焊和FSW残余应力值相差不大,其横向残余应力基本表现为很小的拉应力或者压应力.

     

    Abstract: The blind hole and indentation method were employed to measure the residual stress of 2195-F aluminum lithium alloy on TIG and FSW welding, respectively, respectively. The results indicate that the measured values of blind hole method was little higher than that of the indentation method. In two welding methods, the longitudinal stress near weld zone is always higher than the transverse stress. The whole transverse stress is compressive stress or tensile stress less than 50 MPa; and the longitudinal stress near heat affected zone is bigger than tensile stress in weld. Near weld zone, the longitudinal residual stress of TIG welding is higher than that of FSW, and the longitudinal residual stress is tensile stress. There is little difference between manual TIG welding and FSW residual stress outside the weld, and transverse residual stress is small tensile or compressive stress.

     

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