基于SWRXD的5083/6082异种铝合金搅拌摩擦焊接头的残余应力分布规律

以5083铝与6082铝为研究对象，利用搅拌摩擦焊（friction stir welding，FSW）制备了异种材料对接接头.利用短波长X射线衍射（short-wavelength X-ray diffraction，SWRXD）技术，以{311}与{111}为衍射晶面，基于极图最外圈织构参量确定了残余应力测试方向，采用d₀法研究了FSW焊件中心层的残余应力.结果表明，{111}和{311}晶面测试的纵向残余应力分布趋势相近，焊核区为拉应力并出现两个应力峰值；{111}晶面的测试结果更为离散，应力的峰值向前进侧偏移；采用{111}晶面测试的横向的残余应力分布趋势与{311}晶面测试的结果偏差较大.

Residual stress in friction stir welded joint of dissimilar Al alloys between 5083 and 6082 with SWRXD technology

Dissimilar Al alloys of 5083 and 6082 Al alloys were welded by friction stir welding (FSW) with butt joint. With short-wavelength X-Ray diffractometer (SWXRD), measuring directions of residual stress for {311} and {111} crystal planes were respectively determined by analyzing the outmost circle data of pole figures. Then, welding residual stress of center layer in FSW plate was investigated by d₀ method. The results show that the longitudinal stress distribution on {311} crystal plane is similar to that on {111} crystal plane, while the two peak values of tensile stress appear in weld zone. Compared with {311} crystal plane, the measuring data on {111} crystal plane are more scattered. There is a relatively large difference of transverse residual stress between {111} and {311} crystal planes.