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奥氏体不锈钢应变强化技术是通过产生一定的塑性形变来提高材料的屈服强度从而达到节省材料的目的。为了保证安全,必须对焊接工艺试板预拉伸后再进行焊缝力学性能测试,试板中的焊接残余应力会对后续取样以及测试结果产生影响,因此受到关注。本文通过有限元数值模拟结合试验数据,得到焊接试板内的温度及残余应力分布,并模拟了预拉伸对焊接残余应力分布的影响,认为垂直焊缝方向的拉伸,可以有效释放焊接过程中产生的残余应力,并弱化了残余应力分布的不均匀性。
Austenitic stainless steel strain hardening technology is to produce a certain degree of plastic deformation to improve the yield strength of the material so as to achieve the purpose of saving materials. In order to ensure the safety, the weld mechanics performance test must be carried out after the pre-tension welding test plate is pre-stretched. The welding residual stress in the test plate will affect the subsequent sampling and test results, and therefore, attention has been paid to it. In this paper, the temperature and residual stress distribution in the welding test plate are obtained by the combination of the finite element numerical simulation and the experimental data, and the influence of pre-stretching on the residual stress distribution is simulated. It is considered that the vertical direction of the welding seam can effectively release the welding process In the residual stress generated, and weakened the residual stress distribution of non-uniformity.