采用盲孔法测量了电子束预热与焊接复合加工300M超高强度钢板的残余应力分布。结果表明,垂直于焊缝方向的纵向残余应力以拉应力为主,横向残余应力以压应力为主,焊缝中心的最大纵向和横向残余应力分别为34.3和9.2 MPa;最大残余拉应力峰值出现在母材区,其应力值约为208.3 MPa,远低于母材屈服强度。沿焊接方向残余应力变化不大,可近似认为其分布基本稳定。 The residual stress distribution of 300M ultra-high strength steel sheet pre-heated by electron beam and the welding process was measured by blind hole method. The results show that the longitudinal residual stress perpendicular to the direction of the weld is mainly tensile stress and the transverse residual stress is dominated by compressive stress. The maximum longitudinal and transverse residual stresses in the weld center are 34.3 and 9.2 MPa, respectively. The peak of maximum residual tensile stress In the base metal zone, the stress value is about 208.3 MPa, much lower than the yield strength of the base metal. Residual stress along the welding direction changes little, it can be assumed that the distribution of the basic stability.