Submergence and buoyancy may cause fatigue damage to cone-cylinder pressure structures (CCPSs). High-strength steel structures are prone to generating larger welding residual stress, which affects their fatigue strength and safety assessment. Therefore, it is necessary to investigate the effects of residual stress and its release on the fatigue strength of typical CCPS welded joints. In this study, typical CCPS welded joints were taken as the research object. First, the welding residual stress was investigated via non-destructive testing and numerical simulations. Then, a tensile test device was designed to investigate the release of welding residual stress and numerical simulations were carried out. The numerically obtained residual stresses coincide with those obtained by the tensile test. On this basis, the effects of residual stress on the fatigue life of typical CCPS welded joints was investigated with the tensile device and fatigue testing machine. The results show that the residual stress near the welding seam would be greatly released under an external load. The fatigue life of the structures is clearly decreased considering the welding residual stress. Therefore, it is determined that welding residual stress plays an important role in the analysis of the fatigue life of typical ship welded joints.

浸入水中和浮力可能会导致圆锥形圆柱体压力结构（CCPS）的疲劳损坏。高强度钢结构易于产生较大的焊接残余应力，从而影响其疲劳强度和安全性评估。因此，有必要研究残余应力及其释放对典型CCPS焊接接头疲劳强度的影响。本研究以典型的CCPS焊接接头为研究对象。首先，通过无损检测和数值模拟研究了焊接残余应力。然后，设计了一种拉伸试验装置来研究焊接残余应力的释放，并进行了数值模拟。在数值上获得的残余应力与通过拉伸试验获得的残余应力一致。以这个为基础，利用拉伸装置和疲劳试验机研究了残余应力对典型CCPS焊接接头疲劳寿命的影响。结果表明，在外部载荷作用下，焊缝附近的残余应力会大大释放。考虑到焊接残余应力，结构的疲劳寿命明显缩短。因此，可以确定，焊接残余应力在典型船用焊接接头的疲劳寿命分析中起着重要作用。