通过两种类型的宽板拉伸试验,依照毛截面屈服准则和COD设计曲线方法,研究和评定了埋藏裂纹对结构强度的影响,得出毛截面屈服准则是较为合理的缺陷验收准则的结论。同时指出,埋藏裂纹首先是沿厚度方向扩展的,变为贯穿裂纹后才开始向宽度韧带方向扩展。对于埋藏裂纹来说,在评定焊接构件强度中,深度是比长度更为重要的参数。 Through two types of wide-plate tensile test, according to gross section yield criterion and COD design curve method, the influence of burial crack on structural strength was studied and evaluated. It was concluded that hair section yield criterion was more reasonable defect acceptance criteria. At the same time, it is pointed out that the burial cracks firstly expand along the thickness, and then penetrate into the crack and begin to expand toward the width ligament. For burial cracks, depth is a more important parameter than length in assessing the strength of welded components.