对三种不同制造工艺下的对焊接头进行了静力、疲劳试验，对各种焊接缺陷的影响作了综合评价，统计了三种接头的疲劳起裂位置，给出了它们的Ｓ一Ｎ曲线。 The static and fatigue tests of the butt welded joints under three different manufacturing processes were carried out, and the effects of various welding defects were comprehensively evaluated. The fatigue crack initiation locations of the three joints were calculated and their S-N curve.