To investigate how the fabrication and repair of socket welded joints could be used to enhance fatigue resistance under vibration condition, experimental test data of installation conditions that potentially influence fatigue strength were analyzed with the S–N curve. It was found that the decreasing fatigue strength of stainless steel socket welded joints was attributed to the effect of high heat input of welding process. The effect of welding method, slip-on gap and radial-gap conditions on fatigue strength was insignificant. The test data of repair technique application, 2 × 1 leg length and of socket weld overlay, clearly showed higher fatigue strength but there was a limitation for higher stress region because of the weld toe crack.

为了研究承插焊接头的制造和修复如何提高振动条件下的疲劳强度，使用 S-N 曲线分析了可能影响疲劳强度的安装条件的实验测试数据。研究发现，不锈钢承插焊接头疲劳强度下降的原因是焊接过程中高热输入的影响。焊接方法、滑动间隙和径向间隙条件对疲劳强度的影响不显着。修复技术应用、2 × 1 腿长和承插焊堆焊的测试数据清楚地显示出较高的疲劳强度，但由于焊趾裂纹，对较高应力区域存在限制。