针对木桨蒸球的料孔圈上含有未焊透缺陷的情况，设计模拟疲劳试验．通过对模拟４种状况的试样所测得的数据，对蒸球使用寿命进行了定量分析．测试结果表明：在标定内压下工作，焊缝缺陷对蒸球使用寿命的影响较小，而在经常性的超荷下运行会使该结构的使用寿命显著减少 Aiming at the problem that the hole circle of the wooden paddle steamed ball contains the impermeable defects, the simulated fatigue test is designed. By analyzing the data measured in four kinds of samples, the service life of steamed balls was quantitatively analyzed. The test results show that the weld bead defect has little effect on the service life of the steam bulb when it works under the calibrated internal pressure, and the service life of the structure is significantly reduced when operated under the regular over-load