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以可靠性理论为基础 ,制定了电站锅炉蛇形管焊接接头的加速寿命试验规范。通过对大量新制的 15CrMo摩擦焊接头的高温内压爆破持久试验 ,证明了试验规范的正确性和各组合应力水平的失效机理的一致性。在此规范的基础上 ,对已运行过132kh的 12Cr1MoV摩擦焊接头 ,建立了带有可靠度指标的残余寿命数学模型 ,计算结果表明摩擦焊接头 ,在设计寿命期内是完全可靠的 ,摩擦焊这种焊接工艺的质量是稳定可靠的。文中提出的试验方法和数学模型对高温承压部件的残余寿命的预测和确定那些超期服役管道或接头的更换时间方面具有实际意义
Based on the reliability theory, the accelerated life test specification for the welded joints of the serpentine pipe of the boiler in a power station is formulated. Through the long-term high-temperature internal pressure blasting tests on a large number of newly-made 15CrMo friction welded joints, the correctness of the test specifications and the consistency of the failure mechanisms of the stress levels at each combination were proved. Based on this criterion, a mathematical model of residual life with reliability index of 12Cr1MoV friction welding head which has been running for 132kh is established. The calculation results show that the friction welding joint is completely reliable during the design life, and the friction welding The quality of this welding process is stable and reliable. The test methods and mathematical models presented in this paper have practical implications for the prediction of the residual life of high-temperature pressure-bearing components and for the determination of the replacement time of out-of-service pipes or fittings