A stress analysis is described for a nuclear steam generator tubesheet with a thin, or irregular ligament, associated with a mis-drilled hole using the rules of ASME （American Society of Mechanical Engineers） B ＆ P...A stress analysis is described for a nuclear steam generator tubesheet with a thin, or irregular ligament, associated with a mis-drilled hole using the rules of ASME （American Society of Mechanical Engineers） B ＆ PV Section Ⅲ and non-mandatory Appendix A, Article A-8000 for stresses in perforated flat plates. The analysis demonstrates the proper application of the NB-3200 rules for this special application, with discussion of the differences between an actual tube hole deviation and what is assumed in ASME Appendix A. This is a companion paper to ＂Technical Justification Supporting Operation with a Tube Installed in a Mis-Drilled Hole of a Steam Generator Tubesheet＂.展开更多
针对双钨极单热丝自动TIG工艺原理和技术优越性进行探索,采用双钨极单热丝自动TIG工艺在SA-508 Grade 3 Class 1锻件管板上进行镍基合金堆焊,并对堆焊层的各项性能进行试验研究,验证该方法在管板堆焊技术中应用的可行性。通过对焊接工...针对双钨极单热丝自动TIG工艺原理和技术优越性进行探索,采用双钨极单热丝自动TIG工艺在SA-508 Grade 3 Class 1锻件管板上进行镍基合金堆焊,并对堆焊层的各项性能进行试验研究,验证该方法在管板堆焊技术中应用的可行性。通过对焊接工艺参数的优化,该工艺方法在核电产品及管壳式换热器类设备制造中进行推广应用,熔敷效率可达到2.5~6 kg/h,工艺熔敷效率约为普通单热丝自动TIG的3倍,可在有效保证核电产品管板镍基堆焊层质量的前提下,缩短核电产品的制造周期。展开更多
文摘A stress analysis is described for a nuclear steam generator tubesheet with a thin, or irregular ligament, associated with a mis-drilled hole using the rules of ASME （American Society of Mechanical Engineers） B ＆ PV Section Ⅲ and non-mandatory Appendix A, Article A-8000 for stresses in perforated flat plates. The analysis demonstrates the proper application of the NB-3200 rules for this special application, with discussion of the differences between an actual tube hole deviation and what is assumed in ASME Appendix A. This is a companion paper to ＂Technical Justification Supporting Operation with a Tube Installed in a Mis-Drilled Hole of a Steam Generator Tubesheet＂.
