CAJ | 학술논문

通过对主管道取样管焊缝缺陷进行金相检验和断口形貌分析，结合材料性能、焊接工艺及管座加工等因素，对主管道取样管焊缝裂纹缺陷产生的原因进行分析。结果表明，取样管焊趾附近的裂纹为疲劳裂纹，引起疲劳开裂的重要因素是外表面焊趾附近形状突变、机加工沟痕较深，在机加工时经受疲劳载荷。分析结果为防止后续项目发生同类问题提供了理论依据。
통과대주관도취양관한봉결함진행금상검험화단구형모분석，결합재료성능、한접공예급관좌가공등인소，대주관도취양관한봉렬문결함산생적원인진행분석。결과표명，취양관한지부근적렬문위피로렬문，인기피로개렬적중요인소시외표면한지부근형상돌변、궤가공구흔교심，재궤가공시경수피로재하。분석결과위방지후속항목발생동류문제제공료이론의거。
Through metallographic examination and fracture morphology by sampling from the main pipe weld defects,combined with the material properties,welding procedure and sampling tube machining and other factors,an analysis is completed for the causes of the main pipeline sampling tube welding crack. The results show that,the crack of sampling pipe near the weld toe is fatigue crack,the important factor causing the fatigue cracking is near the outer surface of toe shape mutation,machining grooves deeper. Through defect analysis results,a theoretical basis is provided for preventing the follow-up project similar problems.