摘要
常压不锈钢储罐接管区域因结构突变、焊接应力及腐蚀,易发生应力腐蚀开裂和点蚀,传统检测方法检出率不足30%。红外热波检测(IRT)通过主动热激励诱发温度场变化,利用红外热像仪捕捉热扩散异常,具有非接触、全场扫描优势,对长度≥0.1mm裂纹与长度≥2mm点蚀敏感,单接管检测≤20分钟。针对难点,采用环形热源布局和相位锁定技术提升信噪比超15dB。实际应用表明,经预处理和标定,IRT能快速识别缺陷,对长度≤5mm缺陷灵敏度优于传统方法,但深层缺陷(长度>8mm)检出率低,定量化受材料与环境因素影响,未来需优化以拓展深度适用性。
Atmospheric stainless steel tank nozzle zones are prone to stress corrosion cracking and pitting corrosion due to structural discontinuities,welding residual stresses,and media corrosion.Conventional inspection methods exhibit detection rates below 30%.Infrared Thermal Wave Testing(IRT)utilizes active thermal excitation to induce temperature field variations,capturing thermal diffusion anomalies via infrared cameras.This approach offers non-contact,full-field scanning advantages,demonstrating sensitivity to defects including≥0.1mm cracks and≥2mm pitting corrosion,with single nozzle inspection completed within≤20 minutes.To address key challenges,multi-source annular heating configurations combined with phase-locked signal processing enhance the signal-to-noise ratio by over 15dB.Case studies demonstrate that with proper pre-processing and calibration,IRT enables rapid defect identification,outperforming traditional methods for defects≤5mm.However,detection capability decreases for deeper flaws(>8mm),and quantitative analysis is influenced by material properties and environmental factors.Future optimization is required to extend applicability to full-depth inspection.
作者
孙卫
龚浩
朱同同
Sun Wei;Gong Hao;Zhu Tongtong(Special Equipment Safety Supervision Inspection of Jiangsu Province,Nanjing 210003)
出处
《中国化工装备》
2026年第1期58-62,共5页
China Chemical Industry Equipment
关键词
不锈钢储罐
焊接
红外热波
接管
stainless steel tanks
welding
infrared thermal wave
nozzles
