Acoustic emission and infrared thermography detection of Q245R steel welding specimens
LIU Yaping¹, DU Yonggang², ZHANG Ruipeng³, ZHAO Wei¹, ZHAO Kun³, ZHOU Wei²
1. Baoding Branch of Hebei Special Equipment Supervision and Inspection Institute, Baoding 071002, China;
2. Hebei University, Baoding 071002, China;
3. China Construction Installation Engineering Co., Ltd., Nanjing 210000, China
Abstract: Weld pass inspection is an important step in the safety inspection of refrigerating pressure vessel. In order to study the effect of welding on the damage evolution of Q245R steel for refrigeration pressure vessels, acoustic emission (AE) and infrared thermal imaging (IRT) complementary monitoring techniques were used to detect the dynamic damage and temperature field of complete and welded Q245R steel specimens under tensile load. The characteristic waveform of AE signal is analyzed by using fast Fourier transform and wavelet transform. The results show that AE signals with amplitude over 80 dB and ringing count over 500 are generated in the damage evolution of welded specimens, and a large number of AE signals are generated in the yield and necking stages. The AE waveform amplitude and maximum wave coefficient are higher than those of intact specimens, but the cumulative AE impact number is far less than that of intact specimens. In terms of temperature field variation, the welding specimens can end the cooling of elastic stage earlier, and continue to rise in the neck shrinking stage. IRT can help improve the accuracy of AE detection results, and the research results can provide a reference for the safety detection of refrigeration pressure vessels.
Keywords: Q245R steel;welding;acoustic emission;infrared thermography technology
2023, 49(9):174-180  收稿日期: 2021-12-14;收到修改稿日期: 2022-02-06
基金项目: 河北省市场监督管理局重点项目（2019ZC08）
作者简介: 刘亚萍（1987-），女，河北张家口市人，高级工程师，硕士，主要从事压力容器声发射检测研究
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