Ultrasonic Infrared Thermography Detection of Austenitic Stainless Steel Welds Cracks
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摘要: 基于ANSYS有限元软件模拟了焊缝裂纹在超声激励作用下的升温现象，定性分析了超声激励幅值、频率、方向和焊缝余高4个参数对裂纹升温的影响。此外，通过对比有限元模拟下的超声红外热像法的检测结果与渗透检测结果，验证了超声红外检测焊缝裂纹的可行性，并通过试验验证了有限元分析的准确性。研究表明，超声红外热像法在奥氏体不锈钢焊缝裂纹无损检测方面具有潜在的应用价值。Abstract: Based on the ANSYS finite element analysis software, the heating phenomenon of weld cracks under ultrasonic excitation was simulated. The effects of ultrasonic excitation amplitude, frequency, direction and weld height on the crack temperature rise are analyzed qualitatively. In addition, the feasibility of ultrasonic infrared detection of weld cracks is verified by comparing the results of ultrasonic infrared thermal imaging and penetration detection, and the accuracy of finite element analysis is verified by experiments. This study shows that ultrasonic infrared thermal imaging has potential application value in non-destructive testing of austenitic stainless steel weld cracks.
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