不除漆状态下的动车组空心车轴涡流检测

Eddy current inspection of EMU hollow axles without coating removal

动车组空心车轴外表面横向疲劳裂纹是典型的危害型缺陷,若未及时发现,可能引发断轴事故。提出了一种阵列涡流无损检测方法,其能在有300μm厚漆层覆盖的情况下有效检出0.3 mm深人工裂纹,检测能力优于既有超声检测的1 mm深刻槽当量。该方法可融入既有动车组车轴无损检测流程,也可用于轴身等部位超声检测疑似缺陷的复核,具有较强的实用价值。

The transverse fatigue crack on the external surface of the hollow axle of EMU wasa typical hazard defect.If it is not detected in time,it may cause axle breaking accident.In this paper,an eddy current array inspection method wasproposed,which can effectivelydetect0.3mmdeep artificial crack under the condition of lacquer coatingwith0.3mm thickness,and the detection ability wasbetter than the 1mm deep groove equivalent of the existing ultrasonic flaw detection.This method can be integrated into the existing EMU axle flaw detection process,and used for the review of suspected defects in ultrasonic flaw detection,which have strong practical value.