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论述了红外热象技术的原理及其在机械零部件故障诊断中的应用，文中给出了对金属结构件内部焊接缺陷检测的应用实例。
The principle of infrared thermography and its application in the fault diagnosis of mechanical components are discussed. The application examples of the detection of welding defects in the metal structure are given in this paper.