Application Prospect of Infrared Thermography in Nondestructive Testing

From the current application of infrared thermal imager in industrial non-destructive testing, the application of infrared thermal imaging non-destructive testing technology in the petrochemical, power industry, machinery manufacturing and other industrial sectors will have broad prospects.

First, the detection of infrared thermal imaging non-destructive testing technology is non-contact. The results are visualized in the form of color images. The observation of the size and orientation of defects is very convenient, and quantitative calculations can be performed. The most commonly used ultrasonic flaw detection is contact type. The result is determined by the waveform amplitude of the oscilloscope. This will inevitably bring about the influence of subjective factors. Different testers will have different conclusions because they have different experiences and detect flaws on the same work piece. At the same time, ultrasonic detection is affected by stray waves and interface reflections, which can easily lead to false detections and missed inspections.

Second, the detection speed of infrared thermal imaging nondestructive testing technology is very fast. Due to the use of imaging technology, it typically takes a few seconds to detect a part. Especially in the detection of large-area parts, the technology is more superior and can greatly improve the detection efficiency.

Thirdly, infrared thermal imaging non-destructive testing technology is a kind of general-purpose detection technology. It can detect metal and non-disc materials. It is also effective to detect workpieces with complex shapes, poor surface smoothness and finish, or the presence of oxide layers on the surface. For example, the flaw detection of some forged or cast components in vehicles (such as round pins, tie rods, couplers, etc.) can be easily solved using infrared thermal imaging inspection techniques. However, the conventional inspection methods currently used in the service department are difficult to solve. Flaw detection problem, but these parts are the key force components on the vehicle.

Fourth, the detection results of infrared thermal imaging non-destructive testing technology can be stored in memory for a long time. This is very useful for studying the damage law of the workpiece and tracking the detection of some key force or moving parts.

It can be seen from the above that the non-destructive testing technology of infrared thermography has advantages in the testing of castings and forgings that are often moving and subjected to stress, and therefore it will play an important role in the detection of vehicles, exploration, and motors. .

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