Many auto parts need to be welded, bonded, bolted, and mechanically joined. Therefore, a simple and reliable non-destructive testing method for welding and bonding parts is required.

With the progress of lightweight and low-cost automobiles, automotive materials include not only steel, but also aluminum, plastic, composite materials, etc., so there are various joining methods, including welding, bonding, and mechanical bonding between dissimilar materials. The reliability and durability of the joint are the focus of attention.

The inspection method for surface defects of many automobile parts is the non-destructive inspection method of applying chemicals. Therefore, the applied chemicals must be removed after inspection. From the perspective of improving the working environment and the health of the operators, non-destructive testing methods without chemicals are required. The following is a brief introduction to some chemical-free non-destructive testing methods.

Light excitation nondestructive testing is the nondestructive testing method of pulse thermal imaging cameras. The pulse thermal imaging camera nondestructive testing method uses the light excitation of the flash lamp to increase the temperature of the inspection object.

During the temperature decrease of the object, the temperature change and the time phase lag in the intact area and the defective area are visualized, and then the method by which defects are inspected. The pulse thermal imaging camera non-destructive testing method is suitable for the non-destructive inspection of the welding area and bonding area of metals with high thermal conductivity. It is an inspection method to capture the instantaneous transition phenomenon between surface defects.

Ultrasonic excitation non-destructive testing uses an ultrasonic vibrator in contact with the inspection object to perform ultrasonic excitation on the inspection object. The internal heat and hysteresis heat caused by the cracks in the inspection object is conducted to the surface of the inspection object. An infrared thermal imaging camera images the thermal state of the surface of the object to be inspected for defect inspection.

When the object is inspected by the ultrasonic excitation inspection method, the internal air bubbles do not generate heat, but a large amount of heat is generated at the tip of the crack, so this method is suitable for the inspection of cracks and the inspection of the mating joint state.

The induction coil excitation inspection method is to inspect the object to be inspected. After the conductive metal is heated by the induction coil without contact, the infrared thermal imaging camera will reduce the temperature of the metal during the temperature change and the time phase lag in the intact area and the defective area. Image, so as to detect defects.

There are two methods for nondestructive testing of induction coil excitation: transmission method and reflection method. The transmission method is a method in which the infrared thermal imaging camera and the induction coil are installed on both sides of the inspection object, and the heat generated inside the inspection object and conducted to the back of the inspection object is used for defect detection.

The reflection method is a method in which the infrared thermal imaging camera and the induction coil are on the same side of the object to be inspected for defect detection. The eddy current generated by the induction coil excites the inspection object and raises the temperature of the inspection object.

At the same time, a uniform magnetic field in the shape of concentric circles is generated on the surface of the inspection object. If there is a crack on the surface of the inspection object, a concentric uniform magnetic field will bypass the crack, resulting in a disordered magnetic field line density difference and uneven distribution of the surface temperature of the inspection object. Infrared thermal imaging cameras detect defects such as cracks based on the uneven distribution of temperature.

Infrared thermal imaging cameras for non-destructive testing should be able to detect the extremely small temperature difference caused by the instantaneous transition phenomenon between the intact area and the defective area, as well as the high time resolution with high sensitivity and high frame rate.

The number of pixels of the infrared thermal imaging camera and the lens used determines the spatial resolution field of view, so when detecting large objects, the field of view becomes larger. When detecting a small area, a magnifying lens is used to reduce the spatial resolution of the pixel.

Therefore, a high-resolution thermal imaging camera with 640×512 pixels-1240×1024 pixels is used. The thermal imaging camera designed and manufactured by ThermTec just meets the requirements of high resolution and has a wide range of applications in many fields.

As a professional manufacturer of thermal imaging cameras, ThermTec always puts the needs of customers first and strictly controls the design and quality of its products. Our products are sold all over the world and have received praise and trust from many customers. We can also provide users with thoughtful one-stop shopping services and effective solution technology. If you want to buy our thermal imaging camera, please contact us immediately!