Actively-motivated welding line defect infrared intelligent detection system and method

Abstract

The invention relates to the technical field of the welding line defect nondestructive detection, and especially relates to an actively-motivated welding line defect infrared intelligent detection system and method. The infrared intelligent detection system for welding defect detection is composed of a driving device, a regulating device, a high-definition camera, an upper computer, a signal generator, a laser pulse gauge, an infrared thermal imager and a code-spraying mark device, different types of welding slot defect can be detected, the infrared intelligent detection system of the welding slot defect can acquire a welding slot trend through the high-definition camera, the laser pulse gauge is used for emitting active laser pulse to perform thermal excitation on the welding slot region, the infrared thermal imager acquires an infrared thermal image, an upper computer system performs image processing on the infrared thermal image, and distinguishes the welding slot defect in real time, and the code-spraying mark device is controlled to automatic identify the welding slot defect location. The intelligent continuous detection of the welding slot defect can be realized, all welding slot defects can be effectively distinguished, and the system has the features of being energy-saving and environment-friendly, efficient and accurate, intelligent and continuous and safe and reliable.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of weld defects, in particular to an active excitation infrared intelligent detection system and method for weld defects. Background technique [0002] Weld seam defects refer to the defects formed during the welding process of the welded joints, mainly including pores, slag inclusions, incomplete penetration, incomplete fusion, etc. Due to the influence of metal materials and welding processes during the welding process, it is difficult to Avoid the occurrence of weld defects, which will reduce the cross-sectional area of ​​the weld, generate stress concentration, reduce the structural bearing capacity and fatigue strength, and bury hidden dangers for structural safety. Therefore, efficient and accurate detection of weld defects is the key to ensure welding quality. [0003] In the prior art, non-destructive testing technologies for weld defects mainly include ultrasonic testin...

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Problems solved by technology

[0003] In the prior art, non-destructive testing technologies for weld defects mainly include ultrasonic testing, radiographic flaw detection, magnetic particle testing, and penetrant testing, among others. Detecting internal defects has a wide range of applications, but it is not high for some small cracks and unfused reflected waves, which may easily lead to missed inspections; radiographic flaw detection uses various rays to pass through the workpiece to be inspected. Due to the discontinuity in the structure, the Rays produce attenuation, absorption or scattering, and then form an image on the recording medium. Real-time imaging can be used to intuitively measure the weld defects of thin-walled workpieces. However, ray inspection is harmful to the human body and expensive. The cost of protection is high; After the material is magnetized, due to the existence of discontinuity, the magnetic field lines on the surface of the workpiece will be locally distorted. Applying magnetic powder on the surface of the workpiece will form visible magnetic marks, thereby showing the position, size, shape and severity of the discontinuity. However, magnetic powder The detection is not suitable for non-ferromagnetic materials, nor can it detect defects that are deeper from the surface; penetration testing means that after a penetrant is applied to the surface of the part, under the action of capillary phenomenon, the penetrant can penetrate into the surface after a certain period of time. In the open defect, after removing the excess penetrating fluid and drying it, the imaging agent is applied on the surface of the workpiece. Under the action of a certain light source, the trace of the penetrating fluid at the defect is displayed, so as to detect the shape and distribution of the defect. However, the sensitivity of penetrant detection is low, the requirements for surface finish are high, and the depth cannot be detected.

[0004] The above-mentioned weld seam detection technologies have limitations, and cannot effectively detect all weld seam defects; in addition, the weld seam detection methods in the prior art require human operation and interpretation, which increases the subjectivity of weld seam defect detection; and the detection process Most of them are intermittent detection, the detection efficiency is low, and the detection process is cumbersome

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