Laser spot welding micro-welding spot quality detection device and method based on laser ultrasound

Abstract

The invention discloses a laser spot welding micro-welding spot quality detection device based on laser ultrasound. The laser spot welding micro-welding spot quality detection device comprises a nanosecond pulse laser. Laser emitted by the nanosecond pulse laser reaches the polarizing beam splitter through the half-wave plate. Laser beams are split by the polarizing beam splitter and enter the energy detector and the beam splitter respectively; then, the energy detector is connected with the computer through the energy detector meter head, the beam splitter splits laser beams, the split laser beams enter the photoelectric detector and the light reflector respectively, the photoelectric detector is connected with the computer, and the laser penetrating through the light reflector sequentially passes through the diaphragm and the scanning galvanometer to reach the multi-axis displacement platform; wherein the multi-axis displacement platform, the optical filter and the laser Doppler vibration meter are on the same straight line. The invention further discloses a detection method of the laser spot welding micro-welding spot quality detection device based on laser ultrasound. The device is convenient and efficient, and is suitable for detection of high-temperature extreme environments and complex morphology structural members. The technical scheme belongs to complete non-contact laser micro welding spot nondestructive detection, wherein the scanning speed is high, and the detection result is visual and reliable.

Description

technical field [0001] The invention relates to a welding spot quality testing device and method, in particular to a laser spot welding micro-soldering spot quality testing device and method based on laser ultrasound. Background technique [0002] Laser spot welding (LSW) is an efficient and precise welding method with high energy density laser beam as the heat source, and it is one of the important aspects of the application of laser material processing technology. Widely used in aerospace, automobile industry, nuclear energy, electronics industry. Compared with the traditional welding process, LSW has the advantages of fast welding speed, high heating and cooling rate, high positioning accuracy, small heat-affected zone, and small structural deformation. Since the size of solder joints is usually on the order of hundreds of microns, LSW is especially suitable for precision welding of tiny parts. Although LSW has the above advantages, due to the large number of solder joi...

AI Technical Summary

Problems solved by technology

[0004] Metallographic testing is a destructive test with low efficiency

Ultrasonic testing is a contact testing, which requires the use of coupling media as an auxiliary, and cannot be applied to extreme environments such as high temperature and the testing of structural parts with complex shapes.

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