Online diagnosis method of laser welding defects based on spectral information

Abstract

The invention provides an online diagnosis method of laser welding defects based on spectral information. The method comprises the following steps: the position of an optical fiber probe is adjusted; information of a photoinduced plasma is acquired to determine a characteristic spectral line; an electronic temperature of the photoinduced plasma is calculated by using the characteristic spectral line to obtain an electronic temperature time domain map; according to materials and sizes of parts to be welded, different welding parameters are used for welding, and the parameter with the smallest standard difference of electronic temperature time domain change is selected as optimal welding parameter; the N parts to be welded are welded under the parameters to obtain N electronic temperature time domain maps so as to obtain a SPC control map; the welding parameters are adjusted according to actual conditions to adjust the parts to be welded to obtain the electronic temperature time domain maps as testing time domain maps; and the testing time domain maps are drawn in the SPC control map in real time to judge if welding defects exist through judging if each point in the testing time domain maps exceeds upper and lower boundaries of the SPC control map. The method can quickly and accurately judge if the defects exist in the laser welding process.

Description

technical field [0001] The invention relates to the field of online diagnosis of laser welding quality, in particular to an online diagnosis method of laser welding defects based on spectral information. Background technique [0002] Laser welding uses a high-energy-density laser as a heat source to melt metals to form welded joints. It is an efficient and precise welding method. In recent years, with the rapid development of aerospace, automotive, microelectronics, light industry, medical and other industries, the shape of product parts has become more and more complex, and the requirements for the surface shape and deformation of welded components have become higher and higher. Traditional welding The method is difficult to meet its needs, so laser welding has received extensive attention. In order to improve the efficiency of laser welding and reduce the defects of welded joints, the online diagnosis method of welding defects is indispensable. The traditional offline det...

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of aerospace, automotive, microelectronics, light industry, medical and other industries, the shape of product parts has become more and more complex, and the requirements for the surface shape and deformation of welded components have become higher and higher. Traditional welding The method is difficult to meet its needs, so laser welding has received extensive attention

In order to improve the efficiency of laser welding and reduce the defects of welded joints, the online diagnosis method of welding defects is indispensable. The traditional offline detection method is time-consuming and laborious and requires professional equipment and related operators.

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