On-line detection method of laser welding penetration

Abstract

The invention relates to an online detection method for laser welding penetration in order to solve the problems that during laser welding, a large quantity of fixed information exists in conventional optical detection signals, time domain and frequency domain change is complicated, signal fluctuation is drastic and laser welding penetration feature information cannot be effectively separated with conventional detection means. The online detection method adopts a special spectrum signal separation method, a specific welding area signal separation method and a welding defect probability distribution feature signal separation method sequentially for processing conventional optical mixed signals according to special state features during changing of the laser welding penetration, so that severe interference to the mixed signals is effectively removed, the reliable welding penetration feature information is simplified and separated out layer by layer, the technical problems that during laser welding, a large quantity of fixed information exists in the detection signals, the time domain and frequency domain change is complicated, the signal fluctuation is drastic and the laser welding penetration feature information cannot be effectively separated are solved, and accurate online identification of the laser welding penetration is realized. The invention can be applied to the online detection method for the laser welding penetration.

Description

Technical field: [0001] The invention relates to an online detection method for laser welding penetration. Background technique: [0002] During laser welding, conventional optical detection signals have a large amount of mixed information, complex changes in the time domain and frequency domain, and severe signal fluctuations. It is difficult to effectively separate the laser welding penetration characteristic information by conventional detection methods. As an advanced special welding process, laser welding occupies an irreplaceable position in various fields of the industry. However, the violent fluctuation of the welding process of laser welding can easily lead to the occurrence of incomplete penetration inside or at the bottom of the weld. Defects will not only greatly reduce the mechanical properties of welded joints, but also form stress concentration points, which will cause cracks after loading, which will have a great impact on the quality of welded products and t...

AI Technical Summary

Problems solved by technology

[0007] An online detection method of laser welding penetration, which is characterized in that: according to the special state characteristics when the laser welding penetration changes, through the conventional optical mixed signal, sequentially adopt Special spectral band signal separation, specific welding area signal separation, and welding defect probability distribution characteristic signal separation are three processing methods, which can effectively remove the severe interference in the mixed signal, simplify and separate reliable welding penetration characteristic information layer by layer, and solve the problem of During laser welding, there are many technical problems in the mixed information in the detection signal, complex changes in the time domain and frequency domain, severe signal fluctuations, and difficult to effectively separate the welding penetration characteristic information, so as to realize accurate online identification of laser welding penetration;

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