A method and system for evaluating the welding quality of ultrafast laser dissimilar materials

Abstract

The invention belongs to the technical field of laser material processing, and particularly discloses an ultrafast laser dissimilar material welding quality evaluation method and system, and the method specifically comprises the following steps: S1, carrying out the laser welding of a plurality of dissimilar material workpieces, collecting corresponding spectrograms during the welding of the workpieces, and obtaining a spectral data set; S2, in the spectral data set, marking successful welding if a spectrogram of continuous spectra appears near the wavelength of 550 nm-750 nm, marking failed welding if an inconsistent spectrogram appears, and obtaining a marked spectral data set; and S3, training a neural network through the marked spectral data set to obtain a welding quality judgment model, and realizing the automatic real-time judgment of the welding quality based on the welding quality judgment model and the spectrograms of the dissimilar material workpieces during laser welding. The spectrum detection and deep learning are combined, the laser welding quality can be monitored online in real time, and the method and the system have the advantages of being high in efficiency, lowin cost, capable of achieving real-time monitoring and non-destructive.

Description

technical field [0001] The invention belongs to the technical field of laser material processing, and more specifically relates to a method and system for evaluating the welding quality of ultrafast laser dissimilar materials. Background technique [0002] The connection of dissimilar materials is widely used in electronic information, automobile manufacturing and other industries. At present, the main connection methods include matching sealing, anodic welding, adhesive bonding, semi-solid connection and so on. But each method has its own limitations, for example: the use of semi-solid connections requires heat pretreatment, which will cause damage to temperature-sensitive components; special equipment is required for anode welding; Poor tightness, poor thermal conductivity and other issues, resulting in reduced reliability and its own use limit. Laser welding is currently widely favored because of its advantages such as high input energy density, deep fusion, small heat-...

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Problems solved by technology

The focus acts on different positions, which will directly affect the success or failure of welding and the quality

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