Laser welding optimization method based on laser induced plasma spectroscopy and device thereof

Abstract

The invention discloses a laser welding optimization method based on laser induced plasma spectroscopy and a device thereof. The method comprises the following steps of: initially setting N welding parameters and randomly selecting one of the welding parameters as a variable welding parameter; adjusting the value of the variable welding parameter and collecting a plasma spectral signal of a welding workpiece in a laser welding process under each of the variable welding parameters; calculating the plasma relative excitation temperature according to the plasma spectral signal and obtaining the plasma relative excitation temperatures corresponding to different variable welding parameters thereby; and selecting the variable welding parameter corresponding to the optimum welding quality as the optimized result. The method has the advantages of being simple to operate and capable of quickly determining proper laser welding parameters and improving the laser welding quality. The laser welding device disclosed by the invention comprises a laser, a spectrum collecting focusing probe, a spectrograph, a signal processor and the like, and has the advantages of being flexible to adjust and capable of acquiring the laser induced plasma spectral signal which is good in signal quality.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser-induced plasma spectrum-based laser welding optimization method and a device thereof. Background technique [0002] With the rapid development of modern industry, laser welding has become a fast and high-quality key connection technology. Laser welding has the characteristics of small deformation and residual stress, high tensile strength, and large processing flexibility. However, the selection of laser welding process parameters is interfered by many factors. During the laser welding process, the workpiece is prone to encounter problems such as incomplete penetration, undercut, collapse, air holes, and slag inclusions. The selection of welding process parameters that can meet the processing requirements is the key to laser welding. Key technologies and problems that need to be solved urgently. [0003] Through the in-depth study of the photoinduced plasma genera...

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Problems solved by technology

The plasma height is only 5mm during 4kW optical fiber welding. In actual production, the existing spectrum acquisition equipment is difficult to ensure that the plasma position is relatively consistent each time, and it is difficult to compare and analyze the spectral data generated by using different process parameters.

However, the above studies only used the laser-induced plasma spectral signal for welding penetration analysis, and did not correlate the plasma spectral signal with the entire welding process, so it was impossible to obtain better welding status and Process parameters

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