Welding process with laser-induced plasma enhancement

Through the laser-induced plasma enhancement welding process, the coaxial gas composite gas supply system and fuzzy PID control algorithm are used to dynamically adjust welding parameters, solving the problems of welding quality and inefficiency, realizing precise control of plasma morphology and high-quality molding of welding joints.

CN120205997APending Publication Date: 2025-06-27ZHENJIANG YAHENG MACHINERY MANUFACTURING CO LTD
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Patent Information

Application Number
CN202510506387.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-22
Publication Date
2025-06-27

AI Technical Summary

Technical Problem

When the existing welding processes face the needs of special materials or high-precision welding, there are problems such as low welding quality and low welding efficiency. The plasma shielding effect during laser welding leads to laser energy loss, limiting the improvement of welding melting depth and speed.

Method used

Using a laser-induced plasma enhancement welding process, the plasma expansion is dynamically constrained through the coaxial gas-circuit composite gas supply system, combined with pulsed laser beam and high-frequency jitter modulation, the plasma state is monitored in real time by using the time-resolved spectral diagnostic unit, and the welding parameters are dynamically adjusted through the fuzzy PID control algorithm.

Benefits of technology

It realizes precise control of plasma morphology, reduces plasma shielding effect, improves laser energy utilization, enhances the stability of the melt pool and welding quality, solves the problem of unbalanced heat input during welding of different materials, and improves the quality and performance of welded joints.

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Abstract

The laser-induced plasma enhanced welding process comprises the following steps that firstly, active gas and protective gas are synchronously conveyed through a coaxial gas path composite gas supply system, secondly, a pulse laser beam is adopted to act on the surface of a workpiece, and controlled plasma is induced to be generated, and thirdly, laser-induced plasma enhanced welding is conducted. A plasma emission spectrum is collected in real time through a spectrum diagnosis unit, and the characteristic spectral line intensity and broadening characteristics are detected; and 4, the laser power, the pulse frequency and the gas component proportion are dynamically adjusted based on the spectral analysis result. By adopting a coaxial gas path composite gas supply system and arranging an inner-layer active gas channel and an outer-layer protective gas channel, an axial velocity gradient composite gas curtain is formed, plasma expansion is dynamically restrained, and the form of plasma is accurately controlled, so that the problem that the form of the plasma is difficult to accurately control is solved; the energy loss caused by the plasma shielding effect is reduced, and the utilization rate of laser energy is improved.
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