Multi-wavelength laser welding method and multi-wavelength laser device for multilayer plastic

Abstract

The invention discloses a multi-wavelength laser welding method for multilayer plastic and a multi-wavelength laser device. The multi-wavelength laser welding method comprises the steps that (1) lasers with the corresponding wavelengths are selected aiming at the selectivity of laser wavelength absorption of the to-be-welded multilayer plastic; (2) a semi-reflecting and semi-transmitting lens is adopted for conducting beam combination of the lasers with the different wavelengths, the lasers are coaxially focused to a to-be-welded plastic layer, and thus welding points are coaxial; and (3) a collimation focus lens is adopted for adjusting the positions of the focus points of the lasers with the different wavelengths to be consistent with different layer plastic contact faces, and the multiple layers of plastic absorb lasers and are molten simultaneously. The multi-wavelength laser device comprises a main body structure, a beam combination lens support, a beam combination lens, a two-dimensional translation adjusting frame, a two-dimensional translation adjusting frame transition plate, a first optical fiber adapter, a one-dimensional adjusting frame, a one-dimensional adjusting frame transition plate, a second optical fiber adapter switching plate, a second optical fiber adapter and a collimation lens set. According to the multi-wavelength laser welding method and the multi-wavelength laser device for the multilayer plastic, the transmittance of the upper layer plastic to the lasers does not need to be considered, and diversity of material selection is achieved.

Description

technical field [0001] The invention relates to the field of multi-wavelength plastic welding, in particular to a multi-wavelength laser-based method for plastic welding and a laser. Background technique [0002] The existing prerequisite for using laser welding is that one of the two parts can transmit the laser light and the other part can absorb the laser light. Most plastics allow enough laser light to pass through, and another part that matches it can be converted into a material that can absorb laser beams by adding an absorber (Zhang Huizhong, Experimental research and numerical simulation of laser transmission welding of thermoplastics, 2007 in December). [0003] The plastic material that can pass through the laser can be colorless, transparent or colored, but it must be able to ensure that a sufficient amount of laser light passes through. Many materials cannot absorb enough laser energy because the two transparent plastic layers or the beam does not have enough ...

AI Technical Summary

Problems solved by technology

[0005] Dukane Group has launched a new laser welding system that can weld transparent plastics without the use of laser-absorbing additives. This system uses a 2 μm laser to achieve laser plastic welding, and increases the absorption by adding transparent polymers. A transparent polymer that increases the absorber in the same way

[0006] According to the above analysis, the current technical problem in laser plastic welding is that one of the two layers of plastic materials to be welded must transmit light and the other absorb light, which often leads to the need to add absorbers or transparent polymers to ensure that the materials absorb laser light. , which in turn limits the types of plastic materials, making it difficult to improve the welding effect and speed

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