A wide range of plastic products in our production and life can be seen everywhere, plastic material processing methods is also a wide range of methods for the thermoplastic only for more than 15 kinds of welding, such as: heating tools welding, ultrasonic welding, vibration friction welding However, for the three-dimensional geometry, hollow body, large parts and other products, the above processing methods more or less there are some technical problems, and laser welding a good solution to these problems.
A wide range of plastic products in our production and life can be seen everywhere, plastic material processing methods is also a wide range of methods for the thermoplastic only for more than 15 kinds of welding, such as: heating tools welding, ultrasonic welding, vibration friction welding But for the three-dimensional geometry, hollow body, large parts and other products, the above processing methods more or less there are some technical problems, and laser welding a good solution to these problems.At present, the laser welding plastic methods can be divided into Non-contact laser welding and laser transmission welding, where we mainly introduce laser transmission welding. Laser transmission welding refers to the laser beam through the laser plastic to reach the surface of the absorption of laser plastic, with the heat generated by the laser beam on the contact surface, so that Plastic contact surface melting, and thus the thermoplastic components bonded together.This method of welding can be used not only in lap joint welding, but also can be used in butt joint welding, but also gradually applied to automotive clutches, brake parts , Engine cover lift, car lights, etc. The principle of laser welding plastic is: two kinds of plastic Under low pressure are clamped together, through the optical system consisting of mirrors, lenses or optical fibers, the laser beam focused on the area to be welded to form a heat-affected zone, one of the plastic is transmitted to the near infrared laser, Another kind of plastics absorbs the laser, the plastic that absorbs the laser energy converts the light energy into the heat energy, melts on the contact surface of the plastic, meanwhile the heat is also transmitted to the plastic surface that transmits the near infrared light, forms the melting area. , The melting zone to produce intermolecular mixing, when the melt size to meet the required requirements, remove the laser heat source, under the continued pressure of the role of a certain pressure to form a weld after cooling, laser plastic welding to achieve transparent.In order to improve the absorption properties of the upper plastic , Often adding absorbent; In addition, in order to improve the permeability of plastic through, often adding highly transparent dye.
The main advantages of laser plastic welding are: 1) The use of high energy density laser heat source, to achieve the plastic joint surface temperature optimization, to ensure that the plastic laser welding process of high speed and precision.2) Through the laser beam shape and size changes, the heat affected zone And the bonding area is controlled to a very small extent. The outer surface of the welding area can not see the traces formed by welding and the damage caused by the welding can not be seen. 3) The components are assembled before welding, and the welding process is very easy. ) There are no restrictions on the shape and size of the parts, so that the design freedom of the parts is greatly improved. 5) There is no vibration during welding, which is very beneficial to vibration-sensitive parts such as electronic components and medical devices 6) Non-contact processing (no physical contact between connected components and heat source), easy maintenance of hygienic safety of medical and food equipment, etc. 7) High degree of freedom of laser beam transmission, easy to automate 8) Toxic smoke, etc., the welding site safe and reliable. Transmitted laser welding heat source Laser transmission welding uses infrared laser as the welding heat source, the wavelength is 980nm, and the power level is 30W-200W optical output semiconductor laser according to the welding size and material.Kaplin Photoelectric 60W-200W semiconductor laser with integrated high precision control System, with non-contact welding, a small heat-affected zone and the temperature controllable solder joints, etc., used in plastic welding.
