The LCD mainboard laser welding machine heats the surface of the workpiece through laser radiation, and the surface heat is guided and diffused internally through heat transfer. By controlling parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool.
Due to laser welding machine unique advantages, it has been successfully applied in precision welding of micro and small parts and welding of thin-walled plates.
After assembling electronic devices and circuit boards and entering the welding station, the LCD mainboard laser welding machine first uses a visual device to visually locate the welding position under the control of the controller. Then, the solder is moved to the above-mentioned welding position through the tin feeding mechanism. The laser welding machine emits laser light to the welding position and begins heating. At the same time, the temperature controller monitors the welding position and measures the temperature of the solder after being irradiated by the laser, When the temperature increases above the melting temperature of the solder, the tin feeding mechanism starts to send out the solder at the set speed. At the same time, the temperature controller monitors the welding temperature. When the welding temperature is higher than the set temperature, the output power of the laser welding machine is reduced by the controller.When the welding temperature is lower than the set temperature, the output power of the laser welding machine is increased to maintain the welding temperature within the set area, preventing damage to the workpiece due to high temperature and preventing welding from being unable to complete due to low temperature.
Due to the fact that laser welding only locally heats the connecting parts without any thermal impact on the component body, and the heating and cooling rates are fast, the joint structure is fine, and the reliability is high. At the same time, laser solder ball welding is non-contact processing, without the stress generated by traditional welding, without static electricity, and is very friendly to components with high thermal impact. For small components, laser processing accuracy is high, and the laser spot can reach the micrometer level. The processing time/power program is controlled, and the processing accuracy is much higher than traditional electric soldering and HOT BAR soldering. The use of small laser beams instead of soldering iron heads can also be operated in narrow spaces. Therefore, laser soldering technology can be widely applied in consumer electronics industries such as LCD mainboards.
