Laser welding is one of the important aspects of the application of laser processing technology. Laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling the width, energy, power density and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Because of its unique advantages, it has been successfully used in the welding of small and small parts. The emergence of high-power CO2 lasers and high-power YAG lasers opened up a new field of laser welding. Deep penetration welding based on the pinhole effect has been obtained, and it has been widely used in machinery, automobiles, steel and other industrial sectors.
Handheld laser welding machine
Laser welding characteristics
Laser welding can weld difficult-to-access parts, and can perform non-contact long-distance welding, which has great flexibility. The use of fiber optic transmission technology in YAG laser technology makes laser welding technology more widely used. The laser beam is easy to split the beam according to time and space, and can process multiple beams at the same time, which provides conditions for more precise welding. For example, it can be used for sealing devices such as automobile body thick and thin plates, automobile parts, lithium batteries, cardiac pacemakers, sealed relays, and various devices that do not allow welding pollution and deformation.
Principle of laser welding machine
Laser welding technology has a molten pool purification effect, can clean the weld metal, and is suitable for welding between the same and different metal materials. Laser welding has high energy, which is particularly advantageous for welding metals with high melting point, high reflectivity, high thermal conductivity and very different physical properties.
The main advantages of laser welding are high speed, large penetration and small deformation. Can be welded at room temperature or under special conditions. The laser passes through the electromagnetic field, and the beam does not shift; the laser can weld in air and certain gas environments, and can weld glass or materials that are transparent to the beam. After the laser is focused, the power density is high, and it can weld dissimilar materials with good results. For example, if two materials with different properties are welded together, the qualified rate can reach 100%. Micro-welding can also be carried out. After the laser beam is focused, a small spot can be obtained, and it can be accurately positioned. It can be used in the assembly welding of small and small components of mass automated production, such as integrated circuit leads, clock hairsprings, picture tube electron gun assembly, etc. . Due to the use of laser welding, the production efficiency is high, the heat-affected zone is small, and the solder joints are pollution-free.