When using laser welding for workpiece connection, the connection gap of the welded workpiece is almost non-existent, and at the same time, the depth-to-width ratio of welding is large, the deformation after welding is small, the heat-affected zone is small, and the precision is high.Ģ）The welding device is simple and flexible, can be welded at room temperature or under special conditions, and does not have high requirements for the welding environment. With the research and development of high power lasers, laser welding technology is widely used in many fields, mainly because of its following characteristics:ġ) Deep depth, fast speed and small deformation. Laser welding is capable of precise energy control, thus enabling the welding of precision micro devices, and it can be applied to many metals, especially for some difficult metals and dissimilar metals.
Laser welding is a non-contact welding process that does not require pressure, but requires the use of inert gas to prevent oxidation of the molten pool, which is occasionally used for filler metals. Laser welding is a melt welding process in which a laser beam is used as the energy source to impact on the weld joint. Nd:YAG laser, Nd (neodymium) is a rare earth group element, YAG stands for Yttrium Aluminum Tsuge Garnet, the main advantage is that the generated beam can be transmitted through the fiber, 1.06μm, the intensity of the excitation beam can reach 106W/cm2.Ĭommonly used materials include gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), etc. The structure is simple, low cost, and can work continuously and stably, such as CO 2 laser, 10.6μm.ĭye lasers are commonly used, and in most cases, organic dyes are dissolved in solvents (ethanol, acetone, water). The highly focused laser can thus provide welding, cutting and heat treatment functions.Īccording to the light-emitting medium, lasers can be divided into: The medium is excited to a high energy state, and the light wave is amplified due to the reflection of the excited absorption leap light back and forth between the two end mirrors, and enough energy is obtained to start emitting the laser.
It is used in a wide range of applications in the automotive industry. Lasers are better monochromatic, brighter and more directional than ordinary light sources. The induced (excited) photon beam (laser), in which the optical properties of the photons are highly uniform. Laser is “Light Amplification by Stimulated Emission of Radiation”, which is the release of energy in the form of photons when the electrons in an atom absorb energy and jump from a low energy level to a high energy level, and then fall back to a low energy level.
Before we dive into the analysis of laser welding, let’s understand what a laser is.
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