1, the technical feasibility of laser welding

Laser (stimulated emission of light) is the most basic features: color, direction, relevance, these unique properties coupled with the resulting ultra-high brightness, ultra-short pulses and other properties it has been firmly and modern industry together, these qualities are suitable for Welding Electrode. Lasers generally work by laser-generated material to different categories, mainly semiconductors (GaAs, InP, etc.) lasers, solid (Nd: YAG, etc.) laser, gas (CO2, He-Ne, etc.) lasers, liquid (tunable dye, etc.) lasers, chemical lasers, free electron lasers. Gas lasers in which gas or metal vapor as the light particle, it is the most species, the most diverse incentives, the widest distribution area of ​​laser wavelength, easy to implement high-power continuous output, the most widely used class of lasers. Solid-state laser is the laser-generated particles mixed in the solid substrate, its concentration than the gas, therefore the access to relatively large laser energy output, with energy, high peak power, compact, strong and durable. In laser welding of the main shock on the use of these two substances by the laser. Laser welding technology applications in manufacturing increased steadily, from pulse to continuous, from small power to the power, by the thin to thick pieces, from simple to complex shape of the single-slit, laser welding in the continuing evolution has gradually become a mature modern processing technology. Laser welding into a continuous pulse laser welding and laser welding, continuous welding can be divided into heat transfer in welding and deep penetration welding. With the laser output power increases, especially the emergence of high-power CO2 laser, laser deep penetration technology at home and abroad have been developing rapidly, the largest welding aspect ratio has reached 12:1, laser welding materials from the general development of low carbon steel welding galvanized sheet today, aluminum, titanium, copper and ceramic materials, laser welding speed has reached tens of meters per minute, laser welding technology has become more sophisticated, and large number of applications to the production line, in the car welding production line, such as gears, automotive floor and structural parts (including door body) and high-speed welding and has achieved tremendous economic and social benefits.

According to relevant statistics, advanced industrial countries in Europe, 50% -70% of car parts is to use laser processing to complete. Mainly dominated by laser welding and cutting based, laser welding in the automotive industry has become the standard process. Laser welding for body panels can be of different thickness and different coating of coated metal plate welded together, and then stamping, this panel structure made of metal to achieve the most reasonable combination. Laser welding speed of about 4.5m/min, and rarely deformed, eliminating the need for secondary processing. Accelerated the use of laser welding instead of forging parts stamping parts process. Laser welding can reduce the overlap width and some strengthening components, you can also compress the size of their body structural parts. This alone can reduce body weight 56kg. Laser welding for welding roof shell and the frame, drive converter cover weld from the CNC control, the cycle time is about 16 seconds, the actual welding time is only three seconds a day can run continuously for 24 hours. For welding car's gearbox and chassis assembly, laser beam welding speed, easy automation and easy to merge into a flexible manufacturing system, the laser beam to improve the manufacturer's product design into production cycles, reduced product waste rate.
2, laser welding applications in the automotive industry

Using laser welding to the automotive industry can bring enormous economic benefits, such as a large number of spot Aluminum Electrode in car assembly, the two welding head caught in the weld on the edge of the workpiece, the flange width required 16mm, while the welding laser welding is unilateral , only 5mm, the spot of the laser welding, each vehicle can save steel 40kg. Traditional spot welding two pieces of 0.8mm steel plate stamping, the average is 20 points / min, from welding is 25mm, the speed of 0.5m/min, laser welding speed can reach 5m/min more. Laser welding technology, not only reduce costs but also greatly improves production efficiency.