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Laser welding is one of the most important aspects of laser material processing technology, which is mainly divided into two kinds of pulse laser welding and laser welding.

Pulse laser is mainly used in less than 1mm thickness of thin wall metal material of spot and seam welding, the welding process belongs to the heat conduction type, i.e., the laser radiation heating surface of workpiece, through heat transfer material guiding internal diffusion, by controlling the laser pulse waveform, width, peak power and repetition frequency parameters, enable the workpiece is formed between a good connection. In the 3C product shell, lithium battery, electronic components, mold repair welding and other industries have a large number of applications. The biggest advantage of pulsed laser welding is that the overall temperature of the workpiece is small, the thermal influence range is small, and the workpiece deformation is small.

Most of the continuous laser welding are high power laser, power in the 500 watts or more, the general 1mm above the board should use this laser. The welding mechanism is based on keyhole effects in deep penetration and depth to width ratio, is up to 5: 1 above, welding speed, thermal deformation is small. In the machinery, automobile, shipbuilding and other industries have a wide range of applications. There are a few small power continuous laser, power in the tens to hundreds of watts, and they are used in plastic welding and laser welding of these industries more.