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How much do you know about hand-held laser welding machines today?

by:J&D WATER     2020-02-27
In today's increasingly high requirements for environmental protection and energy conservation, laser welding machine, as an advanced welding process, is becoming more and more popular in the market, especially in close combination with automation equipment. In today's increasingly popular laser welding, how much do you know about the process parameters of laser welding machine? High focus laser welding usually requires a certain amount of defocus, because the power density of the spot center at the laser focus is too high, which is easy to evaporate into holes. On each plane leaving the laser focus, the power density distribution is relatively uniform. There are two ways of defocus: positive defocus and negative defocus. Laser pulse waveform when a high-intensity laser beam strikes the material surface, the metal surface will have 60 ~ 98% of the laser energy is reflected and lost, especially gold, silver, copper, aluminum, titanium and other materials have strong reflection and fast heat transfer. In the process of a laser pulse signal, the reflectivity of metal changes with time. Laser pulse width the pulse width is determined by the penetration depth and the heat affected zone. The longer the pulse width is, the larger the heat affected zone is, and the penetration depth increases with the 1/2 power of the pulse width. However, the increase of pulse width will reduce the peak power, so the increase of pulse width is generally used for heat conduction welding, and the weld size formed is wide and shallow, especially suitable for lap welding of thin plate and thick plate. Power density power density is one of the most critical parameters in laser processing. With higher power density, the surface layer can be heated to boiling point in microseconds, resulting in a large amount of vaporization. Therefore, high power density is very beneficial for material removal processing such as punching, cutting and engraving. For lower power density, it takes several milliseconds for the surface temperature to reach the boiling point. Before the surface vaporization, the bottom layer reaches the melting point, which is easy to form good welding. - Hand-held laser welding machine is facing the increasingly subdivided laser processing market. Laser hand-held laser welding machine saves huge time cost and operation cost of laser welding process and creates greater value for customers.
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