Welding method of laser welding machine
Laser welding machine is a new welding method, which uses high power density. In the microsecond time range, the surface layer can be heated to boiling point, resulting in a large amount of vaporization. It is mainly used for welding thin-walled materials and precision parts, spot welding, butt welding, lap welding, sealing welding, etc. It has the advantages of small weld width, fast welding speed, smooth weld, accurate control, small focus, high positioning accuracy and easy automation. What is the welding method of laser welding machine?
There are two different ways or modes to transfer energy from the laser to the welding material. According to the power density, this is the power factor of the laser. In the welding area, the laser welding mode can be conduction mode or keyhole mode. You may already be familiar with it, because this is a common keyhole pattern for manual welding.
It should be emphasized that the type of welding mode is determined by the amount of power transferred to the substrate and the nature of the welding material. The main difference between the two laser welding methods is the transfer of energy to the metal. You can think of conduction patterns as low energy densities, whereas keyhole patterns contain higher energy densities. But remember, energy density is the most influential mode.
And because the energy density is the cross-sectional area of the weld through which the power supply passes, changing the welding ratio or dividing the laser beam power by the defined type will affect the welding mode. Conductive mode welding is basically to heat the weld on the surface of the material to be welded with low energy density. Once the surface is heated, it transfers heat to deeper materials.
Because this welding method is low energy density welding, the weld size on the surface is usually large, and the weld penetration is usually shallow. When you go from low energy density welding to high energy density welding, the mode changes from conduction mode to keyhole mode. Again, the definition of energy density can be achieved by reducing the weld size or increasing the laser beam power. In the simplest terms, keyhole mode welding is welded because of the higher energy density of the holes or holes transferred to the material.
This hole is formed by evaporation of metal. As the beam moves forward, molten metal fills the back of the beam, from the surface of the material to the actual molten part. This is different from conduction mode, in which only the surface is heated and therefore does not penetrate into the weld. The welding effect of laser welding machine is loved by everyone. Laser welding can improve welding strength and high temperature resistance.
The quality of the workpiece welded by laser welding machine is very high, which completely avoids the problem of uneven melting caused by heating, and ensures the product quality
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