Firstly,laser welding is an efficient and precise welding method that uses a high energy density laser beam as a heat source.
Laser welding can be achieved by continuous or pulsed laser beams. The principle of laser welding can divide into heat conduction welding and laser deep welding.
Power density less than 104~105 W/cm2 is heat conduction welding.
At this time, the penetration depth is shallow and the welding speed is slow;
when the power density is greater than 105~107 W/cm2, the metal surface is recess into “holes” under the action of heat, forming deep penetration welding.
Secondly,features of fast welding speed and large aspect ratio. Laser welding generally uses continuous laser beams to complete the connection of materials.
The metallurgical physical process is very similar to electron beam welding, the energy conversion mechanism is complete by a “key-hole” structure.
Thirdly,under sufficiently high power density laser irradiation, the material evaporates and forms small holes.
This small hole filled with steam is like a black body, absorbing almost all the energy of the incident beam. The equilibrium temperature in the cavity is about 2500C.
The heat is transfer from the outer wall of the high-temperature cavity, melting the metal surrounding the cavity.
The small holes are fill with high-temperature steam generat by the continuous evaporation of the wall material under the beam of light.
The four walls of the small holes surround the molten metal and the liquid metal surrounds the solid material.
The liquid flow outside the hole wall and the surface tension of the wall layer are consistent with the steam pressure continuously generated in the hole cavity and maintain a dynamic balance.
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Fiber Laser Welding Cleaning Cutting Machine
Fiber Laser Welding Machine