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What Is The Difference Between Laser Vaporization Cutting And Laser Melting Cutting?

- Dec 03, 2018 -

Laser cutting uses high-energy density laser beams to heat the workpiece, causing the temperature to rise rapidly, reaching the boiling point of the material in a very short period of time, and the material begins to vaporize to form vapor. These vapors are ejected at great speed, forming incisions on the material at the same time as the vapors are ejected.
With the continuous development of the tank industry, more and more industries and enterprises have used laser to cut the tank, and more and more enterprises have entered the tank industry. However, due to the reduced cost of subsequent processing, so, It is feasible to use such equipment in large-scale production.
Laser cutting can be divided into four categories: laser vaporization cutting, laser melting cutting, laser oxygen cutting, laser cutting and control breaking.
Laser vaporization cutting
Using a high-energy density laser beam to heat the workpiece, the temperature rises rapidly, reaching the boiling point of the material in a very short period of time, and the material begins to vaporize and form vapor. These vapors are ejected at great speed, forming incisions on the material at the same time as the vapors are ejected. The vaporization heat of the material is generally very large, so the laser vaporization cutting requires a lot of power and power density.
Laser vaporization is mostly used for the cutting of very thin metal materials and non-metallic materials(such as paper, cloth, wood, plastic and rubber, etc.).
Laser melting and cutting
When the laser is melted and cut, the metal material is melted by laser heating, and then a non-oxidizing gas(Ar, He, N, etc.) is sprayed through a nozzle that is coaxial with the beam, relying on the strong pressure of the gas to discharge the liquid metal to form an incision. Laser melting cutting does not require the metal to be completely vaporized, and the required energy is only 1/10 of that of vaporizing cutting.
Laser melting cutting is mainly used for cutting some non-oxidizing materials or active metals such as stainless steel, titanium, aluminum and its alloys.
Laser oxygen cutting
The laser oxygen cutting principle is similar to oxygen acetylene cutting. It uses lasers as a Preheat source and oxygen and other active gases as cutting gases. On the one hand, the gas emitted by the spray reacts with the cutting metal and undergoes an oxidation reaction, releasing a large amount of oxidation heat; On the other hand, the molten oxides and fluxes are blown out of the reaction zone to form an incision in the metal. Due to the large amount of heat generated by the oxidation reaction during cutting, the energy required for laser oxygen cutting is only 1/2 of the melting cutting, and the cutting speed is much greater than that of laser vaporization cutting and melting cutting.
Laser oxygen cutting is mainly used for easily oxidized metal materials such as carbon steel, titanium steel and heat treated steel.
Laser splicing and control fracture
Laser chips use high-energy density lasers to scan the surface of brittle materials, so that the materials are heated and steam out a small slot, and then apply a certain amount of pressure, and the brittle material will crack along the slot. The lasers used for laser splicing are generally Q switch lasers and CO2 lasers.
The control fracture is the use of the steep temperature distribution generated by the laser slot, which produces local thermal stress in the brittle material and disconnects the material along the slot.

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