（1）3D laser cutting system or industrial robot is used to cut the space curve. Develop various 3d cutting software to accelerate the process from drawing to cutting parts. Titanium plates are cut with argon and nitrogen as processing gases. The laser cutting performance of various materials is shown in the following table when using a CO2 laser source. However, for different materials, due to their different thermophysical properties and different absorption rates of laser light, different laser cutting adaptability is exhibited. Because there is no restriction on the cutting workpiece, the laser beam has infinite copy cutting ability.
When cutting flammable materials such as cotton, paper, the inert gas is been used. As long as the balanced heating gradient is maintained, the laser beam can guide the cracks in any desired direction. The laser beam heats the small area of the brittle material, causing the large thermal gradient and serious mechanical deformation in the region, causing the material to crack. It is estimated that when the steel is cut, the amount of heat released by the oxidation is about 60% of the total energy required for cutting.
The photoelectric conversion efficiency of the fiber laser is about 30%, the photoelectric conversion efficiency of the CO2 laser is 6~10%, and the photoelectric conversion efficiency of YAG laser is only 3%. Read this post to quickly gain a general view of its principles and types. This video displays the welding process of MORN LASER 2000W Auto laser Welding Machine.
Compared with other thermal cutting methods, laser cutting is characterized by fast cutting speed and high cutting quality. When oxygen is used as a processing gas, the cutting edge is slightly oxidized. For plates with a thickness of up to 4mm, nitrogen can be used as the gas for high-pressure cutting.
Combined with the computer, the whole plate can be arranged to save material. During operation, it is only necessary to change the numerical control program to apply the cutting of different shapes of parts, which can perform two-dimensional cutting and three-dimensional cutting. When cutting plastics such as polypropylene, compressed air is been used.
The laser beam focuses on a small point of light, which makes the focal point reach a high power density. combustion material is transferred into slag to control the combustion rate of oxygen and metal, and the speed of oxygen diffusion through the slag to the ignition front has a great impact on the combustion speed. The higher the oxygen flow rate, the faster the combustion chemical reaction and the removal of slag. The principle of laser oxygen cutting is similar to that of oxyacetylene cutting.
We serve a variety of manufacturing industries with direct part marking solutions. A new area of application in recent years is the oil screen seam pipe. Copper and brass are cut only when there is a “reflective absorption” device installed on the system, otherwise, the reflection will destroy the optical components. On the other hand, the molten oxide and the melt are blown out of the reaction area, forming an incision in the metal. Air can be supplied directly from the air compressor, so it is very cheap compared to other gases.
Brazing and soldering are metal joining processes that use a filler metal to join dissimilar materials. Typically these processes will use a laser to melt the filler metal in a controlled and remote process. Laser brazing and soldering are often used on finished components in the automotive and consumer electronics industries.
Laser welding is usually done without filler metals so parts need to have good fit with a gap that’s less than 15% of the thickness of the thinnest component, which limits its scope of use. The use of wire-filled laser welding can greatly reduce the limitations for welding gap. For example, for an aluminum alloy plate with a thickness of 2mm, if no welding wire is used, the sheet gap must be zero to obtain a good weld shape. If a φ1.6mm welding wire is used as a supplementary metal, even if the gap is increased to 1.0mm, the weld can be ensured.
The properties of the material near the slit are also almost unaffected. And the workpiece deformation is small, the cutting precision is high, the geometry of the slit is good, and the shape of the cross-section of the slit is a regular rectangle. ② The surface of the cutting surface is clean and beautiful, the surface roughness is only a few tens of microns, even laser cutting can be used as the last procedure, no need machining, the parts can be used directly. ① The laser cutting incisions are narrow, and the cutting edges are parallel and perpendicular to the surface.
The role of oxygen in the cutting process of carbon steel is to fuel and blow off the molten material. （3）In order to extend the application of engineering machinery and shipbuilding industry, the thickness of low carbon steel has exceeded 30mm. Special attention is paid to the study of the technology of nitrogen cutting low carbon steel to improve the cutting quality of the plate. The cutting speed can reach 600cm/min for 2mm mild steel with 1200W laser cutter while the speed can reach 1200cm/min for 5mm Polypropylene resin plate. The material does not need to be clamped in the laser cutting, which can save not only the tooling but also the auxiliary time of loading and unloading materials. The inherently high speed of laser processing combined with the ease of high-speed automation and elimination of most post-processing steps provide significantly shorter cycle times than competing technologies.
Laser cutting forming technology also has a wide range of applications in the field of non-metallic materials. The cutting quality of the laser cutting machine is an important standard to judge whether the cutting machine is qualified. Compared with oxyacetylene cutting and plasma cutting, there are many kinds of laser cutting materials, including metal, non-metal, metal base and non-metal matrix composites, leather, wood and fiber. However, for different materials, due to their own thermal physical properties and different absorption rate of the laser, they will have different laser cutting adaptability.
From a practical standpoint, the use of beam delivery fiber expands integration options and facilitates the use of the laser in the manufacturing environment. Also, the high reliability, excellent uptime and favorable cost of ownership characteristics. In a fiber laser, the laser light is generated in an active fiber and guided to the work piece by means of a flexible delivery fiber, which acts as a “light guide”. In contrast, the Pulsed Fiber lasers deliver a pulse of energy which is typically ten to twenty times higher than their average power.
This video displays the welding process of our big size auto laser welding machine. This laser welding machine offers a turnkey solution for automated laser welding. Suitable for welding circular welds of stainless steel, carbon steel and other workpieces.
For example, the laser cutter with 2KW laser power been adopted, the cutting speed of carbon steel with 8mm thickness is 1.6m/min. The cutting speed of stainless steel with 2mm thick is 3.5m/min, and the thermal influence area and the deformation are very small. When the laser power and the auxiliary gas pressure are certain, the cutting speed and the slit width maintain a nonlinear inverse relationship.
This non-contact process vaporizes the coating with minimum effect to underlying material, eliminating the need for chemical disposal or abrasive reprocessing. Despite high reflectivity and thermal conductivity, aluminum with a thickness of less than 6mm can be cut, depending on the alloy type and the laser generator capability. Compared with other conventional machining methods, laser cutting has more adaptability.