Laser cutting machine processing different materials used by the auxiliary gas is different. Cutting the thickness of its auxiliary gas pressure and requirements are not the same. From the cost, the cutting carbon steel with oxygen is relatively cheap, cutting carbon steel is very large amount of nitrogen, the thicker the amount of stainless steel nitrogen and purity are demanding, the cost is relatively large.
Laser cutting machine auxiliary gas is mainly used in:
1, laser gas (laser generator used to generate laser gas)
2, compressed air (usually used to protect the optical path, and some manufacturers also used to do the protection of gas)
3, auxiliary gas (that is, the landlord said from the cutting machine cut the mouth of the gas)
Cutting carbon steel with oxygen, the purity requirements are generally 99.5% or higher. The main role is to burn and blow off the slag. Pressure and flow of each laser cutting machine manufacturers are different, which with the cutting nozzle model size, cutting material board thick and inseparable. Generally require the pressure in the 0.3-0.8Mpa, cut mouth generally 0.02-0.05Mpa. Flow is not good to say, such as cutting 22mm carbon steel, some manufacturers of traffic to reach 10M3 / h (including double-cut mouth protection with oxygen)
Cut stainless steel with nitrogen. The role is used to put an end to the oxidation reaction and blown away slag. The purity of the nitrogen has a high demand (especially 8mm or more of stainless steel, requiring generally to reach 99.999% purity) pressure requirements are relatively large, generally require more than 1Mpa, such as cutting more than 12mm, or thicker to 25mm stainless steel, Higher, more than 2Mpa or higher. Flow according to the type of mouth has changed, but are very large, such as cutting 12mm stainless steel to some manufacturers to 150m3 / h and cut 3mm, as long as 50m3 / h below the flow.
Laser welding machine in the process of welding will use a protective gas, the protection of the gas through the nozzle mouth to a certain pressure injection to reach the surface of the workpiece, but many people do not know why to use the protective gas, the following by the holy horse Gas technician for you to explain why the laser welding machine to use when the protection of gas:
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Cause one: protects the focusing lens from metal vapor contamination and sputtering of liquid droplets
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The protective gas protects the laser welding machine from focusing on metal vapor contamination and sputtering of liquid droplets. Especially during high power welding, it is more necessary to protect the lens due to its very strong spray.
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Cause two: the protection of gas to disperse high-power laser welding plasma shielding is very effective
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Metal vapor absorption of laser beam ionization into a plasma cloud, metal vapor around the protective gas will be due to heat and ionization. If there is too much plasma, the laser beam is consumed to some extent by the plasma. The plasma is present as a second energy on the working surface, making the depth of penetration shallow and the surface of the weld pool is widened. The electron recombination rate is increased by increasing the collision of electrons with ions and neutral atoms to reduce the electron density in the plasma. The higher the neutral atom, the higher the collision frequency, the higher the recombination rate; on the other hand, only the shielding gas with high ionization energy will not increase the electron density due to the ionization of the gas itself.