Auxiliary Gas in Fiber Laser Cutting | Laser Cutting Auxiliary Gas

The video is talking the auxiliary gas in fiber laser cutting, you can find the types introduction of laser cutting auxiliary gas.
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Hi, I am Clara. Last two weeks, we talked about the “Pierce” setting, if you have not check it, please click the video up here, it is the first one. Today our topic will be the auxiliary gas in fiber laser cutting. As we know, gas is a very important auxiliary helper in cutting. Before get into the video, don’t forget to subscribe to this channel, and give me a “like”, it helps me out immensely,
thank you for your support.
First of all, we need to figure out the role of auxiliary gas, what is it specifically?
1. The auxiliary gas can blow away the slag in the coaxial kerf, so that the cutting will be clean. 2. To cool the metal surface and reduce the heat affected zone. 3. To cool the protective lens to prevent contamination and overheat, so that to cut back the consumables. 4. Some cutting gases can also protect the base metal. Like we use Nitrogen to cut stainless steel against the oxidation
The selection of gas pressure and type has a great influence on the cutting process, and the cutting performance, including cutting speed, cutting quality and other aspects. The quality and purity of the gas also have a significant impact on the cutting effect. For example, the improper gas pressure may cause slags and so on.
In fiber laser cutting, the most common gases we use are oxygen, compressed air and nitrogen.
Oxygen is more likely used to cut carbon steel. It can form an oxide film, so it will improve the laser absorption capacity of high-reflection materials to a certain degree. And there will be a black and shiny cutting section for some oxidizable materials, like carbon steel. However it is a kind of combustion-supporting gas, easy to burn and generate slags. There will be an oxide film on cut surface, and the oxide film will naturally peel off after a long time, which will affect the welding quality if it needs welding after cutting.
Its purity requirements are generally 99.95% or higher. Its main function is to support combustion and blow off the cut melt. The pressure and flow should be based on the nozzle model and size, and the thickness of the cutting material. Generally, the pressure is required to be 0.3-1Mpa, and the flow rate is different according to the thickness of the cutting material. For example, when cutting 22mm carbon steel, the flow rate should reach 10m³/h.
Nitrogen will be applied to cut stainless steel, aluminum and brass. It is kind of suppression gas, not easy to burn and generate slags. It will have the characteristics of corrosion resistance. The maximum air pressure is relatively large, which can improve the cutting speed to a certain extent. However it is expensive compared with air or oxygen. And it asks a higher purity and larger consumption.
There are high requirements for the purity of nitrogen (especially stainless steel above 8mm, which generally requires a purity of 99.999%), and the pressure requirements are also relatively large, generally about 1.5Mpa, if we want to cut more than 12mm, or thicker to 25mm, the pressure is required to be 2Mpa or higher, and the flow rate varies according to the model of the nozzle, but they are all large. For example, cutting 12mm stainless steel requires 150m³/h, while cutting 3mm only requires a flow below 50m³/h.
Compressed air is more suitable for cutting thin metal, like less than 6mm at 8000W. The cutting efficiency of thin plates can be compared with nitrogen cutting, which is an economical and efficient cutting method. First it is cheap, except the upfront investment in compressor purchase, the gas is at low cost. The cut surface will form a micro-oxide film. It can also support combustion, but it will be less easier than oxygen to burn and generate slags. However, it is not recommended when the cutting requirements are relatively high.
If the gas purity is not good, there may be issues occurred. If there is water/oil in the compressed air, or some impurities in oxygen and nitrogen, it may cause the protective lenses damaged, and fluctuations in cutting power, which will also lead to inconsistencies in the front and back of the cutting.
If the gas purity is higher, it will increase the cutting efficiency, but on the other hand, it will increase the gas cost. Let’s take an example. Generally, industrial oxygen purify is 99.9%. Let’s say we are going to cut a 25mm carbon steel. If we enhance the purity to 99.99% or more, the cutting exhibition will be much better, and a 10% cutting speed raise is possible.
So the auxiliary gas is related to our requirements, metal thickness, purchase budget and other factors. And we also need to set suitable pressure to perfect the cutting. Click the video up here, you can find a reference gas pressure setting from 500W to 8000W.

[@SolidArtSENEGAL]

Thanks 🙏

[@nirmalchamara5126]

thank you

[@ClaraChai]

So welcome!

[@industrial.inoxidable]

Thank you very much for all the information and I would like to know where I can find the pressure settings for auxiliary gas according to thickness and type of material to determine the cutting speed. Thankyou so much for the videos . They are helpful.

[@ClaraChai]

First your machine should have the proportional valve, normally it is for the oxygen only.

[@3dtechnologycnc257]

Is it possible to cut 12mm with nitrogen without the criogenic dewar tank and the vaporizer set? just a normal compressed nitrogen cilinder? my cilinder is 9mt3 (9000L) how can i know how many time will last with the 1.5mpa pressure ?

[@ClaraChai]

the gas purity is highly required.

[@fikretduru]

Could you give information about the filters used in air and auxiliary gases? Can you tell us about the air filters?

[@ClaraChai]

Thank you

[@manuelsantiago272]

Hola me puedes ayudar con parámetros para un laser de 1500 w usando aire de compresor, cortando acero al carbono y acero inoxidable

[@ClaraChai]

You can check my video, cutting parameters, thanks

[@gilbertochirinos9972]

Good morning, I operated a 3 kw laser cnc, which I have to keep the auxiliary oxygen gas open when cutting with nitrogen because it throws an alarm of low oxygen pressure, check for leaks and I have not, but I have observed that in cutting with stainless steel having Oxygen pressure at the outlet so that it is not present, this alarm decreases pressure little by little and the brown color cuts me, do you mean that the nitrogen is contaminated with oxygen, has this happened to someone, please? what to do

[@ClaraChai]

Did you set the gas delay?

[@gilbertochirinos9972]

@@ClaraChai Blessed day, Miss Clara, I really don't know where I'm from. With the figure, you'll have a video to show you how to do it, thank you very much for your information

[@ClaraChai]

@@gilbertochirinos9972 I know how to do it? I do know what I am doing.😁😅

[@gilbertochirinos9972]

@@ClaraChai Yes I know, I have seen all your videos, and the one in Spanish, can you help me, in what parameters of cypcut, can I change it, ????

[@ClaraChai]

@@gilbertochirinos9972 I need more information, talk to me on WhatsApp [phone]