Which auxiliary gas is used for fiber laser cutting machine?

Which auxiliary gas is used for fiber laser cutting machine?

As a general processing method in modern manufacturing industry, laser cutting machine breaks the traditional processing method, especially fiber laser cutting machine. In recent years, it has developed into a “rocket type”. Then, the laser cutting machine must use auxiliary gas during the cutting process. This is also a problem that many users are concerned about. Let’s talk about why the laser cutting machine should add auxiliary gas during the cutting process. And how to use it reasonably. Good auxiliary gas.

First of all, why should we add auxiliary gas to the laser cutting machine?

Before clarifying how to select the auxiliary gas of the laser cutting machine, it is first necessary to understand why we use auxiliary gas.  After years of experience in the laser cutting industry, the use of auxiliary gas can not only blow away the slag in the coaxial kerf, but also cool the surface of the processed object, reduce the heat affected zone, cool the focusing lens, and prevent the dust from entering the lens holder. And cause the lens to overheat. The choice of gas pressure and type has a great influence on the cutting process. The choice of auxiliary gas type will have certain influence on the cutting performance, including cutting speed and cutting thickness.

Second, how to choose the auxiliary gas of the laser cutting machine.

The auxiliary gases that can be used in laser cutting machines are mainly oxygen, nitrogen, air and argon. Below we will introduce the use and characteristics of different auxiliary gases for your reference.

1. air

Air can be supplied directly from the air compressor, so it is very cheap compared to other gases. Although the air contains about 20% oxygen, the cutting efficiency is far less than that of oxygen, and the cutting ability is similar to that of nitrogen. A trace oxide film appears on the cut surfac. The end of the incision is yellow.
The main materials are aluminum, aluminum alloy, stainless copper, brass and so on.

2.nitrogen

Some metals use oxygen to form an film on the cutting surface. The non-oxidized cutting surface has the characteristics of being directly welded, smeared, and highly resistant to corrosion. The end face of the slit is whitish.
The main plates are stainless steel,  brass, aluminum, aluminum alloy, etc.

3.oxygen

Finally , oxygen Mainly used in laser cutting machine to cut carbon steel. While the oxygen reaction heat  increase the cutting efficiency, the resulting oxide film increases the beam spectral absorption factor of the reflective material. The end of the slit is black or dark yellow.
Mainly used for rolling steel, rolled steel for welding structure, carbon steel for mechanical construction, high tension plate, tool plate, stainless steel, plated steel, copper, copper alloy, etc.