Laser Cutting

Laser CuttingLaser Cutting is a proven cutting technology that is increasingly used for sheet metal processing (in either flat sheet or hollow section applications) both for the high quality of edge generated and for the high-speed processing it allows. Profiles and apertures are achieved by removing material along the cutting contour with the combination of a laser beam and gas jet.

The high quality edge is achieved with a flow of nitrogen that protects or shields the surface and blows away the molten metal - this is also known as "process gas." It should be free of oxygen for minimal oxidation. Traditional sources of nitrogen (gas cylinders or liquid nitrogen); though pure at origin, always have a minimum oxygen content due to the logistics of distribution. Furthermore, atmospheric oxygen can produce oxidation because some oxygen molecules can reach the cutting zone.

Erre Due produces a wide range of gas generators that solve and eliminate this problem.

The nitrogen "process gas" is purified by adding a small amount of hydrogen to the gas stream (0.5 to 1% produced by a small electrolyte cell installed inside the generator.) Nitrogen is first produced at "standard" quality that includes a small amount of oxygen, and then the "Saturn" machine injects hydrogen into the “process gas.”

 

Practical Evidence
This high purity “process gas” was tested by Erre Due at Italian engineering companies involved in the manufacture of laser cut parts. Laser machines from different manufacturers, including AMADA, BYSTRONIC, MAZAK, PRIMA and TRUMPF were tested. Erre Due collected opinions from the operators, who said that in comparison with the nitrogen sources they had used previously, the high purity gas produced with Erre Due generators gave the following advantages:

 

1) Much brighter cut edge

2) Faster cutting speed 

3) Smoother and improved edge quality