LaserSan®

Gas and mixtures for laser cutting and welding.

Competence on laser process

Cutting and welding sheet metal through the laser process requires gases and mixtures of high purity and production precision. In Nippon Gases, through decades of experience in the production of gas and in collaboration with the best manufacturers of laser systems, we have developed production techniques capable of meeting the strictest requirements of manufacturers and beyond.

In our product portfolio, we have all the mixtures for laser resonators marketed with purity titles above the minimum requirements required by manufacturers of laser systems.

Metal reactivity

Every single material requires a specific root protection gas.

Carbon steel, stainless steel, aluminum, titanium and man others have metallurgical different characteristics and a reactivity towards air.

During the laser cutting or welding phases it is essential to protect or bring heat to allow the process, while the absence of pollutants allows to exploit all the power of the laser sources, wheter CO2 or fiber.

The laser cutting is constantly evolving and is moving towards high-quality applications, on a wider range of thicknesses and with good economic results, on batch processing with greater quantity of pieces.

Laser cutting

Thanks to the high focusability of the laser beams, it is possible to obtain narrow and parallel cutting edges, a very reduced thermal altered area, limited thermal distortions, ability to operate on complex profiles and with very small radii of curvature (even sharp edges).

In reality, laser cutting produces finished pieces, which do not require other complementary manipulations (drilling of holes or other) or finishing (sanded or other). In systems using CO2 sources, the laser beam must be directed to the focusing lens through mirrors. It is essential that no polluting substances (dust, hydrocarbons, etc.) are deposited on these components, which cause a greater absorption of the incident power.

This would not only reduce the laser arriving to the material to be processed, but would also cause variations in the transmission conditions and beam focus.

It is therefore important that the entire optical path, from the source to the focusing element, is hermetically closed, and a protective gas (air or nitrogen) flows in slightly overpressure. This gas must be filtered for dust (diameter <0.1 μm, density <0.1 mg / Nm3) and de-oiled (content <0.01 mg / Nm3).

Many times, the failure to comply with this condition leads to serious problems in terms of reliability of the performance of the system

CO<sub>2</sub>

CO2

CO2 have a responsibility to create light emission for effect of energy excitation, that after polarisation, became laser beam.

N<sub>2</sub>

N2

The job of this gas is double, into the source accumulate electron to move to CO2 when it needs to maintain excitation itself, in second as protection of metal sheet during the cutting process.

He

He

Used into the laser source, the effect is to maintain system cooled.

O<sub>2</sub>

O2

Normally oxygen is a problem on laser cutting process, but, as in oxyfuel cutting technology, to cut carbon steel, the function of oxygen is to burn the carbon present into the middle steel to help the fusion.

Gas distribution systems

Gas distribution systems

To supply gas to a laser cutting system it is essential to know fluid dynamics. In fact, it is essential to guarantee high flow rates at high pressures without affecting the machine with pressure changes.

Pressure control panel

Pressure control panel

It is equally important to maintain the purity of the gases contained in the containers up to the point of use. In this case too, the experience and passion that distinguishes us have allowed us to design specific equipment for gas management.

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At Nippon Gases we are called: “The Gas Professionals” for a reason, and it’s because we’ll be able to solve any doubt.

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