What gases are there in the welding head of a laser welding machine?
There are helium, argon, and nitrogen in the welding head of the holmium laser welding machine.
1, Helium is not easily ioniz (higher ionization energy), which allows the laser to pass smoothly. And the beam energy to reach the surface of the workpiece unhindered. This is the most effective shielding gas in laser welding, but it is more expensive.
2, argon is cheaper and has a higher density, so the protection effect is better. However, it is susceptible to high-temperature metal plasma ionization. As a result, it shields part of the light beam from being radiated to the workpiece, reduces the effective laser power for welding, and damages the welding speed and penetration. Weldments protected with argon are smoother than those protected with helium.
3. Nitrogen is the cheapest protective gas, but it is not applicable to some types of stainless steel welding, mainly due to metallurgy problems, such as absorption, sometimes generating pores in the overlap area.
What kind of gas in a laser welding machine and what effect does it have?
1. Protect the focusing lens from metal vapor contamination and liquid droplet splashing.
Protective gas can protect the focusing lens of laser welding machine from metal vapor contamination and sputtering of liquid droplets. Especially in high-power welding, because its ejection becomes very powerful, it is more necessary to protect the lens at this time.
2, shielding gas is effective for dissipating the plasma shield generated by high power laser welding.
Holmium metal vapor absorbs the laser beam and ionizes into a plasma cloud. The protective gas around the metal vapor also ioniz by heating. If there is too much plasma, the laser beam is consumed by the plasma to some extent.
3. Protective gas can protect the workpiece from oxidation during welding.