Laser welding machine protective gas types and functions
Laser welding machine is also often called laser welding machine, energy negative feedback laser welding machine, laser welding machine, laser welding machine, laser cold welding machine, laser argon laser welding machine, laser welding equipment, etc. According to their working methods, they can often be divided into laser mold welding machines (manual laser welding equipment), automatic laser welding machines, jewelry laser welding machines, laser spot welding machines, optical fiber transmission laser welding machines, galvanometer welding machines, and handheld welding machines. etc. Special laser welding equipment includes sensor welding machines, silicon steel sheet laser welding equipment, and keyboard laser welding equipment.
Laser welding machines often use inert gas to protect the molten pool during use. When the welded material does not have surface oxidation, the protective gas does not need to be considered. But in most cases, protective gas is still required. Below, Tensileweld Laser engineers will explain to you the types and functions of protective gases for laser welding machines.
Types of protective gas for laser welding machines:
Helium is more expensive, but has the best effect. It allows the laser to pass directly through without obstruction and reach the surface of the workpiece.
Argon gas is cheaper, denser, and has better protection effect. The surface of the weldment is smoother than helium gas. However, it is susceptible to ionization by high-temperature metal plasma, which will shield part of the beam from reaching the workpiece, reduce the effective power of welding, and is harmful to welding. There are obstacles to speed and penetration.
Nitrogen is the cheapest, but it is not suitable for welding some stainless steel.
The function of protective gas for laser welding machine
- Protect the focusing lens from metal vapor contamination and liquid droplet sputtering, especially in high-power welding. Since the spray is very powerful, it is very necessary to protect the lens.
- Protect the workpiece from being oxidized during the welding process. When the laser welding machine uses protective gas, the protective gas must be set first and then the laser is emitted. This can prevent the pulse laser from oxidizing during the continuous processing of the laser welding machine.
- The protective gas can dispel the plasma shield produced by high-power laser welding. The metal vapor absorbs the laser beam and ionizes it into a plasma cloud. The protective gas around the metal vapor will also be ionized due to heat, thereby increasing the three-body collision of electrons with ions and neutral atoms. To increase the recombination rate of electrons and reduce the electron density in the plasma, helium has the best effect.
