Handheld laser welding machine welding why to use protective gas?

Handheld laser welding machine which is a new type of welding method, mainly for thin wall material, precision parts welding, which can realize welding, butt welding, welding stack, seal welding, such as depth ratio is high, the weld width is small, small heat affected zone, small deformation, welding speed, welding seam smooth, beautiful, without treatment after welding or simple processing, high weld quality, no pores, can accurate control, Small focusing spot, high positioning accuracy, easy to realize automation. Handheld laser welding machine welding why to use protective gas? There are three reasons for this. Reason 1: it can protect the focusing lens from metal vapor contamination and sputtering of liquid droplets Protective gas can protect the focusing lens of laser welding machine from metal vapor pollution and sputtering of liquid droplets, especially in high power welding, because the ejecta becomes very powerful, at this time, the protective lens is necessary. Reason 2: The shielding gas is effective in dispersing the plasma shielding created by high-power laser welding The metal vapor absorbs the laser beam and ionizes into a plasma cloud. The protective gas around the metal vapor will also be ionized due to heat. If there is too much plasma present, the laser beam is consumed by the plasma to some extent. As the second kind of energy, plasma exists on the working surface, which makes the welding depth become shallow and the welding pool surface become wide. The electron density in the plasma can be reduced by increasing the electron recombination rate by increasing the electron collision with ions and neutral atoms. The lighter the neutral atom, the higher the collision frequency and the higher the recombination rate. On the other hand, only protective gases with high ionization energy do not increase electron density due to the ionization of the gas itself. Reason three: protective gas can make the workpiece in the welding process from oxidation Laser welding machine must use a kind of gas protection, and the program should be set to first out of the protective gas and then out of the laser way, to prevent in continuous processing, pulse laser oxidation phenomenon. And inert gas can protect the molten pool, when some materials welding do not care about the surface oxidation is not to consider protection, but for most applications are often used helium, argon, nitrogen and other gases for protection, so that the workpiece in the welding process from oxidation. This is why the laser welding machine is used to protect the gas. Reminding you that helium is generally used as a protective gas, which can inhibit plasma to the maximum extent, thus increasing the depth of penetration and improving the welding speed; And light can escape, not easy to cause stomata. Of course, from our actual welding effect, the argon protection effect is also good.铜焊丝,Copper Welding Rods,铝焊丝,aluminium welding wire,镍焊条,Nickel electrode,药皮焊条,Flux Coated Brazing Welding Rods