As a new welding process, handheld laser welding machines are becoming more and more popular in the metal welding market. Laser welding technology is easy to operate, high precision, fast welding speed, smooth and beautiful welding seam. So do you need to use shielding gas when using a laser welding machine? This post answers that question for you.

 

Fiber laser welding machines need to use inert gas to protect the molten pool during metal welding. Usually helium, argon, nitrogen, etc. are used as shielding gases to reduce oxidation reaction during metal welding, so that blackening can be effectively reduced during welding. In addition, the shielding gas can also suppress the metal vapor pollution generated during the welding process and the spatter after the metal melts, so as to protect the lens.

 

The shielding gas is injected through the nozzle mouth with a certain pressure and reaches the surface of the workpiece. The hydrodynamic shape of the nozzle and the diameter of the outlet are very important. It must be large enough to drive the shielding gas ejected to cover the welding surface. However, in order to effectively protect the lens and prevent metal vapor pollution or metal splashes from damaging the lens, the size of the nozzle should also be limited.

 

Shielding gas is very important for laser welding metals, not only to protect the lens, but also to obtain a more ideal welding effect. Therefore, in the laser welding process, the use of protective gas is very necessary.