Protective gases can be divided into two categories: inert gases and reactive gases. Inert gas refers to helium and argon which does not react with molten welds at all for MIG welding (metal-inert gas arc welding). Reactive gases generally include carbon dioxide, oxygen, nitrogen and hydrogen. These gases participate in the welding process by stabilizing the arc and ensuring that the material is smoothly transferred to the weld. When the majority is used, the weld is destroyed, but in a small amount it can improve the weld characteristics for MAG welding.
The protective gas is used to protect the metal droplets during the soldering process and often plays an important role in the productivity and quality of the solder. The protective gas prevents oxidation of the fused weld during solidification and also blocks impurities and moisture in the air, which may weaken the corrosion resistance of the weld, create pores and weaken the durability of the weld by changing the geometry of the joint. The shielding gas also cools the torch.
Post time: Dec-13-2018