3. Helium he

He has the highest ionization energy and low ionization degree under the action of laser, which can well control the formation of plasma cloud. Laser can well act on metals and micro welders. Moreover, he has very low activity and basically does not have chemical reaction with metals. It is a good weld protective gas. However, the cost of he is too high. Generally, mass-produced products will not use this gas, He is generally used for scientific research or products with very high added value.

Helium cylinder

Selection principle of blowing mode of shielding gas

1. First of all, it should be clear that the so-called "oxidation" of the weld is only a common name. Newred reminds you that theoretically, it means that the weld has a chemical reaction with harmful components in the air, resulting in the deterioration of the weld quality. It is common that the weld metal has a chemical reaction with oxygen, nitrogen and hydrogen in the air at a certain temperature.

2. To prevent the weld from being "oxidized" is to reduce or avoid the contact between such harmful components and the weld metal under high temperature. This high temperature state is not only the molten pool metal, but the whole time period from the time when the weld metal is melted to the time when the pool metal solidifies and its temperature drops below a certain temperature.

Type of laser welding protection gas (1)：http://newradargas.com/NEWS/PRODUCTS/719.html