1. The advantage of Ar+He argon is that the arc combustion is very stable and the spatter is extremely small. The advantages of helium are high arc temperature, high heat input to the base metal, and fast welding speed. The advantages of both can be obtained by adding a certain amount of helium with

Nitrogen is a colorless and odorless gas under normal conditions and is usually non-toxic. Nitrogen accounts for 78.12% (volume fraction) of the total air. The gas density under standard conditions is 1.25g/L. Nitrogen is difficult to dissolve in water. Under normal temperature and pressure, only 0.

Electronic special gas is a key material in the electronic industryElectronic special gas (referred to as electronic special gas) is an important branch of special gas, and it is an indispensable raw material for the production of electronic industries such as ultra-large-scale integrated circuits (

Compared with oxygen, the chemical properties of nitrogen are very stable, because the two nitrogen atoms that make up the nitrogen molecule form a very stable covalent triple bond. Due to the existence of the nitrogen-nitrogen triple bond, the 3p orbital of the nitrogen atom is completely filled, s