Types of shielding gas commonly used in welding

Common shielding gas for welding can be divided into single shielding gas, binary mixed gas, ternary mixed gas or even quaternary mixed gas.

A single shielding gas means that only one kind of gas is used as shielding gas during welding, and argon, oxygen, carbon dioxide, etc. are commonly used. Argon gas has stable chemical properties and small thermal conductivity, which can effectively stabilize the arc and isolate the welding area from the air. It can also play a good anti-oxidation effect; oxygen-assisted combustion can increase the temperature of the weld pool, and the molten metal flow is sufficient to reduce Undercutting tendency and leveling of the weld bead not only result in a smooth weld seam, but also can speed up the welding speed; carbon dioxide can improve the strength of the weld seam, not easy to deform and prevent corrosion.

The mixed gas shielded welding that has been popular in recent years is to use a mixed gas that is uniformly mixed according to the ratio during welding. Due to the mixing of more than two gases, combined with the advantages of different gas shields, it can play an excellent bonus to welding. Protection effect.

For example, adding oxygen to argon can improve the quality and speed of the weld; carbon dioxide mixed argon can use the stability of argon to reduce metal spatter. Argon and helium are stable gases. The combination of the two can be used for aluminum , Nickel alloy and other active metals welding, maintain a stable welding state. Not to mention the ternary and quaternary mixed gas, the protective effect of each mixed gas can be achieved by mixing a variety of gases in an appropriate ratio.





Post time: Jun-28-2020
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