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The gas required for the mixed gas is also the original common welding protection gas such as oxygen, carbon dioxide, argon and so on. The mixed gas instead of a single gas for welding protection, has a clear refinement of melt droplets, promote smooth weld bead, improve forming, reduce the rate of porosity of the good effect, by welding, cutting and other industries welcome.

At present, the more commonly used mixed gas can be divided into binary mixed gas and ternary mixed gas according to the type of mixed gas.

ternary gas mixture

1、Argon Oxygen Carbon Dioxide

This is the most widely used ternary gas mixture. It has the comprehensive protection effect of the above two binary gas mixtures. Oxygen aids combustion, which can refine the melting droplets, improve the weld quality and welding speed; carbon dioxide can improve the weld strength and Corrosion resistance, argon can reduce spatter, for the welding of carbon steel, low alloy steel and stainless steel, this ternary gas mixture has the best protection effect.

2、argon helium carbon dioxide

Helium can increase the heat input, can also improve the fluidity of the molten pool, promote weld formation, but because helium is an inert gas,No effect on oxide alloy burning loss of weld metal, so adjusting different proportions can be used for carbon steeland low alloy steel pulse jet arc welding,High-strength steel especially all-position short-circuit transition welding,All-position short-circuit arc welding of stainless steel。

binary gas mixture

1、Argon Oxygen

Adding an appropriate amount of oxygen in argon can effectively improve the stability of the arc and refine the melting droplets. The characteristics of oxygen combustion can increase the temperature of the metal in the molten pool, promote metal flow, reduce welding defects, make the weld bead flatter, and speed up the welding speed. Improve the efficiency of welding operations. And the protective gas of oxygen and argon is widely used, which can be used for welding of carbon steel, low alloy steel and stainless steel of various thicknesses.

2、Argon Carbon Dioxide

Carbon dioxide can improve the weld strength, enhance the corrosion resistance, but pure carbon dioxide protection gas splash is too large, is not conducive to the operation of workers, in which the nature of stable argon mixed, can effectively reduce the metal splash rate, the use of different proportions of oxygen and argon protection gas, for carbon steel and stainless steel welding advantages are obvious.

3、Argon Hydrogen

Hydrogen is a kind of combustion-supporting gas with reducing effect. It can not only increase the arc temperature, accelerate the welding speed, prevent undercut, but also reduce the probability of CO pore formation and prevent welding defects. It is used for nickel-based alloys, nickel-copper alloys and stainless steel. The welding effect is excellent.