Advantages of argon and carbon dioxide mixtures in the welding process

The large amount of spatter generated during industrial welding is due to the use of carbon dioxide gas for shielded welding, and the emergence of argon and carbon dioxide mixed gas (referred to as argon gas) shielded welding solves this problem. Compared with pure carbon dioxide gas shielded welding, argon and carbon dioxide mixed gas shielded welding further improves welding efficiency and welding quality, while reducing a large amount of spatter.

       First of all, the advantages of argon and carbon dioxide mixture in the welding process

       Pure carbon dioxide is a gas that is heavier than air. It has high thermal conductivity, produces a wider arc, and has a wider weld. Carbon dioxide has strong oxidation, it produces a larger spatter when welding, argon is also a gas heavier than air, it is used for welding can effectively protect the droplets and welding pool, improve the smoothness of the welding surface, less spatter, but argon produced ionization arc narrower, and the arc is unstable. Therefore, these two gases have their own different advantages and disadvantages when used separately for welding, carbon dioxide and argon mixture, so that the advantages of the two gases in welding have been fully played, while avoiding their respective disadvantages, argon composition improves the quality of the welding surface, reduces the splash caused by carbon dioxide gas, and carbon dioxide composition enhances the stability of the arc, heat conduction is improved, thereby increasing the mechanical properties of the welding material, Argon and carbon dioxide mixture are ideal welding shielding gases.

       The use of pure carbon dioxide welding is generally not easy to produce excessive spray, because it makes the welding wire in the welding process to produce larger droplets, in the process of the droplets getting rid of the surface tension down into the welding pool has been subjected to an upward electromagnetic force, because the droplets are large, so the electromagnetic force acts unevenly on the droplets, so that a large number of droplets fall to the outside of the welding pool in the fall, it produces a large number of splashes, argon and carbon dioxide mixed gas can produce excessive spraying, it makes the welding wire droplets become smaller and smaller, When a small droplet falls, the electromagnetic force acting on the droplet is much more balanced than that of a large droplet. Such a large number of small droplets will transition to the molten pool, the generation of spatter will be greatly reduced, the reduction of spatter, so that welding workers do not need to stop often to clean the welding nozzle, nor do they need to use workers to clean the spatter on the seam, mixed gas welding greatly improves the production efficiency of welding, the use of argon and carbon dioxide mixture welding to reduce the spatter is pure carbon dioxide gas welding beyond reach.