Auxiliary gas is often used for shielding when welding with a handheld laser welding machine. Auxiliary gases are usually inert gases, which are colorless, odorless, and difficult to chemically react with other substances. Because of their extremely inactive chemical properties, they are often used to isolate the air in welding. The principle is to spray the inert gas to the surface of the workpiece with a certain pressure through the nozzle, so as to avoid some gases in the air from oxidizing the weld seam. So how to choose and use auxiliary gas is very important for welding quality.

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