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MAG welding

Joining process created by the continuous supply of a metal electrode, which is melted in an electric arc protected by an active gas.

Illustration of MAG welding

The process

Before processing can begin, the planned joint surface has to be cleaned to prevent contamination during the welding process. This also makes the joint easier to secure.

A spool [1] feeds a metal wire constantly, which also acts electrode. The workpiece and the electrode are connected to a power source, and this causes an electric arc. This creates a high amount of heat energy, which leads to the electrode and parts of the workpiece to be melted and finally create the desired weld joint.

An external gas tank supplies the process with an active gas [2]. The aims to create a protective atmosphere for both the arc and melt. The gas is composed of a mixture of argon, carbon dioxide, and oxygen, and its composition is critical to the method to generate good results.

In cases where a small weld is desired, and the accessibility exists, finishing in the form of grinding is applied.