What Is MIG Welding?
Mig Welding Wire is used in MIG (Metal Inert Gas) welding and is also referred to as GMAW (Gas Metal Arc Welding) or MAG (Metal Active Gas) welding. It is an automatic or semi-automatic arc welding process. The welding process involves feeding a continuous and consumable wire electrode and shielding gas through a welding gun to weld the workpieces.
MIG Welding Technique
MIG welding is a versatile technique that uses Mig Welding Wire suitable for thick and thin section components. During the process, an electric arc melts the surface of the base materials (materials to be welded) to form a weld pool. It then cools to form a strong bond and join the metals.
During welding, the welder continuously feeds a consumable heated wire electrode and shielding gas through a welding torch. To operate the welding process, the electrode wire is positively charged and connected to an electric power source to deliver a constant voltage. You can also use a constant current system and alternating current.
How To Start
To start the welding process, the wire electrode is brought in contact with the area of the workpieces where welding is to be done. This generates an electric arc between the tip of the electrode and the metal surface. The heat from the electric arc melts both the metal surface and the wire electrode to form a weld pool. The molten weld pool cools to form a strong weld joint. A shielding gas from the welding torch nozzle is fed alongside the electrode to protect the molten weld pool from moisture and airborne contaminants. The selection of shielding gas depends on the metal being welded and the application. During the welding process, the welder gradually moves the welding torch along the joint line of the welding area.
The wire electrode can be solid or cored with its diameter ranging between 0.6 mm to 1.6mm. It serves both as a heat source (via an electric arc at the contact tip) and filler metal for the welding joint. The wire melts and is used in the welding process making it a consumable electrode. During welding, the wire is fed through the torch’s contact tip (copper contact tube) which conducts welding current into the wire electrode.
In semi-automatic MIG/MAG welding, the wire feeding rate and arc length are controlled by the power source. However, the welder manually controls the wire position and travel speed. In automatic MIG/MAG welding, no manual intervention is required to carry out the process.