Guide to the MIG Gun
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The MIG welding gun is one of the specialized pieces of equipment needed for this type of welding. The gun is one of the reasons that MIG is so popular. It brings together the consumable electrode wire, electrical current and the shielding gas.
In this prototypical MIG welding gun the current flows from the power source through the gun cable, gun, contact tip to the wire and across the arc. On the other side of the arc, current flows through the base metal to the work cable and back to the power source. The shielding gas flows through the gun and out the nozzle.
The MIG gun has a trigger that enables the welder to easily stop and start. Once the trigger is pressed, the shielding gas starts to flow, an arc is created and the electrode wire starts to move from the gun.