Shielding gases surround the live electric currents used in all methods of welding. They are employed to keep the current steady, preventing erratic movement, which makes welding much easier and allows for more precise welding. Different shielding gases are employed in MIG welding, depending on the workload. Carbon dioxide shielding gases are the most efficient shielding gases to use when welding on thicker steel. A shielding gas featuring 25 percent carbon dioxide and 75 percent argon is recommended for use on thinner gauge steel. Argon by itself or in combination with helium is an efficient shielding gas for welding on aluminum. For welding on stainless steel, a combination of argon, helium and carbon dioxide is recommended.
Welding involves using live electric currents. A proper ground is essential in providing a constant, uninterrupted stream of electricity while welding. Sometimes it can be difficult to start MIG-welding equipment. Proper grounding also allows for quicker starting voltages. Copper is one of the most efficient electrical conductors available. Unfortunately, most modern grounding clamps are manufactured with plated steel featuring a small amount of copper on the clamps, according to Welding Tips and Tricks. Older grounding clamps used to be created out of 100 percent copper. They are much more efficient at providing starts and can still be purchased at certain locations.
It can be exceedingly difficult to weld one-handed. The welder should steady her welding gun with both hands while MIG welding. This allows for more accurate and even welds. The electric current in MIG welding is drawn through a contact tip at the end of the welding gun nozzle. This contact tip should protrude about 1/4-inch from the nozzle to create efficient welds. For welding applications involving very thin sheet metal, having the contact tip stick out 3/4-inch will make welding easier.