Helium Gas For Mig Welding. The reason is that Helium creates a deep and wide penetration that can be largely helpful in welding thicker materials. The four most common shielding gases used in MIG welding are Argon Helium Carbon Dioxide and Oxygen.
Helium is an inert gas which means it doesnt undergo any chemical changes when exposed to other substances. Gas mixtures usually 25 helium and 75 argon are sometimes used and can help to increase travel speeds when AC - gas tungsten arc welding. Argon and helium are the two inert gasses used in both MIG and TIG welding.
This element belongs to the group of noble gasses that do not react with anything.
Mild steel MIG welds using 100 Argon shielding gas are also known for losing ductility. The reason is that Helium creates a deep and wide penetration that can be largely helpful in welding thicker materials. Carbon Dioxide CO 2 Argon Helium and Oxygen. For metals like carbon steel the best shield gas is a 75 argon and 25 carbon dioxide mixture it has a high temperature.