Depending on the application, various gases are used in the MIG (metal inert gas) welding process. From argon to carbon dioxide, each gas plays a part in determining how deep the weld penetrates metal, preventing oxygen from damaging materials, and assisting the mechanical components. The gases are categorized as inert and active. Knowing more about each will leave you better prepared to use them correctly for your project.  

Inert Gases Shield the Weld Pool From Oxygen & Water Vapor

Inert gases have a passive role in physically creating a MIG weld, but still serve an important function in ensuring the quality of the application. If oxygen and water vapor penetrate the weld area, it could compromise the integrity of the finished product. Inert gases, such as argon, shield the weld pool from these threats. Inert gases lack the power to help mechanical components manipulate the metal materials. If inert gas is relied upon heavily to do more than its primary function, machinery with a higher power capacity would be needed for the job. The best results are also not guaranteed. 

Active Gases Are Used to Help Penetrate Materials

Because inert gases lack the ability to help penetrate metals used for the weld, active gases are applied. Although these gases fall under the general MIG category, the process is more accurately referred to as MAG (metal active gas) welding. Active gases typically include carbon dioxide and argon. With it, welders can achieve the desired results of a soft weld arc and smooth finish. The percentage of argon and C)2 used for the application depends on the thickness of the steel used in the weld.   

Regardless of the scope of your MIG welding project, you’ll find all the materials needed for the job at Wayne Oxygen & Welding Supply. With three convenient locations in Charlottesville, Harrisonburg, and Waynesboro, VA, the store is known throughout the area for its selection of machinery and safety gear by Lincoln Electric® and Miller Electric®. To inquire about the inventory in Waynesboro, call (540) 942-4145. Reach out to the Charlottesville location at (434) 295-2334, and the Harrisonburg branch at (540) 434-1235. You can also visit the company online for a closer look at the compressed gas and equipment they carry.