What numbers do shielding gases typically end with?

Shielding gases, which are essential in various welding processes to protect the weld pool from atmospheric contamination, typically have a designation that ends with the numbers 1, 2, and 5. This classification aligns with the American National Standards Institute (ANSI) and the specific identification standards for gases.

For instance, argon is commonly designated as 100, helium as 200, and carbon dioxide as 300 in the context of shielding gases used in arc welding processes. These end digits indicate specific types of gases that are widely used in both MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas) welding.

Understanding the designation system is crucial for welders to select the appropriate gas for their specific welding application. Since proper shielding gas selection plays a significant role in the quality of the weld, knowledge of these designations helps ensure optimal results during the welding process.