Which numbers do shielding gases typically end with?

Shielding gases used in welding processes, such as argon, carbon dioxide, and helium, are represented by specific codes as defined by the American National Standards Institute (ANSI) and the Compressed Gas Association (CGA). These gases typically have designations that end with the numbers 1, 2, and 5. For instance, argon is denoted by the number 1, carbon dioxide corresponds to the number 2, and helium is labeled with the number 5 in these classifications.

Understanding the numbering system for shielding gases is essential for welders and fabricators to select the appropriate gas for their specific welding process, as different gases provide different properties and benefits. For instance, a mix of argon and carbon dioxide is common in GMAW (Gas Metal Arc Welding) for improving arc stability and weld bead appearance.

The other options consist of numbers that do not represent common shielding gases used in welding, making them incorrect in this context. Recognizing the correct identifiers helps ensure effective and safe welding operations.