What are the shielding gas numbers used in electronic welding?

The choice that includes 1, 2, and 5 corresponds to the commonly used gases in electronic arc welding processes. Each number signifies a different shielding gas or mix, which plays a critical role in protecting the molten weld pool from contamination by atmospheric gases.

In welding, the selection of appropriate shielding gas is vital as it affects the quality of the weld, including penetration, cleaning action, and the overall stability of the arc. For example, using a combination of argon (often referred to as number 1), helium (which could be represented as number 2), and carbon dioxide (sometimes designated as number 5), creates a balanced atmosphere that enhances weld strength and appearance while minimizing defects such as porosity and oxidation.

Understanding these gas numbers allows welders to choose the best combination for their specific application, ensuring optimal results based on the materials being welded and the welding process in use.