What shade number is gas welding (light), up to 1/8 inch?

What shade number is gas welding (light), up to 1/8 inch?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (C)

Shade numbers show how dark the welding lens is. Gas welding relies on an oxy-fuel flame, which is bright but not as intense as an electric arc, so a lighter lens is used for safer visibility. For light gas welding up to 1/8 inch, the appropriate filter shade is four. This level protects eyes from UV and IR radiation while still letting you see the weld clearly. Lighter options (2 or 3) wouldn’t filter enough light for safe exposure, and a darker option (like 5) would make it harder to see the weld when you’re doing light work.

Shade numbers show how dark the welding lens is. Gas welding relies on an oxy-fuel flame, which is bright but not as intense as an electric arc, so a lighter lens is used for safer visibility. For light gas welding up to 1/8 inch, the appropriate filter shade is four. This level protects eyes from UV and IR radiation while still letting you see the weld clearly. Lighter options (2 or 3) wouldn’t filter enough light for safe exposure, and a darker option (like 5) would make it harder to see the weld when you’re doing light work.