Which shade number is shared by the carbon-arc welding entry and the 5/16, 3/8 inch diameter electrodes entry?

Which shade number is shared by the carbon-arc welding entry and the 5/16, 3/8 inch diameter electrodes entry?

• A. 12
• B. 13
• C. 14
• D. 15

Answer: (C)

Shade numbers indicate how dark the welding lens must be to protect your eyes from the bright arc. For high-intensity sources like carbon-arc welding and for larger diameter electrodes, the arc is hotter and emits more UV/IR, so a higher shade is required. In this context, both the carbon-arc welding entry and the entry for 5/16 and 3/8 inch diameter electrodes call for the same protection level, which is shade 14. That makes shade 14 the one they share. The other numbers correspond to different combinations and aren’t common to both entries.

Shade numbers indicate how dark the welding lens must be to protect your eyes from the bright arc. For high-intensity sources like carbon-arc welding and for larger diameter electrodes, the arc is hotter and emits more UV/IR, so a higher shade is required. In this context, both the carbon-arc welding entry and the entry for 5/16 and 3/8 inch diameter electrodes call for the same protection level, which is shade 14. That makes shade 14 the one they share. The other numbers correspond to different combinations and aren’t common to both entries.