Q：What is arc flash？

A : To make the right choice in selecting a helmet, it is important to understand the meaning of arc flash and what types of emissions radiate from the welding arc. Arc flash is simply the unexpected exposure of the eyes to the welding arc. The welding arc emits several forms of light including ultraviolet (UV), infrared (IR) radiation and high-intensity visible light. Both IR and UV radiation can cause permanent damage - such as retinal burns - to the eyes. While high-intensity visible light may not cause permanent eye damage, it may leave the operator with temporary discomfort, similar to being exposed to the flash of a camera bulb. All helmets that comply with the current ANSI Z87.1 standard (when in the proper down position) always protect operators from the harmful UV and IR damaging elements of the arc. Therefore, when selecting a helmet, the first thing to look for is that the helmet is certified by the manufacturer to comply with ANSI standard Z87.1. Look for labeling on the auto-darkening cartridge to confirm that the helmet does indeed comply with this standard.