What is a common feature of welding helmets?

A common feature of welding helmets is their ability to provide UV protection. During the welding process, the intense light emitted can produce harmful ultraviolet (UV) radiation that poses a risk to the welder's eyes and skin. To mitigate this risk, welding helmets are specifically designed with filters that shield the user from UV rays, ensuring that the welder can work safely. This protective function is crucial in preventing long-term damage, such as cataracts or skin burns.

While there are other technologies in various tools and equipment that may enhance color perception, amplify sound, or filter smoke, those are not characteristic features of welding helmets. The primary function of these helmets is to ensure the safety and health of welders against the harmful effects of the welding arc and environment, making UV protection a vital and defining feature.