What is a common safety precaution when performing arc welding?

Protective eyewear is essential when performing arc welding because it serves to safeguard the eyes from the intense light and harmful radiation produced during the welding process. The intense ultraviolet (UV) and infrared (IR) light generated can cause severe eye injuries, including "welder's flash" or burns to the cornea. Proper protective eyewear, typically with specialized lenses, ensures that a welder can see the work clearly while also protecting against these dangers.

In addition to eye protection, safety clothing, such as flame-resistant gear, is crucial to cover the skin and prevent burns from sparks and spatter. Therefore, wearing loose-fitting clothes is not advisable as they can easily catch fire or allow sparks to penetrate to the skin. While a metal helmet, often used in different welding processes, provides some protection, it is not widely standard for arc welding specifically. Lastly, using one type of electrode for all materials can compromise the quality of the weld and increase safety risks, as different materials require specific electrode types for optimal performance. This critical consideration underscores the importance of dedicated protective measures in ensuring a welder's safety.