In arc welding, eyes need to be protected against -
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Solution
An electrical arc is an electrical current that discharges itself purposefully or accidentally across a gap between two electrodes using a gas, vapor, or air while putting out comparatively less voltage across the conductors.
Welding arcs emit radiation at a variety of wavelengths, ranging from 200 nanometers to 1,400 nanometers (or 0.2 to 1.4 m, micrometers).
This encompasses visible light (400–700 nm), infrared (700–1,400 nm), and ultraviolet (UV) radiation (200–400 nm).
This is why eye protection from both UV and infrared radiation is necessary.
As a result, while arc welding, it's important to shield the eyes from flying metal pieces and dangerous radiation, such as UV or IR radiation.