What shade of lens is typically used in arc welding?

In arc welding, a shade 10 lens is commonly used because it provides a suitable level of protection against the intense brightness and harmful ultraviolet (UV) and infrared (IR) radiation produced during the welding process.

Shade 10 allows the welder to see the work clearly while still providing adequate eye protection. It strikes a balance between visibility and safety, as a lens that is too dark would hinder the welder's ability to see the workpiece and the quality of the weld, while a lens that is too light would not offer sufficient protection from the harmful rays produced by the arc.

In varying welding processes and conditions, other shades may be recommended. For instance, lighter shades (like 8) may be used in specific applications or for tasks that require less bright illumination, and darker shades (like 12 or 14) may be used in specialized situations with very high levels of light and radiation. However, shade 10 is the most versatile and commonly accepted standard for general arc welding practices.