Misc. Lenses FAQs
Answers to common questions about replacement cover lenses and protective plates for welding helmets and auto-darkening filters.
What is the difference between an inner and an outer cover lens?
The outer (front) cover lens sits in front of the welding filter and takes the sparks, spatter and grinding debris so the filter behind it does not have to. The inner cover lens sits on the wearer's side of the filter and is replaced if it becomes damaged, for example cracked or pitted.
Both are clear, replaceable parts. Many helmets use both, some use only an outer lens, so check the manual for which positions your helmet has.
Can I clean a cover lens, or should I just replace it?
Light dust and smears can usually be wiped off gently with a clean, lint-free tissue or cloth. Helmet manuals advise against strong cleaning solutions, and recommend keeping the filter's sensors and solar cells clean in the same way.
Do not scrub at spatter that has fused to the surface, because that scratches the lens. Once the surface is pitted or scratched, cleaning will not restore it and the lens should be replaced. Follow the cleaning advice in your helmet's manual.
Why must I use a cover lens at all?
The welding filter is the part that protects your eyes from the arc, and it can be damaged by spatter, sparks and grinding debris. A cover lens takes that wear, so the filter stays clear and works as designed for longer. Makers describe cover lenses as sacrificial parts that protect the more delicate filter behind them.
Running a helmet without its cover lens, or with a badly pitted one, risks damage to the filter and a poorer view of the work. Treat it as a consumable rather than an optional extra.
Why does the view go dim or hazy even with a good filter?
A dirty or damaged cover lens is one of the commonest causes. Helmet manuals list a dirty or damaged front cover lens in their troubleshooting section, with the fix being to change the lens. Replace it with a fresh one and the view often improves straight away.
Other causes can include the shade setting, a dirty filter or sensors, or a low battery on an auto-darkening unit. Check the lens first because it is quick and simple. If the view is still poor, refer to the manual or ask the maker, and do not carry on welding with a view you cannot see clearly.