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4 1/4" x 2" Back Lens BS679
Practical answers on choosing, fitting and looking after the small-format shaded, cover and back lenses used in many fixed-shade helmets.
It can, but only with the right eyewear. When eyewear fitted with welding filter lenses is worn under a helmet, the shade in the helmet may be reduced, so long as the combined shade of the eyewear and the helmet lens still equals the value the chart requires.Ordinary tinted safety glasses and sunglasses are not welding filters and do not count towards the shade. Do not reduce the helmet shade unless the eyewear is marked as a welding filter and you have worked it out against a recognised chart for your process and current. Check the helmet and eyewear instructions and your risk assessment. If you are unsure, use the shade the chart gives for the helmet lens alone.
Older lenses often carry markings from standards that have since been replaced. The current standard series for welding eye and face protectors is EN ISO 16321, with Part 2 covering welding.An old marking does not by itself mean a lens is unsafe, but you should be able to read the shade clearly and the lens must be undamaged. Check the shade is correct for your work, and ask the maker or your supplier if you want to know whether a lens meets current requirements.
Oxy-fuel flames can give off a strong yellow light. During gas welding or cutting where the torch produces a high yellow light, it is desirable to use a filter lens that absorbs the yellow (sodium) part of the spectrum.So a lens made for gas work may be tinted differently from one meant for arc work, even at a similar shade number. Check what the lens is intended for, use the shade the chart gives for your gas process and plate thickness, and follow the maker's instructions.
Replace it as soon as it is cracked, scratched, pitted or covered in spatter to the point that it affects your view. Makers' manuals generally describe the cover lens as a sacrificial layer that protects the filter behind it, so it is the part you will change most often.How quickly it wears depends on how much spatter and grinding dust your work produces. Keep spares to hand, and do not weld without the cover in place, because spatter can pit and crack the shaded filter, which is harder to replace.