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Lenses, filters, visors and fittings for one maker's welding helmets: what the types of part do and how to choose the right one.
Many automatic filters are marked with an optical class of four digits, for example 1/1/1/2, taken from the older EN 379 standard. Each digit is scored from 1 (best) to 3 and rates one aspect of clarity: distortion of the view, how uniform and free of impurities the lens is, how consistently dark it stays across its surface, and how the view holds up when you look at the arc from a sharp angle.The first three are generally seen as the most important because they affect everyday welding. EN 379 has since been withdrawn and replaced by the EN ISO 16321 series, so newer filters may be marked differently. When replacing a filter, check the class and markings on the old one and in the helmet manual rather than assuming all filters are equal.
Arc welding gives off intense light and radiation that can cause arc eye, an acute injury to the front of the eye. The HSE says welding eye protection, including filters, should conform to the relevant British and European standards, which cover impact resistance, auto-darkening filters and fixed filters.A lens that is not marked to the right standard, or is the wrong type for your helmet, may not protect you properly. Check the markings on the old part and in the manual, and ask our team if you are unsure. Never keep using a filter that is cracked, chipped or damaged.
The HSE advises keeping reusable PPE clean, storing it in a dry, clean place when not in use, using the correct replacement parts and following the manufacturer's replacement schedule. For a helmet that means checking the maker's manual for how often lenses and fittings should be changed, rather than guessing.It also helps to keep spare lenses in their wrapping until needed so they stay clean and unscratched, and to report any obvious defect rather than carrying on with a damaged part.
Not on that basis alone. The HSE advises wearing goggles when chipping slag or wire brushing welds, because those tasks throw particles at the eyes. A dark welding filter is designed for arc radiation and is not a substitute for suitable impact eye protection.Many helmets have a clear flip-up visor or a clear lens for related tasks. Whether it is suitable for grinding or chipping depends on its markings, the maker's instructions and your risk assessment. If in doubt, wear separate suitable eye protection.