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Spare parts for an air-fed welding helmet used with a pressure flow supplied-air set: how to identify the right part, what wears and how to look after it.
In a supplied-air system, the control set and belt parts manage how the air from the supply reaches the hose and helmet. Parts in this group usually include the belt that carries the unit on the body, the control or regulating fittings, and small items that wear or get damaged in a workshop.The exact arrangement depends on the maker and the version, so check the parts list in the manual to see what a set contains and whether the belt can be replaced on its own. Never alter or adapt the air-supply parts in any way the manual does not describe.
The HSE says respiratory protective equipment must be thoroughly inspected before each use, and that records of regular examinations, maintenance and repairs should be kept for reusable equipment. In practice that means looking over the helmet, head cover, seals, hose, belt and connections for damage, wear, cracks or loose fittings, and checking the air flow in the way the maker's manual describes.If anything is damaged, or the flow check is not passed, do not weld in the helmet until the fault is put right. The user's risk assessment and the maker's instructions set how often more detailed examination is needed.
Yes. A lens has to match the opening in the helmet frame, so the width and height must be correct and the type of lens must suit the holder. Measure the old lens, or check the dimensions printed in the manual or on the lens edge, before buying a new one.A lens that is only roughly the right size can leave gaps, sit loosely or be held badly, which can let light and spatter reach the face. Also check the filter's marking for the shade and, for auto-darkening types, the optical class. Passive filters and auto-darkening filters are marked differently, so check you are buying the right type.
A welding filter carries a marking on the lens showing the shade or shade range, the maker's identification, an optical class and the standard it was made to. Older automatic filters carry four classes each graded 1 to 3, where 1 is the best: optical quality, light diffusion, variation in luminous transmittance and angle dependence. That older standard has been withdrawn and replaced by a newer international series, so newer filters may be marked differently.The marking on the filter itself is the authority. Compare it with the manual for the helmet and use only the types and shades the maker approves for that helmet.