ESAB G40 Air 90 x 110 Parts FAQs
Spare lenses, gaskets, headgear, sweatbands and shell parts for an air-fed welding helmet, and how to choose and look after them.
When should I replace the outer lens on an air-fed welding helmet?
The outer (cover) lens takes the spatter and sparks so the filter behind it does not. Replace it when it is pitted, scratched or too dirty to clean, because a damaged cover makes the weld harder to see and should not be left in place.
How often depends on the work. Heavy spatter processes or grinding may need a change much sooner than light work, and there is no single fixed interval. Check it before every shift. Covers are usually specific to the helmet, so match the size and shape shown in your manual or on the old part before ordering a pack.
What is the difference between the outer lens and the filter lens?
The filter lens is the dark glass that cuts the arc's light and ultraviolet and infrared radiation to a safe level. The outer lens is a clear, easily replaced sheet in front of it that protects it from spatter, pitting and scratching.
The outer lens is meant to be changed often so the filter lasts. Some helmets also have a clear inner retaining lens behind the filter. A cover is not a substitute for a filter, and a filter must never be left out. Check your manual for which lenses your helmet uses and in what order they fit.
How do I check that a replacement filter lens will fit my helmet?
Filter lenses are made in set sizes, written as width x height in millimetres, so the replacement must match the size your helmet's holder was made for. Check the thickness and shade as well as the nominal size.
Read the markings on the old lens and on the helmet. Helmet frames used to be covered by an older European standard, which has been replaced by a newer international standard series for new certification, so older helmets may still show the old marking. Lens markings show details such as the shade and manufacturer. If markings are worn off, use the helmet manual or measure the old lens, and ask our team if you are unsure.
What are the lens gasket and lens cradle for?
The lens cradle is the frame or holder that the filter lens sits in inside the helmet front. The gasket is a thin seal that usually sits between the glass and its holder so the lens is held without rattling and without being stressed.
If the helmet uses a gasket, it should be replaced periodically, and whenever it is flattened, torn or missing. Check that the lens sits flat and secure, with no gaps that could let stray light reach your eyes. Do not use a cradle that is cracked or deformed. Which parts your helmet has, and how they fit together, is shown in the manual's parts diagram.