ESAB F20 90 x 110 Parts FAQs
Filter lenses, cover lenses, visor, headgear, sweatbands and seals for a flip-up welding helmet with a large lens window, and how to match each part to your helmet.
How do I work out which filter lens size my helmet takes?
Start with the helmet's manual or parts list. A maker's parts list for this type of flip-front helmet shows the filter lens, cover lenses, flip visor and lens buckle separately for each lens window size, so you need to know which size you have. If you have no paperwork, measure the width and height of the old filter lens or window with a rule and compare both with the size shown for the new part.
A lens that is only close can sit loose and leave gaps, so do not force or pack one into a frame it does not match. The same manual warns against using parts other than those it specifies. Our team can help you check a part against the markings on the old one before you order.
What is the difference between the filter lens, the inside cover lens and the outer cover lens?
The filter lens is the dark glass that cuts down the arc's harmful ultraviolet and infrared radiation and its visible glare, according to its shade number. On a helmet of this type it sits between two clear cover lenses: an outer one that takes spatter and scratches, and an inner one behind the glass. A maker's manual says to refit them in the same order, so the glass stays between the outer and inner covers.
The same manual calls the cover lenses consumables to be replaced regularly. The filter lens is a protective part in its own right, so never weld with it missing, cracked or chipped.
How do I choose the shade of a fixed filter lens?
A fixed filter has one shade number, so it has to suit the process and the welding current you actually use. A higher number is darker. A maker's manual for this type of helmet gives a chart by process and amperage, and says that depending on the conditions the next higher or lower shade can be used. The damaging radiation is invisible, so the correct scale of filter must be chosen. The EN ISO 16321 series is replacing the older standards for new certification. Published charts differ a little, so use the one in your manual or procedure.
If the arc is uncomfortable to look at, or you cannot see the weld pool at all, stop and check the shade against the guide. Your risk assessment has the final say.
My filter lens is cracked or chipped. Can I keep welding with it?
No. A maker's manual says scratched or damaged lenses must always be replaced, and that damaged surfaces reduce your vision and impair protection. A cracked or chipped filter may no longer protect your eyes as it should, so stop work and fit a replacement before you weld again. Do not try to repair it with tape or glue.
When you order a new one, match the lens window size and the shade number, and check the markings on the lens are legible. Fit it between the cover lenses, which protect it, and make sure it sits flat in its frame with no gaps around the edge.