Lincoln Viking 3350 Helmet Parts FAQs
Practical answers on choosing and fitting spare lenses, headgear, sweatbands, batteries and magnifiers for an auto-darkening welding helmet.
How do I check the auto-darkening filter before I weld?
Welding-equipment makers' manuals describe a quick test before use. Point the front of the filter at a bright light source, then use your fingers to rapidly cover and uncover the sensors. The filter should darken as the sensors are exposed. Some manuals also allow a torch striker.
If the filter does not darken when an arc is struck, or the filter is cracked, stop using the helmet: the UV and IR protection may be compromised, which can burn the eyes and skin. Keep the sensors clean and unblocked, and inspect the helmet and cover lenses before each use.
What are the inner and outer cover lenses for, and when do I replace them?
The outer cover lens sits at the front and takes spatter and scratches so the auto-darkening filter behind it does not. The inner lens sits between the filter and your face. Neither is a substitute for the filter.
Maker manuals say to replace a cover lens if it is damaged, cracked, scratched, pitted, or spattered or dirty enough to impair vision. This is a condition-based decision, and no fixed interval is given. Do not use the helmet without the cover lenses properly fitted, and check your manual for how to remove and refit them.
Can I fit a cover lens that is the wrong size or from another source?
It is better not to. Maker manuals say to use only the replacement parts specified for the helmet, and one warns that cover lenses from other suppliers should be avoided because the lenses supplied are sized to work with that helmet. Using non-specified parts can also affect the warranty.
Choose lenses listed for your helmet and compare against the old one before fitting. The lens should be clean, secure and seated properly. If anything feels loose, do not weld until it is corrected.
How do I replace the coin cell battery, and which one do I need?
Many helmets use a lithium coin cell, but the type and the number of cells differ between models, so check the manual or the old cell. Some manuals say to slide open the battery cover when the low-battery light comes on, then fit the new cell the right way up. Others use a cover plate or need the filter opened, so follow your manual and never force it.
If the manual does not describe user battery replacement, do not open the filter cartridge. Test that the lens darkens before welding, and keep spare cells away from children.