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4 1/4" x 3 1/4" Back Lens BS679
Practical answers on choosing, fitting and looking after the taller-format shaded, cover and backing lenses used in many fixed-shade helmets.
No. The shade you need is decided by the process and the welding current, not by the size of the lens window. Published shade charts list shade by process, current and, for gas work, plate thickness.A taller lens simply gives you a larger view of the work. Use a recognised shade chart for your process, start with a shade that is dark enough, and step lighter only within the recommended range. Check the helmet maker's instructions and your risk assessment.
Yes. Arc radiation can reach anyone nearby. People near an arc should not be exposed without adequate protection, using screens or personal eye protection, and helpers working near an arc need anti-flash glasses. Shade requirements also apply to observers such as a fire watch or an assistant.A helmet lens protects only the person wearing it. Use screens, or give helpers suitable eye protection, and cover this in your risk assessment.
Arc eye is an inflammation of the cornea caused by ultraviolet radiation from the arc. It is an acute injury to the front of the eye. Symptoms usually appear several hours later: red, watery, painful, gritty eyes that are sensitive to light.The effects are usually temporary and clear up within a day or so, but get medical advice if you are worried or symptoms are severe. Prevent it by using the right shade, keeping the lens undamaged and light-tight, and screening other people.
Usually yes. The helmet lens protects against arc radiation, but flying slag, grinding fragments and chips can still reach your eyes, for example when you lift the helmet. Where such hazards exist, people using a welding helmet with filter lenses would also need glasses with side shields or goggles.Eye injuries commonly come from slag, grinding and chipping. Choose impact-resistant eyewear with side protection and follow the helmet maker's instructions and your risk assessment.