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4 1/4" x 3 1/4" Shade 9 Lens
Practical answers on choosing, fitting and looking after the taller-format shaded, cover and backing lenses used in many fixed-shade helmets.
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.
Not automatically. The shade should be chosen for the process and the cutting current, and plasma cutting is listed separately from arc welding in shade tables. Published plasma cutting values apply where the arc is clearly seen, and lighter filters may be used when the arc is hidden by the workpiece.Because the figures differ between sources, use the shade guidance in the plasma equipment's instructions as your starting point. Do not drop below the minimum for your current, and check with the helmet and lens maker.
Remove the old lens and measure its overall width and height, or read the size from the helmet manual or old lens packaging. Sizes are given in inches as well as millimetres, so a figure may differ slightly between listings of the same format.Also compare thickness and corner shape, and make sure the lens sits flat with the clip or gasket holding it. Cover, filter and backing lenses of the same size are different parts, so check you order the layer you need. If unsure, use the helmet's parts list.