Safe Welding
 
 

Safe Welding Filters

Welding Filter Glass Construction.

Welding Filter Glass Composite

All welding filters installed in our range of helmets are constructed in accordance with EN379, and feature permanent UV protection up to DIN16 shade. The harmful UV wavelengths are removed by use of permanent glass filters [1], and a double LCD shutter system [2] controls the brightness, according to your selected shade setting. This construction offers an optimization of performance, and fail safe operation.

Welding Hazards : Light Sources UV/Visible/IR

The visible spectrum of light can be broken down into definite colour bands, each of which has a wavelength or frequency, measured in nanometers ( 0.000000001mtr), and this frequency is to be found between the values 400 to 700 nm

< 400

400-450

450- 500

500-570

570-590

590-610

610-700

>700
Ultra Violet

Violet

Blue

Green

Yellow

Orange

Red

Infra Red

 Welding processes generate radiation hazards for the operator at both ends of the visible spectrum, and it is the function of the welding helmet filter to reduce these harmful UV & IR radiations

UV - ultra violet radiation, whose wave form is to be found below 400nm is the main culprit for the condition generally referred to as "arc eye", and although this condition is fortunately in most cases only a temporary result of excessive UV exposure, it can cause sharp "sand in the eye" pain for 12 to 24 hours thereafter.

IR - Infra Red radiation is perceptible normally as heat, however, this is normally a local source to the arc, and can generally be contained or tolerated in most welding styles.

MMA (arc) Current Amps <40 41 - 80 81 - 175 176 - 300 301 - 500
Min Shade 9 10 11 12 13

MIG Current Amps <100 101-175 176-300 301-500 > 500
Min Shade 10 11 12 13 14

TIG Current Amps <20 21 - 40 41 - 100 101 - 175 176 - 250
Min Shade 9 10 11 12 13

These recommendations are minimum shade scales, as defined in BS EN 169 BS EN 379, however, the operator may for personal preference reasons prefer to weld on a lighter or darker setting

 

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