Selection Guide:
Filter Lenses For Protection Against Radiant Energy
|
Operations |
Electrodes Size 1/32 Inches |
Arc Current |
Minimum Protective Shade |
|
Shielded metal arc welding |
less than 3
|
less than 60
|
7
|
|
3-5 |
60-160 |
8 |
|
|
5-8 |
60-250 |
10 |
|
|
more than 8 |
250-550 |
11 |
|
|
Gas metal arc welding Flux cored arc welding |
|
less than 60 |
7 |
|
60-160 |
10 |
||
|
60-250 |
10 |
||
|
250-500 |
10 |
||
|
Gas Tungsten arc welding |
|
less than 50 |
8 |
|
50-150 |
8 |
||
|
150-500 |
10 |
||
|
Air Carbon |
Light |
less than 500 |
10 |
|
Air cutting |
Heavy |
500-1000 |
11 |
|
Plasma arc welding |
|
less than 20 |
6 |
|
20-100 |
8 |
||
|
100-400 |
10 |
||
|
400-800 |
11 |
||
|
Plasma arc cutting |
light* |
less than 300 |
8 |
|
medium** |
300-400 |
9 |
|
|
heavy** |
400-800 |
10 |
|
|
Torch Brazing |
|
|
3 |
|
Torch soldering |
|
|
2 |
|
Carbon arc welding |
|
|
14 |
* As a rule of thumb start with a shade that is too dark to see the weld zone then switch a lighter shade which gives sufficient view of the weld zone without going below the minimum shade allowed. In oxyfuel gas welding or cutting where the torch produces a high yellow light, use a filter lens that absorbs the yellow (sodium line) in the visual light of the (spectrum) operation.
** These values apply where the actual arc is clearly seen. Experience has shown that lighter filters may be used when the arc is hidden by the work piece.
