How To Select Filter Lenses Guide

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.