Chart for Lens Tint for Protection against Radiant Energy

Operation

Electrode Size in Arc Current 1/32″ (0.8mm)

Arc Current

Minimum * Protective Shade

Shielded metal

arc welding

< 3

3-5

5-8

> 8

< 60

60-160

160-250

250-550

7

8

10

11

Gas Metal arc Welding and Flux cored arc welding

 

< 60

60-160

160-250

250-500

7

10

10

10

Gas Tungsten arc welding

 

< 50

50-150

150-500

8

8

10

Air Carbon

Light

< 500

10

Arc Cutting

Heavy

500 – 1,000

11

Plasma Arc Welding

 

< 20

20-100

100-400

400-800

6

8

10

11

Plasma Arc Cutting

Light **

Medium **

Heavy **

< 300

300-400

400-800

8

9

10

Torch Brazing

   

3

Torch Soldering

   

2

Carbon Arc Welding

   

14

 

Operations

Plate Thickness

Minimum * Protective Shade

Light Gas Welding

< 1/8 ” (3.2mm)

4

Medium Gas Welding

1/8″- ½” (3.2-12.7mm)

5

Heavy Gas Welding

> ½” (12.7mm)

6

Light Oxygen Cutting

< 1 (25mm)

3

Medium Oxygen Cutting

1-6″ (25-150mm)

4

Heavy Oxygen Cutting

> 6″ (150mm)

5

* As a rule of thumb, start with a shade that is too dark to see the weld zone. Then go to a lighter shade which gives sufficient view of the weld zone without going below the minimum. In oxyfuel gas welding or cutting where the torch produces a high yellow light, it is desirable to use a filter lens that absorbs the yellow or sodium line in the visible 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.

 

Source: 29 CFR 1910.133(a)(5). (www.OSHA.gov)

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