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OPERATION
Shielded metal arc
welding
Gas metal arc
welding and flux
cored arc welding
Gas tungsten arc
welding
Air carbon
Arc cutting
Plasma arc welding
Plasma arc cutting
Torch brazing
Torch soldering
Carbon arc welding
Gas welding
Light
Medium
Heavy
Oxygen cutting
Light
Medium
Heavy
(1)
As a rule of thumb, start with a shade that is too dark, 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 the visible light of the (spectrum) operation
(2)
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
workpiece.
Data from ANSI Z49.1-2005
GUIDE FOR SHADE NUMBERS
ELECTRODE SIZE
ARC
1/32 in. (mm)
CURRENT (A)
Less than 3 (2.5)
Less than 60
3-5 (2.5–4)
60-160
5-8 (4–6.4)
160-250
More than 8 (6.4)
250-550
Less than 60
60-160
160-250
250-500
Less than 50
50-150
150-500
(Light)
Less than 500
(Heavy)
500-1000
Less than 20
20-100
100-400
400-800
(2)
(Light )
Less than 300
(2)
(Medium)
300-400
(2)
(Heavy)
400-800
–
–
–
PLATE THICKNESS
in.
Under 1/8
Under 3.2
1/8 to 1/2
3.2 to 12.7
Over 1/2
Over 12.7
Under 1
Under 25
1 to 6
25 to 150
Over 6
Over 150
.
MINIMUM
PROTECTIVE
SHADE
7
8
10
11
7
10
10
10
8
8
10
10
11
6
8
10
11
8
9
10
–
–
–
mm
SUGGESTED ( 1 )
SHADE NO.
(COMFORT)
–
10
12
14
–
11
12
14
10
12
14
12
14
6 to 8
10
12
14
9
12
14
3 or 4
2
14
4 or 5
5 or 6
6 or 8
3 or 4
4 or 5
5 or 6
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