3M Speedglas 9100 Air User Instructions page 10

Tack Mode
This setting may help reduce eye fatigue resulting from the eye frequently
adjusting to differing light levels during rapid tack welding. As the arc
extinguishes, the fi lter will recover to shade 5. If another arc is not struck
within 2 seconds the fi lter will return to the normal light state (shade 3).
Low Battery Indicator
The batteries should be replaced when the low battery indicator fl ashes or LEDs do not fl ash when the buttons
are pressed.
Table 2. Recommended Guide for Shade Numbers
(Adapted from ANSI Z49.1-2003)
Operation Electrode
diameter inches
Shielded metal arc < 3
3-5
5-8
> 8
Gas-metal-arc welding
Gas-tungsten-arc
Air-carbon-arc cutting
Plasma-arc welding
Plasma-arc cutting
Carbon arc welding
Arc current, Minimum Recommended
amps Protective Shade Shade Number
< 60 7
60-160 8
160-250 10
250-550 11
< 60 7
60-160 10
160-250 10
250-500 10
< 50 8
50-150 8
150-500 10
< 500 10
500-1000 11
< 20 6
20-100 8
100-400 10
400-800 11
< 300 8
300-400 9
400-800 10
15
---
10
12
14
---
11
12
14
10
12
14
12
14
6-8
10
12
14
9
12
14
14
delay
d 1 d 1
d 2 d 2
∑
Table 3
16