Page 170 - ProStar Product Guide

SAFETY PRODUCTS

ProStar Replacement Lenses
™

Safety, Cover, and
Filter Lenses for Every

Welding Process
Praxair offers a full line of ProStar
safety, cover and filter lenses for the
welding, cutting and metal working
industries. All ProStar polycarbonate
safety lenses and shaded filter lenses
meet or exceed the optical and
impact requirements of 2010 ANSI
Arc Welding Lens Selector Z87.1 and CSA.

Electrode Size Arc Current Minimum Protective Suggested Shade
Electric Process
[1]
in (mm) (Amps) Shade Number (comfort)
Shielded Metal Arc Welding Less than 3/32 (2.4) Less than 60 7 not recommended
(SMAW/Stick) 3/32 – 5/32 (2.4 – 3.9) 60 – 160 8 10
5/32–1/4 (3.9 – 6.4) 160 – 250 10 12
More than 1/4 (6.4) 250 – 550 11 14
Gas Metal Arc Welding 0.023 (0.58) Less than 60 7 not recommended
(GMAW/MIG) 0.023 – 0.035 (0.58 – 0.89) 60 – 160 10 11
Flux Cored Arc Welding 0.035 – 0.045 (0.89 – 1.1) 160 – 250 10 12
(FCAW/MIG) 0.045 – 0.062 (1.1 – 1.6) 250 – 500 10 14
Metal Cored Arc Welding
Gas Tungsten 0.020 – 0.040 (0.51 – 1.0) Less than 50 8 10
Arc Welding 1/16 – 3/32 (1.6 – 2.4) 50 – 150 8 12
(GTAW/TIG) 3/32 – 5/32 (2.4 – 3.9) 150 – 500 10 14
Plasma Arc Cutting (PAC) Less than 20 6 6 – 8
Light 20 – 100 8 9
[2]
Medium 100 – 400 9 12
Heavy 400 – 800 10 14
Air Carbon Arc Gouging 5/32 – 5/16 (3.9 – 7.9) Less than 500 10 12
5/16 – 3/4 (7.9 – 19.0) 500 – 1000 11 14

Shade numbers may be varied to suit individual needs.

Brazing & Soldering Lens Selector
1 Shade numbers are given as a rule of thumb. It is
[1]
Base Metal Thickness Suggested Shade Number
Electric Process recommended to begin with a shade that is too dark
in (mm) (comfort)
to see the weld zone. Then go to the next lighter
Gas Welding shade which gives sufficient view of the weld zone
Light Less than 1/8 (3.2) 4 or 5 without going below the minimum. In gas welding
Medium 1/8-1/2 (3.2 – 13) 5 or 6 or oxygen cutting, where the torch produces a high
Heavy More than 1/2 (13) 6 to 8 yellow light, it is desirable to use a filter lens that
absorbs the yellow or sodium line in the visible light of
Oxy Acetylene Cutting operation (spectrum).
Light Less than 1 (25) 3 or 4 2 These values apply where the actual arc is clearly
Medium 1 – 6 (25 – 150) 4 or 5 seen. Experience has shown that light filters may be
Heavy More than 6 (150) 5 or 6 used when the arc is hidden by the workpiece.
Shade numbers may be varied to suit individual needs.

E8 1-800 225 8247 www.praxairwelding.com