Page 48 - Praxair Safety Products Guide

REPLACEMENT LENSES ProStar ®

Praxair offers a full line of
ProStar safety, cover and
filter lenses for the welding,
cutting and metal working
industries. Polycarbonate safety
lens and shaded filter lenses
meet or exceed the optical
and impact requirements of
2010 ANSI Z87.1 and CSA.
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Lens Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selectorns Shade Selector
Electric Process Electrode Size Arc Current Minimum Suggested Shade
in. (mm) (amps) Protective Shade Number (comfort)
1
Shielded Metal Arc Less than 3/32 (2.4) Less than 60 7 not recommended
Welding 3/32–5/32 (2.4–3.9) 60–160 8 10
(SMAW/Stick) 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
Gas Process
Shade numbers given as a guide only and may be varied to suit individual needs.
1 Shade numbers are given as a rule of
Electric Process Base Metal Thickness Suggested Shade thumb. It is recommended to begin with
1
in. (mm) Number (comfort) a shade that is too dark to see the weld
zone. Then go to the next lighter shade
Gas Welding which gives sufficient view of the weld
Light Less than 1/8 (3.2) 4 or 5 zone without going below the minimum.
Medium 1/8-1/2 (3.2–13) 5 or 6 In gas welding or oxygen cutting where
the torch produces a high yellow light,
Heavy More than 1/2 (13) 6 to 8 it is desirable to use a filter lens that
absorbs the yellow or sodium line in the
Oxy Acetylene Cutting visible light of operation (spectrum).
Light Less than 1 (25) 3 or 4 2 These values apply where the actual
Medium 1–6 (25–150) 4 or 5 arc is clearly seen. Experience has
Heavy More than 6 (150) 5 or 6 shown that light filters may be used when
the arc is hidden by the workpiece.
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