glasses should be provided to protect each helmet,
1. Helmets and hand shields should be made of
hand shield, or goggle lens.
a material that is an insulator for heat and
electricity. Helmets, shields, and goggles must be
11. Table 7-1 is a guide for the selection of the
fire retardant and must be capable of withstanding
proper shade number. These recommendations may
sterilization.
be varied to suit the individual's needs. The shade
numbers in the following list will help you select the
2. Helmets and hand shields of federal
proper lens to use.
specification GGG-H-21 1 should be arranged to
accommodate and securely hold window lenses
a. Shade No. 4, in any type goggle, may be
having the specified dimensions, with cover glass,
used for stray light from nearby cutting and welding
and designed to permit easy removal of lenses.
operations and for light electric spot welding.
Absorptive lenses must be mounted in helmets so
they are not less than 2 inches from the eyes.
b. Shade No. 5 filter lenses are usually
sufficient for light gas cutting and welding.
3. Goggles designated as style 1 have a rigid
nonadjustable bridge (or adjustable metallic bridge)
c. Shade No. 6 filter lenses are usually
without side shields.
sufficient for gas cutting, medium gas welding, and
arc welding up to 30 amperes.
4. Goggles designated as style 2 have a rigid
nonadjustable bridge (or adjustable metallic bridge)
with side shields.
d. Shade No. 8 filter lenses are usually
sufficient for heavy gas welding and for arc welding
5. Goggles designated as style 3 have flexibly
and cutting exceeding 30 but not exceeding 75
connected lens containers shaped to conform to the
amperes.
configuration of the face.
e. Shade No. 10 filter lenses should be used
6. Lens containers must be suitable to firmly
for arc cutting and welding exceeding 75 but not
hold lenses of the correct dimensions.
exceeding 200 amperes.
7. Goggles of style 2 should be provided with
f. Shade No. 12 filter lenses should be used
side shields of metal, leather, or other durable
for arc cutting and welding exceeding 200 but not
asbestos-free material. The material should also be
exceeding 400 amperes.
pliable to permit adjusting the shield to the contour
of the face. If side shields are of metal, they should
g. Shade No. 14 filter lenses should be used
be of wire mesh or of perforated sheet having
for arc cutting and welding exceeding 400 amperes.
openings not larger than 0.394 inch.
A variety of special clothing is available to
protect the body during cutting and welding
8. Goggles of style 3 should consist of eyecups
operations. The protective clothing to be worn will
and should be shaped to fit the configuration of the
face. They must have adequate ventilation to
vary with the size, location, and nature of the work
to be performed. During ANY welding or cutting
prevent fogging.
operation, you should wear flameproof gauntlets at
9. Lenses for helmet and hand shield windows
all times. For gas welding and cutting, a five-finger
should have a height of 2 inches (50.8 mm) and a
glove is generally used. For electric-arc welding, a
width of 4.25 inches (108 mm) where one window is
gauntlet-type mitt is recommended. Gauntlets
provided.
protect the hands from both heat and metal spatter.
The one-finger mitt designed for electric-arcwelding
10. Lenses for goggles should have dimensions
has an advantage over the glove because it reduces
not less than 1.5 inches (38 mm) in the vertical
the danger of weld spatter and sparks lodging
direction and 1.75 inches (44.5 mm) in the
between the fingers. It also reduces the chafing of
horizontal direction. It is recommended that
fingers, which sometimes occurs when five-finger
gloves are used for electric-arc welding.
circular lenses not involving optical correction be a
uniform diameter of 1.97 inches (50 mm). Cover
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