joints are recommended. The project drawings shall
indicate each joint type (bolted and/or welded).
Welded connections between carbon steel rail and
rail fittings fabricated from carbon steel, if
desired, may be accomplished using either of the
methods identified in paragraph "Welded Crane Rail
Joints." The designer shall determine the welding
method(s) to be used and project drawings shall show
location of each welding method. Welded connections
between carbon steel rail and cast manganese steel
are not recommended. However, if the activity
requires a dissimilar metal welded connection such
as this, the cast manganese stub rail end section
should be prepared for welding in accordance with
Sketch NFGS-14606-1. The manual shielded arc
welding method in accordance with paragraph "Manual
Shielded-arc Welding Method" and electrodes in
accordance with paragraph "Electrodes" should be
used. Thermite method is not acceptable for welding
dissimilar metal.
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Provide AWS low-hydrogen, high-tensile E 14018 or E 14016 electrodes.
Utilize electrodes of the smallest practical diameter worked at the lowest
compatible current. Coating on low-hydrogen type electrodes shall be
thoroughly dry when the electrode is used. Use electrodes taken from
hermetically sealed packages within one hour of the time the package is
opened. Electrodes not used within this one hour period and electrodes
taken from nonhermetically sealed packages shall be dried for at least one
hour between 370 and 430 degrees C (700 and 800 degree F) 700 and 800
degrees F before use. Electrodes so dried may be stored at temperatures
between 110 and 200 degrees C (225 and 400 degrees F) 225 and 400 degrees F
until used, or if not stored and not used within one hour after this drying
is completed, shall be redried before use. [Do not use electrodes which
have been wet.] [Hard surfacing rod used on top 3 mm (1/8 inch) 1/8 inch of
railheads shall be alloy with the following composition:
a.
Carbon, percent 0.4 to 0.6
b.
Manganese, percent 4.0
c.
Chromium, percent 18.0 to 21.0
d.
Nickel, percent 9.0 to 10.5
e.
Molybdium, percent 1.2
f.
Iron, base
Heat railhead to a minimum temperature of 260 degrees C (500 degrees F) 500
degrees F for a distance of 200 mm (8 inches) 8 inches on each side of the
joint before welding overlay.]
2.2
CRANE TRACK FITTINGS
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NOTE: Two types of crane rail fittings are
available:
SECTION 14606N
Page 13
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