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 PROCEDURES:
TYPE: CAST IRON - ARC
Bevel cracks using gouging rod (NSN 9GD
(machinable nickel-iron base)
3439-00-453-5950), Keep uniform heat through
welded section. On casting of dissimilar thickness,
NSN: 9GD 3439-00-165-4189 (1/8X 14)
maintain interpass temperature of 5000 F. Peen
9GD 3439-00-165-4188 (5/32X 14)
lightly to relieve stress. Cool casting slowly.
POSITION: All
CHARACTERISTICS:
If one section of the casting can move freely during
POLARITY: AC or DC Reverse
welding, the welding can be continuous so the
welding job can be finished quickly. The weld
RECOMMENDED AMPERAGES:
deposit is not hot short like NSN 9GD
1/8 - 80 to 120
5/32 -90 to 140
Tensile Strength: 55,000-60,000 psig
USES:
Primary: For welding of gray and alloyed cast iron.
The deposits give greatest crack resistance and should
be used where weld is subject to air, gas, or liquid
pressure. Use to repair pump housings, valves,
pressure chambers, cast, and malleable fittings.
Excellent for crack-sensitive jobs such as joints under
restraint, dissimilar thicknesses, and the welding of
heavy sections. Can be used to join cast iron to steel.
Secondary: Buildup for hardfacing on cast iron.
1-14
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