©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
V 5.22.4.2
The shielding gas should be 98% argon-2%
oxygen. Welding heavier sections or the
application of cast iron to carbon steel requires the use of 400-600°F preheat.
5.22.4.3 Nicore
55 is available in a variety of sizes from .035" - 3/32" diameters and many
standard packages ranging from 10 &
33 lb spools to 60 lb coils. 5.22.5
Cupro
Nickel Electrodes
(AWS A5.6,
Class ECuNi)
- This 70% copper, 30% nickel
electrode is designed to provide outstanding weld metal in welding 70-30 and 90-10
copper-nickel alloys with direct current
reverse polarity. The electrode can be used in all
welding positions. Slag removal
is easy and complete from the smooth weld beads. Weld
deposits are sound by X-ray and have
excellent strength and ductility. 5.22.5.1
The primary uses for copper-nickel
alloys are in the fabrication of ship condensers, distiller
tubes, heat exchangers, and other items exposed to sea water corrosion.
A. Typical
Mechanical Properties
of Weld
Metal: As
Welded Yield
Point (psi) 35,500
Tensile Strength (psi)52,000
% Elongation (2")
40 B.
Typical Chemical
Composition of
the Weld
Metal: Carbon
0.3% Manganese
1.3% Silicon
0.7% Iron
0.55% Copper
68.0% Nickel
30.0%
