©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
IV 4.6.10
Atom
Arc 12018
(AWS E12018-M)
- This electrode deposits high strength weld metal
in both the as welded and stress-relieved conditions, which is required for welding
many of the high
strength quenched and tempered steels. It is used to weld steels with 120,000
psi tensile strength
in applications, such as welding carbon and high strength alloy steel forgings
for railroad equipment, high strength
steel castings for structural work, and steel castings for
highway bridges.
Typical
Mechanical Properties
of Weld
Metal Stress-Relieved
As
Welded 1
hr.
@1025°F.
Yield Point, psi
120,000 119,000
Tensile Strength, psi
132,000 129,000
% Elongation (2")
20 22
% Reduction of Area
56 60
Charpy V-Notch Impacts
@72°F. 52
ft.-lbs. 54 ft.-lbs.
@-60°F. 32
ft.-lbs. 31 ft.-lbs.
Typical
Chemical Composition
of Weld
Metal C
Mn Si
Cr Ni
Mo 0.05%
1.90% 0.25%
0.85% 2.00%
0.50% 4.6.11
Atom
Arc "T"
(AWS E11018-M)
- Atom Arc "T" electrodes were developed for welding
U.S. Steels T-1 steel, which is quenched and tempered to high strength and ductility.
It has since
been used to weld all of the quenched and tempered steels, including HY-80, the
steel used for the pressure hulls of
nuclear submarines. Typical
Mechanical Properties
of Weld
Metal Stress-Relieved
As
Welded 1
hr.
@1025°F.
Yield Point, psi
103,000 102,000
Tensile Strength, psi
115,000 116,000
% Elongation (2")
22 24
% Reduction of Area
62 63
Charpy V-Notch Impacts
@72°F. 80
ft.-lbs. 73 ft.-lbs.
@0°F. 55
ft.-lbs. 50 ft.-lbs.
@-40°F.
48 ft.-lbs. 42
ft.-lbs. @-60°F.
41 ft.-lbs. 26
ft.-lbs.
