©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
III 3.7.10
ATOM
ARC 7018
(AWS E7018)
- This electrode was the original iron powder low
hydrogen electrode in the United States
and continues to be the standard of comparison against
all others. Outstanding economy and mechanical properties are achieved when
Atom Arc 7018
electrodes are used to weld carbon steels, high sulfur steels, enameling steels,
and low alloy
high tensile steels in all thicknesses. In addition, Atom Arc 7018 electrodes
today are manufactured
with a moisture resistant coating. Preheat levels may be reduced when welding
many hardenable steels with Atom Arc
7018 electrodes. Applications
for Atom Arc 7018 electrodes include practically every structure that is welded
today. It has been especially
useful in welding large oil storage tanks, nuclear plant parts, and
in many critical weldments that require
the highest possible quality and reliability. Typical
mechanical properties of Atom Arc 7018 weld metal are: Yield
Point - 68,000 psi Tensile
Strength - 78,000 psi Elongation
(2" Gauge) - 30% Reduction
of Area - 75.5% Charpy
V-Notch Impact Resistance - 125
ft-lbs @ 72°F 70
ft-lbs @ -20°F The
typical chemical composition of Atom Arc 7018 weld metal is:
Carbon 0.045%
Phosphorus 0.015%
Manganese 1.10%
Sulfur 0.014%
Silicon 0.4%
DEPOSITION
RATE DATA:
Atom Arc 7018*
Electrode Deposition
Diameter
Amperage
Efficiency,
% (Lbs/Hr.)
1/8" 120
71.6 2.58
140 70.9
2.74 160
68.1 2.99
5/32" 140
75.0 3.11
170 73.5
3.78 200
73.0 4.31
