©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
III
trodes. The cost of electrical
power is also a factor to a lesser degree. By far, the largest
factor is labor and overhead.
g) Welder
Appeal- Welder appeal is definitely important,
although this factor must not
be allowed to subordinate other more significant criteria.
3.4.1
Typical
Electrode Use
by Welding
Classification 3.4.1.1
The E6010
and E6011 classification
electrodes would most likely be used for welding
a mild steel joint in the vertical position with an open root. If there
are only AC power sources
available, the choice between these two must be the E6011 type. Many times
arc blow is encountered
when welding with direct current. The use of E6011 electrodes on alter-
nating current eliminates the arc blow.
3.4.1.2 The
E6012 classification electrodes
are largely used today in repair and welding of less
critical structures. Carbon steels with some rust present can be welded
with this type of electrode.
It can be used to bridge or weld across wide gaps. The use of this
electrode, however,
has diminished greatly in the past few years. Before the advent of the low
hydrogen electrodes
and other welding processes, the E6012 electrode made up 60% of the total
production of electrodes. Today,
it represents about 6% of the total production in the United
States. 3.4.1.3
The E6013
classification of covered mild steel electrodes was originally designed
to have low arc penetration and flat
smooth weld beads. These features allowed the electrode
to weld sheet metal. Today, many
6013 electrodes are used instead of 6012 electrodes because
of the smoother arc, less spatter and more uniform weld bead surface.
3.4.1.4 The
E7014 classification of covered
mild steel electrodes, as indicated earlier, have iron
powder added to the coating formulation of the E6013 electrodes. This addition
allows the electrode
to be welded at higher currents, resulting in higher deposition rates and deposi-
tion efficiencies. Applications
for the E7014 are similar to those of the E6013 electrodes.
3.4.1.5 The
E7016 covered mild steel electrodes
are, as indicated earlier, low hydrogen with
a basic slag system. This combination of attributes allows the electrode
to be used to weld
some of the higher carbon steels and some low alloy steels. This electrode
has dimin- ished
in usage because of its lower deposition rate and lower deposition efficiency
than the more
modern E7018 electrode. 3.4.1.6
The E7018
classification is the low hydrogen iron powder electrode. The appre-
ciable amount of iron powder in the
coating and the somewhat heavier amount of coating on the
core wire allow the electrodes to be used at higher currents than those used with
the
