©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
III
h) E7018
electrodes are the more modern version of the low hydrogen
electrode. The
addition of considerable amounts of iron powder to the covering results in
a smoother arc with less spatter. This
modern balance of covering ingredients results
in a great improvement in arc stability, arc direction and ease of han-
dling in all welding positions.
i) E6020
electrodes have a coating that consists mainly of iron
oxide, manga- nese
compounds and silica. They have a spray-type arc and produce a heavy
slag that provides protection of the
molten weld metal. The molten weld metal is
very fluid, limiting the use to flat or horizontal fillet welds.
j) E6022
electrodes are for high speed, high current single pass
welding of sheet
metal. They are not generally available today. k)
E7024 electrodes
have a coating similar to the E6012 and E6013 types, but
have a very heavy coating that contains
50% iron powder by weight. Run at relatively
higher currents, the deposition rate is high. Welds are limited to the
flat and horizontal fillet positions.
Penetration is relatively low. AC or DC, either
polarity may be used. m)
E6027 electrodes
are also a high iron powder type, the coating consisting of
50% iron powder by weight. Current
may be AC or DC, either polarity. The penetration
is medium and the weld beads are slightly concave with good side
wall fusion. As with all high
iron powder electrodes, deposition rate is high. n)
E7028 electrodes
are much like the E7018 electrodes except that the coating
is heavier and contains 50% iron powder
by weight. Unlike the E7018 elec- trode,
they are suitable for flat and horizontal fillet welding only. Deposition
rate is very high.
o) E7048
electrodes are much like the E7018 electrodes except
they are de- signed
for exceptionally good vertical-down welding.
