®COPYRIGHT
2000 THE ESAB GROUP, INC. LESSON
VI 6.5 INDIVIDUAL
FILLER METAL CHARACTERISTICS 6.5.1
ER70S-2
- This classification covers filler metals that contain
small amounts of titanium,
zirconium, and aluminum, in addition to the normal deoxidizing elements of manga-
nese and silicon. These wires
are commonly referred to as “triple deoxidized wires”. They will
produce sound welds in all types of
carbon or mild steels. They are especially suited for
welding carbon steels that are rusty
or have mill scale on the surface. Weld integrity will vary
with the amount of oxides on the surface
of the steel. They may be used with CO2,
argon-CO2, or
argon-O2 shielding gas mixtures. They
work well in the short-circuiting mode for out-of-position
welding. 6.5.2
ER-70S-3
- Filler metals of this classification contain a relatively
low percentage of deoxidizing
elements; however, they are one of the most widely used GMAW wires. They
produce welds of fair quality when
used to weld rimmed steels (steels with high oxygen con-
tent) using argon-O2
or argon-CO2 as
a shielding gas. The use of straight CO2
is not recom- mended
when welding rimmed steels. Sound welds may be made when welding semi-killed
(low oxygen) and killed (fully deoxidized)
steels using argon-O2, argon-CO2,
or straight CO2. 6.5.2.1
Wires of this classification may be
used for out-of-position welding in the short-circuiting
transfer mode using argon-CO2 or CO2
shielding gas. 6.5.2.2
When CO2
shielding gas is used, high welding currents should be avoided because
welds produced may not meet the minimum
tensile and yield strengths of this specification. 6.5.3
ER70S-4
- Containing slightly higher silicon and manganese contents
than the ER70S-3
type, these filler metals will produce weld metal of higher tensile strength.
Primarily used
for CO2 shielding
gas applications where a higher degree of deoxidization is necessary.
6.5.4
ER70S-5
- The filler metals in this classification contain aluminum
as well as silicon and
manganese as deoxidizers. The addition of aluminum allows these wires to
be used at higher
welding currents with CO2
as the shielding gas. Not used for out-of-position
short-circuiting type transfer because
of high puddle fluidity. Can be used for welding rusty or
dirty steels with a slight loss of
weld quality. 6.5.5
ER70S-6
- Wires in this classification contain the highest combination
of deoxidiz- ers
in the form of silicon and manganese. This allows them to be used for welding
all types of carbon
steel, even rimmed steels, using CO2
as a shielding gas. They produce smooth, well
shaped beads, and are particularly
well suited for welding sheet metal. This filler metal is also
useable for out-of-position welding
with short-circuiting transfer. Moderately rusted or scaled
