LESSON VII ©
COPYRIGHT 2000 THE ESAB GROUP, INC. Maximum
Percent by
Weight (as
determined) E7XT-1;
E7XT-1M E7XT-4;
E7XT-6 E7XT-5;
E7XT-5M E7XT-7;
E7XT-8 Element
E7XT-9;
E7XT-9M
E7XT-11
E7XT-12;
E7XT-12M
Carbon 0.18
Reported 0.15
Manganese 1.75
1.75 1.60
Silicon 0.90
0.60 0.90
Sulfur 0.03
0.03 0.03
Phosphorus 0.03
0.03 0.03
Chromium 0.20*
0.20* 0.20*
Nickel 0.50*
0.50* 0.50*
Molybdenum 0.30*
0.30* 0.30*
Vanadium 0.08*
0.08* 0.08*
Aluminum --
1.8 --
Copper 0.35
0.35 0.35
* The amounts of these elements
shall be reported only if intentionally added. Single
pass types EXXT-2, EXXT-3, EXXT-10 and EXXT-GS have no chemical require-
ments. 7.7
INDIVIDUAL ELECTRODE CHARACTERISTICS The
electrodes in this specification may be grouped by their suffix i.e., T-1, T-2,
T-3, etc., as
having similar flux components that give them similar usability characteristics
and are briefly
described here. 7.7.1
EXXT-1
& EXXT-1M
- Electrodes of the T-1 classification are gas shielded
types, and
the properties required in this specification are listed using CO2
as the shielding gas. Argon-CO2
gas mixtures may be used for the electrodes specified for all-position
welding. These
are usually the smaller wires of .045", .052", and 1/16" diameter. Using
an Argon-CO2
gas mixture will diminish the amount of oxygen present and cause the weld
metal to have a higher manganese and
silicon content. This will increase the tensile strength
and may improve the impact properties. The manufacturer’s recommendation
for the type
of shielding gas should be followed. Those electrodes specified for flat
and hori- zontal
fillet welding usually use a CO2 gas shield
and will range from 1/16" to 1/8" in diameter.
