LESSON VII ©
COPYRIGHT 2000 THE ESAB GROUP, INC. 7.6.2
Usability
and Performance
- The number of passes, shielding gas require-
ments, type of welding current and
the impact requirements, are all specified by the last digit
or letter in the electrode designation. The significance of the last digit
or letter is shown
in Figure 9. TENSILE
YIELD*
ELONGATION* AWS
STRENGTH STRENGTH
PERCENT IN CLASSIFICATION
psi. psi.
2 INCHES E6XT-X
62,000 50,000
22 E7XT-X
72,000 60,000
22 *
E6XT-GS, E7XT-2, E7XT-3, E7XT-10 and E7XT-GS have no yield strength or elongation
requirements. WELD
METAL MECHANICAL PROPERTIES OF CARBON STEEL FLUX
CORED ELECTRODES FIGURE
8 7.6.3
Chemical
Composition Requirements
- The chemical requirements of the weld
metal are specified only for the multipass
electrodes, since the single pass types would show
high dilution from the base metal and would be meaningless. Weld metal chemical
composition requirements for the multipass
types are: AWS
Classification
Shielding
Gas Current
and Polarity V-notch
impact EXXT-1
Multiple Pass
CO2
DCEP 20
ft.-lbs. @0°F* EXXT-1M
Multiple Pass
75-80%Ar/bal CO2
DCEP 20
ft.-lbs. @0°F* EXXT-2
Single Pass CO2
DCEP Not
Specified EXXT-2M
Single Pass 75-80%Ar/bal
CO2 DCEP
Not Specified
EXXT-3 Single
Pass None
DCEP Not
Specified EXXT-4
Multiple Pass
None DCEP
Not Specified
EXXT-5 Multiple
Pass CO2
DCEP or DCEN
20 ft.-lbs. @-20°F*
EXXT-5M Multiple
Pass 75-80%Ar/bal
CO2 DCEP
or DCEN 20 ft.-lbs.
@-20°F* EXXT-6
Multiple Pass
None DCEP
20 ft.-lbs. @-20°F*
EXXT-7 Multiple
Pass None
DCEN Not
Specified EXXT-8
Multiple Pass
None DCEN
Not Specified
EXXT-9 Multiple
Pass CO2
DCEP 20
ft.-lbs. @-20°F* EXXT-9M
Multiple Pass
75-80%Ar/bal CO2
DCEP 20
ft.-lbs. @-20°F* EXXT-10
Single Pass None
DCEN Not
Specified EXXT-11
Multiple Pass
None DCEN
Not Specified
EXXT-12 Multiple
Pass CO2
DCEP 20
ft.-lbs. @-20°F* EXXT-12M
Multiple Pass
75-80%Ar/bal CO2
DCEP 20
ft.-lbs. @-20°F* EXXT-G
Multiple Pass
Not Specified
Not Specified
Not Specified
EXXT-GS Single
Pass Not Specified
Not Specified
Not Specified
* "J" Designation indicates V-notch
impact values of 20 ft.-lbs. @-40°F USABILITY,
PERFORMANCE AND IMPACT VALUES FLUX
CORED ELECTRODE DESIGNATIONS FIGURE
9
