LESSON VII
©
COPYRIGHT 2000 THE ESAB GROUP, INC. 7.6 AWS
SPECIFICATION A5.20-95 This
American Welding Society (AWS) Specification is entitled Specification
For Carbon
Steel
Electrodes For
Flux Cored
Arc Welding.
It prescribes the requirements for classifying flux
cored electrodes for welding carbon steels or low alloy steels.
7.6.0.1 The
following requirements will be covered in this text: 1.
Whether gas shielded or self-shielded 2.
Single pass or multiple pass 3.
Type of welding current 4.
Welding position 5.
As-welded mechanical properties of the weld metal 6.
Chemical composition of the weld metal 7.6.0.2
The letter-number designations in this
specification are shown in Figure 7. 7.6.0.3
As an example, the designation E71T-1
indicates an electrode (E) that will pro- duce
weld metal of a minimum 72,000 psi ultimate tensile strength (7), may be used
for welding in
all positions (1), is a flux cored electrode (T), is a multipass gas shielded
type for operation
on direct current, reverse polarity (electrode positive), and must have a minimum
Charpy V-notch value of 20 ft.-lbs
at 0°F (Figure 9). 7.6.1
Tensile
Strength and
Elongation -
The specification has only two tensile strength
classifications. They are shown in Figure 8. Electrode
Min. Tensile Strength X 10,000 psi
0: Flat and Horizontal
1: All Position
T
- X Usability,
Performance & Impacts Tubular
or Flux Cored CARBON
STEEL FLUX CORED ELECTRODE DESIGNATIONS FIGURE
7
EX X
