©
COPYRIGHT 2000 THE ESAB GROUP, INC. LESSON
III 3.3 AWS
SPECIFICATION A5.1-91 This
American Welding Society (AWS) specification has been developed over the years
by a filler metals
committee, composed of members who represent electrode producers, such as
ESAB, users from the welding industry,
and independent members from colleges, universities and
independent laboratories. This balanced membership is required to prevent
prejudice from
entering into the specifications. 3.3.0.1
Individual Mild Steel electrodes are
classified by the manufacturer according to the above
specification on the basis of the mechanical properties (also called physical
properties) of
the weld metal, the type of covering, the welding position of the electrode, and
the type of current
(AC or DC). The classification system is designed to give certain information
about the electrode
and the weld metal produced from it. The significance of the AWS designations
are shown in tabular form in Figure
3. 3.3.0.2
These classifications, with the AWS
Specification A5.1-91, are assigned by the manufacturer
of the electrodes according to the results of his own tests. The American
Weld- ing Society
does not approve or disapprove electrodes. 3.3.0.3
The American Society of Mechanical
Engineers (ASME) uses the AWS Electrode Specifications
word for word by adding the letters SF before the specification number. Thus,
AWS Specification A5.1-91 becomes ASME
Specification SFA5.1. The classification and requirements
are the same. Class
Composition
Function Shielding
Cellulose (C6H10O5)
35% Gas
Former 40% H2
Rutile (TiO2)
15% Slag
Former - Arc Stabilizer 40%
CO + CO2 E6010
Ferromanganese
5% Deoxidizer
- Alloying 20%
H2O Talc
15% Slag
Former Sodium
Silicate 25%
Binder - Fluxing Agent
Moisture 5%
Calcium Carbonate
30% Gas
Former - Fluxing Agent Fluorspar
(CaF2) 20%
Slag Former - Fluxing Agent
Ferromanganese
5% Deoxidizer
- Alloying 80%
CO E7018
Potassium Silicate
15% Binder
- Arc Stabilizer 20%
CO2 Iron
Powder 30%
Deposition Stabilizer
Moisture 0.1%
COMPOSITION AND FUNCTION OF ELECTRODE
COATING CONSTITUENTS FIGURE
2
