© 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. 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. 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. 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

Lesson 1
The Basics of Arc Welding
Lesson 2
Common Electric
Arc Welding Processes
Lesson 3
Covered Electrodes for Welding
Mild Steels
Lesson 4
Covered Electrodes for Welding Low Alloy Steels
Lesson 5
Welding Filler Metals for Stainless Steels
Lesson 6
Carbon & Low Alloy
Steel Filler Metals -
Lesson 7
Flux Cored Arc Electrodes Carbon Low Alloy Steels
Lesson 8
Hardsurfacing Electrodes
Lesson 9
Estimating & Comparing Weld Metal Costs
Lesson 10
Reliability of Welding Filler Metals
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