SMAW Electrode

Electrodes
• The core electrode function: as a conductor of electrical current from the pole to the arc electrode which is formed after contact with the workpiece; as an added ingredient.
• coating the electrode function: to provide a protective gas in the weld metal, protecting air contamination at the time of metal in the liquid state; form a slag layer that coats the welding results from air oxidation during the cooling process; prevent the cooling process that is not too fast; ease of ignition; control arc stability.
• Moisture causes: coating peeled off easily so it is difficult to ignite; excessive splashing; arc unstable; excessive smoke.

• AWS (American Welding Society), the code electrode with E
E X X X X
 E = electrode
 Two or three digit one: indicates the value of tensile strength (tensile strength) x 1000 psi minimum welding permitted on the results.
 third or fourth digit: indicates the welding position.
1 = for all positions
2 = position under the hand and leveled to the connection point / fillet
3 = just below the position of the hand
4 = for all positions except the direction of fall
 The last digit: type of flow and type of coating
This type of flow  0 and 5: for current DCRP
2 and 7: for AC current or DCSP
3 and 4: for AC or DC current (DCRP and DCSP)
1, 6 and 8: for current AC or DCRP
Type of coating (flux)  0 and 1: celluloce (for penetration of the root / root)
2, 3 and 4: rutile
5, 6 and 8: basic / base
7: iron oxide

Table Diameter Electrodes with Large Flows