1. Shielded Metal Arc Welding
SMAW
Shielded Metal Arc Welding

2. Technical Terms AC Chipping Hammer CC CV DC DCEN DCEP DCRP DCSP
Electrode holder
SMAW

3. SMAW
Is a welding process in which the base metals are heated to fusion or melting temperature by an electric arc.
Arc is created between a covered metal electrode and the base metals
Base metals, arc, electrode, and weld are shielded from the atmosphere while welding.
Shielding Gas: used to protect the weld area from the atmosphere. Not pressurized.
As flux melts, creates the shielding gas.

4. SMAW

5. DC vs. AC DC Flows in one direction
DCEP creates deeper penetration then DCEN
DCEN caused electrode to melt faster and deposit filler metal at a faster rate.
DCEN heats the base more slowly then DCEP
More versatile because polarity can be changed AC
60 cycles per second
Cycle= repeating events
One direction 1/120 of a sec then reverses for 1/120 of a sec
Medium depth of penetration.
Meet most welding requirements, easy to use, cost less, used in industry, farm, and in home shop

6. SMAW Machines
Produce either CC or CV
SMAW require a CC

7. Chipping Hammer/ Wire Brush
Slag must be removed after each arc weld bead or pass is completed.
Slag is the hard, brittle material that covers a finished SMAW.
Use a Chipping hammer to chip slag away. Then further clean with a wire brush.

8. Electrode Identification
First two (sometimes three) numbers from the left = minimum tensile strength.
Last numeral = polarity
Second number from the right = recommended welding position/ type of weld.
1- all positions.
2- flat welding and horizontal fillet welds
3- flat position only
4- flat, horizontal, overhead, or vertical down welding