1. Objective 27.01
Explain basic arc welding procedures

2. Basic Arc Welding Procedures
Metal should be cleaned before it is welded
A grinder is the fastest way
A wire brush or other methods may be used to remove paint, rust, dirt, oil, etc.
Metal more than ¼” thick should be beveled at a 30 degree angle and placed 1/16” to 1/8” apart before two pieces are welded together

3. Types of Weld Joints
Butt: two pieces of metal lying in the same place such as end-to-end or edge-to-edge in flat position
T or “T”: two pieces of metal placed together to form a T, two pieces at a 90 angle to each other
Fillet weld: used to fuse the two pieces permanently

4. Types of Weld Joints Lap: two pieces of metal overlap each other
Corner: two pieces of metal make a 90 degree corner
Edge: two pieces placed parallel to one another or stacked on top of each other

5. Welding position
Welding position, metal thickness, and electrode size are used to determine amperage setting
Amperage too low causes a narrow, high bead with poor penetration
Amperage too high caused a flat bead with excessive spatter
Correct amperage helps make a uniform bead with bead width and penetration depth equal to each other.