Shielded Metal Arc Welding
1. Perform safety inspections of equipment and accessories.
2. Make minor external repairs to equipment and accessories.
3. Set up for shielded metal arc welding operations on plain carbon steel.
4. Operate shielded metal arc welding equipment.
5. Make fillet welds, all positions, on plain carbon steel.
6. Make groove welds, all positions, on plain carbon steel.
7. Perform 2G and 3G, uphill, limited thickness qualification tests on plain carbon steel plate.
2. Make minor external repairs to equipment and accessories.
3. Set up for shielded metal arc welding operations on plain carbon steel.
4. Operate shielded metal arc welding equipment.
5. Make fillet welds, all positions, on plain carbon steel.
6. Make groove welds, all positions, on plain carbon steel.
7. Perform 2G and 3G, uphill, limited thickness qualification tests on plain carbon steel plate.
Recommended Instructional Activities
ANSI Z49.1 Section 11
AWS Welding Handbook Volume One
Principles of Operation
Shielded Metal Arc Welding Chart 1
Chapter 3 Shielded Metal Arc Equipment, Setup, and Operation
Objectives:
- describe the process of shielded metal arc welding.
- list and define the three units used to measure a welding current.
- tell how adding chemicals to the coverings of the electrodes affects the arc.
- discuss the three different types of current used for welding.
- explain the types of welding power supplies and which type the shielded metal arc welding process requires.
- define open circuit voltage and operating voltage.
- explain arc blow, what causes it, and how to control it.
- tell what the purpose of a welding transformer is and what kind of change occurs to the voltage and amperage with a step-down transformer.
- compare generators and alternators.
- tell the purpose of a rectifier.
- read a welding machine duty cycle chart and explain its significance.
- demonstrate how to determine the proper welding cable size.
- demonstrate how to service and repair electrode holders.
- discuss the problems that can occur as a result of poor work lead clamping.
- describe the factors that should be considered when placing an arc welding machine in a welding area.
Chapter 4 Shielded Metal Arc Welding of Plate
Objectives:
- demonstrate safe work practices.
- demonstrate the ability to strike an arc at a specific point.
- list the problems that can result if the welding current is set too low or too high.
- discuss how to select the correct diameter of welding electrode for a weld.
- describe the effects of overheating a weld by comparing the bead's shape for width, reinforcement, and appearance.
- define arc length, and describe the effects of using too short or too long an arc length.
- compare a leading electrode angle to a trailing electrode angle.
- tell what characteristics of the weld bead can be controlled by the movement or weaving of the welding electrode.
- demonstrate 10 weave patterns for weld beads.
- discuss the importance of positioning the welder and the plate properly before starting to weld.
- give the characteristics of the three filler metal groups E6010 and E6011, E6012 and E6013, and E7016 and E7018.
- define stringer beads and tell how they are used.
- demonstrate stringer beads in all positions.
- demonstrate how to make a square butt joint in the flat, vertical up, and horizontal positions.
- demonstrate how to make a welded lap joint in the flat position, in the horizontal position, in the vertical position, and in the overhead position.
- demonstrate how to make a welded tee joint in the flat position, in the horizontal position, in the vertical position, and in the overhead position.