Arc Welding Operations
Course Number: 119
The Arc Welding Operations textbook covers shielded metal arc welding, selecting electrodes for SMAW, gas metal and tungsten arc welding, preheating, reheating, welding ferrous and nonferrous metals, pipe welding, hard facing, and rebuilding.
Recommended Contact Hours – 15
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Table of Contents
Chapter 1: Shielded Metal Arc Welding
Topics: Welding current; Arc length; Welding machines; Polarity; Tools and accessories; Electrodes; Setup and operation; Personal protection
- Explain how the shielded metal arc welding process works.
- Tell what provides the shield in shielded metal arc welding.
- Define arc length and explain its importance.
- List factors to consider when selecting an electrode.
- Describe the personal protective equipment necessary for welding.
Chapter 2: Selecting Electrodes for SMAW
Topics: Electrode identification; Current ranges; Electrode coverings; Handling, storing, and conserving electrodes
- Explain the factors involved in selecting SMAW electrodes.
- Explain how to identify different welding electrodes.
- Give examples of several kinds of electrode coverings and tell when each is used.
- Describe correct procedures for handling, storing, and conserving electrodes.
Chapter 3: Gas Metal Arc Welding
Topics: GMAW vs SMAW; Metal-transfer methods; Shielding gases; Electrode wire; Equipment and accessories; Gun operation; Safety
- Name and describe the three basic types of metal transfer for GMAW.
- Name the most common shielding gases used in GMAW and tell what factors influence their selection.
- List factors that affect the selection of an electrode for GMAW.
- Describe GMAW gun operation.
Chapter 4: Gas Tungsten Arc Welding
Topics: GTAW process, equipment, current, torches, and electrodes; Shielding gases; Filler metals; Adding filler metal; Spot welding; Safety
- List the advantages of GTAW over other welding processes.
- Describe the equipment and supplies needed for GTAW.
- Explain the purpose of the electrode in GTAW and tell how this differs from other types of welding.
- Properly select shielding gases and filler metals for GTAW.
- Describe how to use GTAW to weld common metals.
Chapter 5: Other Welding Processes
Topics: Resistance, flash, percussion, flux-cored arc, submerged arc, plasma arc, stud, electron beam, laser beam, friction, and ultrasonic welding
- Describe resistance spot welding and resistance seam welding.
- Define flash welding, upset welding, and percussion welding, and tell how they differ.
- Explain how submerged arc welding and plasma arc welding differ from other arc welding methods.
- Describe the three forms of friction welding.
- Describe two advantages of ultrasonic welding.
Chapter 6: Preheating and Postheating
Topics: Stress; Changes in properties; When to preheat and postheat; Preheating equipment and methods; Spot preheating; Postheating methods
- Describe the effects of uneven or rapid heating and cooling on base metals and weld beads.
- Define the heat-affected zone and tell what changes can occur there during welding.
- Explain the benefit of preheating and when it should be used.
- List several factors in welding jobs that make postheating advisable.
- Describe methods and materials for preheating and postheating.
Chapter 7: Welding Ferrous Metals
Topics: Ferrous metal identification; Edge preparation; Welding cast iron, carbon steel, and alloy steel
- Define ferrous metals and describe their characteristics, including weldability.
- Explain cleaning and edge preparation required prior to welding ferrous metals.
- Name the welding processes and practices that are used for different types and thicknesses of ferrous metals.
- List several different electrode types and their advantages for welding ferrous metals.
- Explain specific procedures to use when welding alloy steels.
Chapter 8: Welding Nonferrous Metals
Topics: Nonferrous metal identification; Edge preparation; Cleaning; Welding aluminum, stainless steel, nickel, and copper
- Name the special properties of several nonferrous metals and explain how these properties affect welding preparations and procedures.
- Describe some of the methods of identifying different nonferrous metals.
- Compare seven arc cutting processes used for edge preparation of nonferrous metals.
- Explain proper methods of cleaning nonferrous metals prior to welding.
- Identify the welding processes that are suitable for nonferrous metals.
Chapter 9: Pipe Welding
Topics: Piping systems and joints; Codes; Pipe materials; Repair safety; Arc, oxyfuel welding processes; Types of welding joints; Edge preparation and fitup
- Compare the advantages of welded pipe joints to bolted or screwed connections.
- Discuss pipe welding codes and what they cover.
- List the welding processes used for joining pipe and their advantages and disadvantages.
- Identify some special methods and accessories that are used in pipe welding as opposed to flat welding.
- Give examples of the uses of preheating and postheating in pipe welding.
Chapter 10: Hard Facing and Rebuilding
Topics: Surfacing alloys; Base metals; Preheating; Surface bonding; Oxyacetylene, manual arc, and automatic hard facing; Thermal spraying
- List several purposes of hard facing and rebuilding.
- Identify the different types of surfacing alloys and their particular uses.
- Describe effective cross-checking and explain why it is desirable.
- Explain the special techniques used in hard facing and tell why they are necessary.
- Name the welding processes used in hard facing and tell why they are adapted to this work.
Add Chapters to Your Custom Book
- Chapter 1: Shielded Metal Arc Welding
- Chapter 2: Selecting Electrodes for SMAW
- Chapter 3: Gas Metal Arc Welding
- Chapter 4: Gas Tungsten Arc Welding
- Chapter 5: Other Welding Processes
- Chapter 6: Preheating and Postheating
- Chapter 7: Welding Ferrous Metals
- Chapter 8: Welding Nonferrous Metals
- Chapter 9: Pipe Welding
- Chapter 10: Hard Facing and Rebuilding
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