Maricopa Community Colleges  TDR202   19886-20085 
Official Course Description: MCCCD Approval: 12/10/85
TDR202 19886-20085 L+L 3 Credit(s) 5 Period(s)
Construction Welding III
Metal arc welding processes, blueprint and weld symbol reading, joint layout preparation and welding procedures, gas-tungsten arc welding with related instruction in practice on ferrous and nonferrous metals.
Prerequisites: TDR201 or permission of Instructor.
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MCCCD Official Course Competencies:
 
TDR202   19886-20085 Construction Welding III
1. List and describe the various types of testing positions. (I, V)
2. Describe the procedures used in various types of metal testing. (II, V)
3. Identify the composition of the various types of metals. (III)
4. Describe the metals used in the tensile strength test. (IV)
5. Draw and describe the symbols used in welding diagrams. (IV)
6. List and describe the equipment used in gas-tungsten arc welding. (VI)
7. Explain the complete process used in gas-tungsten arc welding including tool safety. (VI)
8. List and describe the equipment used in gas-metal arc welding. (VII)
9. Describe the procedures used in gas-metal arc welding processes. (VII)
10. Explain the application of gas-metal arc welding and the type of work it would be used for. (VII)
11. Explain the differences between gas-metal arc welding and gas-tungstenarc welding equipment, and describe the advantages of gas-tungsten arcwelding over gas-metal arc welding. (VI, VII)
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MCCCD Official Course Outline:
 
TDR202   19886-20085 Construction Welding III
    I. Testing Positions
        A. Flat
        B. Horizontal
        C. Vertical
        D. Overhead
      II. Testing Procedures
          A. Joint Type
          B. Position of Work
          C. Material Analysis
          D. Testing Method
          E. Allowable Tolerance
        III. Metal Identification
            A. Appearance
            B. Weight
            C. Spark Test
            D. Hardness
            E. Magnetism
            F. Cross Sectional Break Area
          IV. Test Methods
              A. Guided Bend Test
              B. Tensile Strength Test
              C. X-Ray Examination
              D. Ultrasonic Test
              F. Static Load Test
            V. Blueprint Symbols
                A. Joint Symbol Identification
                B. Weld Symbol Identification
                C. Weld Location Signs
                D. Weld Duration Signs
                E. Detail Information
                F. Material List
              VI. Layout
                  A. Short Method
                  B. Templates
                  C. Locking Methods
                  D. Measurements
                  E. Weld Sequence
                VII. Gas-Tungsten Arc Welding
                    A. Description of Process
                      1. Arc Stream
                      2. Shielding of Molten Metal
                      3. Adding of Filler Metal
                    B. Equipment
                      1. AC Machine
                      2. DC Machine
                      3. Torches
                      4. Tungsten Electrodes
                      5. Electrical System
                      6. Gas System
                      7. Water System
                    C. Procedures
                      1. Joint Design
                      2. Cleaning
                      3. Weld Backing
                      4. Welding Current
                      5. Welding Speed
                      6. Arc Length
                      7. Tungsten Electrode Diameter
                      8. Welding Techniques
                      9. Gas Flow Rate
                      10. Cup Sizes
                      11. Rod Composition
                      12. High-frequency Current
                      13. Striking the Arc
                      14. Fouling of the Electrode
                    D. Application
                      1. Aluminum
                      2. Stainless Steel
                      3. Magnesium
                      4. Carbon Steels
                      5. Cast Iron
                      6. Hard Facing
                      7. Copper
                      8. Copper Alloys
                      9. Tool Steel
                    E. Advantages
                      1. No Smoke
                      2. No Spatter
                      3. No Finishing of Welds
                      4. Weld Quality
                      5. Appearance
                  VIII. Gas/Metal/Arc Welding
                      A. Description of Process
                        1. Arc Stream
                        2. Shielding of Arc and Molten Puddle
                        3. Mechanical Adding of Filler Rod
                      B. Equipment
                        1. DC Generator
                        2. Transformer Rectifier
                        3. Wire Feeder
                        4. Wire Feed Gun
                        5. Electrical System
                        6. Sheilding Gas System
                        7. Possible Water System
                      C. Procedures
                        1. Joint Design
                        2. Cleaning
                        3. Wire Diameter
                        4. Voltage
                        5. Wire Speed Amperage
                        6. Welding Techniques
                        7. Gas Flow Rate
                        8. Nozzle Size
                        9. Drive Roll Pressure
                      D. Application
                        1. Aluminum
                        2. Stainless Steel
                        3. Carbon Steels
                        4. Hardfacing
                        5. Buildup Work
                        6. High-Speed Production
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