Maricopa Community Colleges  ABC265   19956-20032 
Official Course Description: MCCCD Approval: 04/25/95
ABC265 19956-20032 LEC 0.50 Credit(s) 0.50 Period(s)
Welding Machines
Specific types of welding machines, electrical characteristics, operation, NEC applications and grounding. Also hazards, overcurrent protection and sizing grounding electrodes. Prerequisites: (Indentured status with the Arizona Builders Alliance and ABC142), or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC265   19956-20032 Welding Machines
1. Define welding trade terms, identify specific classifications of welding machines and describe their characteristics and operation. (I)
2. Describe proper grounding techniques for specific welding machines and describe the hazards associated with misuse. (II)
3. Explain National Electrical Codes (NEC) regarding electric welders and overcurrent protection requirements. (III)
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MCCCD Official Course Outline:
 
ABC265   19956-20032 Welding Machines
    I. Welding Machines
        A. Trade Terms
          1. Amperage
          2. Arc
          3. DCRP (direct current reverse polarity)
          4. DCSP (direct current straight polarity)
          5. Duty cycle
          6. Electrode
          7. FCAW (flux core arc welding)
          8. GMAW (gas metal arc welding)
          9. GTAW (gas tungsten arc welding)
          10. Ground
          11. Polarity
          12. SMAW (shielded metal arc welding)
          13. Weld
          14. Welding cables
        B. Welding fundamentals
          1. Welding current A/C
          2. Welding current D/C
        C. Electrical characteristics of welding circuits
          1. Open circuit voltage
          2. Operating voltage
          3. Arc blow
        D. Welding machine classifications
          1. A/C
          2. D/C
          3. A/C and D/C
        E. Types of welding machines
          1. Transformers
          2. Transformer rectifiers
          3. Inverter
          4. Motor generators
          5. Engine-driven generators and alternators
        F. Welder Ratings
      II. Welding Cable
          A. Welding cable terminations
          B. Lugs and quick disconnects
          C. Ground clamps
          D. Electrode holders
          E. Welding equipment set-up
            1. Stringing welding cable
            2. Locating ground clamp
            3. Energizing electrically powered welding machines
          F. Hazards
        III. NEC Requirements for Electric Welders
            A. Article 630
            B. AC transformer and DC arc welders
            C. Motor generator arc welders
            D. Resistance welders
            E. Overcurrent protection for welders and conductors
            F. Installing welding cables (NEC 300-21)
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