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Center for Curriculum and Transfer Articulation
Construction Welding III
Course: WLD202

First Term: 2021 Fall
 Lec + Lab   3.0 Credit(s)   5.0 Period(s)   5.0 Load  
Subject Type: Occupational
Load Formula: T Lab Load


Description: 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.



MCCCD Official Course Competencies
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-tungsten arc welding equipment, and describe the advantages of gas-tungsten arc welding over gas-metal arc welding. (VI, VII)
MCCCD Official Course Competencies must be coordinated with the content outline so that each major point in the outline serves one or more competencies. MCCCD faculty retains authority in determining the pedagogical approach, methodology, content sequencing, and assessment metrics for student work. Please see individual course syllabi for additional information, including specific course requirements.
 
MCCCD Official Course Outline
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. Shielding 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
 
MCCCD Governing Board Approval Date: 6/24/2008

All information published is subject to change without notice. Every effort has been made to ensure the accuracy of information presented, but based on the dynamic nature of the curricular process, course and program information is subject to change in order to reflect the most current information available.