MCCCD Program Description

Arc Welding III

Course: WLD106AC

First Term: 2015 Fall

Lec + Lab 5 Credit(s) 8 Period(s) 7.1 Load
Subject Type: Occupational
Load Formula: S- Standard

Description: Electric welding with emphasis on metallic arc welding in out-of-position 3G, 4G practice and procedures using 7018 fill freeze electrodes in fillet and groove welds.

MCCCD Official Course Competencies
1. Identify the various types of welding power supplies used in industry. (I) 2. Perform two techniques of striking the arc and running stringer beads in the flat position. (II, IV) 3. Describe the four key points of arc welding. (III) 4. Perform three types of welding beads on fillet and groove weld joints in position and out of position on steel plate using 7018 fill freeze electrodes (IV) 5. Identify a variety of electrodes and the classifications of each. (V) 6. Prepare welding joints, set-up and weld procedure. (VI) 7. Describe different types of welding techniques and their uses. (VII) 8. Analyze welding quality as it relates to inspection and quality control. (VIII) 9. Recognize weld defects and their causes and possible corrections. (IX) 10. Identify four basic types of carbon steel and alloy steels. (X) 11. Explain the process of tacking plates together for distortion control and welding sequence. (XI) 12. Describe various certification techniques used in industry. (XII) 13. Explain test methods used for certification of welds and quality control. (XIII) 14. Identify the common physical properties of materials and their uses. (XIV) 15. Describe factors a person should consider before welding. (XV)
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. Machines A. Generator B. Transformer C. Transformer-rectifier D. Step E. Stepless II. Arc A. Tapping B. Strike III. Four Key Points A. Arc Length B. Speed of Travel C. Volume of Heat D. Angle of Rod IV. Beads A. Stringer B. Weave C. Whipping V. Electrodes A. Classification B. Heat Range C. Coating Types D. Diameter E. Storage F. Positions VI. Metal Preparation A. Size and Shape B. Types of Joints C. Set-up D. Edge Preparations E. Metal Thickness VII. Welding Techniques A. Stringer Bead B. Weave bead C. Direction of Weld VIII. Weld Quality A. Penetration B. Fusion C. Weld Passes D. Size and Shape of Beads IX. Weld Defects A. Undercut B. Slag Inclusions C. Gas Pockets D. Poor Contour E. Lack of Fusion X. Types of Metals A. Low-Carbon Steel B. Medium-Carbon Steel C. High-Carbon Steel D. Alloy Steels XI. Distortion Control A. Tacking B. Preset C. Weld Sequence D. Jigs and Fixtures E. Preheat F. Welding Speed XII. Testing and Certification A. Positions B. Joint Set-up C. Rd Type E7018 D. Testing Method E. Allowable Flaws XIII. Test Methods A. Guided Bend B. Tensile Pull C. Magnaflux D. X-ray E. Ultrasonic XIV. Physical Properties of Metal A. Tensil Strength B. Ductility C. Hardness D. Elongation E. Melting Point F. Elasticity XV. Considerations Before Welding A. Type of Steel B. Hardness C. Crack Sensitivity D. Preheat E. Type of Rod F. Type of Current G. Direction of Weld H. Speed of Weld I. Distortion Control Method J. Rate of Cooling K. Process to Use L. In-Service Use of Piece M. Cost of Production vs. Cost of Repair

MCCCD Governing Board Approval Date: June 16, 2015

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.