I. General Information

1. Course Title:
Gas Tungsten Arc Welding (GTAW)

2. Course Prefix & Number:
CMAE 1568

3. Course Credits and Contact Hours:

Credits: 3

Lecture Hours: 1.5

Lab Hours: 0.75

4. Course Description:

This course covers the safety hazards and applications for Gas Tungsten Arc Welding (GTAW) in the welding industry. Material covered will be power sources, setup, types of current, current selection, shielding gases, and torch types. Procedures and potential problems welding various metals (Aluminum, Stainless Steel, and Mild Steel) will be addressed in this course. Applications for the process in different industries, as well as the use of back purging will be discussed. Welds will be made in the flat, horizontal, vertical and overhead positions. Written and fundamental tests will be completed in accordance with the American Welding Society (AWS) codes and standards.

5. Placement Tests Required:

Accuplacer (specify test):

Reading College Level CLC or Reading College Level, and Fundamentals of Math Pre-College Level or Math Pre-College Level or Math Introductory College Level or Algebra College Level or Pre-Calculus College Level or Calculus College Level

Score:

6. Prerequisite Courses:

There are no prerequisites for this course.

9. Co-requisite Courses:

There are no corequisites for this course.

II. Transfer and Articulation

1. Course Equivalency - similar course from other regional institutions:

This course is offered collaboratively with Central Lakes College, Hennepin Technical College, Lake Superior College, Northland Community & Technical College, Northwest Technical College, Pine Technical & Community College, Riverland Community College, Saint Paul College, and St. Cloud Technical & Community College through the Minnesota State Advanced Manufacturing Center of Excellence. Courses are transferable within all the listed colleges.

III. Course Purpose

1. Program-Applicable Courses – This course is required for the following program(s):

Welding Technology, Certificate

IV. Learning Outcomes

1. College-Wide Outcomes

College-Wide Outcomes/Competencies	Students will be able to:
Analyze and follow a sequence of operations	Demonstrate the different methods of adding filler metal when utilizing GTAW.
Utilize appropriate technology	Operate GTAW equipment according to industry standards and practices.
Work as a team member to achieve shared goals	Demonstrate safety habits consistent with industry standards and college policy.

2. Course Specific Outcomes - Students will be able to achieve the following measurable goals upon completion of the course:

• Demonstrate the proper use of Personal Protective Equipment (PPE) during welding;
• Demonstrate safety habits consistent with industry standards and college policy;
• Operate GTAW equipment according to industry standards and practices;
• Differentiate GTAW setup requirements and techniques from other welding processes;
• Evaluate the various types of power sources, types of current, and applications utilized in GTAW;
• Demonstrate the different methods of adding filler metal when utilizing GTAW;
• Analyze the metallurgical properties of ferrous and nonferrous metals using industry-recognized terminology;
• Demonstrate proper electrode preparation for desired weld characteristics based on ferrous and nonferrous metals;
• Demonstrate welds in the flat, horizontal, vertical, and overhead positions utilizing GTAW aligned with industry codes and practices; and
  
• Examine the GTAW applications used in current industry practices.

V. Topical Outline

Listed below are major areas of content typically covered in this course.

1. Lecture Sessions

1. Weld Discontinuities
• Porosity
• Undercut
• Incomplete fusion
• Incomplete joint penetration
• Excessive reinforcement
• Under-fill
• Concave root surface (suck-back)
• Non-uniformity
• Improper leg size
• Overlap
• Arc-strikes
• Slag Inclusions
2. Arc Wave Shape
• Sign wave
• Square wave
3. Square Wave Manipulations
• Penetration
• Cleaning
4. Ac Frequency
• Hertz manipulation
5. Tungsten
• Compositions
• Proper grinding techniques
6. Stainless steel     
• Purge
7. Welding Process Sheet
• Pre-qualified
8. Welding Qualification Record
• Destructive test
• Non-destructive test

2. Laboratory/Studio Sessions

1. Puddle Fusion
• ER70S-6 rod 1/16
• ER70S-6 rod 3/32
• ER70S-6 rod 1/8
2. A36 Carbon Steel Plate
• Lap
• Tee
• Outside corner
• Groove
• Multi-pass
3. Carbon steel Pipe
• Pipe to plate
• Pipe to pipe
• Pipe caps
• Coped pipe joints
4. Weld Positions
• Flat
• Horizontal
• Vertical
• Overhead
5. Amperage Control
• Foot pedal
• Scratch start
• Lift arc
• Hand control
6. Multi pass
• Tee
• Lap
7. Groove Weld (Open Root)
• Root pass
• Filler passes
• Cover pass
8. Groove Weld (Backing strip)
• Root pass
• Filler passes
• Cover pass
• Backer removal
9. Destructive Testing
• Root
• Face
10. Pipe to Plate
• Die penetrant test
11. Puddle Fusion
• Alum
• Stainless steel
12. Stainless Steel
• Lap
• Tee
• Groove Multi-Pass
13. Pressure Vessel
• Steel
• Stainless Steel
• Alum