Portland Community College | Portland, Oregon

Course Number:
WLD 221
Course Title:
Gas Tungsten Arc Welding Mild Steel
Credit Hours:
4
Lecture Hours:
0
Lecture/Lab Hours:
80
Lab Hours:
0
Special Fee:
$24.00

Course Description

Develops knowledge and skills welding common joints in all positions on mild steel using the Gas Tungsten Arc Welding (GTAW) process. Prerequisites: Department permission required. Audit available.

Addendum to Course Description

This is an outcome based course utilizing a lecture/lab format. This course includes classroom discussions, videotapes, and lab demonstrations of technical skills.  Course outcomes will include: theoretical concepts, layout, fabrication and welding, 

Intended Outcomes for the course

Upon completion of the course students will be able to:

  • Function safely in the PCC Welding Lab.
  • Interpret blueprints to accurately lay out, prepare, and assemble weld joints.
  • Understand and apply fundamentals of GTAW operations on mild steel.
  • Weld common joint assemblies with GTAW to AWS D1.1 Structural Steel Welding Code visual acceptance criteria in all positions.
  • Apply visual examination principles and practices in accordance with AWS D1.1.

Course Activities and Design

Welding lec/lab courses are Open Entry and Open Exit (OE/OE) and are offered concurrently. Courses are designed to meet the needs of the students with flexible scheduling options.  Students may attend full time or part time. This is an OE/OE course which does not align with the normal academic calendar.

Outcome Assessment Strategies

The student will be assessed on his/her ability to demonstrate the development of course outcomes. The methods of assessment may include one or more of the following: oral or written examinations, quizzes, written assignments, visual inspection, welding tests and task performance.   

Course Content (Themes, Concepts, Issues and Skills)

Function safely in the PCC Welding Lab.

  • Understand and practice personal safety by using proper protective gear
  • Understand and practice power tool safety
  • Understand and maintain a safe work area
    • Recognize and report dangerous electrical and air/gas hose connections
    • Understand and practice fire prevention

Interpret blueprints to accurately lay out, prepare, and assemble weld joints on mild steel.

  • Interpret lines, symbols, views and notes
  • Lay out material per specifications
  • Assemble project per specifications

 Understand and apply fundamentals of GTAW operations on mild steel.

  • Describe and demonstrate equipment setup, shut down, and operation
  • Identify  electrode types
  • Demonstrate proper arc length and travel speed
  • Demonstrate correct starting, stopping and restarting techniques
  • Demonstrate proper bead placement

Weld common joint assemblies with the GTAW to AWS D1.1 Structural Steel Welding Code visual acceptance criteria in the following joints and positions:

 Flat Position:

  • Fuse weld a flat position edge joint
  • Fuse weld flat position corner joint
    • Butt joint
    • T-Joint

Horizontal Position:

  • T-Joint
  • Lap Joint
  • Outside Corner Joint
  • Butt Joint

Vertical Position:

  • T-Joint  
  • Lap Joint
  • Outside Corner Joint
  • Butt Joint

Overhead Position:

  • T-Joint
  • Lap Joint
  • Outside Corner Joint               

Apply visual examination principles and practices in accordance with AWS D1.1.

  • Evaluate welds using appropriate welding inspection tools
  • Assess weld discontinuities causes and corrections