Stainless Steel GTAW/TIG Fabrication 1

Course Number: MFG 286
Transcript Title: Stainless Steel GTAW/TIG Fab 1
Created: March 25, 2021
Updated: March 25, 2021
Total Credits: 3
Lecture Hours: 0
Lecture / Lab Hours: 60
Lab Hours: 0
Satisfies Cultural Literacy requirement: No
Satisfies General Education requirement: No
Grading options: A-F (default), P-NP, audit
Repeats available for credit: 0

Prerequisites

Course Description

Builds on the skills learned in MFG 285 by introducing welding to AWS code for stainless steel alloys. Introduces fabrication of stainless steel assemblies and the different procedural and prep changes for different stainless steel alloys. Presents AWS tolerances in color and purity in stainless steel welding, and experiments with a range of outcomes and how they differ both practically and chemically. Prerequisites: MFG 285. Audit available.

Intended Outcomes

Upon successful completion of this course, students will be able to:

  1. Create Position 2 Fillet weldments using DC GTAW processes suitable for destructive testing as per AWS D1.6 code.
  2. Create Position 2 Groove weldments using DC GTAW processes suitable for destructive testing as per AWS D1.6 code.
  3. Manufacture stainless steel multi-part assemblies.
  4. Identify weld errors in stainless steel DC GTAW welding and necessary corrections.
  5. Recognize and explain changes in procedure when dealing with different stainless steel alloys.
  6. Demonstrate knowledge of AWS acceptable color and surface tolerances and the procedural relationship of those colors and surfaces to process.

Outcome Assessment Strategies

Outcomes are assessed through a mixture of hands on and written assessments.  Priority is given to hands-on proficiency based assessment in an environment that rewards demonstration of skill needed for success in industry.

  • Lecture and in booth coaching and direct instruction.
  • Direct instruction in full class demonstration of skills.
  • Written exams.
  • Student proficiency through demonstration of learned strategies and skills in industry standard environment.
  • Mock AWS Testing procedure (destructive testing) or mock local industry supported on-site testing procedures.
  • Job readiness based on performance.
  • In class lab experiments and testing using the scientific process with written result reporting.

Texts and Materials

Resources are available openly on the web, but largely the curriculum adaptation needs to be done based on the instructors existing skill set.  Since there are many ways to teach the content, the “teach what you know, and teach well what you do” is very appropriate for courses like this.

The following books are recommended:
  • Welding Skills, 5th Edition, B.J. Moniz
  • Welding Skills Workbook, 5th Edition, Jonathan F. Gosse
Some Suggested resources:
  • AWS Structural Code Book 2020
  • Aeorspacewelding.com
  • Thefabricator.com
  • Aws.org
  • Millerwelds.com
  • Lincolnelectric.com

Course Activities and Design

The determination of teaching strategies used in the delivery of outcomes is generally left to the discretion of the instructor. Here are some strategies that you might consider when designing your course: lecture, small group/forum discussion, flipped classroom, dyads, oral presentation, role play, simulation scenarios, group projects, service learning projects, hands-on lab, peer review/workshops, cooperative learning (jigsaw, fishbowl), inquiry based instruction, differentiated instruction (learning centers), graphic organizers, etc.

Course Content (Themes, Concepts, Issues and Skills)

Outcome #1: Create Position 2 Fillet weldments using DC GTAW processes suitable for destructive testing as per AWS D1.6 code.
  • Understand American Welding Society (AWS) D1.6 structural code for DC GTAW stainless steel fillet weld process in position 2.
  • Prepare plate for welding according to structural standard.
  • Weld plate to code specification.
  • Prepare plate for destructive testing per AWS Code.
  • Interpret destructive testing results.
Outcome #2: Create Position 2 Groove weldments using DC GTAW processes suitable for destructive testing as per AWS D1.6 code.
  • Understand American Welding Society (AWS) D1.6 structural code for DC GTAW stainless steel groove weld process in position 2.
  • Prepare plate for welding according to structural standard.
  • Weld plate to code specification.
  • Prepare plate for destructive testing per AWS Code.
  • Interpret destructive testing results.
Outcome #3: Create multi-part assemblies from stainless steel components with attention to tolerance and appropriate interpretation of a weld procedure specification (WPS).
  • Demonstrate stainless steel specific design processes in creation of a fabricated multi-part assembly.
  • Identify possible problems in assemble and manufacturing of multi-part assemblies as they pertain to GTAW DC stainless steel.
  • Create a mock weld procedure specification (WPS) for a multi-part assembly correctly identifying procedures for weldment prep, and process preparation.
  • Assemble to tolerance a stainless steel multi-part assembly.
Outcome #4: Identify weld errors in stainless steel DC GTAW welding and necessary corrections.
  • View and determine amperage problems and corrections.
  • View and determine gas flow and purging problems and corrections.
  • Practice chemical corrections to stainless steel parts to retain austenitic properties.
  • Demonstrate knowledge and procedures for mechanical corrections to stainless steel properties to retain austenitic properties.
Outcome #5: Recognize and explain changes in procedure when dealing with different stainless steel alloys
  • Understand amperage rates and best practices for 304, 308 and 316 stainless steel alloys.
  • Understand amperage rates and best practices for 304, 308 and 316 stainless steel alloys.
  • Know basic filler rod preparation techniques.
  • Show knowledge of potential weldment issues when using incorrect filler or mixing filler types in stainless steel welding procedures.
  • Explain gas flow rate differences for different alloys and procedures.
  • Demonstrate knowledge of equipment differences necessary when welding 304, 308 and 316 stainless steel alloys.
Outcome #6: Demonstrate knowledge of AWS acceptable color and surface tolerances and the procedural relationship of those colors and surfaces to process.
  • Read and understand AWS coloring, gas types, purging, and surface oxidation literature and charts.
  • Accurately reproduce different coloring / surface oxidations according to AWS tolerance charts.
  • Demonstrate knowledge of different applications of oxidation in stainless steel welding as appropriate.

Department Notes

Safety glasses are required at all times in the welding lab and are provided for students. Students may also purchase their own safety glasses from a local supplier. Long pants and closed toed shoes are required in the welding lab at all times. Appropriate clothing must be worn to work in the lab (no synthetic materials, ect.). Safety requirements are covered prior to work in the lab.