Standard

 

WLD 109 Gas Metal Arc Welding (GMAW/MIG)

Course Description

Provides knowledge of theory, safety practices, equipment and techniques required for successful gas metal arc welding. Qualification tests, all positions, are used in the evaluation of student progress toward making industrial standard welds. Topics include: GMAW safety and health practices; GMAW theory, machines, and set up; transfer modes; wire selection; shielded gas selection; and GMAW joints in all positions.

 

Competency Areas

Hours

 

GMAW Safety and Health Practices

Class

3

GMAW Theory, Machines, and Set Up

D. Lab

4

Transfer Modes

P. Lab/O.B.I.

3

Wire Selection

Credit

6

Shielded Gas Selection

 

 

GMAW Joints in All Positions

 

 

 

 

 

Prerequisite:

WLD 100

Corequisite:

 

 

Course Guide

 

Competency

After completing this section, the student will:

Hours

Class

D.Lab

P.Lab/

O.B.I.

GMAW SAFETY AND HEALTH PRACTICES

5

4

3

Personal protection

List and apply basic safety and health practices, rules for GMAW, Ventilation.

 

 

 

Electric shock

Practice safe habits in the shop.

 

 

 

Fire and explosion hazards

Discuss common safety rules.

 

 

 

GMAW THEORY, MACHINES AND SET UP

5

4

3

Theory

Define GMAW.

Apply GMAW theory to welds.

 

 

 

Machines and set up

Identify and select correct size and setting on welding machines.

 

 

 

TRANSFER MODES

5

4

3

Spray transfer process

Pulsed spray

Globular metal transfer

Explain and apply each transfer process.

 

 

 

WIRE SELECTION

5

4

3

Wire material

List and identify ferrous and non-ferrous metals.

 

 

 

Wire sizes

List and explain wire sizes.

 

 

 

SHIELDED GAS SELECTION

5

4

3

100% Argon

Identify and select the correct gas for welding application.

 

 

 

75% Argon and 25% Carbon dioxide

Identify and select the correct gas for welding application.

 

 

 

100% Carbon dioxide

Identify and select the correct gas for welding application.

 

 

 

Helium

Identify and select the correct gas for welding application.

 

 

 

GMAW JOINTS IN ALL POSITIONS

5

20

15

Mild steel Light gage 1Gand 2G; plate 3G/ Stainless steel Light gage 1Gand 2G; plate 3G/ Aluminum Light gage 1Gand 2G; plate 3G

Weld tee joints and butt joints in all 3 positions using mild steel, stainless steel and aluminum correctly.

 

 

 

 

Suggested Resources

 

Suggested Resources include textbooks shown below or most current edition.

 

Welding Links

 

American Welding Society http://www.amweld.org/

Welders Bookstore http://www.amweld.org/

 

Books

 

Althouse, A. D., & Turnquist, C. H. (1992). Modern welding. South Holland, IL: Goodheart-Willcox.

http://www.goodheartwillcox.com/

American National Standards Institute. (Latest Edition). ANSI codes and standards. New York: Author.

http://www.normas.com/AWS/

The American Society of Mechanical Engineers. (Latest Edition). ASME codes and standards. New York: Author.

http://www.normas.com/AWS/

American Welding Society. (Latest Edition). AWS codes and standards. Miami: Author.

http://www.normas.com/AWS/

Giachino, J. W., et al. (1992). Welding skills and practices. Kalamazoo, MI: Books Demand.

http://www.upublish.com/

Griffin, I. H., et al. (Latest Edition). Welding processes (3rd ed.). Albany, NY: Delmar.

http://www.delmar.com/

Sacks, R. J. (Latest Edition). Welding principles and practices (4th ed.). Peoria, IL: Bennett.

       http://www.spartacus.schoolnet.co.uk/Jbennett.htm

Smith, P. (Latest Edition). Welding skills and technology. New York: McGraw-Hill.

http://www.bookstore.mcgraw-hill.com/