GMAW Quiz and Flashcards: Mastering Welding Terms

What does GMAW stand for?

What is the function of deoxidizers in GMAW?

What is the purpose of the silicon bead in GMAW electrodes?

What does the abbreviation 'ER' stand for in GMAW electrode designation?

What is the range for the gas flow rate required for GMAW?

How many basic metal transfer modes are there in GMAW?

Which shielding gas is required for spray transfer mode in GMAW?

For which type of welding is short circuiting transfer mode excellent?

What is the main characteristic of pulsed transfer mode in GMAW?

What is the current level above which spray transfer can be achieved?

What does electrode extension affect in GMAW?

What are the advantages of GMAW?

What are the limitations of GMAW?

What are potential discontinuities in GMAW?

What is GMAW effective and efficient for welding?

What results from the use of metal core electrodes in GMAW for welding steel armor?

Fundamentals of Gas Metal Arc Welding (GMAW)

GMAW requires a gas supply with a flow rate of 28-50 cfh and specific equipment such as a cylinder, pressure regulator, and flowmeter.
Metal transfer modes in GMAW depend on power level, shielding gas type, power source controls, and output.
There are four basic metal transfer modes: spray, globular, short circuiting, and pulsed, each with different characteristics and applications.
Spray transfer mode requires 80% argon, minimum, and is suitable for high power, high deposition, flat position welding.
Short circuiting transfer mode is excellent for sheet metal, open root, and out-of-position welding but may result in incomplete fusion in thick sections.
Pulsed transfer mode is essentially an intermittent spray transfer, with one droplet per pulse, and can be used for the same applications as short circuiting, plus thick sections.
Transition current is the current level above which spray transfer can be achieved.
Electrode extension is a critical variable in GMAW, affecting deposition, fusion, and shielding effectiveness.
GMAW advantages include high productivity, clean process, continuous filler metal feed, and the ability to weld most alloys.
GMAW limitations include unsuitability for windy conditions, little tolerance for contamination, complexity of equipment, and consumable requirements.
Potential discontinuities in GMAW include porosity, incomplete fusion, incomplete joint penetration, undercut, and cracking, each caused by various factors.
GMAW is an effective and efficient process for welding steel armor, with the use of metal core electrodes resulting in improved overall weld quality and acceptable welds with little or no cleanup required.

Test your knowledge of Gas Metal Arc Welding (GMAW) with this quiz. Explore the fundamentals, including equipment requirements, metal transfer modes, advantages, limitations, and potential discontinuities. Gain insight into GMAW's applications, electrode extension, and its effectiveness in welding steel armor.