GTAW (tig) Flashcards
What does GTAW stand for?
Gas tungsten Arc Welding
What are the two main methods of GTAW welding?
Fusion Autogenous (no filler)
Filler welding
What is the easiest way to visually tell if a GTAW weld is Autogenous or not?
Concave = Autogenous (fusion)
Convex = filler added
What is the 4 basic GTAW equipment required?
Power source
Torch assembly
Inert gas delivery system
Weld cleaning and finishing tool
What is the minimum point on a GTAW tungsten electrode?
2-2.5” point
What gas is used for GTAW?
Inert either Argon or helium
What are two common names for GTAW? (Not including tig)
Heli-arc
Argon-arc
What kind of power source is used for GTAW?
Constant current
List 3 types of alternating currents used for GTAW aluminum
Sine wave
Square wave
Asymmetrical wave
At what amperage should GTAW torches be water cooled?
200 amps
Torches for GTAW that are below what amperage have the ability to be air cooled?
200 amps
What kind of wire brush should be used to clean aluminum?
Stainless steel
What is important to remember when choosing a collet with GTAW?
That it is the proper size to hold the tungsten electrode
What gas in GTAW makes it easiest to start an arc?
Argon
Which has in GTAW creates the hottest arc?
Helium
What is important to remember with the flow rate of helium in terms of GTAW?
Must be 2-3x greater than Argo
Why must heliums flow rate be higher than argon in terms of GTAW?
It’s light so it floats away
What can excess gas flow rates do to GTAW?
Entrap has
Leading to weld defects
What filler metals should NOT be used when welding carbon steel with GTAW?
Oxyacetylene filler rods
Or dirty metals (coat hangers)
How large should the arc length be in comparison to the electrode diameter in terms of GTAW?
Equal to
What is the proper filler metal angle in terms of the base metal in GTAW?
10-20 degrees
What can happen to the tungsten electrode when too high of an amperage is used?
It can melt and contaminate the metal
