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Millwright Block 2 (harmonized) NS > GTAW (tig) > Flashcards

GTAW (tig) Flashcards

1
Q

What does GTAW stand for?

A

Gas tungsten Arc Welding

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2
Q

What are the two main methods of GTAW welding?

A

Fusion Autogenous (no filler)
Filler welding

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3
Q

What is the easiest way to visually tell if a GTAW weld is Autogenous or not?

A

Concave = Autogenous (fusion)
Convex = filler added

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4
Q

What is the 4 basic GTAW equipment required?

A

Power source
Torch assembly
Inert gas delivery system
Weld cleaning and finishing tool

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5
Q

What is the minimum point on a GTAW tungsten electrode?

A

2-2.5” point

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6
Q

What gas is used for GTAW?

A

Inert either Argon or helium

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7
Q

What are two common names for GTAW? (Not including tig)

A

Heli-arc
Argon-arc

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8
Q

What kind of power source is used for GTAW?

A

Constant current

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9
Q

List 3 types of alternating currents used for GTAW aluminum

A

Sine wave
Square wave
Asymmetrical wave

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10
Q

At what amperage should GTAW torches be water cooled?

A

200 amps

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11
Q

Torches for GTAW that are below what amperage have the ability to be air cooled?

A

200 amps

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12
Q

What kind of wire brush should be used to clean aluminum?

A

Stainless steel

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13
Q

What is important to remember when choosing a collet with GTAW?

A

That it is the proper size to hold the tungsten electrode

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14
Q

What gas in GTAW makes it easiest to start an arc?

A

Argon

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15
Q

Which has in GTAW creates the hottest arc?

A

Helium

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16
Q

What is important to remember with the flow rate of helium in terms of GTAW?

A

Must be 2-3x greater than Argo

17
Q

Why must heliums flow rate be higher than argon in terms of GTAW?

A

It’s light so it floats away

18
Q

What can excess gas flow rates do to GTAW?

A

Entrap has
Leading to weld defects

19
Q

What filler metals should NOT be used when welding carbon steel with GTAW?

A

Oxyacetylene filler rods
Or dirty metals (coat hangers)

20
Q

How large should the arc length be in comparison to the electrode diameter in terms of GTAW?

A

Equal to

21
Q

What is the proper filler metal angle in terms of the base metal in GTAW?

A

10-20 degrees

22
Q

What can happen to the tungsten electrode when too high of an amperage is used?

A

It can melt and contaminate the metal

Millwright Block 2 (harmonized) NS (17 decks)

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