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2nd Year Stuff > Tig > Flashcards

Tig Flashcards

1
Q

Aws tig color green

A

Ewp
Pure tungsten

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2
Q

Aws tig color orange

A

2% ceriated

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3
Q

Aws tig color black

A

Lanthanated 1 or 2%

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4
Q

Aws tig color yellow

A

1% thoriated

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5
Q

Aws tig color red

A

2% thoriated

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6
Q

Aws tig color brown

A

Zirconium oxide

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7
Q

Aws tig color grey

A

Contain unspecified additional rare earth oxides

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8
Q

What is the advantage of ground finish electrodes over chemically cleaned?

A

Ground finished have better electrical contact with the collet

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9
Q

Cryogenic liquid def

A

Boiling point below -151.11 degrees c

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10
Q

Dewar def

A

A vessel containing cryogenic liquid gas

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11
Q

Argon is ________ than air

A

1.4 x heavier

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12
Q

The reason thoria is added to gtaw electrodes

A

Increase current carrying capacity and arc stability

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13
Q

What is the gtaw machines volt-amp curve

A

Steep drooping

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14
Q

What is the purpose of a regulator

A

To reduce the supply pressure to a safe working pressure

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15
Q

A flow meter is calibrated in

A

Liters per minute or cubic feet per hour

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16
Q

What is the purpose of a flow meter

A

To meter the flow of gas

17
Q

What is the purpose of tailing out at the end of a weld

A

To prevent cracking in the weld crater

18
Q

What is likely to happen if s keyhole forms in the 1 g position

A

Fall through

19
Q

What is suck back?

A

And area of the root bead has been drawn into the groove. Usually from overheating the root on the 2nd pass

20
Q

Dc gtaw

A

Requires the use of larger electrodes

21
Q
A

Wrong combination of filler to base metal

22
Q

The element in stainless steel that oxidizes readily is:

A

Chromium

23
Q

How much distortion due to thermal expansion occurs during welding stainless steel vs mild steel?

A

Stainless distorts 50% more

24
Q

What is a common work site method of testing for 300 / 200 series stainless

A

Use a magnet, its non magnetic

25
Q

Whats the advantage of using a flux covered rod

A

Preventing contamination on the root side

26
Q

ER316L is

A

E = Electrode
R = rod
316 = chemical composition
L = low carbon content (.03% max)

27
Q

How are wrought aluminum alloys visually identified?

A

Rolling marks and smooth finish

28
Q

It is essential to use plastic hoses fir what gas?

A

Helium

29
Q

When ac tig is used the electron and weld metal emit unequal amounts of electrons, causing an unbalanced sine wave. This is called:

A

Arc rectification

30
Q

Tig wire ER-70S-4, the 4 indicates?

A

Chemical analysis of the wire

31
Q

What is the minimum amount of chromium that must be added to iron to make stainless steel?

A

10 %

32
Q

Why can’t stainless be cut with an oxy torch?

A

Chromium oxides

33
Q

What types of stainless usually require preheat and post heat?

A

Ferritic and martensitic

2nd Year Stuff (4 decks)

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