Tig

Question 1

Aws tig color green

Answer 1

Ewp
Pure tungsten

Question 2

Aws tig color orange

Answer 2

2% ceriated

Question 3

Aws tig color black

Answer 3

Lanthanated 1 or 2%

Question 4

Aws tig color yellow

Answer 4

1% thoriated

Question 5

Aws tig color red

Answer 5

2% thoriated

Question 6

Aws tig color brown

Answer 6

Zirconium oxide

Question 7

Aws tig color grey

Answer 7

Contain unspecified additional rare earth oxides

Question 8

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

Answer 8

Ground finished have better electrical contact with the collet

Question 9

Cryogenic liquid def

Answer 9

Boiling point below -151.11 degrees c

Question 10

Dewar def

Answer 10

A vessel containing cryogenic liquid gas

Question 11

Argon is ________ than air

Answer 11

1.4 x heavier

Question 12

The reason thoria is added to gtaw electrodes

Answer 12

Increase current carrying capacity and arc stability

Question 13

What is the gtaw machines volt-amp curve

Answer 13

Steep drooping

Question 14

What is the purpose of a regulator

Answer 14

To reduce the supply pressure to a safe working pressure

Question 15

A flow meter is calibrated in

Answer 15

Liters per minute or cubic feet per hour

Question 16

What is the purpose of a flow meter

Answer 16

To meter the flow of gas

Question 17

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

Answer 17

To prevent cracking in the weld crater

Question 18

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

Answer 18

Fall through

Question 19

What is suck back?

Answer 19

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

Question 20

Dc gtaw

Answer 20

Requires the use of larger electrodes

Question 21

Answer 21

Wrong combination of filler to base metal

Question 22

The element in stainless steel that oxidizes readily is:

Answer 22

Chromium

Question 23

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

Answer 23

Stainless distorts 50% more

Question 24

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

Answer 24

Use a magnet, its non magnetic

Question 25

Whats the advantage of using a flux covered rod

Answer 25

Preventing contamination on the root side

Question 26

ER316L is

Answer 26

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

Question 27

How are wrought aluminum alloys visually identified?

Answer 27

Rolling marks and smooth finish

Question 28

It is essential to use plastic hoses fir what gas?

Answer 28

Helium

Question 29

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

Answer 29

Arc rectification

Question 30

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

Answer 30

Chemical analysis of the wire

Question 31

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

Answer 31

10 %

Question 32

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

Answer 32

Chromium oxides

Question 33

What types of stainless usually require preheat and post heat?

Answer 33

Ferritic and martensitic