Review Questions - GTAW Flashcards

Gas Tungsten Arc Welding

1
Q

Purging is used during QTAW to:

  1. protect the root from oxygen and nitrogen
  2. protect the tungsten
  3. protect the weld pool surface
  4. protect the work lead connection
A

protect the root from oxygen and nitrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which of the following is used as a shielding gas for GTAW?

  1. oxygen
  2. nitrogen
  3. phosgene
  4. argon
A

argon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

When is a gas lens used with GTAW?

  1. to improve shielding of the weld pool
  2. to increase weld cooling rate
  3. to prevent laminar flow of shielding gas
  4. to control weld pool shrinkage
A

to improve shielding of the weld pool

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which type of current is used for GTAW of stainless steel?

  1. DCEP
  2. ACHF
  3. DCEN
  4. ACPG
A

DCEN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a suitable shielding gas flow rate for GTAW on DCEN using a #6 gas cup?

  1. 5 l/min (11cfh)
  2. 10 l/min (22 cfh)
  3. 15 l/min (33 cfh)
  4. 20 l/min (44 cfh)
A

5 l/min (11cfh)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which of the following desgnates an “unalloyed” tungsten?

  1. EWZr-1
  2. EWP
  3. EWCe-1
  4. EWTh-2
A

EWP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Post flow of shielding gas when GTA welding is used to:

  1. protect the weld pool while cooling
  2. melt the electrode end
  3. freeze the weld pool
  4. protect the hot gas cup
A

protect the weld pool while cooling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The GTAW process can be performed:

  1. with plastic filler rods
  2. without shielding gas
  3. without filler metal
  4. without electricity
A

without filler metal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what colour band ewould identify 2% thoriated tungsten?

  1. orange
  2. red
  3. yellow
  4. green
A

red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What unit of calibration is used for Flow Meters?

  1. PSI
  2. LPM/CFH
  3. FPM
  4. CFM/LPH
A

LPM/CFH

liters per minute or cubic feet per hour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is an Autogenous weld?

  1. a weld produced by an automated welder
  2. a weld that has a high degree of felxibility
  3. a weld produced without the use of a filler metal
  4. a weld produced by submerged arc welding
A

a weld produced without the use of a filler metal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

how would you reduce suck back on a root weld using GTAW?

  1. increase weld amperage
  2. change polarity
  3. increase purge pressure
  4. reduce weld amperage
A

reduce weld amperage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

A flow meter would be installed with the site glass in which postion?

  1. horizontal
  2. 4º to the vertical
  3. down
  4. upright
A

upright

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which tungsten would you expect to see balled after striking an arc?

  1. pure tugnsten using AC
  2. 2% thiriated using DC electrode negative
  3. 2% ceriated tugnsten using AC with a balance control of 60-70%
  4. any tungsten when excessive DC+ (positive) current is used
A

pure tugnsten using AC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why is argon used a a shielding and purging gas?

  1. Argon is lighter than air
  2. argon poses no health risk to the welder
  3. argon is heavier than air
  4. argon is a reactive gas and increases the arc temperature
A

argon is heavier than air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly