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GTAW

True/False
Indicate whether the statement is true or false.
 

 1. 

Filler metals for GTAW use the same classification as filler metals used for GMAW.
 

 2. 

Filler metal is necessary on all welds made with the GTAW process.
 

 3. 

DCEP allows deeper penetration than DCEN.
 

 4. 

A remote current control allows the welder to adjust current while welding.
 

 5. 

Postflow is the amount of time the shielding gas continues to flow after the arc is extinguished.
 

 6. 

The chemical symbol for tungsten is W.
 

 7. 

When welding with DCEN, the electrode is positive and the work is negative.
 

 8. 

Alloyed tungsten electrodes last longer and have a higher current capacity than pure tungsten electrodes.
 

 9. 

For thin materials, the diameter of the filler metal should equal the thickness of the metal to be welded, or slightly smaller.
 

 10. 

The addition of helium to argon shielding gas improves penetration.
 

 11. 

One method of adding filler metal to the weld is to use the dip technique with an in-and-out motion.
 

 12. 

When using a scratch start, the electrode is withdrawn quickly from the base metal after the arc is struck.
 

 13. 

When welding a lap joint, filler should be added when the weld pool forms a V-shaped notch.
 

 14. 

Downhill welding is preferred for welding with GTAW in the vertical position.
 

 15. 

On thin-gauge metals sensitive to atmospheric contamination, a backing bar is used to protect the root side of the weld.
 

 16. 

When using HF start current, the electrode does not touch the workpiece when starting the arc.
 

 17. 

In the semiautomatic process, the torch is controlled automatically while the operator feeds the filler metal into the weld pool.
 

 18. 

T-joints on thin metals can be welded with or without filler metal.
 

 19. 

The electrode should be bent slightly for welding corner joints and lap joints.
 

 20. 

In hot wire welding, filler metal is automatically fed from a wire feeder.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 21. 

Inverters equipped with ___ can use tapered electrodes for welding with AC.
a.
high frequency
b.
slope controls
c.
frequency controls
d.
amplitude controls
 

 22. 

___ provides deeper penetration than ___ when using GTAW.
a.
AC; DC
b.
DCEP; DCEN
c.
DCEN; DCEP
d.
DCEP; AC
 

 23. 

When welding using alternating current, DCEP provides good ___ and DCEN provides good ___.
a.
cleaning action; penetration
b.
penetration; cleaning action
c.
arc starting; cleaning action
d.
penetration; arc starting
 

 24. 

___ time is the period of time the shielding gas continues to flow after the arc is stopped.
a.
Flow
b.
Postflow
c.
Dwell
d.
none of the above
 

 25. 

A ___ end on the electrode is typically used when welding with alternating current.
a.
tapered
b.
hemispherical
c.
square
d.
none of the above
 

 26. 

Of the shielding gases used for GTAW, ___ allows the deepest penetration.
a.
carbon dioxide
b.
argon
c.
helium
d.
nitrogen
 

 27. 

___ is another name for GTAW.
a.
TIG
b.
IGT
c.
DCEP
d.
DCEN
 

 28. 

___ is rarely used in GTAW.
a.
High frequency
b.
AC
c.
DCEP
d.
DCEN
 

 29. 

The most commonly used shielding gas is ___.
a.
boron
b.
nitrogen
c.
hydrogen
d.
argon
 

 30. 

The ___ is determined by the current to be used and the thickness of the base metal.
a.
postflow
b.
shielding arc
c.
filler metal
d.
flowmeter
 

 31. 

When depositing beads on mild steel using GTAW, ___.
a.
1/8² to 3/16² stickout is required
b.
current is set for 80 A to 95 A
c.
a 20° push angle is used
d.
all of the above
 

 32. 

In the ___ process of application, the weld operation is done by hand.
a.
automatic
b.
semiautomatic
c.
mechanized
d.
manual
 

 33. 

A(n) ___° work angle is required when welding a T-joint in horizontal position.
a.
30
b.
45
c.
80 to 85
d.
90
 

 34. 

Filler metal should be held at a ___° to ___° angle above the surface of the work when welding a butt joint.
a.
5; 10
b.
10; 15
c.
15; 20
d.
20; 30
 

 35. 

For butt joints on thin-gauge metals sensitive to atmospheric contamination, ___ are used to protect the root side of the weld.
a.
backing bars
b.
heat sinks
c.
HAZs
d.
oils
 

 36. 

In the ___ technique, filler metal is held in the joint with a slight downward pressure as the torch is moved with a steady push.
a.
dip
b.
downward
c.
lay-wire
d.
push
 

 37. 

Pulsed GTAW uses ___ level(s) of welding current.
a.
one
b.
two
c.
three
d.
four
 

 38. 

When welding a T-joint, ___ is required regardless of the thickness of the metal.
a.
filler metal
b.
alternating current
c.
long arc length
d.
undercurrent
 

 39. 

A ___ motion is used with the torch when depositing beads with filler metal.
a.
vertical
b.
wide horizontal
c.
small circular
d.
large hemispherical
 

 40. 

The length of time that peak current is maintained before it drops to background current is ___.
a.
percent ON time
b.
pulse per second
c.
heat input
d.
peak current
 



 
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