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Welding Level 2 > Chapter 16 GTAW and FCAW > Flashcards

Chapter 16 GTAW and FCAW Flashcards

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1
Q

___________________ rolls are used for solid GMAW electrodes and some metal cored applications.

A

smooth v-groove

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2
Q

_______________ rolls are used for flux cored and some metal cored electrodes.

A

knurled v-groove

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3
Q

______________ rolls have ridges in the groove to grip and push the electrode wire.

A

knurled

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4
Q

Aluminum wire is fed with __________ rolls

A

smooth u-groove

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5
Q

The wire feeder is the same for all electrodes but the __________ are changed based on the type of the electrode wire.

A

drive rolls

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6
Q

When the electrode diameter changes, the _____________ must also be changed.

A

drive rolls

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7
Q

In FCAW, what should you do if the wire exiting the gun is crushed or deformed?

A

That means the pressure is too high. Reduce the pressure and check again.

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8
Q

When the wire in the feeder becomes tangled it produces a _____________.

A

bird’s nest

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9
Q

How do you remove a bird’s nest?

A

By raising the pressure roll and cutting the wire on both sides of the bird’s nest

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10
Q

What part of the welding gun need to be replaced most often?

A

The contact tube

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11
Q

How is the contact tube replaced?

A

Select the correct size contact tube for the diameter of electrode you will use. The contact tube is threaded into the adapter or diffuser.

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12
Q

The hole in the center of the contact tube will get _______ due to wear.

A

larger

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13
Q

________ hours of constant welding with a steel electrode will wear a contact tube enough that it will need to be replaced.

A

eight

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14
Q

What does the AWS GMAW designation E mean?

A

E stands for electrode
It means a filler material can be used as an electrode

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15
Q

What does the AWS GMAW designation R mean?

A

R stands for rod

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16
Q

In the AWS designation, after the E and R the next set of numbers is the ________ of the weld wire after welding.

A

tensile strength

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17
Q

The tensile strength is measured in _________

A

thousands of pounds per square inch

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18
Q

Typical value in the electrode designation for carbon steel electrodes are ____ and _____

A

70 and 80 which represents
70,000 and 80, 000 psi

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19
Q

High-strength steels may require electrodes with tensile strengths of ______

A

90, 100, 110 or more

20
Q

In the AWS designation for GMAW, after the E, R and tensile strength comes a letter, either ____ or ____.

A

S or C

21
Q

What does the AWS GMAW designation S mean?

A

Identifies the material as a solid electrode wire

22
Q

What does the AWS GMAW designation C mean?

A

Identifies the material as a metal cored electrode.

23
Q

What does the AWS designation for FCAW, what does T mean?

A

Tubular electrode

24
Q

Carbon steel electrodes from GMAW are given different dash numbers to identify their varying compositions. A common GMAW electrode for carbon steel is _________

A

ER70S-6

25
Q

FCAW electrodes have a dash number which indicates which three pieces of information about the electrode?

A
  1. The polarity to use
  2. The shielding gas to use, if required
  3. Whether the electrode can be used for multiple-pass welds.
26
Q

What is a dash number?

A

Numerals or letters at the end of the electrode designation, following a dash.

27
Q

The tension adjusting knob should be adjusted to apply the _____________ pressure needed to properly feed the electrode wire.

A

minimum

28
Q

True or False: It is important not to crush flux cored wires.

A

True

29
Q

Common GMAW and cored electrode diameters range from ___________

A

0.030” to 1/16” (0.8 mm to 1.6 mm)

30
Q

Common FCAW electrodes range from _________

A

0.045” to 1/16” (1.2 mm to 1.6 mm)

31
Q

soft electrodes such as _______________ and ________________ electrodes cannot be pushed through a welding cable as far as a large-diameter electrode.

A

aluminum and magnesium

32
Q

There are two settings on the welding machine which must be adjusted. What are they?

A
  1. voltage
  2. wire feed speed

The metal transfer method is set by these two variables and the shielding gas selected.

33
Q

What does adjusting the voltage and wire feed speed do?

A

determines the arc length and current

34
Q

What should the wire speed setting be for a carbon or low-alloy steel 0.035” electrode using short circuiting transfer?

A

160-380 in/min (4.1 - 9.7 M/min)

35
Q

What should the voltage setting be for a carbon or low-alloy steel 0.035” electrode using short circuiting transfer?

A

16-22 V

36
Q

What should the wire speed setting be for a carbon or low-alloy steel 0.035” electrode using spray transfer?

A

360-520 in/min ( 9.1 - 13.2 M/min)

37
Q

What should the current setting be for a carbon or low-alloy steel 0.035” electrode using spray transfer?

A

24-28 V

38
Q

Flux cored electrodes are designed for one of two position groupings. They may be designed to be used in the flat position to make __________________ or they may be designed to ______________

A

horizontal fillet welds
weld in all positions

39
Q

Electrodes for FCAW used for welding in flat positions and horizontal fillet welds are designated by a _____. Those used for welding in all positions are designated by a _____. These are followed by the letter ____

A

0
1
T

40
Q

The electrode E70T-X is for use in which position?

A

Flat or horizontal fillet weld

41
Q

The electrode E81T-X is for use in which position?

A

All positions

42
Q

Gas-shielded flux cored electrodes can be designed to work with 100% ____ or with an _________ mixture.

A

CO2
argon-CO2

43
Q

To identify which type of shielding gas is to be used with the electrode, a ____ is added to the designation for CO2 and a _____ is added for mixed gas.

A

C
M

44
Q

Which type of shielding gas should be used with the electrode E71T-1C

A

CO2

45
Q

Which type of shielding gas should be used with the electrode E71T-1M

A

Mixed gas

46
Q

When a single electrode can be used with either shielding gas, it is identified with _____________

A

Both designations C and M
For example E71T-1M and E71T-1C

47
Q

How many drive rolls are in a FCAW?

A

Wire feeders use a 2 roll drive system which works well with welding rolls up to 15 feet long. A 4 roll drive system is used for up to 25 feet.

Welding Level 2 (21 decks)

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