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Welding Level 2 > Chapter 20 GTAW > Flashcards

Chapter 20 GTAW Flashcards

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1
Q

How should cylinders containing compressed gas be secured?

A

They should be secured to a wall, column, welding cart or welding hand truck with chains or steel bands.

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2
Q

If a ball float-type flowmeter is used, the flowmeter must be _____________

A

In a vertical position

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3
Q

What part of the torch must be loosened before adjusting the electrode extension?

A

Endcap or tailend

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4
Q

What is the recommended extension beyond the gas nozzle for welding a butt joint?

A

1/8”-3/16” max
3mm - 5mm

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5
Q

What is considered when selecting the weld current?

A
  1. What type of metal to be welded
  2. How thick is the metal
  3. What type of joint will be used
  4. In what position will welding be done
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6
Q

High frequency voltage is always used with which type of electrical current?

A

For AC welding you must use continuous high frequency voltage

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7
Q

What position is the contactor switch set for GTAW to use a foot pedal to turn on the welding current?

A

In the remote position, the current can be changed while welding by pressing a foot pedal or thumb switch.

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8
Q

If you want to set the current to a certian amount and not vary it during welding, what position should it be in?

A

To set a specific amount, the current remote switch is placed in the panel position.

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9
Q

Flowmeters use a ______ or adjusting ________ to control gas flow.

A

knob/ screw

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10
Q

How do you read a flowmeter

A

some flowmeters have a gauge to indicate the gas flow. The most common type has a ball float in a clear tube, which is read from the top of the ball.

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11
Q

How do you calculate how much postflow to use?

A

You divide the amps by 10

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12
Q

If you are using 100 amps, how much postflow should you have?

A

100 amps divided by 10 = 10 seconds

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13
Q

What is a characteristic of a pure tungsten electrode?

A

Forms a ball on the end when heated

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14
Q

What are the three characteristics of Zirconia tungsten electrodes?

A
  1. Similar to pure tungsten but with easier arc setting abilities
  2. Carries the same current are the thoria tungsten
  3. Used only for AC welding
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15
Q

zirconia tungsten electrodes are recommended only for ____________ welding

A

AC welding

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16
Q

Thoria and ceria tungsten electrodes are most common for _________ welding.

A

DC welding

17
Q

__________ and __________ tungsten electrodes are normally used for welding steel and stainless steel.

A

thoria and ceria

18
Q

Each tungsten electrode type is given classification by the AWS. In this system, the E stands for ____________.

A

electrode

19
Q

Each tungsten electrode type is given classification by the AWS. In this system, the W stands for ____________.

A

tungsten

20
Q

Each tungsten electrode type is given classification by the AWS. In this system, the P stands for ____________.

A

pure

21
Q

Each tungsten electrode type is given classification by the AWS. In this system, the Th stands for ____________.

A

contains thoria

22
Q

Each tungsten electrode type is given classification by the AWS. In this system, the Zr stands for ____________.

A

contains zirconia

23
Q

Each tungsten electrode type is given classification by the AWS. In this system, the Ce stands for ____________.

A

contains ceria

24
Q

Each tungsten electrode type is given classification by the AWS. In this system, the La stands for ____________.

A

contains lanthana

25
Q

What colour is pure tungsten and what is its AWS classification?

A

green and EWP

26
Q

What colour is 2% ceria and what is its AWS classification?

A

grey and EWCe-2

27
Q

What colour is 1% lanthana and what is its AWS classification?

A

Black and EWLa-1

28
Q

What colour is 1% thoria and what is its AWS classification?

A

Yellow and EWTh-1

29
Q

What colour is 2% thoria and what is its AWS classification?

A

Red and EWTh-2

30
Q

What colour is zirconia and what is its AWS classification?

A

Brown and EWZr-1

31
Q

What are the most common diameters of tungsten electrodes?

A

0.040” (1.0 mm) to 3/16” (4.8mm)

32
Q

What shape should the electrode tip used for DCEN welding have?

A

Tapered with a blunted tip.
in DC welding, grind electrode to a point then griding marks on the electrode should run lengthwise.

33
Q

What type of current is used to form a ball on the end of tungsten electrode?

A

For AC welding, the electrode tip is formed into a ball. This is done by striking an arc on a piece of steel or copper with AC or DCEP current.

34
Q

Which of the following is a filler metal used to weld nickel?
a. ER4043
b. ERZr-2
c. ER308L
d. ERNiCr-3

A

d. ERNiCr-3

35
Q

What type of electrical current is recommended for welding high carbon steels?

A

DCEN

Welding Level 2 (21 decks)

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