Gtaw Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q
A

This is a single square butt joint

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2
Q
A

Single square butt with backing strip

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3
Q
A

Double square butt

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4
Q
A

Single v butt

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5
Q
A

Double bevel butt

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6
Q
A

Single bevel butt with backing strip

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7
Q
A

Single bevel butt with backing strip

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8
Q
A

Double j butt

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9
Q
A

Single j butt with backing strip

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10
Q
A

Single j butt

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11
Q
A

Double u butt

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12
Q
A

Single u butt with backing strip

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13
Q
A

Single u butt

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14
Q
A

Double v butt

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15
Q
A

Single v butt with backing strip

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16
Q
A

Single v butt

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17
Q
A
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18
Q
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19
Q
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20
Q
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21
Q

Why is it common practice to leave 25 psi in a cylinder

A
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22
Q
A
23
Q

What is the thermal conductivity of aluminum?

A

4x greater than steel

24
Q
A
25
Q
A
26
Q
A
27
Q

Flow meters are calibrated in:
- /hr?
-/min?

A

Cubic feet/ hr
Liters per min

28
Q
A
29
Q
A
30
Q
A
31
Q
A
32
Q

A large number of capacitors in series are used to overcome

A

An unbalanced sine wave

33
Q
A
34
Q
A
35
Q
A
36
Q

In ac

A
37
Q

What is the recommended shad to use on non ferrous metals

A

11

38
Q
A
39
Q
A
40
Q

Bevel angle for groove welds

A

30 - 37.5 degrees

41
Q

Included angle for groove welds

A

60- 75 degrees

42
Q

At what thickness on a groove weld do you prepare a land?
How big is it?

A

-4.8 mm or 3/16
- 1.6 mm or 1/16

43
Q

Tacks should be?

A

1/4 to 3/8 ( no longer than the thickness of the material)

44
Q

Why do you tack the ends from the back side

A

To ensure full fusion

45
Q

How far is the stick out of the tungsten?

A

2x the electrode diameter

46
Q

In the dip technique the filler rod is added ?

A

At the leading edge of the puddle

47
Q

Fall through def

A

A localized area of excessive penetration

48
Q

To reduce crater cracking when using tig

A

Use a tailing out procedure

49
Q

Possible causes of suck back?

A
  • current to high
    -travel speed too slow
    -excessive arc length
  • failure to add filler rod deep enough into the back side
50
Q

How do they usually do a stainless pipe tig test

A

Due to cost it is usually mild steel with a stainless filler rod

51
Q

Argon back purge flow rate

A

-2.8-4.5 l/min for 2 to 3 minutes
-1.4 l/min until 2nd layer is complete

52
Q

What is the 6g position

A

Done on a 45 degree axis with no rotation during welding

53
Q

Why would you blank the bottom of the joint during 6 g?

A

Prevents an updraft drawing air through the pipe causing contamination