Gtaw Flashcards by Martin H. | Brainscape

Q

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This is a single square butt joint

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Q

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Single square butt with backing strip

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Double square butt

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Q

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Single v butt

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Double bevel butt

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Single bevel butt with backing strip

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Q

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Single bevel butt with backing strip

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Q

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Double j butt

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Single j butt with backing strip

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Q

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Single j butt

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Double u butt

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Single u butt with backing strip

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Q

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Single u butt

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Q

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Double v butt

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Q

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Single v butt with backing strip

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Q

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Single v butt

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Q

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

A

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Q

What is the thermal conductivity of aluminum?

A

4x greater than steel

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Q

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

A

Cubic feet/ hr
Liters per min

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Q

A large number of capacitors in series are used to overcome

A

An unbalanced sine wave

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Q

In ac

A

Q

What is the recommended shad to use on non ferrous metals

A

11

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Q

Bevel angle for groove welds

A

30 - 37.5 degrees

Q

Included angle for groove welds

A

60- 75 degrees

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

Q

Tacks should be?

A

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

Q

Why do you tack the ends from the back side

A

To ensure full fusion

Q

How far is the stick out of the tungsten?

A

2x the electrode diameter

Q

In the dip technique the filler rod is added ?

A

At the leading edge of the puddle

Q

Fall through def

A

A localized area of excessive penetration

Q

To reduce crater cracking when using tig

A

Use a tailing out procedure

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

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

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

Q

What is the 6g position

A

Done on a 45 degree axis with no rotation during welding

Q

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

A

Prevents an updraft drawing air through the pipe causing contamination