Gtaw Flashcards by Martin H.

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This is a single square butt joint

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Single square butt with backing strip

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Double square butt

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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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Single bevel butt with backing strip

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Double j butt

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Single j butt with backing strip

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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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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

Study These Flashcards

A

Q

What is the thermal conductivity of aluminum?

Study These Flashcards

A

4x greater than steel

Q

Study These Flashcards

A

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

Cubic feet/ hr Liters per min

A large number of capacitors in series are used to overcome

An unbalanced sine wave

In ac

What is the recommended shad to use on non ferrous metals

11

Bevel angle for groove welds

30 - 37.5 degrees

Included angle for groove welds

60- 75 degrees

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

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

Tacks should be?

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

Why do you tack the ends from the back side

To ensure full fusion

How far is the stick out of the tungsten?

2x the electrode diameter

In the dip technique the filler rod is added ?

At the leading edge of the puddle

Fall through def

A localized area of excessive penetration

To reduce crater cracking when using tig

Use a tailing out procedure

Possible causes of suck back?

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

How do they usually do a stainless pipe tig test

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

Argon back purge flow rate

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

What is the 6g position

Done on a 45 degree axis with no rotation during welding

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

Prevents an updraft drawing air through the pipe causing contamination