GTAW Homework/study guide

Not keeping the tip of the filler metal in the flow of shielding gas will cause the tip of the filler to do what?

It will oxidize or become contaminated

Use the picture below to identify the 4 parts of the Fillet weld

A. Toe of the weld

B. Root of the weld

C. Leg of the Weld

D. Face of the weld

At what amperage should a water cooled torch be used?

over 200 amps

how long can you weld at max output with a 75% duty cycle welder?

7.5 minutes out of 10

what polarity will give the deepest penetration with TIG welding?

DCEN - Direct current electrode negative

what is the preferred filler recommended for welding 4130?

ER80S-D2

What are four types of gasses that can be used for TIG welding

A. Helium

B. Argon-Helium

C. Argon- Hydrogen

D. Argon

E. Hydrogen

F. Nitrogen

What do each of the letters indicate for AWS classification system for tungsten electrode EWZr?

E. Electrode

W. Tungsten

Zr. Zirconium oxide

What can cause your tungsten to turn blue after you have been welding with it?

Insufficient post-flow

A travel angle greater than 20 ゚ can cause what three things to happen?

A. Prematurely melts filler rod

B. Incomplete penetration

C. Undercutting or Lack of fusion

A brown color at the toe of the weld can be caused by what?

Oxidation

Why would you use helium when welding thicker pieces of aluminium ?

To increase penetration and travel speeds because it produces a hotter arc