Chapter 22 GTAW Flashcards
What is out-of-position welding?
Welding in a position other than flat
What causes a weld bead to sag and not properly fill a joint in out-of-position welding?
gravity pushes the molten weld pool down.
What travel angle and work angle is used to weld a horizontal fillet weld?
travel angle: 15-30°
work angle: 45°
In a horizontal fillet weld, the torch is centered over the ___________
root of the weld but pointed more toward the vertical piece
Where is filler metal added to a horizontal fillet weld?
To the upper leading edge of the weld pool
When making a fillet weld in any position, a ___ weld pool is used
c-chaped
Why is a c-shaped weld pool used in any position while making a fillet weld?
It shows that both pieces are melting similar to welding in a flat position.
What should the face of a completed fillet weld look like?
It should be flat or slightly convex
How do you reduce undercut and underfill in a butt weld?
By adding filler metal on top of the weld pool
In a butt weld, the welding rod is held _________° above the axis of the weld.
15° - 20°
the welding rod is added to the front upper part of the weld pool
When welding downhill, the electrode is held in line with the weld axis with a _____ travel angle.
15° - 20°
It may be added from the top or side
How When welding in the vertical position with GTAW, thicker metals are welded with the weld pool moving from ______________
the bottom of the joint towards the top. this is also known as uphill (vertically up) welding.
Thin metals (1/16” or thinner) are welded using ________ welding.
downhill (vertically down)
When welding downhill, the filler metal is added to the ___________
trailing edge, which is the top of the weld pool, or the side of the weld pool.
Welding current for overhead welding can be reduced ______A, depending on the base metal thickness.
10-20A
10A less for thin metals on overhead than for flat welding
20A less for thick metals
Why reduce the current or use pulsed current for overhead welding?
To keep the weld pool smaller than for flat welding.
Shielding gas flow rates must be _____ for overhead welding.
higher
Why must shielding gas flow rates be higher for overhead welding?
Because argon is heavier than than air. To compensate, flow rates are increased.
How much should shielding gas flow rates be increased when working overhead?
by 3-5 cfh (2-3 Lpm) for thin metals
5 cfh (3 LPM) on metals 3/16” or thicker
What should you do if you get porosity when welding overhead?
Check to make sure you are keeping the correct arc length. If it is correct, increase the shielding gas flow.
___________ and ___________ are meat very commonly welded with GTAW.
Stainless steel and aluminum
_____________ GTAW can be used to make quality welds in all out-of-position weld joints.
pulsed
________ is not radioactive material. It may be used as a replacement for ___________ electrodes where low level radiation is a concern.
Ceria
thoriated
A CSA low carbon steel filler metal classification for GTAW is:
a. ER347
b. ER4043
c. ER5356
d. ER49S-2
d. ER49S-2
The designation ER347 indicates
an autenistic stainless steel filler metal
