Tig Flashcards
Aluminum
Porosity is caused by…
Hydrogen
Designed for welding light gauge metals where low current values are used
Air-cooled torches
Basic diameters for electrodes are…
0.040; 1/16” ; 3/32” ; 1/8”
Provides directional control for the shielding gas and are threaded onto the collet body
Gas nozzles
Requires an electrode that’s 4times larger in diameter than that would be used for DCSP at a given amperage.
DCRP
- Recommended when welding requires amperages over 200amps.
- a circulating stream of water flows inside the torch to keep it cool.
Water-cooled torches
______&_____ can be used to weld non-ferrous & ferrous metals
DCSP & DCRP
Achieved by generating an electric arc between the tungsten electrode and base metal
Fusion
_______ can only be used to weld non-ferrous metals
AC
Weld puddle is deeper and more narrower than with DCRP
DCSP
The diameter of the filler rod should be
Same thickness of the metal being welded
The electrode is held into the torch by
Collet
Used to prevent air from being pulled into the gas stream
Gas Lensing
Used a ________ end when AC welding
Spherical (balled)
Used a _________ point with DC welding.
Sharp point
Electrodes may be either ______ or a _________.
Pure tungsten or a tungsten alloy
You should use ______ or _____ polarity when TIG welding stainless steel.
DCeN or ACHF
When welding without filler rod, you must pre-heat the metal to a range of _____-____ to prevent cracking in the weld
350-500
Aluminum
Dross is caused by…
Oxygen
Combination do DCSP & DCRP meaning one half of the AC cycle is DCSP and the other half is DCRP
ACHF
TIG can be used on..
Wide variety of light gauge commercial metals up to 1/4”
Welding process in which shielding gas protects the arc between a tungsten electrode and the base metal..
Tungsten inert gas
Welding process in which shielding gas protects the arc between a tungsten electrode and the base metal
Tungsten inert gas
TIG uses a unit supply that produces ____ & _______ & _____.
AC , DCSP, DCRP
_____ used for nonferrous metals.
AC
Used for nonferrous an ferrous metals
DCSP and DCRP
TIG uses what type of electrode..
Non-consumable metallic
TIG can be used on a wide variety of light gauge metals, nod commercial metals up to ___”
1/4
TIG welding is commonly used for joining metals in…
The aerospace and aircraft industries
Polarity that produces wide and shallow welds…
DCRP
Polarity that produces deep and narrow welds
DCSP
Polarity that’s a combination of DCSP and DCRP…
ACHF
Torch used for light gauge metals….
Air cooled
Torch used when welding requires amperages over 200amps
Water cooled
______ provides directional control for the shielding gas.
Gas nozzles
Electrode and filler rod sizes
0.040” , 1/16” , 3/32” , 1/8”
Electrodes may be…..
Pure tungsten or alloyed tungsten.
2% thorium is used for….
Aircraft & missiles
1% thorium is used to…
To weld steel.
Sharp point electrode…
DC welding machine
Spherical shaped electrode…
AC welding machine
The filler rod diameter should be….
The same as the metal thickness
Shielding gases can be….
Argon or helium or a mixture of the two.
Most popular shielding gas supplied in 300cuft at 200 psi
Argon
Rarely used more expensive of the 2 shielding gases in TIG
Helium
Flow meter calibration is measure in…
(cfh) cubic feet per hour, (lpm) liters per minute
Electrode used for aluminum…
Pure tungsten
Electrode used for steels..
1% or 2% thorium
Wire stick out for butt joints
1/8”-3/16”
Wire stick out for fillet joints..
1/4”-3/8”
High frequency should be set to ______ for steels
Start position
Hugh frequency should be set to _______ for aluminum..
Continuous
If a filler rod is used it should be added every ____.
1/4”
Preheat stainless steel to ____-____ to prevent the metal from cooling to quickly..
350-500 degrees
________ & __________ is controlled by a switch on the torch body or a foot pedal.
Current & gas flow
Produces a cleaning action that removes heavy oxide coating on metals
DCRP
Deep and narrow welds
DCSP
