Power
Gases
Tungsten
GTAW Torch
Why Not
100
Preferred current for GTAW welding mild steel
DCEN
100
Recommended post flow time for welding at 200amps
20 secs
1 sec for every 10 amps
100
Yellow band on one end of tungsten
1% thoriated
100
This component ensures electrical contact between the torch body and the collet
Collet body
100
This metal requires back purging using GTAW
Stainless Steel
200
Power source used for GTAW
Constant Current
200
Units of measure on flowmeters
L/min and CFH
200
Red bad on one end of tungsten
2% thoriated
200
These are known as
Back caps
200
deoxidized filler rods are used for mild steel
control porosity
300
Type of current that promotes greater control over heat input
Pulsed
300
Preferred shielding gas for GTAW heavier gauge aluminum
Helium
300
Brown band on one end of tungsten
Zirconium
300
Component known as
Collet or Electrode Collet
300
Rule of thumb for estimating GTAW stickout
1 to 2 electrode diameters
400
Which half cycle is reduced using GTAW process on AC
DCEP
400
Shielding gas preferred for light gauge material
Argon
400
Blue band on one end of tungsten
EWTh-3
Pure tungsten and thorium
400
Component known as
Collet body
400
Amperage limit for air cooled GTAW torches
150A
500
DCEN with HF is used to provide
Non touch arc start
500
Excessive gas flow causes what GTAW defect typically and what is the correct flow rate for GTAW
Undercut
15 to 25 CFH
500
Most commonly used electrode for welding magnesium alloys
EWZr
500
Component know as
Gas lens
500
Maximum water pressure that should be used with water-cooled GTAW torches
245 to 280 kpa ( 35 to 40 psi)