The GTAW Process Flashcards
Define the term GTAW
Gas tungsten arc welding
Process in which fusion welding is accomplished by the heat of an electric arc drawn between a non consumable tungsten electrode and the work.
With GTAW the heat of the arc is transferred to the work through non consumable
Tungsten electrode
GTAW requires an inert gas to
Shield the weld puddle
GTAW is used primarily when
High quality welds are mandatory
For what application would hot wire GTAW be used
Where high production welds are required
State the major difference between hot wire GTAW and cold wire GTAW
Hot wire GTAW has the wire preheated with an auxiliary AC current prior to the wire entering the weld pool, where as the cold wire process feeds wire that is at ambient temp and without an auxiliary power source attached
In what positions can the GTAW process be used
All positions
Which metal requires a full preheat when welded with the GTAE process
Cast iron
GTAW has an advantage over SMAW because it
Can eliminate the need to use a flux
The intensity of the ultraviolet light produced by the GTAW process is like ……. Metal arc welding, but is much greater than that produced by the ……. Metal arc welding process
Gas metal arc welding
Shielded metal arc welding
When welding with GTAW you should wear
Dark coloured tightly woven clothing
When using GTAW good ventilation is required to prevent
An oxygen deficiency
The arc radiation from GTAW reacts with elements in atmospheric air to form
O3 (ozone)
Ultraviolet radiation from GTAW can react with chlorinated degreasing solvents to produce
Phosgene gas
Pulsing the arc with GTAW is an advantage when
Penetration on thin metals must be controlled
