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WorksheetsGTAW Topic 1-6
Total questions: 12
Worksheet time: 6mins
What is an inert gas?
Inert gas reacts chemically with the molten weld puddle, adding needed oxygen to the environment
Inert gas is a form of oxygen, which helps the puddle cool down
Inert gas does not react chemically with the molten weld puddle, allowing the puddle to cool in an oxygen-free atmosphere.
Inert gas is another word for carbon dioxide
What does an autogenous weld mean?
The weld has the addition of filler metal
The weld is full of holes
The weld is made without the addition of filler metal
The weld is made by adding in tungsten to the puddle
Does GTAW use a consumable or non-consumable electrode?
Consumable
Non-consumable
GTAW was first called heli-arc welding. Why?
It was developed for helicopter repairs
It used to mainly use helium for shielding
It was developed by a helicopter pilot
Heli-arc was a GTAW machine manufacturer
Is GTAW constant current or constant voltage?
Constant current
Constant voltage
Why is tungsten used for GTAW electrodes?
Because it is rare
Because it doesn't conduct electricity
Because it has the highest melting point of any metal
Because it can be added to the base metal
What is the difference between direct current (DC) and alternating current (AC)?
Direct current travels in one direction and alternating current changes directions
Direct current is most efficient and alternating current takes more time
Direct current alternates direction and alternating current travels in one direction
Direct current stops the current and alternating current doesn't
What is the HAZ (Heat Affected Zone)?
Your welding booth
The area adjacent to the weld in the base metal
The atmosphere around your plate
Where your weld started
What color band is on a PURE tungsten?
Blue
Red
Orange
Green
How should the tip of the tungsten be prepared for DCEN welding?
Rounded
Tapered with a small flat
Square
Knurled
What type of current is most commonly used for GTAW because it focuses most of the welding heat in the workpiece?
AC
DC
CC
DCEN
What allows tungsten electrodes to form an arc without melting?
Low thermal conductivity
Heavy shielding gas
Mild radioactivity
High melting point
