GTAW

Question 1

GTAW requires ________ to shield the weld puddle

Answer 1

An inert gas

Question 2

When is GTAW primarily used?

Answer 2

When high quality welds are mandatory

Question 3

When is hot wire GTAW used?

Answer 3

When high production welds are required

Question 4

What positions can the GTAW process be used?

Answer 4

Flat, horizontal and vertical

Question 5

Which metal requires a full preheat when welded with the GTAW process?

Answer 5

Cast Iron

Question 6

What is an advantage of GTAW over SMAW?

Answer 6

It can eliminate the need to use a flux

Question 7

The intensity of the uv light produced by the GTAW process is similar to __________ welding

Answer 7

gas metal arc

Question 8

The intensity of the uv light produced by the GTAW process is much greater than that produced by ______________ welding

Answer 8

Shielded metal arc welding

Question 9

When using GTAW, good ventilation is required to prevent _______

Answer 9

An oxygen deficiency

Question 10

The arc radiation from GTAW reacts with elements in atmospheric air to form _______

Answer 10

Ozone (O3)

Question 11

Ultraviolet radiation from GTAW can react with chlorinated degreasing solvents to produce _____

Answer 11

Phosgene gas

Question 12

Pulsing the arc with GTAW is an advantage

Answer 12

penetration on thin metals must be controlled

Question 13

Welding machines designed for GTAW are ______

Answer 13

Constant current (CC)

Question 14

An AC/DC _______ would be best suited for GTAW.

Answer 14

rectifier

Question 15

Power sources recommended for GTAW have a _______volt-amp curve

Answer 15

drooping

Question 16

What is post-purge control designed to do?

Answer 16

Keep gas flowing for a pre-set time after the arc is extinguished

Question 17

When using 125 amperes on an AC current _______ is the recommended size of electrode.

Answer 17

2.5 mm or 3/32 inch

Question 18

What is the recommended current type for welding stainless steel?

Answer 18

DC electrode negative

Question 19

Which current type produces the deepest penetration?

Answer 19

Direct Current electrode negative

Question 20

Removal of aluminum oxide occurs during __________

Answer 20

The positive half of the AC cycle

Question 21

AC high frequency is most suited for GTAW on ________ and _________

Answer 21

aluminum and magnesium

Question 22

Continuous high frequency current is required when ________

Answer 22

A stabilized AC current is required

Question 23

A GTAW torch that is too small for the current setting overheats the __________

Answer 23

Torch body

Question 24

A torch cap is the part of a GTAW torch that _________

Answer 24

Protects the electrode from accidental arc strikes

Question 25

What do the sealing surfaces between the cap and the torch body of a GTAW torch provide?

Answer 25

Shielding gas seal

Question 26

What torch part serves the primary purpose of binding the collet onto the electrode?

Answer 26

A torch cap

Question 27

A collet is a device in the GTAW torch that _________

Answer 27

Positions the electrode and transfers current

Question 28

The diameter of the nozzle is normally determines by

Answer 28

The size of the puddle and the electrode

Question 29

To use continuous high frequency current, the nozzle must be constructed of __________

Answer 29

Ceramic

Question 30

What is the purpose of a regulator when used with GTAW?

Answer 30

To reduce supply pressure to a safe working pressure

Question 31

Which unit it a flowmeter calibrated in?

Answer 31

liters per minute or cubic feet per hour

Question 32

What is the purpose of a flowmeter when used with GTAW?

Answer 32

to meter the flow of shielding gas

Question 33

A floating ball type flowmeter must be used in the ________ position

Answer 33

Veritical