Deck 15: Gas Tungsten Arc Welding Equipment and Materials

Question 1

A grinder is often used to clean a contaminated tungsten.

Answer 1

True

Question 2

The welding power supply is often called the ____.

A) TIG torch
B) welder
C) ground clamp
D) MSDS

Answer 2

B

Question 3

If tungsten is struck sharply, it will break without bending.

Answer 3

True

Question 4

____ is the time during which the gas continues flowing after the welding current has stopped.

A) Overflow
B) Postflow
C) Preflow
D) Inflow

Question 5

Helium is ____.

A) a by-product of the natural gas industry
B) heavier than air
C) much cheaper than argon
D) used with alternating current

Question 6

The longer a nozzle, the longer the tungsten must be extended from the ____.

A) welder
B) weld
C) collet
D) holder

Question 7

____ torches have three hoses connecting to the welding machine.

A) Air-cooled
B) Linde
C) Water-cooled
D) Welding

Question 8

High gas flow rates waste shielding gases.

Question 9

The cleaning action by electrons leaving the surface of the metal is most important when welding on ____.

A) copper
B) zinc
C) aluminum
D) lead

Question 10

Cerium oxide (CeO₂) is added to tungsten to improve the current-carrying capacity in the same manner as does ____.

A) titanium
B) aluminum
C) calcium
D) thorium

Question 11

Argon and helium are noble inert gases.

Question 12

One advantage of air-cooled GTAW torches is continuous operation without overheating.

Question 13

Preflow is the time during which gas flows to clear out any air in the nozzle or surrounding the weld zone.

Question 14

Nitrogen is used to increase surface tension when welding copper.

Question 15

The gas tungsten arc welding (GTAW) process is sometimes referred to as TEG.

Question 16

The advantages of water-cooled torches make them the preferred GTA welding torch type for most small shops.

Question 17

GTA welding is efficient for welding metals ranging from sheet metal up to 1/2 in.

Question 18

Helium has been mixed with ____ to gain the combined benefits of cathode cleaning and deeper penetration, particularly for manual welding.

A) hydrogen
B) argon
C) nitrogen
D) acetylene

Question 19

The time of postflow is determined by the welding current and the ____.

A) tungsten size
B) grain size
C) weld size
D) overall size

Question 20

Pure tungsten has ____ heat resistance and electron emission characteristic ____ all the tungsten electrodes.

A) the best, of
B) a similar, to
C) the same, as
D) the poorest, of

Question 21

Four major components make up a GTA welding station: the welding power supply, the welding torch, the work clamp, and the ____________________.

Question 22

The term TIG is short for tungsten ____________________ welding.

Question 23

The speed at which current changes back and forth is referred to by three different names that all mean the same thing-cycles, frequency, or ____________________.

Question 24

Air-cooled torches have just the shielding gas hose that needs to be connected to the welding machine or ____________________.

Question 25

The nozzle size, both length and ____________________, is often the welder's personal preference.