Deck 23: Arc Cutting, Gouging, and Related Cutting Processes

Question 1

Most ____ operations use a pulsed laser because the cloud of vaporized material caused by the laser will diffuse a continuous laser beam.

A) oxygen lance cutting
B) laser beam cutting
C) laser beam drilling
D) laser beam welding

Answer 1

C

Question 2

Laser light tends to remain in a very tight beam without spreading out.

Answer 2

True

Question 3

Most laser welding and cutting operations use a solid state laser, and most drilling operations use a gas laser.

Answer 3

False

Question 4

Most lasers used for cutting, drilling, and welding produce a laser light beam in the ____ range.

A) radio wave
B) infrared
C) microwave
D) visible

Question 5

No other drilling process can match the precision, speed, or economy of the laser drill.

Question 6

High-powered solid lasers are most often used with a high-power continuous or low-powered pulse.

Question 7

Early lasers all used a synthetic ruby rod as the material that produced the laser light.

Question 8

Some laser cutting equipment can make cuts that are within ± a hundred thousandths of an inch, which is as accurate as some rough machining operations.

Question 9

Arc cutting electrodes differ from standard arc welding electrodes in that they burn back inside the outer flux covering, creating a small cavity.

Question 10

____ uses a high-pressure jet of gas to blow the molten or vaporized material out the bottom of the cut.

A) Laser beam cutting
B) Air carbon arc cutting
C) Oxygen lance cutting
D) Laser beam drilling

Question 11

____ gases do not add any heat to the laser beam cutting process; they simply remove the material by blowing it out of the kerf.

A) Reactive
B) Exothermic
C) Nonreactive
D) Endothermic

Question 12

____ was an improvement of the carbon arc process.

A) Air carbon arc cutting
B) Oxygen lance cutting
C) Laser beam cutting
D) Laser beam welding

Question 13

A(n) ____ process uses a consumable alloy tube.

A) air carbon arc cutting
B) oxygen lance cutting
C) laser beam cutting
D) laser beam welding

Question 14

____ is used to remove defective welds and to prepare a thick metal joint so that a full penetration weld can be made.

A) Washing
B) Gouging
C) U-grooving
D) Water jet cutting

Question 15

The power density of a cutting laser can be equal to ____ million watts per square inch.

A) 15
B) 25
C) 30
D) 65

Question 16

The highest continuous power output-type lasers are the gas type with a blower to circulate the gas through a heat exchanger; they can be rapidly pulsed to improve their cutting capacity.

Question 17

____ is the most common application of the air carbon arc cutting processes.

A) J-grooving
B) U-grooving
C) Washing
D) Gouging

Question 18

____ gases in the laser beam cutting process react with the material being cut like an oxyfuel cutting torch.

A) Endothermic
B) Nonreactive
C) Reactive
D) Exothermic

Question 19

The gas laser is capable of generating the highest-powered laser pulses.

Question 20

High-powered solid lasers have a problem because the internal temperatures of the laser rod decrease with operation time.

Question 21

____________________ is a synthetic crystal that when exposed to the intense light from the flash tubes can produce high quantities of laser energy.

Question 22

____________________ is the process sometimes used to remove large areas of metal so that hard surfacing can be applied.

Question 23

In water jet cutting, ____________________ are added when hard materials such as metals are being cut.

Question 24

____________________ cutting does not put any heat into the material being cut, and it is this lack of heat input that makes this process unique.

Question 25

Through ____________________ cutting, it is possible to make very close parallel cuts without damaging the strip that is cut out.