Weld 101- 101 J

Front 1

Plasma are cutting cuts all metals that conduct electricity ?true or false

Back 1

True

Front 2

You can use plasma or cutting and carbon arc gouging processes for weld metal removal and to cut most Ferrous and nonferrous metals? True or false

Back 2

True

Front 3

PAC stands for ?

Back 3

Plasma arc cutting

Front 4

What is an arc cutting process process that uses a constricted arc to remove molten metal with a high velocity jet of ionized gas flowing through a constricted nozzle?

Back 4

Plasma arc cutting.

Front 5

An AC current with an operating frequency of 1000 cycles per second.

High frequency current uses several thousand volts and only a fraction of an ampere superimposed onto the secondary circuit and is used initiate the pilot arc. Is ?

A. High frequency current

B. IOn

C. Plasma.

Back 5

A. High frequency current.

Front 6

An atom, Molecule that has either gained or lost one or more electrons is ?

A. Plasma.

B. Non transferred arc.

C stand off distance.

D. Ion.

Back 6

D. Ion

Front 7

An Arc established between the electrode and the torch tip. it does not transfer it to the work piece. Is ?

A. Non transferred arc

B. Pilot arc

C. Transferred arc

Back 7

A. Non transferred arc

Front 8

Low current high-voltage arc established between the electrode in the torch tip. The _____ arc is used to establish a pathway to initiate the main cutting arc ?

A. Non transferred arc

B. Pilot arc.

D. Transferred arc.

Back 8

B. Pilot arc.

Front 9

A gas that has been heated to an extremely high temp by an electric arc. This causes the gas to ionize, making it electrically conductive. It is considered to be the fourth state of matter, the other are gas, liquid and solid. Is ?

A. Ion

B. Pilot arc

C. Plasma.

Back 9

C. Plasma.

Front 10

The distance between the torch nozzle and the work is called the ____ distance?

Back 10

Stand off

Front 11

The current flow between the electrode in the torch in the work piece is called?

A. Pilot arc.

B. Non transferred arc

C. Transferred arc.

Back 11

C. Transferred arc.

Front 12

Temperature is producing a plasma arc stream range from ?

A. 5000-8000f

B. 10,000-11,000f

C. 18,000-25,00 f

Back 12

C.

Front 13

The PAC is an a Rosian process that operates on ____?

Back 13

DCSP

Direct current straight polarity.

Front 14

Pros of PAC ?

A. Very clean cuts.

B. Little slag.

C. Minimum HAZ zone.

D. All of the above.

Back 14

D. All of the above.

Front 15

Hazards from PAC ?

A. Electrical shock.

B. Fumes.

C. Noise.

D. Radiation.

E. Gases.

F. All of the above.

Back 15

F. All of the above.

Front 16

The operating range for PAC power source is 120- ____ volts

A. 400.

B. 200

C. 300

Back 16

A. 400

Front 17

PAC fine particulars are small and easily absorbed through the body which can be carcinogenic and can lead to other health problems ? True or false

Back 17

True

Front 18

Chlorinated solvents break down to form toxic ____ gas when they contact ultraviolet light emitted from a PAC ?

Back 18

Phosgene gas

Front 19

PAC emits intense ultraviolet , undated and visible lights ray. Use shade #8 for less then 300 amps and up to shade #14 for up to 800,amps. If these are not used what can it cause ?

A. Cataracts

B. Blindness.

C. Skin cancer.

D. All of the above

Back 19

D. All of the above.

Front 20

Hydrogen , when used as a plasma or secondary gas can cause ___ ?

Back 20

Explosions.

Front 21

What should the stand-off distance for PAC be ?

Back 21

6.4mm - 10mm

Front 22

_____ is a re solidified oxidized molten metal ?

Back 22

Dross

Front 23

What are the main causes of dross formation?

A. Incorrect cutting speeds.

B. Incorrect amperage setting for the material being cut

C. Incorrect stand off distance and

D. A worn out nozzle

E. All of the above

Back 23

E. All of the above.

Front 24

____ cutting is a thermal cutting process where melting the base material is accomplished using an electric arc established between the base metal and an electrode.

A. PAC

B. Arc.

Back 24

B. Arc.

Front 25

Air carbon arc cutting is a cutting process in which metals are melted by the heat of an arc established between a carbon electrode and the base metal which is aka ? Molten metal is forced away from the cut by a jet stream of compressed air.

Back 25

Arc gouging

Front 26

____ is one effective method for removing any remaining carbon deposits. ?

Back 26

Grinding.

Front 27

Arc gouging is used to gouge out ______ weld metal for repair?

Back 27

Defective

Front 28

For CAC-A no ___ shade lense is recommended with up to 500 amp and number 14 for high amps?

Back 28

12

Front 29

The noise level of the air carbon process is between ?

A. 10-30 decibels

B. 100-115 decibels

C. 95-115 decibels.

Back 29

C.

Front 30

When the CAC-A process is set up for automatic or semi operating modes, a 100% ____ cycle rates constant voltage power source may be required.

Back 30

Duty cycle.

Front 31

What 3 type of coating on electrodes for carbon arc cutting ?

A. DC copper coated

B. Dc plain

C. Ac copper coated

D. All of the above.

Back 31

D. All of the above.

Front 32

Dc copper coated electrodes last longer and carry higher currents than plain electrodes ? Do they result in a more uniform groove width? True or false.

Back 32

True.

Front 33

Compressed air of sufficient volume with a pressure ranging from 80psi-100psi is normally required for air carbon arc gouging ? True or false?

Back 33

True

Front 34

Carbonization of the base metal and surface hardening is the two most common problem encountered during air arc cutting or gouging ? True or false.

Back 34

True.

Front 35

_____ sometimes called carburization of the base metal occurs when the process is used incorrectly ?

Back 35

Carbonization

Front 36

The copper from the electrode coatings does not transfer into the base metal if used correctly ? True or false ?

Back 36

True.

Front 37

Surface ____ is a problem when arc air gouging cast irons and higher carbon steels.

Back 37

Hardening.

Front 38

The work angle should be half that of the joint angle ? True or false

Back 38

True

Front 39

_____ arc cutting (SMAC) uses the high temperatures produced by the arc which range from 6500-10000 f ) the arc force and gravity removes the molten metal from the cut area. Leave a very rough edge surface.

Back 39

Shielded.

Front 40

____ arc cutting (cac) is similar to shielded metal arc cutting except a pointed carbon electrode is used instead of a coated metal electrode. No compressed air. The arc melts the metal and arc force and gravity remove the molten metal, which produces the cut.

Back 40

Carbon

Front 41

_____ are cutting (AOC) uses hollow or tubular electrodes.

Back 41

Oxygen