Gogeobic community college Flashcards
Welding Semester Finals
The process of preparing a CNC cutting project by aligning the cutting material on the table, moving the gantry and torch tip to the desired starting point on the material and resetting the programs axis values to zero.
a. node editing
b. zeroing
c. nesting process
d. jog
Zeroing
Optional cutting path selections based on whether the part to be “cut out” is the actual part(male part) or the scrap(female part)
a. fe/male pattern
b. feed rate
c. nesting
d. DXF
Female/Male pattern
in CNC operations, the process of “manually” traveling the gantry around the table w.o using a G-Code program. Used during set-up or for removal of parts from the table.
a. feed rate
b. nesting process
c. node editing
d. jog
Jog
A CAD data file format developed for enabling compatibility between autoCAD and other programs.
a. DXF
b. coordinate system
c. Gantry
d. node editing
DXF
the common name for the most widely used numerical controlled programming language. it is used mainly in computer aided manufacturing to control automated machine tools.
a. DXF
b. G-Code
c. node editing
d. nesting process
g-code
Brazing
joining process where filler metals melt above 840 deg. F
HAZ
heat affected zone
Braze welding
joining process similar to brazing temps. @ 840 deg. F and/or above
soldering
joining process where filler metals melt below 840 deg. F
the air jet orifices on the carbon arc electrode holder should be positioned so they’re centered over the electrode to ensure max air contact with the arc
t/f
true
the air carbon arc process uses compressed argon gas along with welding electrodes to remove unwanted metal from welds and/or parts
T/F
false
the air carbon arc process requires:
a. hearing protection
b. head/face/eye protection equal to that for arc welding processes
c. adequate ventilation
d. all above
all above
the air carbon arc process is similar to arc welding processes because:
a. it uses an electrode to perform the work
b. provides way of joining metals
c. both
d. none
A.
an ex. of a task suitable for using the CAC-A process is:
a. removing aluminum fillet weld
b. gouging out a crack in 1” thick steel plate
c. cutting off a seized, heavily corroded bolt from steel
d. all above
D.
the air carbon arc cutting and gouging can be performed in the:
a. flat and horizontal pos.
b. vertical pos.
c. overhead pos.
d. all above
D
Proper technique must be used with CAC-A:
a. to prevent a “black spray” of sparks and molten metal.
b. to keep work piece free of excess contaminants and slag build up
c. to direct the air stream and sparks in a safe direction
d. All above
D
CAC-A uses:
a. AC, DCEP
b. DCEN only
c. AC only
d. high freq. start only
A
PAC stands for?
Plasma arc cutting
when using high pressure cylinders as the PAC air supply, the cylinder must be equipped with an adjustable high pressure_____.
a. valve cap
b. regulator
c. flow valve
d. none
B
Maximum torch lead lengths including extensions is limited to:
a. 200 ft.
b. 75 ft
c. 100 meters
d. 100 ft.
D
Steps to test the quality of the air supply incl. using:
a. welding filter lens
b. dust mask
c. air testing equip.
d. all above
A
when assembling the torch parts into the torch head, position the torch facing _____ to keep all parts from falling out.
a. upward
b. down
c. either one
d. none
A
with ______ heating, parts to be brazed are placed on trays.
a. resistance
b. manual
c. dip
d. induction
e. furnace
E
in the ______ brazing process, heat is generated in the same manner as in spot welding.
a. resistance
b. manual
c. dip
d. induction
e. furnace
A
in the______brazing process, heat occurs by the resistance of the object to current flow through a coil.
a. resistance
b. manual
c. dip
d. induction
e. furnace
D
in the_____brazing process, parts to be brazed are immersed in a molten brazing metal.
a. resistance
b. manual
c. dip
d. induction
e. furnace
C
in the_____brazing process, a gas torch is used to apply the required heat.
a. resistance
b. manual
c. dip
d. induction
e. furnace
B
_____inhibits the formation of oxides during brazing
a. solidus
b. capillary action
c. flux
d. surface preparation
e. filler metal
C
_____includes removing dirt, oil, grease and oxides.
a. solidus
b. capillary action
c. flux
d. surface preparation
e. filler metal
D
_____is the highest temp. of the base metal reached in a solid state.
a. solidus
b. capillary action
c. flux
d. surface preparation
e. filler metal
A
_____is the force that distributes liquid filler metal through surface tension between the closely spaced surfaces of a joint.
a. solidus
b. capillary action
c. flux
d. surface preparation
e. filler metal
B
_____is available in wire, rod, strip and powder form
a. solidus
b. capillary action
c. flux
d. surface preparation
e. filler metal
E
_____involves applying a thin coating of solder.
a. sweat soldering
b. seam soldering
c. tinning
d. braze welding
e. brazing
C
_____joins 2 work pieces w/o any solder being visible.
a. sweat soldering
b. seam soldering
c. tinning
d. braze welding
e. brazing
A
_____involves depositing a layer of solder along the outside edge of the joint.
a. sweat soldering
b. seam soldering
c. tinning
d. braze welding
e. brazing
B
_____uses a filler metal that is not distributed by capillary action
a. sweat soldering
b. seam soldering
c. tinning
d. braze welding
e. brazing
D
_____uses 2 basic joints - the butt and lap joint
a. sweat soldering
b. seam soldering
c. tinning
d. braze welding
e. brazing
E
Copper and copper alloys
a. BalSi(aluminum-silicon)
b. BcuZn(copper-zinc)
c. BMg(magnesium)
d. BcuP(copper-phosphorus)
e. BNi(nickel)
D
magnesium and magnesium alloys
a. BalSi(aluminum-silicon)
b. BcuZn(copper-zinc)
c. BMg(magnesium)
d. BcuP(copper-phosphorus)
e. BNi(nickel)
C
Stainless steels, carbon steels, low alloy steels, copper
a. BalSi(aluminum-silicon)
b. BcuZn(copper-zinc)
c. BMg(magnesium)
d. BcuP(copper-phosphorus)
e. BNi(nickel)
E
ferrous and nonferrous metals
a. BalSi(aluminum-silicon)
b. BcuZn(copper-zinc)
c. BMg(magnesium)
d. BcuP(copper-phosphorus)
e. BNi(nickel)
B
Aluminum and aluminum alloys
a. BalSi(aluminum-silicon)
b. BcuZn(copper-zinc)
c. BMg(magnesium)
d. BcuP(copper-phosphorus)
e. BNi(nickel)
A
PAC eye protection
Helmet with proper shade setting
Eye protection
PAC fumes exhaust
Ventilation
CAC-A process
Cutting of metals is accomplished by melting with the heat of an arc between a carbon electrode and the base metal
Power can be supplied with either a(n) ______ or ______ welding machine
AC or DC
In general, the required air pressure range for CAC-A ranges from ____ to ____psi
40-80
Heavy duty CAC-A systems require air pressure between ____psi and _____psi
80 - 100
2 types of electrodes are used for CAC-A
Plain carbon-graphite or copper-clad carbon-graphite
PAC process
That uses a constricted arc to remove molten metal with a high-velocity jet of arc plasma (ionized gas) issued from a constricting orifice.
Arc plasma
Gas superheated to an ionized condition, enabling it to conduct an electric current.
PAC uses the same type of constant current power sources as _______ & _______.
SMAW, GTAW
Why is PAC similar to GTAW?
Because it uses tungsten electrodes & req. shielding gas to protect the electrode and molten metal
Shop air is the most efficient orifice gas for PAC
T/F
True
What types of metals can PAC cut?
Any known metal
PAC uses Extremely high velocity and hotter than any other flame ______-______ degrees F
30,000 - 43,000
Dross
Non metallic solid material entrapped in the weld metal
