Randoms Flashcards
Stress cracking is most likely to occur when welding thick material. This is due to:
a. Undercutting and nicking
b. Decreased cooling effect
c. Hydrogen embrittlement
d. Increased cooling effect
d. Increased cooling effect
In producing a drawing for a scale of 1:20, what would the distance represented by a distance on the drawing of 6 inches be:
a. 120 feet
b. 12 inches
c. 12 feet
d. 120 inches
d. 120 inches
The best form of distortion control when placing fillet welds on a long T-joint is:
a. Rigid clamping
b. Welding sequence
c. Sub assembly
d. Prebending or setting
b. Welding sequence
If the current is a flow of electrons they move in what direction:
a. From positive to negative
b. From negative to positive
c. They alternate each half cycle
d. They flow on positive side of neutral line
b. From negative to positive
The type of power source with a drooping volt-amp characteristic is:
a. C.A.V.
b. C.C.
c. C.P.
d. C.V.
b. C.C.
That portion of the joint to be welded where the members are closest to each other is termed:
a. Root edge
b. Root face
c. Root gap
d. Root opening
b. Root face
In a butt joint with the plates vertical and axis of the weld horizontal, the test position would be designated:
a. 4G
b. 3G
c. 2G
d. 1G
c. 2G
How many principal views are there in an orthographic drawing:
a. 3
b. 4
c. 5
d. 6
a. 3
If the time taken to pass through zero is minimized, there is a better chance the plasma will not completely collapse and the arc can be re-established. This system for improving arc stability in G.T.A.W. with A.C. is known as:
a. Correcting for unbalanced circuit
b. Waveform shaping
c. Surge injection
d. High frequency attenuation
b. Waveform shaping
The type of gas formed by the interaction of ultraviolet light, emitted from the arc, with the oxygen in the air is:
a. Phosgene
b. Carbon Monixide
c. Ozone
d. Carbon Dioxide
c. Ozone
The magnitude of current flow is measured in:
a. Ohms
b. Volts
c. Amps
d. Watts
c. Amps
If a worker is standing next to two machines, each producing a noise level of 95 dBA, what noise level is the worker exposed to:
a. 92 dBA
b. 95 dBA
c. 98 dBA
d. 190 dBA
c. 98 dBA
If the secondary coil has fewer turns in the primary coil, this is known as what type of transformer:
a. Step-up
b. Stationary
c. Step-down
d. Tap-type
c. Step-down
Which of the following fuel gases are lighter than air:
a. Propane
b. Butane
c. Propylene
d. Acetylene
d. Acetylene
When using the G.T.A.W. hot wire process, the power source for filler metal preheat is usually:
a. A.C.H.F.
b. D.C.E.N.
c. A.C.
d. D.C.
c. A.C.
The force or pressure with which an electric current is forced through a circuit is known as:
a. C.A.V.
b. E.M.F.
c. C.P.
d. Volts
b. E.M.F.
A product used in electrode coatings intended to operate on A.C. is:
a. Cellulose
b. Rutile
c. Potassium
d. Iron powder
c. Potassium
Fusible plugs melt as low as:
a. 165°F
b. 195°F
c. 212°F
d. 240°F
a. 165°F
When using direct current electrode negative with the S.M.A.W. process the type of penetration and weld width would be:
a. Deep and narrow
b. Deep and wide
c. Shallow and wide
d. Shallow and narrow
c. Shallow and wide
Ohm’s law is:
a. R = V x I
b. I = R x V
c. R = I/V
d. R = V/I
d. R = V/I
In G.T.A.W. electron flow is:
a. From positive to negative
b. From negative to positive
c. Alternates every half cycle
d. Travels constantly in the same direction
b. From negative to positive
A capped steel is similar to:
a. Rimmed steel
b. Semi-killed steel
c. Killed steel
d. None of the above
a. Rimmed steel
In Canada, most welding machines are connected to a high voltage supply of:
a. 575 volts
b. 480 volts
c. 240 volts
d. 120 volts
a. 575 volts
The proportion of parent metal melted into the weld is known as:
a. Buttering
b. Tranfser
c. Dilution
d. Solidification rate
c. Dilution
A method by which gases, principally hydrogen and oxygen, are removed by exposing the molten metal to low pressure is known as:
a. Vacuum pressurizing
b. Vacuum gassing
c. Vacuum depressurizing
d. Vacuum degassing
d. Vacuum degassing
A shunt generator is:
a. Separately excited
b. Self-excited
c. Nonexcitable
d. Brushless
b. Self-excited
The electrode coating containing titanium dioxide is:
a. Cellulose
b. Rutile
c. Potassium
d. Iron powder
b. Rutile
When the current reaches a certain level the magnetic field will tend to overload and further increases in current will not increase the field. This is known as:
a. Induction
b. Saturation
c. Resistance
d. Impedance
b. Saturation
What are good properties of the following alloys?
Nickel
Chromium
Molybdenum
Vanadium
Nickel - Corrosion resistant (Ni)
Chromium - Hard metal with high melting point (Cr)
Molybdenum - Withstands extreme temperatures (Mo)
Vanadium - Soft and ductile - Structural steel (V)
What does a blast furnace use?
Iron ore / limestone / coke
Limestone removes impurities
What happens in a blast furnace?
Oxygen is blown into the molten liquid metal and removed by deoxidation with silicon and aluminum
What is killed steels?
Killed steel is fully deoxidized with silicon and aluminium.
What is killed steel used for?
Fully killed steel is used for the core wire in electrodes
What does calcium do in steel
Improves through thickness ductility
What happens when you crop an ingot to high of killed steel?
Lamination may occur when rolling into plate.
What does small grain size do?
Increases strengh and toughness
