CWB Superdeck Flashcards
The best elements in a drill bill to maintain resistance to tempering should be;
a. nickel and cobalt
b. carbon and silicon
c. chromium and tungsten
d. vanadium and nickel
c. chromium and tungsten
Fast cooling rates through the transformation temperature range (800-500C) in steel;
a. develop a mixed arrangement of ferrite and pearlite grains
b. promote a coarser pearlite structure
c. suppress the transformation temperature
d. dissolves the original martensitic grains
c. suppress the transformation temperature
A crystal that has an edge dislocation means:
a. it has an extra half plane of atoms
b. it has perfect crystal with no imperfections
c. it does not block any movement of atoms
d. none of the above
a. it has an extra half plane of atoms
GMAW welding to produce a flat fillet weld face profile in the horizontal position is typically performed using a:
a. 10 degree travel angle using a push technique and a 45 degree work angle
b. 20 degree travel angle using a drag technique and a 45 degree work angle
c. 20 degree travel angle using a push technique and a 45 degree work angle
d. 40 degree travel angle using a drag technique and a 45 degree work angle
c. 20 degree travel angle using a push technique and a 45 degree work angle
There are three variations of the friction welding process.
a. true
b. false
b. false
there are two; friction welding and friction stir welding
GTAW electrodes may be ground to the shape of a cone. What is the effect of a large vertex angle on weld bead width?
a. the bead width is increased
b. the bead width is reduced
c. there is no effect
d. the bead width becomes irregular
b. the bead width is reduced
Stress relaxation is a method used for:
a. compensating for the results of shrinkage stresses
b. removing distortion
c. predicting residual stresses
d. measuring residual stresses
d. measuring residual stresses
What is the difference between transverse shrinkage and angular distortion in a butt joint?
a. the width in the transverse direction is less, and in angular distortion both plates contract forming a pronounced angle
b. the width in the transverse direction is more, and in angular distortion both plates contract forming a pronounced angle
c. both mean the same thing
d. none of the above
b. the width in the transverse direction is more, and in angular distortion both plates contract forming a pronounced angle
The kerf area of an oxy-fuel cut edge represents an area of __________ stress.
a. compressive
b. shear
c. flexural
d. tensile
d. tensile
Part of a good welding procedure should include:
a. welding process, filler metal, maximum heat input
b. power source, speed of welding, and pre-heating
c. welding technique, voltage, and distortion
d. joint design, power source, and electrode colour
b. power source, speed of welding, and pre-heating
What procedure would be used to complete a butt joint in an austenitic stainless steel clad carbon steel plate?
a. complete the joint using an E4918 electrode
b. complete the carbon steel side first using an E4918 electrode and then the stainless side using an austenitic stainless filler metal
c. complete the stainless side first using an austenitic stainless steel filler metal and then the carbon side using an E4918 electrode
d. butter the carbon steel using an austenitic filler metal and then with the an E4918 electrode
b. complete the carbon steel side first using an E4918 electrode and then the stainless side using an austenitic stainless filler metal
Which stainless steel SMAW electrode listed is designed for DC only and all position welding?
a. E309-16
b. E309-17
c. E309-25
d. E309-15
d. E309-15
Austenitic stainless steel weldments are more likely than carbons steel weldments to suffer from distortion because stainless steel:
a. has a higher thermal conductivity than carbon steel
b. requires a greater heat input to weld, has lower strength than carbon steel
c. has a 50% greater coefficient of thermal expansion than carbon steel
d. has a lower electrical resistivity than carbon steel at room temperature
c. has a 50% greater coefficient of thermal expansion than carbon steel
What ferrite number is considered necessary to prevent fissuring?
a. 1-10
b. 3-6
c. 5-9
d. 7-10
b. 3-6
Calibration using the 1.5mm side-drilled hole in the IIW block is done for;
a. resolution
b. sensitivity
c. distance
d. gates
b. sensitivity
When the transducer thickness decreases:
a. the frequency increases
b. the frequency stays the same
c. the frequency decreases
d. the frequency generates less current
a. the frequency increases
P-scans offer a colour representation of flaws shown in:
a. plan view
b. perspective view
c. three-dimensional representation
d. positive imaging
c. three-dimensional representation
What limits AC to surface detection only?
a. flux build up
b. alternating current flow
c. lower currents
d. external flux leakage
d. external flux leakage
The direction of the magnetic field in the center of a coil:
a. is parallel to the axis of the coil
b. is at right angles to the axis of the coil
c. saturates the metal and creates a magnetic field
d. travels the opposite direction to the current
a. is parallel to the axis of the coil
The magnetism that stays within a part after the magnetizing field is removed is called:
a. coercive force
b. permanence
c. retentivivty
d. residual magnetism
d. residual magnetism
A metal frame is fabricated using a plate with 0.25% of carbon content and is subjected to fatigue and a temperature -30C. What would be the best choice of welding rod for this condition?
a. E7018
b. E6013
c. E6010
d. E7024
a. E7018
What are the three most widely used arc welding processes for joining nickel and its alloys?
a. PAW, GTAW and FCAW
b. SMAW, SAW and FCAW
c. GTAW, GMAW and SMAW
d. GMAW, GTAW and PAW
c. GTAW, GMAW and SMAW
What is the force or pressure that causes current to flow through an electric circuit?
a. resistance
b. inductance
c. electrical potential
d. reactance
c. electrical potential (voltage)
The radius of the plunger for a bend test:
a. is 5 times the material thickness
b. is a function of material yield strength
c. depends on the die opening
d. is a function of the material UTS
b. is a function of material yield strength
Which type of metallographic test is used for grain size determination?
a. corrosion testing
b. Charpy impact test
c. macro exams
d. micro exams
d. micro exams
What best describes proof testing?
a. tensile and creep testing
b. overload testing
c. electrostatic testing
d. corrosion testing
b. overload testing
What is “Ultimate tensile strength”?
a. another term for Young’s Modulus
b. the largest force applied to a tensile specimen divided by the specimen’s original cross section
c. the highest stress at which the elastic limit is exceeded
d. the highest forced recorded during a tensile test
b. the largest force applied to a tensile specimen divided by the specimen’s original cross section
Unrestricted expansion from localized heating causes shape change.
a. true
b. false
b. false
_________ distortion results from the non-uniform contraction of weld metal due to the greater width of the face of the weld compared with the root.
a. longitudinal
b. angular
c. transverse
d. buckling
b. angular
Local heating always produces contraction during cooling of the base metal.
a. true
b. false
a. true
Shrinkage tends to become constant when the resisting section exceeds a certain value.
a. true
b. false
a. true
__________ stresses are internally self-balancing stresses that can cause elastic strains that are recoverable if the stress is removed.
a. induced
b. residual
c. angular
d. shear
b. residual
What is the primary cause of longitudinal distortion?
a. longitudinal contraction likely in thin plates
b. shortening in length
c. unbalanced residual stresses
d. transverse plus contraction longitudinal
b. shortening in length
What is the primary cause of bending distortion?
a. transverse contraction
b. unbalanced residual stresses
c. longitudinal contraction likely in thin plates
d. longitudinal plus transverse
b. unbalanced residual stresses
What is the primary cause of angular distortion?
a. transverse contraction
b. unbalanced residual stresses
c. longitudinal contraction likely in thin plates
d. longitudinal plus transverse
a. transverse contraction
What is the primary cause of twisting distortion?
a. transverse contraction
b. unbalanced residual stresses
c. longitudinal contraction likely in thin plates
d. longitudinal plus transverse
c. longitudinal contraction likely in thin plates
What is the primary cause of bucking distortion?
a. transverse contraction
b. unbalanced residual stresses
c. longitudinal contraction likely in thin plates
d. longitudinal plus transverse
d. longitudinal plus transverse
How much surface deformation must peening produce to be effective?
a. 5-10%
b. 10-15%
c. 15-20%
d. 20-30%
b. 10-15%
Strip heats are directional, pulling ______ as much transverse to the heat as parallel to the axis of the strip?
a. just
b. twice
c. thrice
d. ten times
b. twice
Retracing a heat pattern will only relieve the stresses when hot and reproduce them when cold.
a. true
b. false
a. true
The final camber should be checked before the member has cooled completely.
a. true
b. false
b. false
An iron carbide phase in steel that is comprised of three iron atoms and one carbon atom, and appears as small hard particles of layers in the microstructure.
-
a. pearlite
b. ferrite
c. austinite
d. cementite
d. cementite
A solution of one or more elements in the FFC phase of iron.
a. pearlite
b. ferrite
c. austinite
d. cementite
c. austinite
A solid solution in a BBC phase of iron which dissolves very small amounts of carbon.
a. pearlite
b. ferrite
c. austinite
d. cementite
b. ferrite
This microstructure is formed by quenching austenite containing iron, which forms a metastable phase that has the carbides present in needle-like structures.
a. martensite
b. ferrite
c. austinite
d. cementite
a. martensite
An operation used to control grain size and reduce residual stresses by heating a material to a single phase region and then allowing it to cool in air.
a. annealing
b. normalizing
c. tempering
d. precipitation hardening
b. normalizing
A heat treatment used to increase the strength of malleable materials through the formation of coherent second phase particles.
a. annealing
b. normalizing
c. tempering
d. precipitation hardening
d. precipitation hardening
An operation designed to modify the properties of a steel resulting from quenching, often applied to reduce hardness and increase toughness without greatly reducing strength.
a. annealing
b. normalizing
c. tempering
d. precipitation hardening
c. tempering
An operation used to soften steel and improve maintainability, and to relieve internal stresses by a material to a single phase region and then controlling it’s cooling rate in a furnace.
a. annealing
b. normalizing
c. tempering
d. precipitation hardening
a. annealing
There are three ways in which a load can act on a cross-sectional area in a body, which of the following is not one of them?
a. shear
b. compression
c. twisting
d. tension
c. twisting
To create a flux leakage, the lines of flux must run parallel to the discontinuity.
a. true
b. false
b. false
it must run across the discontinuity
Which code is for aluminum and aluminum alloy SMAW electrodes?
a. AWS Specification A5.10
b. AWS Specification A5.3
c. AWS Specification A5.1
d. AWS Specification A5.4
b. AWS Specification A5.3
Which code is for stainless steel SMAW?
a. AWS Specification A5.10
b. AWS Specification A5.3
c. AWS Specification A5.1
d. AWS Specification A5.4
d. AWS Specification A5.4
Which code is for carbon steel SMAW?
a. AWS Specification A5.10
b. AWS Specification A5.3
c. AWS Specification A5.1
d. AWS Specification A5.4
c. AWS Specification A5.1
Which code is for low alloy steel SMAW?
a. AWS Specification A5.5
b. AWS Specification A5.18
c. AWS Specification A5.17
d. AWS Specification A5.21
a. AWS Specification A5.5
Which code is for bare aluminum and aluminium alloy electrodes?
a. AWS Specification A5.10
b. AWS Specification A5.3
c. AWS Specification A5.1
d. AWS Specification A5.4
a. AWS Specification A5.10
Which code is for carbon steel GTAW and GMAW?
a. AWS Specification A5.5
b. AWS Specification A5.18
c. AWS Specification A5.17
d. AWS Specification A5.21
b. AWS Specification A5.18
Which code is for carbon steel SAW?
a. AWS Specification A5.5
b. AWS Specification A5.18
c. AWS Specification A5.17
d. AWS Specification A5.21
c. AWS Specification A5.17
What is the code for hard surfacing wires?
a. AWS Specification A5.5
b. AWS Specification A5.18
c. AWS Specification A5.17
d. AWS Specification A5.21
d. AWS Specification A5.21
What is the code for stainless steel wires?
a. AWS Specification A5.22
b. AWS Specification A5.18
c. AWS Specification A5.17
d. AWS Specification A5.21
a. AWS Specification A5.22
Which code is for low alloy steel fluxcore wires?
a. AWS Specification A5.22
b. AWS Specification A5.29
c. AWS Specification A5.9
d. AWS Specification A5.28
b. AWS Specification A5.29
Which code is for low alloy steel metalcore wires?
a. AWS Specification A5.22
b. AWS Specification A5.29
c. AWS Specification A5.9
d. AWS Specification A5.28
d. AWS Specification A5.28
Which code is for bare stainless steel electrodes?
a. AWS Specification A5.22
b. AWS Specification A5.29
c. AWS Specification A5.9
d. AWS Specification A5.28
c. AWS Specification A5.9
Which code is for flux and metal cored stainless steel electrodes?
a. AWS Specification A5.22
b. AWS Specification A5.29
c. AWS Specification A5.9
d. AWS Specification A5.28
a. AWS Specification A5.22
What is the code for carbon steel flux cored wires?
a. CSA Standard W48 and AWS Specification A5.20
b. CSA Standard W48-18 and AWS Specification A5.36M
c. CSA Standard Z662
d. AWS Specification D1.1
a. CSA Standard W48 and AWS Specification A5.20
What is the code for low alloy steel MCAW and FCAW wires?
a. CSA Standard W48 and AWS Specification A5.20
b. CSA Standard W48-18 and AWS Specification A5.36M
c. CSA Standard Z662
d. AWS Specification D1.1
b. CSA Standard W48-18 and AWS Specification A5.36M
What is the Oil and Gas Pipeline Systems Code?
a. CSA Standard W48 and AWS Specification A5.20
b. CSA Standard W48-18 and AWS Specification A5.36M
c. CSA Standard Z662
d. AWS Specification D1.1
c. CSA Standard Z662
What is the Structural Welding Code-Steel?
a. CSA Standard W48 and AWS Specification A5.20
b. CSA Standard W48-18 and AWS Specification A5.36M
c. CSA Standard Z662
d. AWS Specification D1.1
d. AWS Specification D1.1
In SMAW welding, what kind of current is generated by a transformer or alternator power source?
a. AC
b. DC
c. AC and DC
d. both DCEP and DCEN
a. AC
In SMAW welding, what kind of current is generated by a transformer/rectifier or motor generator power source?
a. AC
b. DC
c. AC and DC
d. both DCEP and DCEN
b. DC
In SMAW welding, what kind of current is generated by a single phase transformer/rectifier or alternator/rectifier power source?
a. AC
b. DC
c. AC and DC
d. both DCEP and DCEN
c. AC and DC
Which of the following gases has the highest ionization potential?
a. helium
b. argon
c. nitrogen
d. hydrogen
a. helium
helium - 24.9 eV,
argon - 15.8 eV,
nitrogen - 14.5 eV,
hydrogen - 13.6 eV,
oxygen - 13.6 eV
In GTAW welding, when using AC, why should electrodes with thoria be avoided?
a. they will not form a ball
b. they can split when using low currents
c. they can split when using high currents
d. they release low levels of radiation
c. they can split when using high currents
In GTAW welding, why does DCEP have a lower current than DCEN?
a. they have the same level of current
b. the tungsten electrode emits electrons more efficiently than the weld pool
c. the tungsten electrode emits electrons less efficiently than the weld pool
d. the tungsten electrode emits electrons more efficiently than the parent metal
b. the tungsten electrode emits electrons more efficiently (DCEN) than the weld pool (DCEP)
What is the typical tip-to-work distance for DCEP SAW welding
a. roughly 3 times the wire diameter
b. roughly 5 times the wire diameter
c. roughly 8 times the wire diameter
d. roughly 10 times the wire diameter
c. roughly 8 times the wire diameter
Neutral SAW fluxes participate in slag-metal reactions, but the changes in silicon and manganese are smaller and not dependent on arc voltage.
a. true
b. false
a. true
Which SAW process uses both DC and AC power sources at the same time?
a. twin wire welding
b. tandem welding
c. series welding
d. single wire welding
b. tandem welding
Which SAW process uses two electrodes connected in parallel?
a. twin wire welding
b. tandem welding
c. series welding
d. single wire welding
a. twin wire welding
Which SAW process has the current path from one electrode to a second electrode through the weld pool?
a. twin wire welding
b. tandem welding
c. series welding
d. single wire welding
c. series welding
When using DC for SAW, why is the current usually kept below 1000 Amps?
a. solidification cracking can increase
b. the chances of burn through increase
c. there can be excessive arc blow
d. the equipment is very expensive
c. there can be excessive arc blow
How many times greater is the current requirements for SAW over SMAW of GMAW?
a. 1 to 2 times higher
b. 2 to 3 times higher
c. 4 or 5 times higher
d. they are the same
c. 4 or 5 times higher
With RSW (resistance seam welding), what should the distance from the nugget to the edge of the sheet be?
a. the same as the nugget diameter
b. 1.5 times the nugget diameter
c. 2 times the nugget diameter
d. the distance doesn’t matter
b. 1.5 times the nugget diameter
What is used in DC circuits to store and release voltage according to the circuit requirements?
a. resistor
b. reactor
c. capacitor
d. diode
c. capacitor
What is an electric component that can store energy in a magnetic field created by the electric current passing through it?
a. resistor
b. reactor
c. capacitor
d. diode
b. reactor
What is a component that coverts electrical energy into heat, light, ect?
a. resistor
b. reactor
c. capacitor
d. diode
a. resistor
What is a semiconductor material that can conduct current in one direction when forward biased?
a. resistor
b. reactor
c. capacitor
d. diode
d. diode
____________ strain is when a specimen extends plastically without much change in stress an area.
a. permanent
b. plastic
c. yield
d. ultimate
c. yield
During a tensile test, if the specimen is observed during the test, it is seen that at some location the sample begins to become thinner at its cross-section, this is know as _________.
a. necking
b. legging
c. yield strain
d. elongation
a. necking
This is a test for revealing internal weld defects.
a. Tekken
b. drop weight
c. nick-break
d. fillet weld break
c. nick-break
This is a test for revealing the general quality of the weld.
a. Tekken
b. drop weight
c. nick-break
d. fillet weld break
d. fillet weld break
This hardness test consists of a vertically mounted hydraulic cylinder, which is used to force a ball into the surface of the metal to be tested.
a. Tekken
b. Vickers
c. Brinell
d. Rockwell
c. Brinell
The ___________ test determines the hardness by measuring the depth of penetration of a diamond indenter under a large load compared to the penetration made by a preload.
a. Tekken
b. Vickers
c. Brinell
d. Rockwell
d. Rockwell
This hardness test has the advantage of being able to use a wide range of loads and is able to cover materials from very soft to very hard using the same pyramid shaped indenter.
a. Tekken
b. Vickers
c. Brinell
d. Rockwell
b. Vickers
This test is not normally used for metals and welds but is more commonly used for plastic toughness testing.
a. drop weight
b. Vickers
c. Izod
d. Charpy
c. Izod
The minimum temperature at which a Drop Weight test specimen breaks is known as the nil-ductility transition temperature (NDTT).
a. true
b. false
b. false
it is the maximum temperature
At temperatures below ____, iron exists in the BBC form.
a. 723C
b. 912C
c. 912C - 1394C
d. 1237C
b. 912C
At the temperatures range from _______, iron exists in the FCC form.
a. 723C
b. 912C
c. 912C - 1394C
d. 1237C
c. 912C - 1394C
In which structure does very little carbon dissolve?
a. BCC
b. FCC
c. CPH
d. all of them dissolve carbon
a. BCC
In which structure does carbon completely dissolve?
a. BCC
b. FCC
c. CPH
d. all of them dissolve carbon
b. FCC
If the rate of cooling is increased, transformation occurs at ______ temperatures.
a. the same
b. higher
c. lower
d. much lower
c. lower
A stress relief treatment is carried out _____ the metallurgical transformation temperature and _______ cause changes.
a. above, should not
b. below, should
c. below, should not
d. above, should
c. below, should not
During re-crystallization, new grains have a _____ dislocation density.
a. highest
b. high
c. low
d. lowest
c. low
Substitutional solid solution strengthening occurs when the alloy atom is ____ enough that it can ____ host atoms at their lattice positions.
a. small, replace
b. large, replace
c. small, displace
d. large, displace
b. large, replace
Interstitial solid solutions for when the alloy atom is _____ to fit at interstitial sites _____ the host metal atoms.
a. small, between
b. small, next to
c. large, between
d. large, next to
a. small, between
The ____ temperature reached will determine what metallurgical changes will occur.
a. lowest
b. median
c. peak
d. average
c. peak
The majority of the arc energy is transferred to the work when the GTAW process is operated in ___________ polarity.
a. DCEP
b. DCEN
c. AC
d. AC unbalanced
b. DCEN
The electrode represented by EXX15, EXX16, and EXX18 have ____________ as a major ingredient in the coating.
a. titania
b. cellulose
c. limestone
d. none of the above
c. limestone
The main controllable process variables for the resistance welding process are _____________.
a. electrode size, pressure, current and time
b. current, pressure and time
c. base metal, current, time and pressure
d. base metal, current and time
a. electrode size, pressure, current and time
The conductor size of the secondary windings of a welding transformer power source is ___________.
a. smaller than the primary winding
b. the same as the primary winding
c. larger than the primary winding
d. none of the above
c. larger than the primary winding
Mechanical reactor control is used on which type of welding power source?
a. saturable reactor
b. inverter
c. silicon controlled rectifier
d. none of the above
d. none of the above
Which was the first type of welding power source to provide accurate control of the pulsed GMAW process over a wide range of pulse frequencies?
a. inverters
b. transistor output
c. saturable reactors
d. SCR control
b. transistor output
Synergic control is typically used for the ________ process.
a. PAW
b. GMAW
c. SMAW
d. SAW
b. GMAW
Which one of the devices indicated in the following list is a microprocessor control?
a. motors
b. resistors
c. relays
d. transistors
d. transistors
The classification B-G 49A 3 C1 S2 solid wire electrode adds what alloy elements for multiple deoxidizing?
a. silicon, manganese, titanium, aluminum and zirconium
b. silicon and manganese only
c. zirconium, manganese, aluminum, titanium and copper
d. silicon, manganese, titanium and nickel
a. silicon, manganese, titanium, aluminum and zirconium
Elastic deformation is best describes as:
a. permanent deformation caused by welding stresses
b. deformation that does not exceed the yield point
c. an increase in the dimensions of a body
d. stress that causes contraction or shrinkage
b. deformation that does not exceed the yield point
Flame straightening involves:
a. uniformly heating to produce an expansion
b. uniformly heating to produce a contraction
c. locally heating the weldment to produce a contraction
d. locally heating the weldment to produce an expansion
c. locally heating the weldment to produce a contraction
The longitudinal free shrinkage of a welded butt joint in steel plate produces:
a. a high tensile residual stress longitudinally in the welds
b. a high compressive residual stress longitudinally in the weld
c. a low tensile residual stress longitudinally in the weld
d. a high tensile residual stress transverse across the weld
a. a high tensile residual stress longitudinally in the welds
The basic oxygen furnace makes use of what property to assist in removing impurities from the melt?
a. a lining of silicon brick in the furnace
b. hot air which can generally gas off the impurities
c. oxygen at low temperatures
d. a refactory lining of basic material
d. a refactory lining of basic material
Grain size can influence the properties of steel in significant ways. Which heat treatment is usually selected to improve a steels toughness?
a. annealing reduces grain size to increase toughness
b. normalizing reduces grain size to increase toughness
c. quenching and then cold working increases the grain size to increase toughness
d. tempering reduces the martensitic grain size to improve toughness
b. normalizing reduces grain size to increase toughness
A thermal stress relief treatment is often specified for welded fabrications for several reasons. Which of the following applies to stress relief.
a. stress relief causes tempering of the cementite/ferrite lath structure known as pearlite
b. stress relief improves dimensional stability during machining
c. a stress relief treatment is carried out above the metallurgical transformation temperature and will cause some changes in the metallurgical structure
d. stress relief to reduces grain size and thus increases fracture toughness
b. stress relief improves dimensional stability during machining
How can the structure of martensite be improves to increase its toughness but maintain the significant strength of the steel?
a. by tempering the martensite in the austenitic range followed by a slow, controlled cool
b. by a simple stress relief followed by a second post-stress relief hold at low temperatures
c. by normalizing at a temperature below the recrystallization temperature
d. by tempering the martensite at temperatures where no changes take place in the crystal structure
d. by tempering the martensite at temperatures where no changes take place in the crystal structure
The energy input is a very important parameter. What significant parts of the weld operation and weld does it relate to?
a. the size and length of the weld and the cooling rate
b. the size of the weld, the width of the HAZ and the cooling rate
c. the width of the HAZ, the alloy type and the cooling rate
d. the size of the weld, the width of the HAZ and the steel alloy
b. the size of the weld, the width of the HAZ and the cooling rate
There are some peculiar features of the cracking mechanism known as hydrogen embrittlement. One of which is?
a. it occurs above a temperature of around 150C
b. it occurs below the temperature of around 150C
c. it occurs only in slow cooling from austenite
d. it is unaffected by local stresses
b. it occurs below the temperature of around 150C
In a susceptible steel, what steps can be taken to prevent the production of martensite in the weld zone?
a. ensure the heat input is kept to a minimum
b. ensure the cooling rate is sufficiently fast
c. use smaller electrode diameters in the fill passes
d. ensure the cooling rate is sufficiently slow
d. ensure the cooling rate is sufficiently slow
What property does an FCC austenitic stainless steel have that will make the size of the weld pool larger for the same heat input when compares with welding a BCC carbon steel?
a. the FCC lattice dissolves more carbon thus making it resistant too electrical input from the welding arc
b. the melting temperature and thermal conductivity of the FFC austenitic stainless is less than that of the BCC carbon steel
c. the melting point of the FCC stainless is much higher than the BCC carbon steel
d. the welding arc is much smoother and more stable with an FCC consumable, thus making it easier to penetrate the base material under the welding arc
b. the melting temperature and thermal conductivity of the FFC austenitic stainless is less than that of the BCC carbon steel
In order to reduce the probability of solidification cracking in FCC austenitic stainless steels there are a number of approaches. Which of the following is correct?
a. arrange for the welding consumables to contain a small amount of delta ferrite or use very low sulphur materials
b. use austenitic plat that is more than 6% nickel and use stabilized 316L consumables
c. arrange for the weld zone to be put into compression and use carbon steel filler that solidifies as BCC ferrite first
d. arrange for welding consumables to always solidify as austenitie first and preheat to a minimum of 150C
a. arrange for the welding consumables to contain a small amount of delta ferrite or use very low sulphur materials
Why is it acceptable to use the gas shielded fluxcore welding process on stainless steel with shielding gases that are relatively high in carbon dioxide?
a. it’s acceptable only with the low carbon grades of austenitic stainless steels as a welding procedural method for gaining some strength without subsequent heat treatment
b. the slag formed with the process protects the weld from excessive chromium pick up
c. the slag formed with the process protects the weld from carbon pick up
d. the carbon dioxide in the shielding gas forces the transfer into spray and therefore produces a shallow, less diluting penetration
c. the slag formed with the process protects the weld from carbon pick up
If martensitic stainless teels are joined using FCC austenitic electrodes, certain precautions may still need to be taken. Which if the following would be a correct approach?
a. use a high heat input to increase the HAZ grain size and thus maintain toughness to prevent HICC
b. use the prescribes preheat so as to reduce the probability of cracking in the HAZ
c. as hot cracking is probability then select electrodes that will deposit elements that will reduce this probability
d. upon completion of welding, immediately quench with water spray to reduce the probability of solidification cracking
b. use the prescribes preheat so as to reduce the probability of cracking in the HAZ
When conducting impact tests on welds:
a. open specimen must be tested at each temperature
b. it is not important that the notch is machined from the exact location, only that is is from the weld
c. it is the most important that the specimens are machined from the HAZ only
d. it is most important that the notch is oriented correctly
d. it is most important that the notch is oriented correctly
A major advantage of the CTOD fracture mechanics test is?
a. it measures the toughness of the material in interest in joules
b. it can help to asses the significance of flaws within a structure
c. it does not depend on the type of material tested
d. it is independent of the chemical make-up of the material
b. it can help to asses the significance of flaws within a structure
Plastic deformation happens before the yield point.
a. true
b. false
b. false
The level of residual magnetic flux remaining in a ferromagnetic material when an applied field is removed is known as?
a. coercive force
b. permeability
c. retentivity
d. saturation
c. retentivity
Three changes in a material can cause a magnetic particle indications in the absence of a discontinuity. From the options below, choose one that does not apply
a. microstructure
b. composition
c. work hardening
d. excess flux leakage
e. heat treatment
d. excess flux leakage
For what research application has the potential drop method been used?
a. measuring the growth of fatigue cracks
b. measuring the growth of recrystallization
c. measuring the growth of HAZ cracks
d. measuring the growth of hot cracks
a. measuring the growth of fatigue cracks
For a given intensity of x-rays striking a specimen, what are the two main factors that affect the intensity that emerges from the specimen to strike the film?
a. thickness and permeability
b. thickness and type of material
c. retentivity and type of material
d. retentivity and permeability
b. thickness and type of material
The purpose of the IQI is to verify that all defects greater than 2% of the plate thickness have been detected.
a. true
b. false
b. false
From the list below, choose the one item you would not check for in a radiography procedure.
a. film processing
b. source of radiation
c. geometric arrangement
d. density of contrast
d. density of contrast
Which organization in Canada controls the use of gamma ray devices?
a. Natural Resources Canada
b. Canadian Nuclear Safety Commission
c. Canadian General Safety Board
d. Canadian National Nuclear Safety
b. Canadian Nuclear Safety Commission
Is it possible to use acoustic emission method for global monitoring of the structure service life.
a. true
b. false
a. true
The amplifier in a UT testing circuit preforms the following task:
a. it regulates the horizontal time-base
b. it regulates the vertical beam of deflection
c. it regulates the gate’s size
d. it regulates the frequency
b. it regulates the vertical beam of deflection
Which type of display gives a cross-sectional view showing the length and depth of discontinuities?
a. A-scan
b. B-scan
c. C-scan
d. P-scan
b. B-scan
A work hardened area due to forming may result in;
a. the material becomes non-magnetic
b. saturation
c. increased permeability
d. decreased permeability
d. decreased permeability
