1 Flashcards
- Which of the following refers to a welder test where a pipe assembly is placed vertically and the joint welded in the horizontal position without rotating the assembly?
a) 1G
b) 2G
c) 3G
d) 5G
e) 6G
b) 2G
the correct penetrameter thickness for 2% sensitivity when radiographing a weldment 1.25 inches in thickness.
a) 0.012 in.
b) 0.015 in.
c) 0.025 in.
d) 0.030 in.
c) 0.025 in.
- The ultrasonic transducer is pressed against the plate of a welded joint. The sound travels longitudinally through the plate to the opposite side. The signal seen on the UT screen that comes from this opposite side of the plate:
a) Is the initial pulse signal.
b) Is the back reflection signal.
c) Is the front reflection signal.
d) Must be equal in amplitude to any defect signal.
e) Cannot be used for establishing the thickness of the material under test.
b) Is the back reflection signal.
- When applying a post-emulsifiable excess penetrant removal process, the excess penetrant is removed by:
a) Wiping with a dry cloth.
b) Rinsing with water.
c) Applying an emulsifier and then rinsing with water.
d) Using a solvent remover.
c) Applying an emulsifier and then rinsing with water.
- What is the orientation of the magnetic field at the center of a circular coil carrying current?
a) The direction of the magnetic field in the center of a coil is parallel to the axis of the coil.
b) The direction of the magnetic field in the center of a coil is perpendicular to the axis of the coil.
c) The magnetic field at the center of a coil is radial, pointing outward from the coil’s center.
d) There is no magnetic field at the center of a coil.
a) The direction of the magnetic field in the center of a coil is parallel to the axis of the coil.
- How is a magnetic particle indication formed around a crack in a piece of steel?
a) A flux is induced in the steel parallel to the crack.
b) An electric current is made to flow along the crack.
c) The part is placed inside a coil with the crack parallel to the axis of the coil.
d) An induced flux transverse to the crack allows poles to form at the crack faces.
e) All external fields are disturbed by the presence of the crack.
d) An induced flux transverse to the crack allows poles to form at the crack faces.
- Select the correct statement. Which of the following techniques is most likely to detect a longitudinal surface crack lying along the fusion boundary of a weld?
a) A DC yoke should be placed along the weld to detect fusion boundary cracks.
b) An AC yoke should be placed along the weld to detect fusion boundary cracks.
c) An AC yoke should be placed across the weld to detect fusion boundary cracks.
d) The prods should be placed across the weld to detect fusion boundary cracks.
e) The part placed inside a coil with the weld parallel to the coil axis.
c) An AC yoke should be placed across the weld to detect fusion boundary cracks.
- What is the effect of increasing the contact tip-to-work distance (CTWD) on the deposition rate in submerged arc welding (SAW)?
a) Increasing the CTWD has no effect on the deposition rate.
b) Increasing the CTWD decreases the deposition rate due to reduced arc energy and penetration.
c) Increasing the CTWD increases the deposition rate due to resistance heating in the electrode extension.
d) Increasing the CTWD increases the deposition rate until a certain point, after which it causes the arc to wander unpredictably.
c) Increasing the CTWD increases the deposition rate due to resistance heating in the electrode extension.
- Which of the following statements is correct regarding the storage and handling of cellulosic and low-hydrogen electrodes?
a) Both cellulosic and low-hydrogen electrodes should be stored in holding ovens to prevent moisture absorption.
b) Cellulosic electrodes should be stored in holding ovens, while low-hydrogen electrodes should be kept in their original packaging.
c) Low-hydrogen electrodes should be stored in holding ovens to maintain low moisture content, while cellulosic electrodes should not be placed in ovens but stored in their original containers.
d) Both cellulosic and low-hydrogen electrodes should be re-baked regularly to ensure optimal performance.
c) Low-hydrogen electrodes should be stored in holding ovens to maintain low moisture content, while cellulosic electrodes should not be placed in ovens but stored in their original containers.
- Which shielding gas does GMAW use for spray transfer?
a) 100% Carbon Dioxide (CO2)
b) 100% Helium (He)
c) A mixture of Argon (Ar) and 1%-5% Oxygen (O2)
d) A mixture of Argon (Ar) and 5% Carbon Dioxide (CO2)
d) A mixture of Argon (Ar) and 5% Carbon Dioxide (CO2)
- A dark, narrow area about 2-3 mm wide appears on a radiograph of a double vee groove weld along the edge of the area representing the weld. What does this dark area most likely represent?
a) Lack of side wall fusion
b) Incomplete penetration
c) Undercut
d) Slag entrapment
e) Weld metal crack
c) Undercut
- When radiographing a pipe with the source inside, give one reason why the source might not be placed at the center.
a) The source is always placed at the center.
b) To increase the source-to-film distance
c) To reduce exposure times
d) To reduce the number of shots required
e) The source is never placed inside.
b) To increase the source-to-film distance
- What happens to a sound wave when it travels into a different media?
a) The frequency changes.
b) The wavelength changes.
c) The decibels increase.
d) The waves are refracted.
d) The waves are refracted.
- What is the typical frequency for ultrasonic testing of welds on steel?
a) 2.25 Khz.
b) 2.25 Mhz.
c) 25.0 Khz.
d) 25.0 Mhz.
e) 225 Hz.
b) 2.25 Mhz.
- The yield strength (YS) is given by:
a) 80% of maximum load divided by the cross-sectional area.
b) The load at the breaking point is divided by the cross-sectional area.
c) The yield point load is divided by the cross-sectional area.
d) The maximum load divided by the cross-sectional area.
c) The yield point load is divided by the cross-sectional area.
- The ability of a liquid to penetrate a narrow opening depends on the phenomenon of:
a) Fluorescence.
b) Capillary action.
c) Density.
d) Viscosity.
e) Lipophilic.
b) Capillary action.
- In Steels, a small grain size will:
a) Changes the atomic arrangement from FCC to BCC.
b) Decrease the strength and toughness.
c) Increase the strength and toughness.
d) Decrease the carbon content.
e) Affect the chemical analysis.
c) Increase the strength and toughness.
- At what point does the carbon content indicate that the material is no longer steel but cast iron?
a) Beyond 1.7%
b) Beyond 17%
c) Beyond 7.1%
d) Beyond 0.71%
e) Beyond 0.17%
a) Beyond 1.7%
- One of the causes of hot shortness in steel is the presence of:
a) High Cobalt
b) High Chromium
c) High Manganese
d) High Sulphur
e) High Silicon
d) High Sulphur
- Which of the following is an example of an indication not associated with a discontinuity in a welded component?
a) A crack detected at the toe of the weld.
b) A shadow indication from a tight gap between a backing bar and the plate.
c) Porosity found within the weld bead.
d) Slag inclusions visible on the surface of the weld.
e) Lack of fusion along the weld interface
b) A shadow indication from a tight gap between a backing bar and the plate.
- MP can not be used on what types of materials?
a) Non-magnetic materials
b) Austenitic Stainless Steel
c) Aluminum
d) Copper
e) Plastic
f) Non-ferrous Metals
g) All the above
g) All the above
- How do you measure the size of a flare-groove weld?
a) Leg length.
b) Face width.
c) Depth of bevel.
d) Length of the weld.
b) Face width.
- CSA G-40.21M designation, type 350WT steel specifies weldable steel?
a) Where low temperature toughness is a prime consideration.
b) Where high temperature deafness is a prime concern.
c) That had been quenched and tempered.
d) That has not been quenched but has been tempered.
a) Where low temperature toughness is a prime consideration.
- A ____ is raised portion on the surface caused by a gas bubble?
a) Pit.
b) Scab.
c) Blister.
d) Seam.
c) Blister.
