fml 5 Flashcards
The strength of the magnetic field, and therefore the pinch effect, depends mostly on: (Multiple Choice)
Question options:
A) current density.
B) voltage and wire size.
C) travel speed.
D) arc length.
A) current density.
GTAW electrodes may be ground to the shape of a cone. What is the effect of a large vertex angle on weld bead width? (Multiple Choice)
Question options:
A) The bead width is reduced
B) The bead width is increased
C) The is no effect
D) The bead width becomes irregular
A) The bead width is reduced
The two systems that can be used to adjust the output of a transistor welding power source are: (Multiple Choice)
Question options:
A) tapped transformer and SCR.
B) SCR and inverter.
C) frequency and pulse width modulation.
D) peak voltage and current feedback.
D) peak voltage and current feedback.
Can you use solid welding wires without copper coating? (Multiple Choice)
Question options:
A) Yes
B) No
A) Yes
In what application is back-stepping or the skip welding technique normally applied ? (Multiple Choice)
Question options:
A) Fillet welding
B) Spot welding
C) Heavy plate welding
D) Ship building or in large fuel tanks
D) Ship building or in large fuel tanks
Is there any thermal expansion on mild steel after 800 °C? (Multiple Choice)
Question options:
A) Not much
B) A lot
C) Steel actually shrinks
D) Steel expands exponentially
A) Not much
Which elements are added to molten steel specifically for deoxidation purposes? (Multiple Choice)
Question options:
A) Manganese and oxygen
B) Silicon and oxygen
C) Manganese and aluminum
D) Carbon and manganese
C) Manganese and aluminum
Elements commonly used to form substitutional solid solutions include: (Multiple Choice)
Question options:
A) nitrogen.
B) carbon.
C) copper.
D) oxygen.
C) copper.
The most predominant cracking in high strength low alloy steel (HSLA) is in the: (Multiple Choice)
Question options:
A) heat-affected zone.
B) weld metal zone.
C) either zones.
D) None of the above
B) weld metal zone.
Since creep failure is a condition that occurs at grain boundaries, what aspect of these grain boundaries increases creep strength? (Multiple Choice)
Question options:
A) Smaller grain size improves creep strength by increasing grain boundary area.
B) Grains must be orientated in all directions
C) Grain boundaries that contain voids will cause relaxation and improve creep strength
D) Larger grain size improves creep strength by reducing grain boundary area.
D) Larger grain size improves creep strength by reducing grain boundary area.
High energy input welds typically result in: (Multiple Choice)
Question options:
A) large ASTM grain size numbers.
B) small ASTM grain size numbers.
C) elongated grains.
D) thin grains.
B) small ASTM grain size numbers.
Stainless steels acquire their special properties because of the presence of: (Multiple Choice)
Question options:
A) more than 10% nickel.
B) more than 7% chromium.
C) more than 10% chromium.
D) more than 3% molybdenum.
C) more than 10% chromium.
Sensitization in the HAZ of an AISI 304 austenitic stainless steel can be caused by: (Multiple Choice)
Question options:
A) the formation of small copper precipitates during slow cooling.
B) the formation of titanium or tantalum carbides.
C) the formation of chromium carbides.
D) a solution heat treatment.
C) the formation of chromium carbides.
Which of the following phases is the least prone to hydrogen-induced cold cracking (HICC)? (Multiple Choice)
Question options:
A) Martensite
B) FCC austenite
C) Bainite
D) BCC ferrite
B) FCC austenite
Is it good practice to have more or less chromium in the welding electrode compared to the base metal? (Multiple Choice)
Question options:
A) It all depends on the welder
B) There should always be less chromium
C) There should always be more chromium
D) No, it is not good practice
C) There should always be more chromium
The strength of the 200 series of stainless steels is increased by the addition of: (Multiple Choice)
Question options:
A) nickel.
B) chromium.
C) carbon.
D) nitrogen.
E) manganese.
D) nitrogen.
What is the bend test used for? (Multiple Choice)
Question options:
A) Testing welding procedures and material toughness
B) Measuring the elasticity of steel
C) Evaluating the ductility and strength of steel
D) Testing of welders and welding procedures
C) Evaluating the ductility and strength of steel
Charpy impact tests provide comparative data that can be used for: (Multiple Choice)
Question options:
A) defining the fracture toughness of different materials.
B) qualification or quality control checks on materials.
C) determining the strength of different materials.
D) qualification of welder, tack welder, and welding operators.
C) determining the strength of different materials.
Visible dye and fluorescent dye are further categorized by: (Multiple Choice)
Question options:
A) dwell times.
B) method of application.
C) method of removal.
D) viscosity.
A) dwell times.
Eddy current reveals which kind of discontinuities? (Multiple Choice)
Question options:
A) Surface only
B) Subsurface only
C) Surface and subsurface
D) Those comparable to UT
C) Surface and subsurface
In conventional ultrasonic theory, the wave is injected into the specimen as a: (Multiple Choice)
Question options:
A) continuous wave at the natural frequency of the transducer.
B) short pulse containing several oscillations at the natural frequency.
C) long pulse containing several oscillations at the natural frequency.
D) mechanical vibration.
B) short pulse containing several oscillations at the natural frequency.