120102i Hardfacing Flashcards
What does the term hardfacing mean?
a) the application of an alloy that assists corrosion
b) to weld together parts that have been quenched
c) to apply a layer of material that combats wear
d) to apply material that is difficult to use
c) to apply a layer of material that combats wear
Machinery parts that are subjected to wear can have their service life prolonged by:
a) welding with alloy electrodes.
b) hardfacing the wear surface.
c) repairing the parts often.
d) using the equipment sparingly.
b) hardfacing the wear surface.
What is a major advantage of hardfacing?
a) Worn parts with high replacement costs can be reclaimed.
b) Hardfacing filler alloys are cheap and easy to apply.
c) Any hardfacing alloy can be used with any welding process.
d) The very hard alloys can also withstand high impact loading.
a) Worn parts with high replacement costs can be reclaimed.
Which arc welding process is very popular for hardfacing because of its low
equipment cost, versatility and general ease of application?
a) GMAW
b) SMAW
c) GTAW
d) FCAW
b) SMAW
Which method of hardfacing process is the slowest?
a) SMAW
b) FCAW
c) GMAW
d) GTAW
d) GTAW
What is a disadvantage of the FCAW surfacing process as compared to GMAW surfacing?
a) It produces slag, which may have to be removed.
b) Alloys cannot be added to the wires.
c) The cored electrode can only be used on a small radius.
d) The equipment is much more expensive.
a) It produces slag, which may have to be removed.
What is the advantage of the MCAW surfacing process compared to the FCAW surfacing process?
a) The deposition rates are similar.
b) Special equipment is required.
c) Alloys cannot be added to the wires.
d) It produces little to no slag.
d) It produces little to no slag.
Which arc welding surfacing method uses high currents and high deposition rates, leaves no spatter and emits no harmful ultraviolet radiation?
a) SMAW
b) OAW
c) SAW
d) FCAW
c) SAW
Which is true of the oxy fuel gas hard surfacing process?
a) You can surface only large areas.
b) The base metal does not have to be clean.
c) It has a higher deposition rate than arc surfacing processes.
d) It has low base metal dilution.
d) It has low base metal dilution.
Which statement describes thermal spray surfacing?
a) The flame carburizes the surface so that the rod can be melted onto it.
b) The constricted arc is forced between the electrode and the workpiece.
c) The electrode is continuous, and the arc is covered with a flux.
d) It heats a metallic or non-metallic material and propels it toward the object.
d) It heats a metallic or non-metallic material and propels it toward the object.
A sliding/scraping type of wear that removes metal by gouging or grinding is called:
a) erosion.
b) abrasion.
c) corrosion.
d) impact.
b) abrasion.
A gouging type of wear that washes away or grooves out the metal surface is called:
a) corrosion.
b) oxidation.
c) erosion.
d) abrasion.
c) erosion.
A seizing or galling type of wear that rips and tears out portions of a metal surface is called:
a) abrasion.
b) metal to metal.
c) erosion.
d) compression.
b) metal to metal.
The type of wear that pits, perforates and eventually dissolves metal is called:
a) thermal shock.
b) abrasion.
c) erosion.
d) corrosion.
d) corrosion.
A special form of corrosion that results in the crumbling or flaking off of a metal surface is called:
a) erosion.
b) oxidation.
c) metal to metal.
d) compression.
b) oxidation.
