MME 231 Quiz 3 Set – Study Guide, Practice Questions, and Revision Material for
Exam Preparation
Methods that allow for disassembly - ✔✔threaded fasteners
Methods that allow for assembly - ✔✔rivets
Clearance hole into which rivet is inserted must be - ✔✔close to the diameter of the rivet
Shrink fitting - ✔✔- external part is enlarged by heating and internal part is inserted
Expansion fitting - ✔✔- internal part is contracted by cooling and inserted into external part
When at room temperature, contraction or expansion - ✔✔creates interference fit
Snap Fits - ✔✔-Joining two parts in which mating elements possess a temporary interference
during assembly, but once assembled they interlock
During snap fits - ✔✔During assembly, one or both parts elastically deform to accommodate
the temporary interference
Stitching - ✔✔U shaped stitches formed one-at-a-time from steel wire and immediately driven
through parts (a) unclinched, (b) standard loop, (c) bypass loop, and (d) flat clinch
Stapling - ✔✔Preformed U-shaped staples are punched through the two parts to be attached
Lanced Tabs - ✔✔Lanced tabs to attach wires or shafts to sheet metal
, Seamed - ✔✔Edges of two separate sheet metal parts or the opposite edges of the same part
are bent over to form the fastening seam
Welding - ✔✔Joining process in which two (or more) parts are coalesced at their contacting
surfaces by application of heat and/or pressure
Advantages of Welding - ✔✔.Provides a permanent joint
.Usually the most economical way to join parts in terms of material usage and fabrication costs
.Mechanical fastening usually requires additional hardware (e.g., screws) and geometric
alterations of the assembled parts (e.g., holes)
Disadvantages of Welding - ✔✔.Most welding operations are performed manually and are
expensive in terms of labor cost
.Most welding processes utilize high energy and are inherently dangerous
.Welded joints do not allow for convenient disassembly
.Welded joints can have quality defects that are difficult to detect
Fusion Welding - ✔✔.Joining processes that melt the base metals
.a filler metal is added to the molten pool to facilitate the process and provide bulk and added
strength to the welded joint
Exam Preparation
Methods that allow for disassembly - ✔✔threaded fasteners
Methods that allow for assembly - ✔✔rivets
Clearance hole into which rivet is inserted must be - ✔✔close to the diameter of the rivet
Shrink fitting - ✔✔- external part is enlarged by heating and internal part is inserted
Expansion fitting - ✔✔- internal part is contracted by cooling and inserted into external part
When at room temperature, contraction or expansion - ✔✔creates interference fit
Snap Fits - ✔✔-Joining two parts in which mating elements possess a temporary interference
during assembly, but once assembled they interlock
During snap fits - ✔✔During assembly, one or both parts elastically deform to accommodate
the temporary interference
Stitching - ✔✔U shaped stitches formed one-at-a-time from steel wire and immediately driven
through parts (a) unclinched, (b) standard loop, (c) bypass loop, and (d) flat clinch
Stapling - ✔✔Preformed U-shaped staples are punched through the two parts to be attached
Lanced Tabs - ✔✔Lanced tabs to attach wires or shafts to sheet metal
, Seamed - ✔✔Edges of two separate sheet metal parts or the opposite edges of the same part
are bent over to form the fastening seam
Welding - ✔✔Joining process in which two (or more) parts are coalesced at their contacting
surfaces by application of heat and/or pressure
Advantages of Welding - ✔✔.Provides a permanent joint
.Usually the most economical way to join parts in terms of material usage and fabrication costs
.Mechanical fastening usually requires additional hardware (e.g., screws) and geometric
alterations of the assembled parts (e.g., holes)
Disadvantages of Welding - ✔✔.Most welding operations are performed manually and are
expensive in terms of labor cost
.Most welding processes utilize high energy and are inherently dangerous
.Welded joints do not allow for convenient disassembly
.Welded joints can have quality defects that are difficult to detect
Fusion Welding - ✔✔.Joining processes that melt the base metals
.a filler metal is added to the molten pool to facilitate the process and provide bulk and added
strength to the welded joint
