Lectures 5-6 Processes Flashcards
Few disadvantages of creating a product out of one piece
- Storage is difficult
- Repair and replacement can be difficult
- Complex design
- Inefficient use of materials
- Transporting is difficult
What determines the selection of a joining process
- The materials being similar or dissimilar
Adhesives and solder require the surfaces for joining to be ——
wettable
When parts are to be joined what must be considered on the melting and heating temperatures of the materials?
- The upper limit
- Degradation when heated
Example of mechanical fastening
Riveting
Example of permanent joining
Welding
Example of adhesive bonding
Gluing
Three categories of joining methods
- Mechanical fastening
- Permanent joining
- Adhesive bonding
Mechanical assembly methods are useful because…. (2)
- Ease of assembly
- Ease of disassembly
A fastening method that allows for easy disassembly
Threaded fasteners
Screws and bolts are threaded ——
externally
A nut is an —– threaded fastener
internally
When the second head is formed on a rivet, what is that process carried out on the metal called?
Upsetting
4 positives of rivets
- High production rates
- Simplicity
- Dependability
- Low cost
Three tooling methods for rivets
- Impact
- Steady compression
- Impact and steady compression combo
DFA is
design for assembly
When DFA, what two things should you aim to do
- design with as few parts as possible
- design remaining parts so they are easily assembled
Is quality control a positive or negative for fasteners? Why?
Postive, allows for easy inspection and QC checks during assembly process
Faying surfaces are
the surfaces of the two parts that are in contact at a weld
Welding can be carried out through the use of —– or ——
heat, pressure
In welding, what may be added to facilitate coalescence?
A filler
Welding does not allow for ——- ——-
convenient disassembly
Welding is a dangerous process because
they involve high energy and uses electric current
Welding can reduce the strength of of the joint due to….
difficulty in seeing or detecting quality defects below the surface
