Joining & Assembly Flashcards
Joining
Putting 2+ parts together
Assembly
Sequence of multiple joinings
Joining Subprinciples (5)
Welding
Brazing & soldering
Adhesive bonding
Mechanical
Joining using form
Common joint geometries (6)
Butt
Corner
Lap
Tee
Sleeve
Edge
Welding
Aligning two parts and locally heating interface to form joint
Generally only joins similar materials
Welding Disadvantages
Considerable residual stress
Can undo any prior benefits from work hardening or Heat Treatment
Can cause oxidation
Welding Methods – Metals (5)
Oxy-acetylene gas welding: good in thin low carbon steels
Tungsten-inert-gas: Good for thin sheets and tubes of Al, Mg, & Ti
Resistant Spot Welding: fast but not very strong
Laser Welding: mostly low carbon steel
Friction Stir Welding
Welding Methods – Plastics (2)
Ultrasonic welding
Hot Plate welding
What is Brazing/Soldering?
Filler metal applied locally on parts needed to be joined and then melted
Brazing – Above 450 dg C
Soldering – Below 450 dg C
Brazing Methods(2)
Strong
Torch Blazing
Furnace Brazing
Soldering Methods
Weak
Used for creating electrically conductive joints
Adhesive Bonding (4)
Drying adhesive
Multi-component reactive adhesives
Single-component reactive adhesives
Hot Melts
What is mechanical fastening?
Uses 2 separate components to create mechanical joints
no heat, no prep, and can be removed
Types of Mechanical Fasteners (3)
Bolts
Screws
Rivets
Form Closures & categories
Require no heat, chemicals, or additional materials
Elastic & plastic
