Joining Techniques Flashcards
What is an adhesive?
Used to stick materials together
What are the 6 types of adhesive?
Contact adhesive
Acrylic cement
Epoxy resin
Polyvinyl acetate
Hot melt glue
Cyanoacrylate (superglue)
Polystyrene cement
What is contact adhesive used for?
Bonding large areas such as sheet materials together
How is contact adhesive used?
Coat in adhesive
Left until tacky feel
Adhesion is onstant
What is acrylic cement used for?
Join polymers together
How is acrylic cement used?
Softens the surface of polymers allowing them to fuse
What is epoxy resin used for?
Joins different materials together like timber to metal
How is epoxy resin applied?
Two part adhesive, resin and hardener, mixed together in equal parts
What is PVA used for?
Bond wood joints
How is PVA used?
White clear water based adhesive
Left to dry after applied with brush
How is hot melt glue used?
Via a glue gun which melts the glue stick
What is hot melt glue used for?
Paper and boards
Commonly used in model making or to keep wires in place in electronics
What is cyanoacrylate used for?
Different materials like plastic to metal
How cyanoacrylate work?
Fast acting, best when in contact with moisture to create a very tight instant bond
Risks of cyanoacrylate.
Can instantly bond skin together
What is polystyrene cement used for?
Join rigid polystyrene polymers
Model making assembly ktis
How does polystyrene cement work?
Softens surface of polymers allowing them to fuse when cement hardens
Not instant so needs to be left to dry
Mechanical joining methods
Screws
Nuts and bolts
Rivets
Press joining
What method of joining enables repair?
Nuts and bolts
What are four types of heat joining?
Oxy-acetylene welding
MIG welding
Brazing (hard soldering)
Soft soldering
How does oxy-acetylene welding work?
Uses a steel filler rod to create the weld
Does not require electricity
Mig welding commonly used instead
What is oxy-acetylene used for?
Quick repair jobs in remote locations (as no need for electricity supply needed)
Welds mild steel sheet, tube or plate
How does MIG welding work?
Uses an electrode wire with an inert cad like CO2 or argon
Suitable for thin gauge metal because heat generated is localised to small area and will not burn through metal or distort surround area
What is MIG welding used for?
Thin gauge metals, medium carbon steel or aluminium
Climbing frames
Bike frames
Joining tubular steel
How does brazing work?
Brass filler rod using either oxyacetylene or a gas/ compressed air brazing hearth
Joins dissimilar metals like mod steel sheet to aluminium
Lower temp than MIG welding so suitable for thinner gauge metals but not as strong as a joint
What is brazing used for?
Lower temp so suitable for joining thinner gauge mild steel tube or bar
Suitable for one off or small batch
Steel framework for small furniture, ornamental light etc
What is soft soldering used for?
Joins copper or brass for light use applications
Lower temp than brazing joins copper wiring in plumbing, jewellery, brass musical instruments and electrical components
Melting point of filler lower than that of metal being soldered
How does soft soldering work?
Uses a filler rod to flow between metal surfaces to create the join
