Joining Techniques

Question 1

What is an adhesive?

Answer 1

Used to stick materials together

Question 2

What are the 6 types of adhesive?

Answer 2

Contact adhesive
Acrylic cement
Epoxy resin
Polyvinyl acetate
Hot melt glue
Cyanoacrylate (superglue)
Polystyrene cement

Question 3

What is contact adhesive used for?

Answer 3

Bonding large areas such as sheet materials together

Question 4

How is contact adhesive used?

Answer 4

Coat in adhesive
Left until tacky feel
Adhesion is onstant

Question 5

What is acrylic cement used for?

Answer 5

Join polymers together

Question 6

How is acrylic cement used?

Answer 6

Softens the surface of polymers allowing them to fuse

Question 7

What is epoxy resin used for?

Answer 7

Joins different materials together like timber to metal

Question 8

How is epoxy resin applied?

Answer 8

Two part adhesive, resin and hardener, mixed together in equal parts

Question 9

What is PVA used for?

Answer 9

Bond wood joints

Question 10

How is PVA used?

Answer 10

White clear water based adhesive
Left to dry after applied with brush

Question 11

How is hot melt glue used?

Answer 11

Via a glue gun which melts the glue stick

Question 12

What is hot melt glue used for?

Answer 12

Paper and boards
Commonly used in model making or to keep wires in place in electronics

Question 13

What is cyanoacrylate used for?

Answer 13

Different materials like plastic to metal

Question 14

How cyanoacrylate work?

Answer 14

Fast acting, best when in contact with moisture to create a very tight instant bond

Question 15

Risks of cyanoacrylate.

Answer 15

Can instantly bond skin together

Question 16

What is polystyrene cement used for?

Answer 16

Join rigid polystyrene polymers
Model making assembly ktis

Question 17

How does polystyrene cement work?

Answer 17

Softens surface of polymers allowing them to fuse when cement hardens
Not instant so needs to be left to dry

Question 18

Mechanical joining methods

Answer 18

Screws
Nuts and bolts
Rivets
Press joining

Question 19

What method of joining enables repair?

Answer 19

Nuts and bolts

Question 20

What are four types of heat joining?

Answer 20

Oxy-acetylene welding
MIG welding
Brazing (hard soldering)
Soft soldering

Question 21

How does oxy-acetylene welding work?

Answer 21

Uses a steel filler rod to create the weld
Does not require electricity
Mig welding commonly used instead

Question 22

What is oxy-acetylene used for?

Answer 22

Quick repair jobs in remote locations (as no need for electricity supply needed)
Welds mild steel sheet, tube or plate

Question 23

How does MIG welding work?

Answer 23

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

Question 24

What is MIG welding used for?

Answer 24

Thin gauge metals, medium carbon steel or aluminium
Climbing frames
Bike frames
Joining tubular steel

Question 25

How does brazing work?

Answer 25

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

Question 26

What is brazing used for?

Answer 26

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

Question 27

What is soft soldering used for?

Answer 27

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

Question 28

How does soft soldering work?

Answer 28

Uses a filler rod to flow between metal surfaces to create the join