Design - Joining Techniques Flashcards

1
Q

what is the difference between a temporary joint and a permanent joint?

A

Temporary joints can be removed easily (such as a screw, nuts and bolts and knock down joints)
Permanent joints cannot be removed without damage to the product (eg. glue, rivets, welding, wood joints)

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2
Q

What types of wood joints are there?

A

Butt joint- weak joint but quick an easy
Lapp joint - stronger than butt joint due to higher surface area
Dowel (connected with wooden pegs)
Mortise and Gauge - Fits into cut hole
Finger/ dovetail joints - interlocking strong joints

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3
Q

What is a pop-rivet?

A

The joining of two thin materials using a rivet gun.

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4
Q

What are the 3 types of heating joints?

A

Soldering
Brazing
Welding

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5
Q

What is soldering?

A

Melting alloy with higher melting point to join other materials
FLUX is often used before connecting to prevent oxidation

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6
Q

What is brazing?

A

Similar to soldering however using higher temperatures

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7
Q

What is welding?

A

Strongest heating joint where edges are melted to connect to each other
Any gaps are filed with filler

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8
Q

What are 3 examples of adhesives?

A

PVA glue
Epoxy Resin
Liquid Solvent Cement

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9
Q

What are the properties of PVA Glue?

A
  • Not fully waterproof
  • Flexible
  • Does not emitt odours
  • Joins Wood, vinyl or paper
  • Takes 24hrs to fully dry
  • Turns clear when dry
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10
Q

What are the properties of EPOXY RESIN?

A
  • Strong
  • Low shrinkage
  • Low cost and toxicity
  • Works well for plastics , aluminium and glass
  • 24 hrs to dry
  • Very strong
  • Requires the mix of two different parts to a 1:1 ratio to be activated
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11
Q

What are the properties of liquid solvent cement?

A
  • highly flammable
  • Can be toxic if ingested
  • Brush to apply
  • Dries very quickly (2hrs)
  • Good for sticking plastics together
  • Strong bond
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