Product Design: Joining methods Flashcards
List three temporary joints.
- Nut and Bolt assembly.
- Wood and Self-tapping screws.
- Modesty block.
What nuts are used with self-tapping screws.
spring steel captive nuts.
Describe knock down fittings.
Knock-down fittings are those that can be put together easily, normally using only a screw driver, a drill, a mallet/hammer and other basic tools. They are temporary joints although many are used to permanently join together items such as cabinets and other pieces of furniture that are purchased in a flat pack.
Describe temporary joining methods.
Temporary joining methods are those that do not damage the materials being joined when the joint is undone.
Describe permanent joining methods.
Permanent joining methods are those that cause damage to the materials when they are dismantled
List three permanent joints.
- Welding
- Soldering
- Adhering
List the fittings that are categorised as “screws”.
Nuts and Bolts,
Self-tapping screws,
Captive nuts.
List the fittings that are categorised as “Knock-down fittings”.
Cam fittings,
Captive nuts,
Corner blocks.
What are tacks and nails used for?
Wood,
Upholstery,
Masonry.
List three wood joints.
Comb joints,
Dovetail joints,
Mortise and tenon joints.
List the different Adhesives.
PVA,
Tensol,
Epoxy resins,
Double sided (tapes, pads etc.).
What fittings are classed as mechanical joints?
Rolled and crimped edges,
Slot and hook mechanisms,
Velcro
Tab and slot mechanisms.
What are the two types of riveting?
Pop,
Solid.
What are the two types of soldering?
Hard (silver solid),
Soft solder.
What chemicals are used in brazing?
Oxy-acetylene
What are the types of welding?
Spot, Electric arc, MIG (metal inert gas), TIG (tungsten inert gas), Oxy-acetylene.
What joining methods are used for fabrics?
Sewing and stitching.
Which joining methods involve forming?
Seam joints,
crimped joints.
Describe a seam joint.
Seams joints are created by two folded edged being forced together under high pressure.
Describe a crimped joint.
The base of the joint is crimped and a second piece is forced into the crimped section. The two sides are then forced together under high pressure.
Which processes involve heat?
Welding,
Brazing,
Soldering.
What are Hard solders used for?
Hard solders are used for products requiring additional strength in the construction of products requiring the soldering of a number of mating components.
What are soft solders used for?
Soft solders are used for joining electronic components to circuit boards, or for small copper or brass components.
