Product Design: Joining methods

Question 1

List three temporary joints.

Answer 1

1. Nut and Bolt assembly.
2. Wood and Self-tapping screws.
3. Modesty block.

Question 2

What nuts are used with self-tapping screws.

Answer 2

spring steel captive nuts.

Question 3

Describe knock down fittings.

Answer 3

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.

Question 4

Describe temporary joining methods.

Answer 4

Temporary joining methods are those that do not damage the materials being joined when the joint is undone.

Question 5

Describe permanent joining methods.

Answer 5

Permanent joining methods are those that cause damage to the materials when they are dismantled

Question 6

List three permanent joints.

Answer 6

1. Welding
2. Soldering
3. Adhering

Question 7

List the fittings that are categorised as “screws”.

Answer 7

Nuts and Bolts,
Self-tapping screws,
Captive nuts.

Question 8

List the fittings that are categorised as “Knock-down fittings”.

Answer 8

Cam fittings,
Captive nuts,
Corner blocks.

Question 9

What are tacks and nails used for?

Answer 9

Wood,
Upholstery,
Masonry.

Question 10

List three wood joints.

Answer 10

Comb joints,
Dovetail joints,
Mortise and tenon joints.

Question 11

List the different Adhesives.

Answer 11

PVA,
Tensol,
Epoxy resins,
Double sided (tapes, pads etc.).

Question 12

What fittings are classed as mechanical joints?

Answer 12

Rolled and crimped edges,
Slot and hook mechanisms,
Velcro
Tab and slot mechanisms.

Question 13

What are the two types of riveting?

Answer 13

Pop,

Solid.

Question 14

What are the two types of soldering?

Answer 14

Hard (silver solid),

Soft solder.

Question 15

What chemicals are used in brazing?

Answer 15

Oxy-acetylene

Question 16

What are the types of welding?

Answer 16

Spot,
Electric arc,
MIG (metal inert gas), 
TIG (tungsten inert gas),
Oxy-acetylene.

Question 17

What joining methods are used for fabrics?

Answer 17

Sewing and stitching.

Question 18

Which joining methods involve forming?

Answer 18

Seam joints,

crimped joints.

Question 19

Describe a seam joint.

Answer 19

Seams joints are created by two folded edged being forced together under high pressure.

Question 20

Describe a crimped joint.

Answer 20

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.

Question 21

Which processes involve heat?

Answer 21

Welding,
Brazing,
Soldering.

Question 22

What are Hard solders used for?

Answer 22

Hard solders are used for products requiring additional strength in the construction of products requiring the soldering of a number of mating components.

Question 23

What are soft solders used for?

Answer 23

Soft solders are used for joining electronic components to circuit boards, or for small copper or brass components.