topic 3.4

Question 1

What are the three broad categories of joining techniques?

Answer 1

Mechanical joining, Adhesive bonding, Thermal joining

These categories encompass various methods used in joining materials.

Question 2

Fill in the blank: _______ are threaded fasteners, usually with a matching nut or into a tapped hole.

Answer 2

Screws

Screws are commonly used in furniture, electronics, and machinery.

Question 3

What are the advantages of using bolts and nuts?

Answer 3

Strong, adjustable, reusable

Bolts and nuts are commonly used for structural connections and machines.

Question 4

What is a disadvantage of using rivets?

Answer 4

Not reusable, requires special tools

Rivets are often used in aircraft and appliances.

Question 5

List two uses of nails.

Answer 5

• Carpentry
• Framing

Nails are simple pins hammered into wood or soft materials.

Question 6

What is a common use for staples?

Answer 6

Upholstery, paper fixing

Staples are U-shaped fasteners that are pressed into material.

Question 7

What type of joint is formed by flexible tabs that snap into a groove or slot?

Answer 7

Snap fits

Snap fits are commonly used in plastic parts, toys, and clips.

Question 8

True or False: Tongue and groove joints are common in wood flooring.

Answer 8

True

This type of joint fits edges tightly together.

Question 9

What are the properties of PVA (Polyvinyl Acetate) adhesives?

Answer 9

Water-based, dries clear, good for wood

PVA adhesives are widely used in woodworking, paper, and fabric.

Question 10

List two advantages of using adhesives.

Answer 10

• Can join different materials
• Provide airtight or watertight seals

Adhesives distribute stress over large areas and require no mechanical damage.

Question 11

What is one disadvantage of adhesives?

Answer 11

Some adhesives take time to cure

This can limit their effectiveness in time-sensitive applications.

Question 12

Fill in the blank: _______ joins metals by melting base materials and adding filler material.

Answer 12

Welding

Welding is used in automotive and construction industries.

Question 13

What is the difference between soldering and brazing?

Answer 13

Soldering uses a filler metal with a low melting point; brazing uses higher temperatures

Both methods are used to join metals, with brazing providing stronger joints.

Question 14

What is the purpose of tacking in joining methods?

Answer 14

Temporary joining, e.g. welding tack

Tacking is used to hold pieces during fabrication.

Question 15

What are two factors affecting the choice of joining method?

Answer 15

• Material type
• Load and stress

Different methods are better suited for various materials and load requirements.

Question 16

What is a consideration regarding environmental resistance in joining methods?

Answer 16

Waterproof or corrosion resistance needed?

This is crucial for determining the durability of the joint in specific environments.