Session 1.40 PowerPoint Joining

Question 1

What is the difference between temporary and permanent joints?

Answer 1

Temporary joints can be removed without damage (e.g., screws, bolts), while permanent joints cannot (e.g., nails, rivets, welding).

Question 2

What are pop rivets mainly used for?

Answer 2

Joining thin sheet metals and other thin materials from one side.

Question 3

Why are screws considered stronger than nails?

Answer 3

Their threads grip the wood fibres, making joints stronger and allowing removal without damage.

Question 4

What is the purpose of a spanner?

Answer 4

To grip and tighten or loosen nuts and bolts.

Question 5

What is a hot glue gun used for in engineering and craft?

Answer 5

To quickly bond materials with thermoplastic adhesive that sets in seconds.

Question 6

How does soldering create a joint?

Answer 6

By melting solder (a low melting point alloy) to permanently bond metals together.

Question 7

What is the main function of washers when used with nuts and bolts?

Answer 7

To spread the load, protect surfaces, and prevent vibration loosening.

Question 8

Give two examples of adhesives and their uses.

Answer 8

• PVA – woodworking
• Epoxy resin – construction and laminates

Question 9

What is MIG welding and how does it work?

Answer 9

Metal Inert Gas welding uses a filler wire and shielding gas fed through a torch to fuse metals.

Question 10

How does TIG welding differ from MIG welding?

Answer 10

TIG uses a non-consumable tungsten electrode to create a weld pool, while MIG uses a consumable wire as filler.