sources, origins, physical and working properties of materials, components, systems

Question 1

What is annealing?

Answer 1

• A metal heat treatment to finish and condition metal.
• Annealing – heating then slowly cooling the metal to remove stress, make softer and refine structure.

Question 2

What is normalising?

Answer 2

• A metal heat treatment to finish and condition metal.
• Normalising – heating and then cooling the metal at room temperature, reducing hardness and increasing ductility.

Question 3

What is case hardening?

Answer 3

• A metal heat treatment to finish and condition metal.
• Case hardening – This hardens an alloy’s surface by adding carbon, heating and quenching.

Question 4

What is tempering?

Answer 4

• A metal heat treatment to finish and condition metal.
• Tempering – applied to steel and cast iron, increasing toughness and reducing hardness and brittleness. Tempering involves heating to a high temperature and air-cooling.

Question 5

What is hardening?

Answer 5

• A metal heat treatment to finish and condition metal.
• Hardening – heating and then cooling the metal rapidly by submerging into a liquid or oil.

Question 6

How can you prevent shrinkage in wood?

Answer 6

Hardwoods and softwoods must be seasoned before use. This could be by kiln drying or air drying, to ensure all moisture is removed to prevent shrinkage