Marking of Metals

Question 1

What temporary marking aids are there?

Answer 1

• Pencils
• Crayons
• Felt/Fibre Tipped Pens
• Endorsing Inks

Question 2

Why are Metal Stamps shaped to produce a “U” shaped indent, rather than a “V”?

Answer 2

A “V” shape would cause high stress on the point and cause breakage easily.

Question 3

What 2 types of percussion tools are there for marking?

Answer 3

• Electric

- Pneumatic

Question 4

What is the fatal pressure of air?

Answer 4

4Psi+

Question 5

What2 materials are a marking stylus usually made of?

Answer 5

• Solid Carbide

- Carbide Tipped Steel

Question 6

When should Stamps and Vibratory Percussion Tools not be used?

Answer 6

• On aluminium alloy thinner than 20SWG (0.915mm)

- On highly stressed parts

Question 7

When and why should you not use Pencils and Crayons to mark items?

Answer 7

When the item in question is subject to high temperatures.

This is because they can leave a carbon deposit and lead to carbonisation and embrittlement.

Question 8

How would you mark small/fragile items?

Answer 8

Put the items in a bag/container and label.