3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2023 - Paper 1
Question 3
3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends.
3.2 State ONE property of metals that can be determined by EACH of th... show full transcript
Worked Solution & Example Answer:3.1 Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2023 - Paper 1
Step 1
Give ONE reason why the lengths of metals are normally marked or colour-coded at the ends.
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Answer
Metal lengths are marked or colour-coded at the ends to identify the type of metal. This helps in determining the metal’s characteristics and appropriate applications.
Step 2
State ONE property of metals that can be determined by the Sound test.
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Answer
The sound test can determine the hardness of a metal, as different hardness levels produce different sound qualities when struck.
Step 3
State ONE property of metals that can be determined by the Bending test.
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Answer
The bending test can determine the ductility of metals, which measures how much a metal can deform before breaking.
Step 4
State ONE property of metals that can be determined by the Machining test.
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Answer
The machining test can determine the hardness of a metal, as harder metals will present more resistance during machining.
Step 5
Why is metal soaked in heat when performing heat-treatment processes?
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Answer
Metal is soaked in heat during heat-treatment processes to ensure uniform heat distribution throughout the metal, which helps in altering its properties and achieving a consistent grain structure.
Step 6
State TWO methods of conducting case hardening.
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Answer
Two methods of conducting case hardening are:
Carburising
Nitriding
Step 7
Explain how steel is annealed during heat-treatment processes.
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Answer
Steel is annealed by heating it slightly above the upper critical temperature (Ac3), soaking it for a specific period, and then slowly cooling it back to room temperature. This process relieves internal stresses and refines the grain structure.
Step 8
Name TWO quenching mediums that rapidly cool metal after heat-treatment processes.
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Answer
Two quenching mediums that rapidly cool metal are:
Brine or Salt water
Oil
Step 9
Which heat-treatment process follows the hardening process of a metal?
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Answer
The heat-treatment process that follows the hardening process of a metal is tempering.
