3.1 State whether steel is heated either below or above the critical temperature during the following heat-treatment processes:
3.1.1 Hardening
3.1.2 Tempering
3.1.3 Normalising
3.2 The hardness of a sampled work piece is tested using a drill press - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2024 - Paper 1
Question 3
3.1 State whether steel is heated either below or above the critical temperature during the following heat-treatment processes:
3.1.1 Hardening
3.1.2 Tempering
3.1.... show full transcript
Worked Solution & Example Answer:3.1 State whether steel is heated either below or above the critical temperature during the following heat-treatment processes:
3.1.1 Hardening
3.1.2 Tempering
3.1.3 Normalising
3.2 The hardness of a sampled work piece is tested using a drill press - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2024 - Paper 1
Step 1
3.1.1 Hardening
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Answer
Above
Step 2
3.1.2 Tempering
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Answer
Below
Step 3
3.1.3 Normalising
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Answer
Above
Step 4
3.2 The hardness of a sampled work piece is tested using a drill press. Which TWO aspects should be observed on the cutting chips?
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Answer
The chips heating colour
The chips curl
Step 5
3.3 Besides the machinability test, name THREE other tests used to determine the different types of steels.
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Answer
Sound test
Hardness test
Density test
Step 6
3.4 Name TWO quenching methods used for case-hardening.
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Answer
Carburising
Nitriding
Step 7
3.5 How can the temperature of a work piece be determined during the heat-treatment process?
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Answer
The temperature can be determined using a pyrometer, visually inspecting the metal, or using crayons.
Step 8
3.6 State the THREE basic steps that are involved in all heat-treatment processes according to a time-temperature cycle.
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