6.1 Describe the working principles of a plasma cutter - NSC Mechanical Technology Welding and Metalwork - Question 6 - 2021 - Paper 1
Question 6
6.1 Describe the working principles of a plasma cutter.
6.2 State TWO uses of a hydraulic press.
6.3 Describe the internal thread-cutting process by using a thread... show full transcript
Worked Solution & Example Answer:6.1 Describe the working principles of a plasma cutter - NSC Mechanical Technology Welding and Metalwork - Question 6 - 2021 - Paper 1
Step 1
Describe the working principles of a plasma cutter.
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Answer
A plasma cutter works by creating an electrical channel of ionized gas (plasma) that flows from the cutter to the workpiece. It forms a completed electric circuit via a grounding clamp. Compressed air is blown through a focused nozzle at high speed, and a high-frequency electrical arc is formed within the gas between an electrode and the workpiece.
Step 2
State TWO uses of a hydraulic press.
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Answer
For removing bearings or bushes.
For shaping material.
Step 3
Describe the internal thread-cutting process by using a thread-cutting tap.
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Answer
The internal thread-cutting process involves drilling the required core diameter of the workpiece. Next, three taps are used in progressive order: starting with the taper tap, then the intermediate tap, and finally the plug tap. After tapping, a thread gauge or bolt should be checked to ensure the thread meets specifications.
Step 4
Describe the function of a power saw.
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Answer
A power saw is used primarily to cut sections of metal or other materials efficiently, ensuring precision and speed in the cutting process.
Step 5
Identify the component shown in FIGURE 6.5.
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Answer
Oxygen regulator / Acetylene regulator.
Step 6
Label parts A–D.
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Answer
A. Gauge
B. Outlet
C. Inlet
D. Pressure adjusting knob
Step 7
What is the colour code of an acetylene gas cylinder?
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Answer
Red / maroon.
Step 8
What is the purpose of the flashback arrestors on gas welding equipment?
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