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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.
Answer
A plasma cutter operates by creating an electrical channel of ionized gas, known as plasma. This process begins when the plasma cutter initiates an electric arc that travels from an electrode to the work piece through a grounding clamp. A combination of compressed air is then directed through the nozzle, allowing the electric arc to focus and cut through the material at high speed. The resulting heat from the interaction of the arc and the metal slice melts the workpiece, enabling precision cutting.
Step 2
Step 3
Describe the internal thread-cutting process by using a thread-cutting tap.
Answer
The internal thread-cutting process involves several key steps:
- Drilling the Core Diameter: Begin by drilling a hole of the required diameter that will house the internal threads.
- Tapping with Three Taps: Use a set of three taps—taper, intermediate, and plug—in succession. The taper tap starts the threading process, followed by the intermediate tap to deepen the threads, and finally, the plug tap to finish the threading with high accuracy.
- Check Threads: After tapping, check the threads with a thread pitch gauge or bolt to ensure they meet the required specifications and are fully threaded.
Step 4
Describe the function of a power saw.
Answer
A power saw is primarily used for cutting sections of metal or other materials. It operates using a powered blade that rotates or moves back and forth, allowing for precise and efficient cuts. The design of the power saw allows it to handle various materials, enhancing versatility in construction and manufacturing.
Step 5
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Step 8
What is the purpose of the flashback arrestors on gas welding equipment?
Answer
The purpose of flashback arrestors is to prevent back feeding of flames into the gas supply line, effectively stopping any dangerous flashback that could result from a flame moving back into the equipment. This safety device is crucial for ensuring operational safety during gas welding activities.