The diagram below shows the cutting nozzle of a plasma-cutting machine that is used to cut stainless steel - NSC Agricultural Technology - Question 4 - 2022 - Paper 1
Question 4
The diagram below shows the cutting nozzle of a plasma-cutting machine that is used to cut stainless steel.
4.1.1 Identify part A.
4.1.2 Identify the problem indic... show full transcript
Worked Solution & Example Answer:The diagram below shows the cutting nozzle of a plasma-cutting machine that is used to cut stainless steel - NSC Agricultural Technology - Question 4 - 2022 - Paper 1
Step 1
Identify part A.
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Answer
Part A is identified as the cutting nozzle.
Step 2
Identify the problem indicated by arrow B that can occur when thick materials are cut with the plasma-cutting machine.
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The problem indicated by arrow B is that the angle of cut will not be square or 90 degrees.
Step 3
Suggest an action to address the problem identified in QUESTION 4.1.2.
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To address the problem, a machine can be used to grind the face square or the welding nozzle can be tilted at an angle to compensate for the problem.
Step 4
Name TWO types of gases that are commonly used in the plasma-cutting process.
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The two types of gases commonly used in the plasma-cutting process are regular air and argon.
Step 5
Name the TWO gases used during the oxyacetylene cutting process.
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The two gases used during the oxyacetylene cutting process are acetylene and oxygen.
Step 6
List the advantages of the use of the oxyacetylene apparatus over the plasma cutter.
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The advantages include:
No need for electricity.
Can be used to heat up work pieces.
Portable.
No electrical components.
Rust has no influence on the cutting process.
Easy to operate.
Step 7
Name the important safety measures to adhere to when working with the oxyacetylene cutting apparatus.
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Important safety measures include:
Ensure proper personal protective equipment is used.
Always check for leaks before use.
Make sure the work area is clear of flammable materials.
Step 8
Describe the process when replacing a worn welding tip.
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To replace a worn welding tip, first remove the welding shield cup, unscrew the damaged welding tip, screw the new tip on, and finally replace the welding cup.
Step 9
Explain the use of anti-spatter spray during the MIG welding process.
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Anti-spatter spray is used to prevent the sprout from clogging with welding metal and to stop the filler wire/welding electrode from sticking to the contact tip.
Step 10
Give FOUR reasons for the welding wire not running smoothly through the welding hose.
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Four reasons include:
Bended welding feeder hose.
Damage to the feeding mechanism.
Corroded welding electrode/wire.
Damaged tip.
Step 11
Complete the table by naming the preventative measures in QUESTIONS 4.4.1 to 4.4.3.
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The stable door dimensions should be 2000 mm x 1000 mm with two hinges and one latch attached. The design must incorporate square tubing, round bar, and mild steel plate as specified.
Step 13
Explain why a farmer would use an inverter welder powered by a generator rather than a MIG welder.
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An inverter welder is preferred as it is lightweight, compact, does not require a gas cylinder, and can operate in various conditions, making it ideal for field repairs.
