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4.1 Redraw the table below in your ANSWER BOOK - NSC Agricultural Technology - Question 4 - 2018 - Paper 1
Question 4
4.1 Redraw the table below in your ANSWER BOOK. Complete the table by comparing MIG welding with arc welding using the given headings. | HEADINGS ... show full transcript
Worked Solution & Example Answer:4.1 Redraw the table below in your ANSWER BOOK - NSC Agricultural Technology - Question 4 - 2018 - Paper 1
Step 1
4.2.1 Describe the function of the part shown above.
Answer
The part shown in the image is a wire feeder for MIG welding. Its primary function is to supply and control the feed of the welding wire to the weld area, ensuring a consistent and steady flow. This is crucial for maintaining an even weld and for achieving quality results in the welding process.
Step 2
4.2.2 Briefly describe FIVE safety measures that must be followed when welding with the MIG-welding machine.
Answer
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Remove all materials that can catch fire: Ensure the workspace is free from flammable materials to prevent accidental fires.
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Protect eyes by wearing a welding shield/screens: Always wear a welding helmet with the appropriate filter to protect your eyes from harmful UV and IR radiation.
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Wear gloves and protective clothing: Use fire-resistant gloves and clothing to shield your skin from sparks and heat.
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Ensure proper ventilation: Work in a well-ventilated area to avoid inhalation of harmful fumes.
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Prevent sparks from igniting other materials: Keep the welding area clear and use fire extinguishers nearby in case of emergencies.
Step 3
4.3 Name THREE different types of welding movements that can be considered when making an arc-welding run AND make a neat drawing of EACH welding figure.
Answer
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Figure 8 - A continuous movement resembling the number '8', which helps in achieving a good weld appearance.
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U-shape - A curved motion that resembles a 'U' which is effective for creating strong welds in joints.
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Zigzag - A back-and-forth movement that creates a pattern similar to the letter 'Z', useful for filling gaps and ensuring penetration.
Step 4
4.4 Describe the cutting procedure that must be followed to ensure a safe and clean cut when cutting a 10 mm steel plate with an oxyacetylene set.
Answer
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Set the required gas flow on the oxyacetylene cylinders: Adjust the pressure for both oxygen and acetylene according to the specifications needed for cutting.
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Position the torch according to the cutting needs: Hold the torch at an angle that allows for clean cutting, typically around 45 degrees.
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Heat the material to red hot: Ignite the torch and aim the flame at the steel plate to heat it until it reaches a red-hot state, at which point the cutting can begin.
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Press the oxygen lever to blow away the melted metal: Once heated, increase the oxygen flow to cut through the metal, ensuring that the slag is blown away for a clean cut.
Step 5
4.5 Explain the influence that water or moisture has on the plasma-cutting apparatus below.
Answer
Water or moisture can cause significant issues with the plasma-cutting apparatus. It may lead to short circuits causing damage to the nozzle and electrical systems due to the internal arcing that occurs. Additionally, moisture can create an uneven flame, affecting the quality of the cut and potentially leading to safety hazards during the cutting process.
Step 6
4.6 Design a cattle-handling facility consisting of ONE big holding kraal, THREE smaller kraals, ONE crush pen and functional gates.
Answer
The cattle handling facility should be designed with efficiency and functionality in mind. The big holding kraal should have ample space for the cattle, while the three smaller kraals can be positioned adjacent to it for sorting. The crush pen should be easily accessible from the holding kraal, facilitating stress-free handling of cattle. Gates must be designed for easy operation and should prevent cattle from escaping. Overall, the layout should promote smooth movement through the facility while ensuring that at least 50 cattle can be effectively managed.