1.1 The picture below shows a typical MIG welding machine - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Question 4
1.1 The picture below shows a typical MIG welding machine.
1.1.1 Identify A and B.
1.1.2 Name the TWO gases that are provided as a mixture in the cylinder at... show full transcript
Worked Solution & Example Answer:1.1 The picture below shows a typical MIG welding machine - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Step 1
Identify A and B.
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Answer
A is the welding gun, and B is the crocodile clamp or earth clamp/earth connection.
Step 2
Name the TWO gases that are provided as a mixture in the cylinder at C.
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Answer
The two gases are Argon and Carbon Dioxide (CO₂) or Helium.
Step 3
What is the function of the heat that is produced by the electric arc?
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Answer
The heat produced by the electric arc serves to melt the metal to create a strong joint in the welding process.
Step 4
What is the purpose of the gas shielding the weld bead?
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The gas shielding protects the weld area from contamination by surrounding air and oxygen, ensuring a clean and strong weld.
Step 5
Name TWO non-ferrous metals that can be successfully welded with this machine.
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The non-ferrous metals include Copper and Aluminium, or Titanium.
Step 6
Describe the function of a push-pull torch as found on an MIG welding machine.
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A push-pull torch is used to feed the welding wire consistently through a series of rollers, keeping the wire aligned and preventing it from bending or kinking, which is crucial for creating quality welds.
Step 7
What precautionary measures could be taken to overcome the problem of dripping metal when welding in the vertical up welding position?
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Use a special electrode designed for vertical welding.
Adjust the angle of the torch to an upward position (approximately 30 degrees).
Maintain a steady hand and control the speed to prevent overheating.
Ensure minimal movement of the electrode to limit dripping.
Utilize a lower heat setting if possible, to reduce the amount of molten material being produced.
