4.1.1 Identify A and B - NSC Agricultural Technology - Question 4 - 2020 - Paper 1
Question 4
4.1.1 Identify A and B.
4.1.2 Explain the function of A in the picture above.
4.1.3 Name the material used to manufacture B.
4.1.4 Explain the causes of the small... show full transcript
Worked Solution & Example Answer:4.1.1 Identify A and B - NSC Agricultural Technology - Question 4 - 2020 - Paper 1
Step 1
Identify A and B.
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Answer
A is the gas shroud/cup/cover, which protects the contact tip and directs the flow of gas out of the tip of the torch.
B is the welding electrode/wire used in the MIG welding process.
Step 2
Explain the function of A in the picture above.
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Answer
The gas shroud serves two main functions:
It protects the contact tip from contaminants and spatter.
It directs the shielding gas around the weld area to prevent oxidation and ensure a clean weld.
Step 3
Name the material used to manufacture B.
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Answer
B is typically made from steel or ferrous metals, as these materials provide good conductivity and strength for welding.
Step 4
Explain the causes of the small metal balls that form when welding with a MIG welder.
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Answer
Small metal balls, or spatter, can occur due to several factors:
If the gas is closed or improperly set, it can lead to insufficient shielding.
Dirty surfaces, such as those with paint or grease, can interfere with the weld.
A rusted plate may also cause poor arc stability.
Too low an amperage or improper welding speed can lead to inadequate heat, resulting in spatter.
Incorrect gas flow rates can contaminate the welding bead.
