Name the three types of oxyacetylene flame shown:
(i)
(ii)
(iii)
Answer any three of the following in relation to manual metal arc welding:
(i) How is the heat produced for welding?
(ii) Why is a flux required at the joint?
(iii) What is the function for the earth clamp?
(iv) State one suitable safety precaution to be observed - Leaving Cert Engineering - Question 4 - 2009
Question 4
Name the three types of oxyacetylene flame shown:
(i)
(ii)
(iii)
Answer any three of the following in relation to manual metal arc welding:
(i) How is the... show full transcript
Worked Solution & Example Answer:Name the three types of oxyacetylene flame shown:
(i)
(ii)
(iii)
Answer any three of the following in relation to manual metal arc welding:
(i) How is the heat produced for welding?
(ii) Why is a flux required at the joint?
(iii) What is the function for the earth clamp?
(iv) State one suitable safety precaution to be observed - Leaving Cert Engineering - Question 4 - 2009
Step 1
How is the heat produced for welding?
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Answer
Heat for welding is generated by the electrical arc formed between the welding electrode and the metal being welded. This process produces temperatures sufficient to melt the base metal and the filler material, creating a strong joint.
Step 2
Why is a flux required at the joint?
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Answer
A flux is crucial at the joint because it removes oxides and other impurities, ensuring a clean weld pool. Additionally, it helps to control the cooling rate by producing a slag cover, which protects the molten metal from atmospheric contamination.
Step 3
What is the function for the earth clamp?
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Answer
The earth clamp is used to complete the electrical circuit between the welding machine and the metal being welded. It ensures that the current flows effectively through the metal, allowing the welding process to proceed.
Step 4
Identify the process used for making a permanent joint with Tinplate.
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Answer
The process used for making a permanent joint with tinplate is Soft soldering.
Step 5
Identify the process used for making a permanent joint with Mild steel plate.
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Answer
The process used for making a permanent joint with mild steel plate is Gas welding or Spot welding.
Step 6
Identify the process used for making a permanent joint with Acrylic.
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Answer
The process used for making a permanent joint with acrylic is Adhesives or Plastic welding.
Step 7
Identify the process used for making a permanent joint with Light gauge aluminium.
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Answer
The process used for making a permanent joint with light gauge aluminium is Pop rivets or Adhesives.
Step 8
Give two reasons why goggles must be worn when gas welding.
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Answer
Goggles must be worn when gas welding to:
Protect the user from hot metal particles that may be ejected during the welding process.
Protect the user from the bright light produced by the gas flame, which can cause eye damage.
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