(a)
(i) Describe the basic differences between manual metal arc welding and adhesive bonding - Leaving Cert Engineering - Question 4 - 2010
Question 4
(a)
(i) Describe the basic differences between manual metal arc welding and adhesive bonding.
(ii) Suggest a suitable application for each of the joining processes ... show full transcript
Worked Solution & Example Answer:(a)
(i) Describe the basic differences between manual metal arc welding and adhesive bonding - Leaving Cert Engineering - Question 4 - 2010
Step 1
Describe the basic differences between manual metal arc welding and adhesive bonding.
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Answer
Manual metal arc welding involves melting and fusing metals at high temperatures, resulting in a very strong joint. This process requires special equipment and a high skill level.
In contrast, adhesive bonding can be performed at lower temperatures and does not require special equipment or skill. It allows for the joining of different materials, although the joints are generally not as strong as those produced by welding.
Step 2
Suggest a suitable application for each of the joining processes in 4(a)(i) above.
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Answer
Manual metal arc welding is commonly used in the fabrication of gates, steel tables, and chair frames due to its strength and durability.
Adhesive bonding is suitable for applications such as footwear manufacturing or attaching outlet covers to walls, where a strong mechanical bond is not critical.
Step 3
Name any one of the two gases most commonly used when gas welding.
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Answer
One of the gases most commonly used in gas welding is Oxygen, often combined with Acetylene.
Step 4
What is the function of the flashback arrestor?
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The flashback arrestor is positioned on both gas supply lines between the hose and regulator to prevent the return of flame through the hose into the regulator and gas cylinders, protecting equipment and users.
Step 5
Name the flame produced when equal amounts of each gas is used.
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The flame produced when equal amounts of oxygen and acetylene are used is known as the Neutral flame.
Step 6
State one safety precaution to be observed.
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Answer
One important safety precaution is to ensure that special goggles must be worn to protect the user from hot metal particles and harmful light rays.
Step 7
List three steps to be observed to ensure a successful soft soldered joint.
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Answer
The surfaces to be joined must be perfectly clean and activated with flux.
The joint should fit tightly together, allowing the solder to flow and create a strong connection.
The item being soldered should be brought to the appropriate temperature before applying the solder.
Step 8
Explain why it is important to work in a well-ventilated area when using adhesives.
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Answer
Working in a well-ventilated area is crucial because adhesives can emit vapours that may be harmful to breathe. Adequate airflow helps to dilute any toxic vapours and reduce the risk of inhalation.
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