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Describe any three of the following soft soldering terms: (i) Flux, (ii) Sweating, (iii) Cored solder, (iv) Tinning - Leaving Cert Engineering - Question 4 - 2015
Question 4
Describe any three of the following soft soldering terms: (i) Flux, (ii) Sweating, (iii) Cored solder, (iv) Tinning. Name three types of flame which can be produ... show full transcript
Worked Solution & Example Answer:Describe any three of the following soft soldering terms: (i) Flux, (ii) Sweating, (iii) Cored solder, (iv) Tinning - Leaving Cert Engineering - Question 4 - 2015
Step 1
Describe any three of the following soft soldering terms: (i) Flux
Answer
Flux is a chemical cleaning agent used in soldering to remove oxides from the surface of the metal being soldered. It helps prevent oxidation during the heating process, ensuring a stronger bond. Flux can be active or passive, where active fluxes chemically react with the metal to enhance the soldering process.
Step 2
Describe any three of the following soft soldering terms: (ii) Sweating
Answer
Sweating is a technique used to join two pieces by heating the components and applying solder to create a bond. In this process, both surfaces are coated with solder, which melts and fuses the parts together when the heat is applied. As the solder cools, it solidifies, firmly connecting the two pieces.
Step 3
Describe any three of the following soft soldering terms: (iii) Cored solder
Answer
Cored solder consists of wire with a core filled with flux. This design allows the flux to be released as the solder melts, aiding in the cleaning process during soldering. The inside core helps in better heat transfer and effective joining of electrical components, making it ideal for circuit board soldering.
Step 4
Name three types of flame which can be produced when using the oxy-acetylene torch.
Answer
The three types of flames produced by an oxy-acetylene torch are:
- Neutral flame: An equal ratio of oxygen and acetylene.
- Oxidising flame: Contains more oxygen than acetylene.
- Carburising flame: Has a greater ratio of acetylene than oxygen.
Step 5
State the proportions of oxygen and acetylene required for each of the three flames at 4(b)(i).
Answer
- Neutral flame: 1:1 ratio of oxygen to acetylene.
- Oxidising flame: Greater amount of oxygen compared to acetylene; typically around 1.5:1.
- Carburising flame: Greater amount of acetylene compared to oxygen; usually around 1.5:1.
Step 6
Answer any three of the following: (i) Describe how heat is produced during manual metal arc welding.
Answer
Heat in manual metal arc welding is produced by an electric current passing through the electrode to the workpiece. The electrode melts as it touches the workpiece, allowing the connection to maintain an arc. Once the arc is established, it provides sufficient heat to melt the base metals.
Step 7
Answer any three of the following: (ii) Name a suitable method used to join light gauge aluminium.
Answer
A suitable method for joining light gauge aluminium is using rivets or self-tapping screws. These methods are effective due to the lightweight properties and the ability to create strong mechanical bonds without requiring high heat.
Step 8
Answer any three of the following: (iii) List two safety precautions to be observed when soldering electrical circuits.
Answer
- Always return the soldering iron to its stand when not in use to prevent accidental burns.
- Ensure the workspace is clear of any flammable materials to reduce the risk of fire.
Step 9
Answer any three of the following: (iv) Name the type of machine screw shown and suggest a suitable application.
Answer
The type of machine screw shown is a countersunk screw. A suitable application for this screw is in woodworking projects where a flush finish is required, allowing the screw head to be recessed into the material.
Step 10
Explain two reasons why the face must be protected during manual metal arc welding.
Answer
- To protect the face and eyes from the intense heat produced by the welding arc, which can cause serious burns and injuries.
- To protect against UV light which can cause damage to the skin and eyes, leading to long-term health issues and vision problems.