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Describe, with the aid of suitable diagrams, the make-up of the following oxy-acetylene flames: (i) Oxidising flame, (ii) Neutral flame, (iii) Carburising flame - Leaving Cert Engineering - Question Question 1 - 2014
Question Question 1
Describe, with the aid of suitable diagrams, the make-up of the following oxy-acetylene flames: (i) Oxidising flame, (ii) Neutral flame, (iii) Carburising flame. E... show full transcript
Worked Solution & Example Answer:Describe, with the aid of suitable diagrams, the make-up of the following oxy-acetylene flames: (i) Oxidising flame, (ii) Neutral flame, (iii) Carburising flame - Leaving Cert Engineering - Question Question 1 - 2014
Step 1
Describe, with the aid of suitable diagrams, the make-up of the following oxy-acetylene flames: (i) Oxidising flame
Answer
An oxidising flame contains more oxygen than acetylene. It is characterized by a pointed inner blue cone and is not ideal for welding because the excess oxygen can cause rusing of the joint. An oxidising flame is typically used for cutting metals.
Step 2
Describe, with the aid of suitable diagrams, the make-up of the following oxy-acetylene flames: (ii) Neutral flame
Answer
A neutral flame has equal amounts of oxygen and acetylene, which makes it suitable for welding most materials. It can be identified by a more rounded inner cone and does not oxidize or carburize the metal being welded.
Step 3
Describe, with the aid of suitable diagrams, the make-up of the following oxy-acetylene flames: (iii) Carburising flame
Answer
A carburising flame contains a greater ratio of acetylene to oxygen, characterized by an extended inner cone. This type of flame can introduce carbon into the weld joint, improving hardness and is often used for welding certain types of steel.
Step 4
Explain any three of the following in relation to welding: (i) Earth clamp
Answer
An earth clamp is a spring-loaded device that attaches to the material being welded. It connects to the power source and ensures the welder is grounded properly, allowing for a complete electric circuit which is essential for welding.
Step 5
Explain any three of the following in relation to welding: (ii) Welding mask
Answer
A welding mask protects the welder's eyes and face from intense light and heat generated during the welding process. The tinted glass allows for better visibility of the weld while protecting the eyes from damage.
Step 6
Explain any three of the following in relation to welding: (iii) Pressure gauge
Answer
The pressure gauge indicates the gas pressure coming from the welding cylinders. It is an essential tool in oxy-acetylene welding as it helps the welder monitor and adjust the gas supply for optimal welding conditions.
Step 7
Answer any three of the following: (i) State two reasons why flux is required when soldering.
Answer
Flux is crucial in soldering to initially clean surfaces of any oxides that could hinder the quality of the joint. Additionally, it prevents further oxidation during the heating process, ensuring a strong and reliable connection.
Step 8
Answer any three of the following: (ii) Name the special machine screw shown and suggest a suitable application.
Answer
The special machine screw shown is a socket head screw, which is designed to be fitted flush with the surface of the part. A suitable application is in machinery or equipment where a low-profile fastening is required.
Step 9
Answer any three of the following: (iii) List two safety precautions to be observed when spot welding.
Answer
- Always wear protective goggles to shield the eyes from sparks and UV radiation.
- Ensure that the joint is properly assembled to avoid any sparks or hot metal from causing burns or fire hazards.
Step 10
Answer any three of the following: (iv) Name the type of washer shown and suggest a suitable application.
Answer
The type of washer shown is a spring washer, which is used under a nut or bolt to prevent loosening due to vibration. A common application is in automotive components that experience dynamic loads.
Step 11