Chemistry 2004 JAMB Past Questions - Question 40: Oxyacetylene flame is used for iron-welding because it

Correct Answer

C

Explanation

The oxyacetylene flame is commonly used in welding, including iron welding, due to several advantageous properties of this type of flame. Oxyacetylene welding involves the combustion of acetylene gas mixed with oxygen to produce a high-temperature flame. Here are some reasons why oxyacetylene flame is suitable for iron welding:

1. **High Temperature:** The oxyacetylene flame can reach temperatures of around 3,500 degrees Celsius (6,332 degrees Fahrenheit). This high temperature is essential for melting and welding iron, which typically requires a significant amount of heat.

2. **Neutral Flame:** The oxyacetylene flame has a neutral or slightly reducing character, meaning it has a balanced ratio of oxygen and acetylene. This is important for welding ferrous metals like iron, as it helps prevent oxidation of the metal during the welding process.

3. **Versatility:** Oxyacetylene welding is versatile and can be used for various thicknesses of metal. The flame can be adjusted to provide the right amount of heat for different welding applications.

4. **Portability:** Oxyacetylene equipment is relatively portable and can be used in various locations, making it suitable for on-site welding.

5. **Controlled Heat:** The flame produced by oxyacetylene welding equipment is highly controllable. Welders can adjust the flame temperature and size according to the specific requirements of the welding job.

While oxyacetylene welding is effective for many applications, other welding processes, such as arc welding or MIG welding, may be preferred for certain situations. Each welding method has its advantages and is chosen based on factors such as the type of material, the thickness of the metal, and the specific requirements of the welding project.