In which type of oxy-acetylene welding flames are both acetylene and oxygen in equal proportions?

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RRB JE ME 22 Apr 2025 Shift 2 CBT 2 Official Paper

Answer 1

Explanation:

Oxy-Acetylene Welding:

Oxy-acetylene welding, also known as gas welding, is a process that uses the combustion of acetylene (C₂H₂) and oxygen (O₂) to produce a flame capable of melting metals. The flame produced can be adjusted to achieve different characteristics suitable for various welding applications.

Types of Oxy-Acetylene Welding Flames:

Neutral Flame: A neutral flame is achieved when acetylene and oxygen are mixed in equal proportions. This flame has a balanced ratio of fuel and oxidizer, resulting in complete combustion with no excess oxygen or acetylene. It is characterized by a short, well-defined inner cone and a larger outer envelope. The temperature of a neutral flame is around 3,200°C (5,792°F), making it ideal for welding most metals without altering their chemical properties.
Oxidizing Flame: This flame is produced when there is an excess of oxygen in the mixture. It has a shorter inner cone and a sharp, hissing sound. The oxidizing flame is hotter than the neutral flame, reaching temperatures up to 3,500°C (6,332°F). It is used for welding materials like brass and bronze, which require a higher temperature and can tolerate the oxidizing environment without damage.
Reducing Flame (Carburizing Flame): A reducing flame, also known as a carburizing flame, is produced when there is an excess of acetylene in the mixture. It has a longer, feathered inner cone and is cooler than the neutral flame, with temperatures around 2,900°C (5,252°F). This type of flame is used for welding high-carbon steels and for applications requiring a reducing environment to prevent oxidation.