Gas Welding Short Questions! Trivia Quiz

Explanation
The three main flame types are carburising, neutral, and oxidising. Carburising flame is used to introduce carbon into the surface of a metal, neutral flame does not introduce any elements into the metal, and oxidising flame introduces oxygen into the metal to promote oxidation.

Explanation
It is not safe to use matches when lighting a welding torch. Welding torches require a high-intensity flame, which matches cannot provide. Instead, a welding torch should be ignited using a flint lighter or a spark lighter specifically designed for welding purposes. Using matches can lead to accidents or injuries due to the insufficient flame produced.

Explanation
Highly flammable materials should be cleared from the work area for a radius of two metres when welding with oxy-acetylene equipment. This statement is false. When welding with oxy-acetylene equipment, highly flammable materials should be cleared from the work area for a radius of at least 10 meters. This is because the welding process produces sparks, heat, and flames that can easily ignite flammable materials and cause a fire hazard. Therefore, it is important to maintain a safe distance to prevent accidents and ensure the safety of the work environment.

Explanation
In the process of carburization, excess acetylene is used to introduce carbon into the surface of a material, typically steel, to increase its hardness. This is done by heating the material in a fuel-rich environment, where the excess acetylene reacts with the heated metal to form carbon compounds. This creates a carburizing flame, which is characterized by an excess of fuel (acetylene) and a reducing atmosphere. The carbon introduced into the material enhances its strength and wear resistance. Therefore, the correct answer is "Carburising flame."