What is the most commonly used gas in welding?

Acetylene is the most commonly used gas in welding due to its high flame temperature and ability to produce a very intense, focused flame when combined with oxygen. This property allows for efficient melting and joining of metals, making it ideal for various welding applications, including oxy-acetylene welding, which is particularly favored for welding thicker materials. The combination of acetylene with oxygen creates a flame that can reach temperatures exceeding 3,500 degrees Celsius, providing the necessary heat for effective welding.

In welding practices, acetylene is often utilized for its versatility, as it can be used for cutting as well as welding and brazing. Its efficiency in producing hot, concentrated flames contributes significantly to its popularity in the welding industry. The other gases listed, while they may have applications in specific contexts, do not match the overall performance and suitability of acetylene for general welding tasks. This makes acetylene the preferred choice among welders for many projects, particularly those requiring the capabilities of gas welding.