Which gas combination produces one of the hottest flames used in cutting and welding?

The combination of acetylene and oxygen produces one of the hottest flames used in cutting and welding due to the high combustion temperature achieved when these two gases react. Acetylene burns at an approximate temperature of 3,500 degrees Celsius (6,332 degrees Fahrenheit) when mixed with oxygen, making it suitable for processes that require intense heat, such as oxyacetylene cutting and welding.

This extreme heat makes acetylene-oxygen mixtures highly effective for cutting through metals of various thicknesses and for welding applications, where precision and high temperatures are critical for creating strong, reliable joints. In contrast, while other gas combinations like propane and oxygen can produce a flame, they do not reach the same temperatures and thus are not as suitable for tasks that demand the high intensity that acetylene provides.