Final answer:
Common oxyfuel gases used for welding include Acetylene and Propane. Acetylene is used for its very hot flame in oxyacetylene welding, while propane is also used for welding and heating applications.
Step-by-step explanation:
The common types of oxyfuel gases used for welding are Acetylene and Propane. Specifically, acetylene is utilized in oxyacetylene torches for cutting and welding metals due to its capability to produce a very hot flame. Propane is another oxyfuel gas that is often used in welding and cutting applications. It is also used for heating in engines and homes. The high heat of combustion for acetylene is particularly advantageous for welding torches as it can easily melt most metals.
During the oxyfuel welding process, acetylene (C2H2) is commonly mixed with oxygen to produce a flame of sufficient temperature to melt the workpiece. In oxyacetylene welding, a mixture of acetylene and oxygen is burned to create a welding flame that can reach temperatures above 3,500 degrees Celsius, enabling it to join metals such as steel and iron effectively.