Red Seal Welding Practice Exam

Never use fittings on an acetylene setup made from what material?

1. Steel

2. Aluminum

3. Red brass and copper

4. Plastic

The correct answer is: Red brass and copper

Fittings should not be used on an acetylene setup made from red brass and copper because these materials are not compatible with acetylene gas and can cause dangerous reactions. While steel is a common material for acetylene setups, it can also react with the gas and cause issues. Aluminum and plastic are also not suitable because they can easily ignite when exposed to acetylene gas. It is important to use materials specifically designed for acetylene gas in order to prevent accidents and ensure safety.