What type of flame is used when welding brass on bronze?

When welding brass on bronze, the appropriate type of flame to use is typically a neutral flame. A neutral flame is characterized by an equal ratio of oxygen and acetylene, producing a clean, steady flame that neither oxidizes nor carburizes the metal being welded. This quality is particularly important when working with metals like brass and bronze, as it helps prevent unwanted chemical reactions that could weaken the joint or negatively affect the color and characteristics of the metals.

The neutral flame provides the right amount of heat needed to melt both brass and bronze without altering their properties, which is crucial for achieving a strong and aesthetically pleasing weld. It's essential in applications where maintaining the integrity of the base metals is necessary for both strength and appearance, which is why it is preferred in this context.

Using an oxidizing or reducing flame could lead to defects such as oxidation or formation of undesirable compounds due to either excess oxygen or carbon. Therefore, the neutral flame is the optimal choice for welding brass onto bronze.