Final answer:
When braze welding, an oxidizing flame should be used to tin the weld area.
Step-by-step explanation:
When braze welding, you should use an oxidizing flame to tin the weld area.
Tinning is the process of applying a thin coat of solder to the surfaces to be joined. It helps improve adhesion and ensures a strong bond.
An oxidizing flame has an excess of oxygen, which promotes the formation of oxides on the surface of the metal. This helps remove impurities and prepares the surface for soldering.