Читать книгу Welding Metallurgy - Sindo Kou - Страница 20

When excess acetylene is used, the resulting flame is called a reducing flame. The combustion of acetylene is incomplete. As a result, a greenish acetylene feather between the inert cone and the outer envelope characterizes a reducing flame (Figure 1.9b). This flame is reducing in nature and is good for welding aluminum alloys because aluminum oxidizes easily. It is also good for welding high‐carbon steels (also called carburizing flame in this case) because excess oxygen can oxidize carbon and form CO gas porosity in the weld metal.