EXST 2201 Chapter : Welding HW 3 Q 3 4 5
Document Summary
The flame used in fusion welding can be carburizing, neutral or oxidizing. The neutral flame is when the oxygen is adjusted so as to completely burn off all the acetylene in the welding flame and surrounding atmosphere. By this the flame is chemically neutral and this is usually the starting point for all other flame adjustments. By reducing the oxygen or increasing the acetylene from a neutral flame creates a carburizing flame. The unburned carbon from excess acetylene insulates the flame dropping the flame temperature approximately 2800 c. The excess carbon is also absorbed by the molten metal which hints the name. Opposite to the carburizing flame, the oxidizing flame is obtained by reducing acetylene and increasing oxygen from a neutral flame. Due to the excess of oxygen, this type of flame burns at higher temperatures than any other flame type.
