Understanding the Interactions of Titanium and Oxygen

摘要

Understanding the interactions of oxygen and titanium is a necessary first step in understanding titanium welding. Titanium's surface oxide is responsible for its remarkable corrosion resistance. A thickening of the transparent oxide is responsible for a repeating rainbow of brilliant surface colours. An oxygen-rich surface layer on the metal leads to low surface ductility and is a primary cause of cracking in forming and drawing. Oxygen present in all grades of titanium metal itself is a strengthening element. However, excess oxygen in welds that have been improperly shielded is a primary cause of embrittlement. Finally, a titanium surface exposed to oxygen reacts exothermically and can lead to burning of bulk material, but also allows titanium to be torch cut like steel.