Welded titanium tube The evolution of modern superalloys has coincided with the evolution of the gas turbine engine for the aircraft industry. The rate of development of new alloys has been rapid and, in many respects, surpassed the development in companion joining techniques. Traditionally, emphasis in alloy development has been on high-temperature strength, stress rupture, and oxidation properties. Metal joining has been treated as a separate problem by welding and brazing engineers who were usually required to devise procedures and techniques to join each new alloy after it had been developed. This has resulted in exaggerated fabrication costs for some alloys because of unpredictable and uncontrolled metallurgical variations causing such problems as cracking during welding. Titanium is often preferred for aviation welded tube. The welding of superalloys. Despite many difficulties, welding has been and will continue to be one of the main fabrication techniques for aircraft and ...