Blue Demon ERTI-2 x 1/16" x 36" x 1LB Tube Titanium Welding Rod There are four grades of commercial pure titanium but ERTi-2 is the most popular because of its good balance of strength, formability and weldability The most common applications are aircraft industry where tensile strength and weight ratios are very critical Other uses would include cryogenic and petrochemical applications such as chemical process heat exchangers