The welding of a titanium tube sheet with titanium tubes. The tube sheet is made of titanium cladding: ASTM A516 Grade 70 plate bonded with the ASTM B265 Gr.1 sheet. The titanium welded tubes (Φ25mm x 0.7mm thk. x 11.2m length) are manufactured to ASTM B338 Grade 1. The tube sheet is designed for a power plant condenser in Australia.