FATIGUE STRENGTH OF TITANIUM RISER WELDS - EFFECTS OF MATERIAL GRADE AND WELD METHOD

摘要

MARINTEK in co-operation with Institute of Energy Technology (IFE) has carried out a Joint Industry research programme Titanium Risers and Flowlines. The programme consisted of five sub-projects: Design, corrosion, welding, mechanical characterisation and fatigue. The primary results from the programme has been published in a Handbook (1999). The objective of this paper is to report on some of the results from the fatigue sub-project. Girth welded joints from a supplier of titanium pipe were fatigue tested in air. Pipe was welded by the TIG process, in 1G and 5G positions, with ASTM Grade 28 and 29 pipe material. Constant amplitude SN data were obtained. The resilts were compared with current proposals for fatigue design curves for titanium riser welds.