Inconel 625 Performance as Hyperbaric GMA Welding Consumable for Diverless Retrofit Tee Hot Tap Applications
The use of fully remotely installed retrofit tees for hot tapping applications is an extremely attractive economic option for maximising the potential of oil-fields. A diverless hot tap tee system is in the process of being built and commissioned, with hyperbaric GMA welding selected as the internal saddle seal welding method. Process capability has previously been demonstrated in the 145 to 1,000m range using a specially-developed 1.0mm metal-cored wire. This paper considers the performance and application of a 0.9mm Inconel 625 wire for hot tap welding. A direct comparison of the performance of the two wires is made: process and electrical stability; metallurgical analysis; and, macro quality and mechanical properties.
Academic chapter/article/Conference paper
- Hans Fostervoll
- Odd Magne Akselsen
- SINTEF Industry / Materials and Nanotechnology
International Society of Offshore & Polar Engineers
Proc. of the 17th Int. Conf. on Offshore and Polar Eng., ISOPE 2007