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Incubator LLC | Date: 2016-06-09

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Moe P.T.,Norwegian University of Science and Technology | Moe P.T.,AMR Engineering AS | Salberg B.,AMR Engineering AS | Rabben K.,AMR Engineering AS | And 4 more authors.
International Journal of Material Forming | Year: 2010

Shielded Active Gas Forge Welding is a fully automatic high speed welding process for metals. It was invented in the early 1980s, but has since then been significantly improved and commercialized for mainly casing and pipeline applications for the oil and gas industry. The method consists of three main steps: (1) localised heating of the mating surfaces, (2) forging and joining of the mating surfaces and (3) heat treatment of the weld. An entire welding cycle can be completed in two minutes, independent of dimension. The method has been used for welding a great range of alloys, and it produces a weld with properties similar to those of the base material. © 2010 Springer-Verlag France. Source

Liu J.Y.,AMR Engineering AS | Moe P.T.,AMR Engineering AS | Moe P.T.,Norwegian University of Science and Technology | Ganesan S.M.,Norwegian University of Science and Technology | And 4 more authors.
International Journal of Material Forming | Year: 2010

Shielded Active Gas Forge Welding is a robust and efficient solid state welding method applicable to offshore and oilfield applications. The mechanical or fracture performance of the welded connection may be influenced by the forge weld shape. In this paper the main focus is on the geometry effect of weld shape and defects on forge weld mechanical performance and fracture behavior. The potential impact of variables on the undercut description is parametrically analyzed by finite element calculation. As for the undercut located in the transition region between weld and base material, our studies show that the outer undercut of more than 0.3 mm has a significant impact on mechanical behaviour of welded pipe. When the undercut is located in the fusion plane, its impact on mechanical performance of welded pipe is negligible. Weld caps are beneficial since they contribute to weakening the driving forces for crack propagation. Even if the effect of undercut is considered, the beneficial contribution of weld cap still exists. © 2010 Springer-Verlag France. Source

Ganesan S.M.,Norwegian University of Science and Technology | Moe P.T.,Norwegian University of Science and Technology | Moe P.T.,AMR Engineering AS | Vinothkumar P.,Norwegian University of Science and Technology | And 6 more authors.
International Journal of Material Forming | Year: 2010

Microstructure design and heat treatment cycle optimization are two vital activities in any metal forming process which involves high working temperature. Much emphasis is given within these activities to achieve desired structural and mechanical properties of the end products. In this paper an attempt has been made to establish innovative and efficient heat treatment cycles for forge welded API L80 tubular joints. A requirement is that the heat treatment is completed within 5 to 6 minutes after welding. The L80 alloy studied here is a medium carbon steel that has abundant oilfield applications. In order to assess optimal heat treatment for the weld zone, displaying a highly transient and nonuniform temperature distribution, continuum modelling of the process has been performed. Forge welding is a process in which two mating surfaces of pipes are heated (within a small confined depth from the contacting surfaces) to a certain temperature and joined by applying a pressure. The whole process is carried out in the solid state producing a weld without weld metal and with narrow heat affected zone (HAZ), which distinguish it from some of the more conventional welding processes available to produce tubular joints. Specific mechanical properties of forge welded L80 tubular joints were obtained by a unique approach to heat treatment and microstructural design at joints as well as HAZ. Heat treatment cycles were estimated in SINTEF's Smitweld Thermal Cycle Simulator ® to compare with the actual forge welding process. A detailed analysis of specimens subjected to Smitweld simulation and forge welding was carried out to study compatibility and to establish optimum heat treatment conditions for forge welding of L80 tubular joints. © 2010 Springer-Verlag France. Source

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