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An Experimental Rig For Verification of The Mechanical Properties of Welds Produced at In-Service Welding
Chalmers University of Technology. (Sjöfartsvetenskap)ORCID iD: 0000-0002-4871-4470 
Chalmers University of Technology.
2003 (English)In: Proceedings of OMAE’03 22nd International Conference on Offshore Mechanics and Arctic Engineering, June 8 – 13, 2003, Cancun, Mexico, ASME Press, 2003, Vol. 3, 57-65 p., 37105Conference paper (Refereed)
Abstract [en]

The strength of a weld joint is determined by its geometry and its metallurgic structure, which is dependent on the cooling rate, its chemical composition and the original grain size of the base material. During in-service welding of structures affected by a forced flow of fluid on its reversed side the cooling rate depends on the fluid’s boundary layer, the material’s thickness and the heat input of the welding process. Currently, the calculation of the cooling rate during in-service welding is made by means of numerical methods such as the Finite Element Method, FEM. Through the introduction of an apparent thermal conductivity, kPL, it possible to determine the cooling rate for specific welding parameters by means of Rosenthal’s equation. This can be done with a standard pocket calculator.An experimental rig for measurement of the heat transfer during the in-service welding of structures affected by a forced flow of fluid on its reversed side has been designed and built. The physical principles of welding on plates affected by a forced flow of fluid on their reverse side are the same as for welding on the circumference of a pipe containing a forced flow of fluid. In the rig, the required boundary layer is built up in a pipe system by means of a pump. As the flow and the temperature of the fluid can be controlled to simulate the specific heat transfer, it is now possible to verify the values of the apparent thermal conductivity, kPL, that were calculated

values of the apparent thermal conductivity, kPL, for various configurations.For the purpose of evaluation and qualification of in-service Welding Procedures Specifications, WPS, the sponsors of the research project use the experimental rig.

Place, publisher, year, edition, pages
ASME Press, 2003. Vol. 3, 57-65 p., 37105
Keyword [en]
welding, in-service, hot-tapping, heat transfer, experimental, forced flow of fluid, boundary layer, WPS, WPQR, WPAR
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:lnu:diva-61993DOI: 10.1115/OMAE2003-37105ISBN: 0-7918-3683-5 (print)ISBN: 0-7918-3672-X (electronic)OAI: oai:DiVA.org:lnu-61993DiVA: diva2:1085942
Conference
ASME 22nd International Conference on Offshore Mechanics and Arctic Engineering, June 8 – 13, 2003, Cancun, Mexico
Available from: 2017-03-30 Created: 2017-03-30 Last updated: 2017-04-11Bibliographically approved
In thesis
1. Heat Transfer Prediction of In Service Welding in a Forced Flow of Fluid
Open this publication in new window or tab >>Heat Transfer Prediction of In Service Welding in a Forced Flow of Fluid
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

An algorithm for heat transfer prediction of in-service welding operations in a forcedflow of fluid is presented. The algorithm presented is derived from Rosenthal’s 3D heatflow equation and boundary layer approximations. This was possible by the introductionof an apparent thermal conductivity kPL, which is a function of the boundary layer’s heattransfer coefficient f and the base material’s thickness . This implies that a weldcooling time ΔtT1 /T2 in a forced flow of fluid can now be calculated by an ordinaryengineering calculator and thus enabling suitable welding parameters to be determined.The magnitude of kPLf , was established by regression analysis of results from aparametric finite element analysis series of a total number of 112 numerical simulations.Furthermore, the result of the regression analysis was validated and verified by a weldingexperiment series accomplished on an in-house designed and constructed in-servicewelding rig. The principle design of the welding rig as well as its instrumentation, a PCbased Data Acquisition system, is described. In addition, a method to measure the weldmetals cooling time ΔtT1 /T2 by means of thermocouple elements is described. Finally,the algorithm presented in this study proved feasible for industrial in-service weldingoperations of fine-grained Carbon and Carbon–Manganese steels with a maximum Carbon Equivalent (IIW) (CE) of 0.32.

Place, publisher, year, edition, pages
Gothenburg: Chalmers Univeristy of Technology, Department of Shipping and Marine Technology, 2005. 27 p.
Series
Chalmers Univeristy of Technology, Department of Shipping and Marine Technology, ISSN 1101-0614 ; R-05:91
National Category
Vehicle Engineering
Research subject
Shipping, Maritime Science
Identifiers
urn:nbn:se:lnu:diva-62012 (URN)
Opponent
Projects
Funktionsstabilitet
Available from: 2017-04-10 Created: 2017-03-31 Last updated: 2017-04-10Bibliographically approved

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Citation style
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Output format
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