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Ragnhild Aune

Research Scientist

Ragnhild Aune

Research Scientist

Ragnhild Aune
Phone: 982 83 984
Mobile: 982 83 984
Department: Materials and Nanotechnology
Office: Trondheim

publications and responsibilities

Publications

Publication

Effects of Phase Transformation on Residual Stresses in Welding of Stainless Steels

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S2066

In this investigation, we study the effects of solid state transformation on residual stresses in welding supermartensitic stainless steels, using the Satoh experimental test approach. The results obtained clearly demonstrate that the austenite-to-martensite phase transformation has remarable effect...

Year 2007
Type Journal article
Publication

Root bead profiles in hyperbaric GTAW ofX70 pipeline

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S3383

This investigation began with the goal of studying the root bead penetration profiles in hyperbaric GTAW welding ofX70 pipelines. Such profiles may vary substantially depending on the wire and base melal chemical composition. Root beads were deposited with a pressure corresponding to 75-m seawater d...

Year 2006
Type Journal article
Publication

Weld Metal Mechanical Properties in Hyperbaric GTAW of X70 Pipeline

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S2067

In the present investigation, 2 different wires for hyperbaric (underwater) GTA (gas tungsten arc) welding of X70 pipeline have been tested with respect to their weld metal mechanical properties. Welding of full coupons at different pressures (seawater depths of 16, 75 and 200 msw) was done with sub...

Publication

Mechanical Properties in Hyperbaric GTA Welding of X70 Pipeline

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S2082

In the present investigation two different wires for hyperbaric (underwater) GTA (gas tungsten arc) welding of X70 pipelines have been tested with respect to their weld metal mechanical properties. Welding of full coupons at different pressures (sea water depths of 16, 75 and 200 msw) was done with ...

Year 2006
Type Conference paper/Book chapter
Publication

Root bead penetration profiles in hyperbaric GTA welding ofX70 pipeline

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S3758

The present investigation was initiated with the objective to study the root bead penetration profiles in hyperbaric GTAW welding ofX70 pipelines. Such profiles may vary substantially depending on the wire and base metal chemical composition. Root beads were deposited with a pressure corresponding t...

Year 2006
Type Conference paper/Book chapter
Publication

Mechanical properties in hyperbaric GTA welding of X70 pipeline

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S3293

In the present investigation, 2 different wires for hyperbaric (underwater) GTA (gas tungsten arc) welding of X70 pipelines have been tested with respect to their weld metal mechanical properties. Welding of full coupons at different pressures (seawater depths of 16, 75 and 200 msw) was done with su...

Year 2006
Type Journal article
Publication

Dry Hyperbaric Welding of Subsea Pipelines in the North Sea

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S3149

The expansion of the oil fields in the North Sea has been a driving force for technology development of remotely controlled hyperbaric welding of subsea pipelines, which has been used for tie-ins and repair of pipelines since the mid-1980s. SINTEF (research institute in Norway) has been involved in ...

Publication

HYDROGEN PICK UP AND DIFFUSION IN TIG WELDING OF SUPERMARTENSITIC 13% CR STAINLESS STEEL WITH SUPERDUPLEX WIRE

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S7013

Supermartensitic 13% Cr stainless steels have been in use in offshore satellite flowlines for several years. Since they contain microstructure that is susceptible to hydrogen cracking, the pick up of hydrogen in welding with subsequent transport to critical areas may be very important, also with res...

Year 2005
Type Conference paper/Book chapter
Publication

Evolution of residual stresses in welding ofsupermartensitic 13% Cr stainless steels

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S3703

Supermartensitic stainless steels are now in use in offshore satellite flowlines. Due to their martensitic microstrucrure, these steels may be prone to cold cracking, depending on the hydrogen supply and residual stress development. The latter subject is addressed in the present investigation, where...

Year 2005
Type Conference paper/Book chapter
Publication

Hydrogen and oxygen pick-up in hyperbaric TIG welding of supermartensitic 13% Cr stainless steel with matching filler wire

http://www.sintef.no/en/publications/publication/?pubid=SINTEF+S3707

The possible sources causing weld metal hydrogen and oxygen pick-up during offshore hyperbaric tie-in TIG welding have been identified and simulated at a hyperbaric chamber pressure of 12 bar, i.e. 110 meter sea depth. The base material was supermartensific 13 % Cr stainless steel. Matching filler w...

Authors Aune Ragnhild Knagenhjelm HO Hårsvær Ansgar Sigmund
Year 2005
Type Conference paper/Book chapter
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