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Keywords: welding
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Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-589
... stress was obtained. δ-ferrite was observed with increasing Cr eq /Ni eq ratio. The Experimental results show that volume expansion and toughness were reduced by residue of δ-ferrite. INTRODUCTION Due to the rapid thermal cycles and restriction of surrounding base metal during welding in...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-120
... ABSTRACT Cylindrical leg is an essential structure of jack-up rig, and its fabrication accuracy will influence the operation cost and service lift of offshore structure. Concentrating on the dimensional deformation caused by rack and cylinder welding, the experiment to fabricate the leg...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-363
... ABSTRACT A number of versions of the MIG/MAG process has appeared in the market to cope with the welding of joints formed by high thickness sheets without the need for beveling. This originated in the 1980s under the designation of Transferred Ionized Molten Energy (TIME), whereas the 1990s...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-462
... A Study on Welding Distortion Mitigation by Gas Heating Using a Linearized Inherent Strain Method Hector Ruiz 1, Naoki Osawa 1, Sherif Rashed 2 1 Department of Naval Architecture & Ocean Engineering, Osaka University 2 Joining and Welding Research Institute, Osaka University Suita, Osaka, Japan...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-094
... exposure in the production process of the clad pipes and in an eventual repair welding. In the welding simulation the local temperatures are logged and the resulting file is modified afterwards to include data, if available, from the diffusion bonding process. In the diffusion calculation temperatures are...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-698
... standards should be taken into account. INTRODUCTION High strength steels with yield strengths up to 700 MPa are widely used in Jack-up rigs since many years, whereby the main applications are legs, spud cans, racks and pinions where the advantages of thinner sections, like less weight, less welding...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-705
... controlled to be a mixed microstructure of low carbon bainite and ferrite. The toughness of WM and HAZ are excellent after welded with a large heat input of 300 kJ/cm. The developed steel plate could meet the requirements of large heat input welding during the building process. INTRODUCTION The Yamal...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-248
... ABSTRACT Residual stresses and deformations that generated by pipe forming and pipe welding act as harmful factors causing deformation, buckling, and fatigue behavior of a pipe. In this paper, the effect of residual stresses and deformations due to three roll bending and butt-welding on the...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-448
... of 0.27 wt.-%). Both values are by far below offshore requirements and are highly beneficial for excellent weldability of this steel class. with increasing strength levels and wall thicknesses, not only the base material has to be excellent in its behavior, but also the weld seam and all its critical...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-392
... ABSTRACT Dramatic change of properties happens due to diffusion processes in metal during friction stir welding. The information on influence of friction stir welding thermo mechanical cycle on local mechanical properties of thermo hardenable Al-Mg-Si alloy joints is limited. Purpose of this...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-608
... brittle crack from the electron beam welding (EBW) part. However, the LTG method doesn't need additional EBW to make a brittle. Recently brittle crack arrest (BCA) steels are used in upper deck or hatch side coaming of large container ships to prevent fatal brittle fracture accident. International...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-661
... ABSTRACT The 2 mm thickness sheets of Al-5Mg and technical purity Cu (Cu-ETP) were FSWed to receive butt joints. The geometry of the tool and FSW parameters were determined in order to get sound welds with high level of mechanical properties. Hardness measurements and tensile tests of the...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-571
... ABSTRACT Wet underwater welding is widely used for installation and repair of various offshore structures and vessels, including pipelines, oil and gas offshore platforms, submarines vessels, docks and other offshore constructions. To maintain structural integrity and the required duration of...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-404
... ABSTRACT In multiple-electrode submerged arc welding (SAW) can be achieved with high welding speed and high deposition rate, the deflection of the arc due to the electromagnetic force generated between the electrodes affects the welding quality. However, the arc behavior in high welding...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-513
... ABSTRACT Fusion welding generally requires the use of electrodes. It is, therefore, important to select or design welding electrodes that promote low crack sensitivity and few brittle components. The objective of this study is to analyze the influence of different alloyed elements on...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-523
... ABSTRACT This paper describes the possibilities of using submerged arc welding (SAW) for joining thick high strength steel (HSS) plates, in addition the paper examines usability and define the boundaries of SAW used in Arctic applications. Finally, this paper presents standards requirements...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-568
... welding process parameter welding process application arc welding wet welding underwater welding underwater wet welding metal arc welding neuron artificial intelligence artificial neural network machine learning neural network bead geometry upstream oil & gas requirement...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-519
... ABSTRACT Ultra-high-strength steels (UHSS) and robotized arc MAG welding are nowadays being widely used in the arctic offshore construction industry. Welding in the arctic environment requires that the welding torch and welding arc keep a certain heat density input into the welding pool...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-504
... ABSTRACT High Frequency-Electric Resistance Welded (HF-ERW) steel pipes are suitable for products with thin wall thickness and high accuracy. However manufacturing high chromium steel is difficult by deterioration of corrosion resistance on weld defects. And so by applying quasi-laminar plasma...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-695
... ABSTRACT Welding of two dissimilar materials was carried out in-house with the aid of a Tungsten Arc weld with dynamic measurement of temperature profiles in the vicinity areas of the welding track using high temperature thermocouples. A comparison is shown of the measured transient...

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