Results 241 to 250 of about 45,254 (277)

Underwater Wet Welding of Higher Strength Offshore Steels

Offshore Technology Conference, 1989
ABSTRACT The problems in underwater wet welding of higher strength steels are identified. Engineering fundamentals are being considered to guide future research to overcome some of the limitations to deep wet underwater welding of higher strength steels.
S. Ibarra, D.L. Olson, C.E. Grubbs
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Electrodes for underwater wet welding

2000
Basics of underwater wet welding are briefly reported, a particular attention being paid to the topic of filler materials for underwater manual arc welding. Research activities in development of filler material for underwater wet manual arc welding has been also reported.
Garašić, Ivica, Kralj, Slobodan, Kožuh, Zoran   +2 more
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Arc Stability Indexes Evaluation on Underwater Wet Welding

29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 6, 2010
Underwater wet welding (UWW) with shielded metal arc welding (SMAW) is employed basically in repairs of offshore structures, including platforms, ships and others. The main problems of this type of welds are related, of course, with water presence in the electric arc that causes higher cooling rates, Oxygen and Hydrogen availability in the arc ...
Ezequiel C. P. Pessoa, Leandro F. Ribeiro, Alexandre Q. Bracarense, Weslley C. Dias, Luciano G. D. Andrade, Stephen Liu, Valter R. Santos, Mauri´cio J. Monteiro   +7 more
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Wet Welding as a “Serious” Repair Procedure?

Journal of Offshore Mechanics and Arctic Engineering, 1998
Due to intensive and concentrated research activities during the last 10 to 15 yr, the quality of wet-welded joints has been improved to an extent that this process is currently regarded as a potential alternative to the more costly dry hyperbaric welding processes in comparable water depths.
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Fracture Toughness of Underwater Wet Welds

1990
The wet and wet-backed shielded metal-arc welding (SMAW) process can produce welds suitable for structural applications provided fracture control is considered in the design. Welding procedure qualification tests and fracture toughness tests [the ASTM Test for JIc, a Measure of Fracture Toughness (E 813-87)] were performed on the heat-affected zone ...
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Efficiency evaluation of underwater wet welding processes

Blanking productions in mechanical engineering (press forging, foundry and other productions)
Productivity and coefficient of surfacing during wet underwater welding with coated electrodes and tamper-proof flux-cored wire in laboratory conditions are determined. In flux-cored wire welding, productivity is much more dependent on current than in manual welding.
G.N. Vostretsov, V.M. Karpov, V.O. Muktepavel   +2 more
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Image processing for wet welding in turbid condition

Proceedings of the 2000 International Symposium on Underwater Technology (Cat. No.00EX418), 2002
Automatic wet welding technique with local dry space by water jet curtain has proved its high quality of mechanical properties in weld metal. The most important point to keep high weld quality is precise nozzle positioning. The light cutting method by slit laser beam is promising for shape recognition in air condition.
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Wet Welding Platform Design based on Ultrasonic Sensor

International Journal of Advancements in Computing Technology, 2013
The research platform for underwater wet welding is designed and high frequency ultrasonic sensor is put into use, The research platform comprises four independently movable shafts which names as X, Y, Z and A axis, The four axes are driven by servo motor and stepping motor, The features of both servo motor and stepping motor are analyzed at first, and
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L51823 Underwater Wet Welding of Pipeline Steels

2000
Underwater wet welding is presently accepted only for structural repairs to offshore facilities. The application of underwater wet welding to sub-sea pipelines and risers has been limited due to its perceived quality deficiencies compared to surface welds.
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3-D Porosity in T-Welded Connections Repaired by Grinding and Wet Welding

2015
This work presents a methodology to create 3-D porosity into finite element models of T-welded connections repaired by rectangular grinding and filled with wet welding. In a wet welding process, the porosity increases with water depth, as a result, the developed wet welding can present low mechanical properties.
G. Terán, S. Capula-Colindres, R. Cuamatzi-Meléndez, D. Angeles-Herrera, A. Albiter   +4 more
openaire   +1 more source