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Underwater wet welding of duplex steel
Welding in the world, 2009Due to increased application of duplex steels in off-shore systems there is number of situations where undetwater wet welding is needed for repair and maintenance purposes. However, there is very few investigations found in the literature about this matter. Fast cooling, high diffusible hydrogen, porosity etc.
Kralj, Slobodan +2 more
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Multiscale 3D characterization of discontinuities in underwater wet welds
Materials Characterization, 2015Abstract Underwater wet welding is performed in direct contact with other, with high cooling rates and gas metal reactions that lead to the formation of pores, cracks and inclusions in the weld metal. These discontinuities appear in a wide range of sizes, shapes and orientations, and require 3D techniques for complete characterization.
L.F. Silva +4 more
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Electrodes for underwater wet welding
2000Basics 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 +2 more
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Effect of Nickel on Toughness of Underwater Wet Welds
Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops, 2003Underwater wet welding has been used as an option for the repair of offshore platforms. Rutile-grade electrodes are typically used to carry out the underwater repairs because of their good arc stability, bead appearance, and bead morphology. However, the main problems to overcome are porosity and reduction of toughness and strength as the water depth ...
Faustino Perez +3 more
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Fracture Toughness of Underwater Wet Welds
1990The 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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A Predictive Electrochemical Model for Weld Metal Hydrogen Pickup in Underwater Wet Welds
Journal of Offshore Mechanics and Arctic Engineering, 1998Weld metal hydrogen pickup in underwater wet welding is severe due to the presence and dissociation of water surrounding the welding arc. This undesirable behavior can be minimized, however, with the use of oxidizing-type electrodes. The purpose of this investigation has been placed on the fundamental understanding of the effect of hydrogen pickup by ...
R. C. de Medeiros, S. Liu
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NUMERICAL ANALYSIS OF THE WELD BEAD PROFILESIN UNDERWATER WET FLUX-CORED ARC WELDING
Acta Metallurgica Sinica, 2013Underwater wet flux-cored arc welding(FCAW) has great potential prospects of wide application in ocean engineering due to its easiness of automation and high weld quality.However,the thermal process of underwater wet welding is more complicated:the arc energy distribution is more concentrated in high-pressure environment of underwater,the convection ...
Bo ZHAO +3 more
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L51823 Underwater Wet Welding of Pipeline Steels
2000Underwater 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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Influence of calcium fluoride on underwater wet welding process stability
Welding in the World, 2018To explore the influence of calcium fluoride on underwater wet welding process stability, the relevance of calcium fluoride in the flux to metal transfer mode and arc stability was discussed in the process of underwater wet welding using a set of wires with various calcium fluoride contents.
Ning Guo +5 more
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Underwater Wet Weld Seam Tracking Based on Passive Visual Sensor
Advanced Materials Research, 2013Weld seam tracking system is urgently needed in weld automation process, but it has not been well studied in underwater weld applications. This paper used visual sensor to automatically monitor the weld seam in underwater wet weld process, and image processing algorithms were developed to remove the influence of water environment on the captured image ...
Bo Chen, Chuan Bao Jia, Ji Cai Feng
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