The Experts below are selected from a list of 3021 Experts worldwide ranked by ideXlab platform
Jicai Feng - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of underwater wet welded high Carbon Equivalent steel q460 using austenitic consumables
Journal of Materials Processing Technology, 2017Co-Authors: Hongliang Li, Yanyu Song, Jicai FengAbstract:Abstract Underwater wet flux-cored arc welding of Q460 steel using specially developed Ni-based filler and commercially obtained ER308 were investigated. Wet welded joints using Ni-based filler were of high performance with high ultimate tensile strength (518 MPa) and impact toughness of the weld metal (128.9 J/cm 2 ). ER308 failed to acquire sound welded joints due to extensive slag remained in the bottom of groove. The highest microhardness (450 HV) was recorded on the coarse-grained heat-affected zone of the base metal for both joints. TypeⅡboundaries existed in the interfaces between austenitic weld metal and ferritic base metal. Compared to austenitic stainless steel weld metal, nickel-based weld metal possessed the ability to be significantly diluted by Q460 base metal.
C.e. Grubbs - One of the best experts on this subject based on the ideXlab platform.
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UNDERWATER WET-WELDING TECHNIQUES FOR REPAIR OF HIGHER-Carbon-Equivalent STEELS
Offshore Technology Conference, 2013Co-Authors: S. Ibarra, R.l. Reed, J.k. J.k. Smith, P.e. O'connor, C.e. GrubbsAbstract:The paper describes the problems and options for wet welding of offshore structures. It compares the advantages and disadvantages of using ferrite and nickel base wet welding electrodes. Recommendations are made for producing crack free wet welds in higher strength steels including temper bead techniques and the use of electrodes with thermit fluxes.
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The Structural Repair of a North Sea Platform Using Underwater Wet Welding Techniques
Offshore Technology Conference, 2013Co-Authors: S. Ibarra, R.l. Reed, J.k. J.k. Smith, I. Pachniuk, C.e. GrubbsAbstract:Underwater wet welding repair techniques using ferritic electrodes have, until recently, been limited to low strength steel with Carbon Equivalents below 0.4% because the fast quench that occurs after welding produces hard head affected zones susceptible to hydrogen cracking. This paper describes the first documented structural wet weld repair of the North Sea offshore platform constructed with steel that had a Carbon Equivalent greater than 0.40%. It describes the events that lead to the failure and documents the repair using underwater wet welding techniques.
Byung Gyu Park - One of the best experts on this subject based on the ideXlab platform.
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influence of Carbon Equivalent value on the weld bead bending properties of high strength low alloy steel plates
Journal of Materials Science & Technology, 2017Co-Authors: In Jun Moon, Ki Bong Kang, Byung Gyu ParkAbstract:The contribution of chemical compositions in terms of Carbon Equivalent value (CEV) on impending crack propagation during weld bead bend tests (WBBTs) was studied with five different high-strength low-alloy steel plates that underwent different rolling processes. The test showed that cracks developed at the weld joint, easily passed through the coarse-grain heat-affected zone (CGHAZ), and finally were arrested within the heat-affected zone (HAZ). An apparent decrease in the average crack length, which consequently indicated improvement in crack arrestability, was found with decreasing CEV. In addition, the relatively fine microstructure in the HAZ of low-CEV steel plates helped in preventing the crack from further propagation. Special emphasis was placed on the empirical expectation of critical CEV above which WBBT might fail.
Hongliang Li - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of underwater wet welded high Carbon Equivalent steel q460 using austenitic consumables
Journal of Materials Processing Technology, 2017Co-Authors: Hongliang Li, Yanyu Song, Jicai FengAbstract:Abstract Underwater wet flux-cored arc welding of Q460 steel using specially developed Ni-based filler and commercially obtained ER308 were investigated. Wet welded joints using Ni-based filler were of high performance with high ultimate tensile strength (518 MPa) and impact toughness of the weld metal (128.9 J/cm 2 ). ER308 failed to acquire sound welded joints due to extensive slag remained in the bottom of groove. The highest microhardness (450 HV) was recorded on the coarse-grained heat-affected zone of the base metal for both joints. TypeⅡboundaries existed in the interfaces between austenitic weld metal and ferritic base metal. Compared to austenitic stainless steel weld metal, nickel-based weld metal possessed the ability to be significantly diluted by Q460 base metal.
S. Ibarra - One of the best experts on this subject based on the ideXlab platform.
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UNDERWATER WET-WELDING TECHNIQUES FOR REPAIR OF HIGHER-Carbon-Equivalent STEELS
Offshore Technology Conference, 2013Co-Authors: S. Ibarra, R.l. Reed, J.k. J.k. Smith, P.e. O'connor, C.e. GrubbsAbstract:The paper describes the problems and options for wet welding of offshore structures. It compares the advantages and disadvantages of using ferrite and nickel base wet welding electrodes. Recommendations are made for producing crack free wet welds in higher strength steels including temper bead techniques and the use of electrodes with thermit fluxes.
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The Structural Repair of a North Sea Platform Using Underwater Wet Welding Techniques
Offshore Technology Conference, 2013Co-Authors: S. Ibarra, R.l. Reed, J.k. J.k. Smith, I. Pachniuk, C.e. GrubbsAbstract:Underwater wet welding repair techniques using ferritic electrodes have, until recently, been limited to low strength steel with Carbon Equivalents below 0.4% because the fast quench that occurs after welding produces hard head affected zones susceptible to hydrogen cracking. This paper describes the first documented structural wet weld repair of the North Sea offshore platform constructed with steel that had a Carbon Equivalent greater than 0.40%. It describes the events that lead to the failure and documents the repair using underwater wet welding techniques.