The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
T. W. Eagar - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetically and Thermally Driven Flow Phenomena in Electroslag Welding
2015Co-Authors: A. H. Dilawari, J. Szekely, T. W. EagarAbstract:Through the statement of Maxwell's equations, the turbulent Navier-Stokes equations, and the convective heat balance equation, a mathematical model has been proposed for the Electroslag Welding Process. In the formulation, allowance has been made {or both etee-tromagnetic and b.uoyancy forces for driving the slag and the metal flow. The principal finding of the work is that convection in the molten slag region has a marked effect on the heat transfer process. For a rectangular geometry, using plate electrodes, the flow field is dr iven by buoyancy forces, the circulating flow is less intense, and the thermal effi-ciency of the process is improved. In contrast, for wire electrodes (approximated by a cylindrical geometry) the flow is driven by electromagnetic forces and a substantial part of the thermal energy is dissipated to the plates. 1
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MATHEHATICAL NODELING OF THE TEHPERATURE PROFILES AND WELD DILUTION IN Electroslag Welding OF STEEL PLATES
2015Co-Authors: Deb T. Roy, J. Szekely, T. W. EagarAbstract:This paper describes a calculation procedure for the detailed predic-tion of temperature profiles and weld dilution in the Electroslag Welding of mild steel plates. The temperature profiles in the liquid slag and the liquid metal regions are calculated in three dimensions under steady state conditions. The values of the heat generation patterns needed in the tem-perature profile calculation are computed by solving a three dimensional electric field equation in the liquid slag region. The weld dilution is computed as a function of time by solving a transient three dimensional heat flow equation for the base plate. Good agreement achieved between the predicted temperature profiles in the base plate artd the available measurements illustrate the capabilities of the model. Reasonable agreement has also been obtained between the measurements and the predicted values of dilution as affected by changes in the plate gap and the weld speed
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A PARANETRIC STlJDY OF THE Electroslag Welding PROCESS
2015Co-Authors: W.s. Ricci, T. W. EagarAbstract:Screening experiments were conducted on Electroslag welds to statistically evaluate the effect of i ndependent process variables upon dependent process responses consisting of heat affected zone size, dilution, form factor, Welding speed and heat input. The results of multiple el ectrode Electroslag welds made with and without the use of a supplementary filler material are presented as well. Methods of reducing the size of the heat affected zone while maintaining an acceptable form factor were determined. It can be concluded that significant reductions in heat affected zone size, with resultant improveillents in weldment impact properties, are not to be expected when the heat i npu t to the process is reduced by as much as a factor of five
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l J FUNDAMENTAL ASPECTS OF Electroslag Welding OF TITANIUM ALLOYS
2015Co-Authors: J. H. Devletian, W E Wood, S. J. Chen, T. W. EagarAbstract:For the first time outside the Soviet Union, the consumab 1 e guide ESW process has been success-fully applied to join thick section (typically 25 mm [1"] and 50 mm [2"]) Ti-6Al-4V alloy plates. The Welding procedures, weld-joint mechanical properties and microstructure of Ti-6Al-4V weld joints deposited by ESW were i nvestigated. Due to the strongly ionic proper-ties of the molten CaF2 flux, only AC power could be used for successful ESW of Ti-6Al-4V plates. Weld metal properties were dependent upon the purity of the consumab 1 es and mi era-structure. DUE TO THE UNIQUE CHEMICAL and electrical prop-erties of titanium, commercial Welding processes used t o join thick section titanium alloys (> 25 mm [1"] thick) have been limited to gas tungsten arc Welding, plasma arc Welding and electron beam Welding. For thick plate Welding, these processes are either excessively labor-intensive or impracti ca 1. Consumable guide Electroslag Welding (ESW) has l ong been recognized as the most cost-effective method to weld thick-section steel and stainless steel plate; however, ESW had previ-ously never been successfully applied to titan-ium alloys except in the Soviet Union. Since the 1 ate 1950 ' s, the only known techno 1 ogy for ESW of titanium alloys was that reported by Gurevich and others in the Soviet technical literature [1-6]. The unique problems associated with ESW of titanium alloys are a result of titanium's high chemical reactivity and relatively high elec-trical resistivity at elevated temperatures. The high resistivity causes the filler metal to melt back due to excessive ohmic heating. Ti-tanium's high reactivity requires fluxes to have an exceedingly low oxygen potential. Unfortu-nately, many halide fluxes, though free o
F. Matsuda - One of the best experts on this subject based on the ideXlab platform.
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Inhomogeneity of impact properties of Electroslag weld metal in constructional steels : improvement of toughness properties of ESW weld metal in constructional steels (1st Report)
Welding International, 1996Co-Authors: S. Fujihara, A. Hatanaka, Y. Kikuchi, F. MatsudaAbstract:Summary The purpose of this paper is to clarify welded joint performance, especially the impact properties of the weld metal produced by heavy‐current Electroslag Welding (ESW) and submerged‐arc Welding (SAW), with special reference to the high heat input Welding processes generally applied in the fabrication of four‐sided thick‐plate box columns. Two types of SM490A 40 mm thick plates were used in the tests. The results obtained may be summarised as follows: The impact properties of the high heat input weld metal produced under standard conditions (thickness of 40 mm) are generally such that ESW has a lower absorbed energy value (vE value) than SAW. The impact value of ESW high heat input weld metal is non‐uniform, and distinctive impact properties are found. That is to say, the vE value of the weld metal core is lower than that of the weld metal rim. ESW weld metal macrostructures have a non‐uniform morphology in both the core and rim. That is to say, a fine‐grained columnar zone is generated in the cor...
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Differences in impact values of core and rim in Electroslag weld metal: Improvement of toughness properties in ESW weld metal in constructional steels (2nd Report)
Welding International, 1996Co-Authors: S. Fujihara, A. Hatanaka, Y. Kikuchi, F. MatsudaAbstract:Summary The purpose of this paper is to investigate the impact properties of weld metal produced under different Welding conditions with special reference to Electroslag Welding (ESW) as a high heat input Welding process generally applied in the fabrication of four‐sided thick‐plate box columns for general multi‐storey buildings. The paper focuses in particular on the impact properties of ESW weld metal at its centre (core (C)) and periphery (rim (R)). The results obtained may be summarised as follows: The vE value of the weld metal core is lower than that of the weld metal rim. The absorbed energy transition temperature is also higher.The vE values of the weld metal core and rim altered with a change in the Welding heat input Q (varied at six levels in the 10.1 ∼ 126.7 kJ/mm range), generally decreasing with an increasing heat input. The vE value of the core is lower than that of the rim. In the weld metal produced at the maximum heat input (126.7 kJ/mm), however, the core and rim have much the same vE v...
R. B. Turpin - One of the best experts on this subject based on the ideXlab platform.
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Electroslag Welding of an advanced double-hull-design ship
Welding Journal, 1997Co-Authors: J. H. Devletian, D. Singh, R. B. TurpinAbstract:Nonconsumable guide Electroslag Welding provides a highly cost-effective means to weld T-joints in double-hull ship construction
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INDUSTRIAL FIELD TRIALS OF OREGON GRADUATE INSTITUTE-DEVELOPED Electroslag Welding TECHNOLOGY. FINAL REPORT
1994Co-Authors: D G Atteridge, J. H. Devletian, R. B. Turpin, W E WoodAbstract:The primary objective of this program was to demonstrate that the Oregon Graduate Institute (OGI)-developed Electroslag Welding (ESW) technology cay be successfully implemented in commercial fabrication shops. Consequently, opportunity was provided to evaluate the transferability of ESW technology and to develop additional ESW mechanical property data from commercially fabricated weldments.
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REPAIR OF PROCESS-RELATED DEFECTS IN Electroslag Welding. FINAL REPORT
1994Co-Authors: W E Wood, D G Atteridge, J H Devietian, R. B. TurpinAbstract:The primary objectives of this program were to develop a Welding procedure for repair of Electroslag weldments and to determine if repair Welding influenced the fatigue strength of Electroslag weldments. Integral to this effort was the identification of the most likely types of defects, their causes, and the potential for effective repair. The Electroslag Welding (ESW) process is capable of producing a higher volume of defect-free weld deposit than other processes used for joining structural steel. When defects do occur, however, ESW is not well-suited for use as a repair process since it is limited to vertical position, single-pass, full-thickness Welding.
I. I. Sushchuk-slyusarenko - One of the best experts on this subject based on the ideXlab platform.
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Electroslag Welding : A status report
Welding Journal, 1997Co-Authors: Barry E. Paton, D. A. Dudko, K. A. Yushchenko, I. I. Lychko, I. I. Sushchuk-slyusarenkoAbstract:The current state of affairs of Electroslag Welding and the direction process development appears to be heading is examined
Wu Yongsheng - One of the best experts on this subject based on the ideXlab platform.
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Resarch Status on Vertical Welding Technics and Discussion on Vertical Welding of Manual SHS Welding
Hot Working Technology, 2011Co-Authors: Wu YongshengAbstract:Ten available vertical Welding technics of fusion Welding methods,such as MMAW(Manual metal arc Welding),VPPAW(Variable polarity plasma arc Welding),Semi-automatic CO2 shielded consumable electrode arc Welding,LBW(Laser beam Welding),vertical down Welding,STIG(Synchronization Tungsten inert gas arc Welding),ESW(Electroslag Welding),automatic CO2 shielded consumable electrode arc Welding,GMAW-EG or FCAW-EG(Electrogas Welding),self-melt vessel and self-shielded flux cored wire arc vertical Welding,were summed up.Meanwhile,the merits and drawbacks of those vertical Welding methods were analyzed.Finally,manual self-propagatin high-temperature synthesis Welding was introduced as well as the value of military affairs and civil,moreover,the present problems of manual SHS vertical Welding were discussed,and the further research orientation was pointed out.