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in subjects: "Welded Joints"

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Field radiography using 100 Ci of Co-60 without interrupting adjacent manufacturing operations

Radiography is the primary method of Nondestructive Examination recognized by the ASME B and PV Code as providing objective evidence of volumetric examination of the pressure boundary welds that are present in the Clinch River Breeder Reactor Program (CRBRP) Steam Generator. In order to support the steam generator production schedule, the radiographic examinations must be performed without interrupting any other manufacturing or inspection operations taking place within a 20-ft radius from the … more

Date: January 1, 1979

Creator: Donnelly, C.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of joining techniques for advanced austenitic alloys

Modified Alloys 316 and 800H, designed for high temperature service, have been developed at Oak Ridge National Laboratory. Assessment of the weldability of the advanced austenitic alloys has been conducted at the University of Tennessee. Four aspects of weldability of the advanced austenitic alloys were included in the investigation.

Date: May 1, 1991

Creator: Lundin, C. D.; Qiao, C. Y. P.; Kikuchi, Y.; Shi, C. & Gill, T. P. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evaluation of weldments in Type 21-6-9 stainless steel for Compact Ignition Tokamak structural applications: Phase 1

Primary design considerations for the Compact Ignition Tokamak toroidal field-coil cases are yield strength and toughness in the temperature range from 77 to 300 K. Type 21-6-9 stainless steel, also still known by its original Armco Steel Company trade name Nitronic 40, is the proposed alloy for this application. It has high yield strength and usually adequate base metal toughness, but weldments in thick sections have not been adequately characterized in terms of mechanical properties or hot-cr… more

Date: June 1, 1991

Creator: Alexander, D. J.; Goodwin, G. M. & Bloom, E. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effect of high aspect ratio on ITER maintenance design

The International Thermonuclear Experimental Reactor (ITER) baseline machine configuration and auxiliary systems design specify maintainability and repairability as fundamental requirements. Two important maintenance requirements for ITER are a device that is fully remotely maintainable, with the provision for hands-on maintenance wherever possible, and the ability to maintain components with short lives or high failure rates without moving other components or disturbing the machine's internal … more

Date: January 1, 1991

Creator: Herrick, T.J.; Davis, F.C.; Hollis, M.J. & Lousteau, D.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ultrasonic inspection techniques for two weld closures proposed for RSSF waste storage casks

One method being considered for interim storage of high-level radioactive waste materials is to place these materials in large sealed stainless steel canisters and subsequently store these canisters in a second sealed steel storage cask. Weld procedures are proposed as the closure or seal for these vessels. Inspection of these closures to assure initial and long-term integrity of the closure welds presents a challenge to nondestructive testing. The environment is thermally (400 to 1000/sup 0/F)… more

Date: January 1, 1978

Creator: Doctor, S. R. & Morris, C. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Microstructural and solidification cracking evaluation of electron beam welds in 304L

Weld hot cracking of stainless steels is a major materials-related problem in the welding industry. This present investigation evaluates the crack susceptibility of highly-constrained EB welds made in materials whose DeLong ferrite potentials range from zero to nine FN. In addition, the effect of piece part strength level on cracking is examined. This study has revealed that these deep penetration EB welds have regions that solidify as primary austenite, even when the DeLong ferrite potential i… more

Date: January 1, 1991

Creator: Sturgill, P.L.; Campbell, R.D. & Henningsen, J.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electron-beam fusion welding of beryllium

Ingot-sheet beryllium (Be) having three different chemistries and three different thicknesses was fusion-welded by the electron-beam process. Several different preheats were used to obtain 100% penetration and crack-free welds. Cracking susceptability was found to be related to aluminum (Al) content; the higher Al-content material was most susceptable. However, adequate preheat allowed full penetration and crack-free welds to be made in all materials tested. The effect of a post-weld heat treat… more

Date: January 1, 1978

Creator: Campbell, R. P.; Dixon, R. D. & Liby, A. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Assessment of lamellar tearing

Information on lamellar tearing is summarized and related to proposed ASME Code requirements. Lamellar tearing is characterized as a complex phenomenon related to poor short transverse ductility and through-thickness strain. The material, welding, and design variables that affect lamellar tearing are shown to be complex and interrelated. The commonly reported tests for assessing material susceptibility are described, with the controversy over their validity being carefully detailed. Although th… more

Date: March 1, 1978

Creator: McEnerney, J.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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CRBRP reactor system shield design and impact of new materials irradiation damage data

Structural materials radiation damage data have received considerable attention in the design of LMFBR permanent reactor structures. A recent FFTF/CRBRP structural materials irradiation experiment, conducted as part of the national program plan for irradiation effects on mechanical properties of LMFBR out-of-core structural materials, has found engineering application in setting energy-dependent neutron exposure limits of irradiated structures. This paper describes the impact of the new irradia… more

Date: January 1, 1980

Creator: Wrights, G.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Weld Penetration and Defect Control

Highly engineered designs increasingly require the use of improved materials and sophisticated manufacturing techniques. To obtain optimal performance from these engineered products, improved weld properties and joint reliability are a necessarily. This requirement for improved weld performance and reliability has led to the development of high-performance welding systems in which pre-programmed parameters are specified before any welding takes place. These automated systems however lack the ab… more

Date: May 15, 1992

Creator: Chin, Bryan A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Acoustic Emission Weld Monitoring of Nuclear Components

Acoustic emission monitoring augments other nondestructive testing methods and is sometimes applicable when other tests cannot be applied. This is, in part, due to the high sensitivity of acoustic emission monitoring. Acoustic emission monitoring is only sensitive to active flaw-growth, however, and will not detect a flaw in equilibrium. This paper describes the application of acoustic emission monitoring to nuclear reactor fuel pin end closure welds and other weldments of the reactor piping.

Date: January 25, 1972

Creator: Romrell, D. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Evaluation of Inservice Inspection Examinatiions

In order to evaluate the effectiveness of Section 11, Division 1, Rules for Inservice Inspection of Nuclear Power Plant Components,'' of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code examinations, 26 inservice inspection (ISI) summary reports from 24 facilities were reviewed. It was found that these ASME Code examinations and tests are instrumental in revealing indications and defects in welds and plant components. In addition, this study uncovered that fac… more

Date: May 1990

Creator: Aldrich, D. A. & Cook, J. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Three-dimensional temperature history of a multipass filled weldment. Part 2. [HEATINGS]

Computer simulation of the three-dimensional temperature history in a multipass filled weldment was attempted by modifying a transient heat transfer code, HEATING5. The model includes temperature-dependent physical parameters, radiation and convection heat losses, turbulent and laminar convection in the molten pool, and variable arc velocity, intensity, and weld geometry. The model requires approximately 28 CPU min to simulate one second of welding. 15 figures, 8 tables.

Date: December 21, 1976

Creator: Pinkowish, J.A. & Whitman, P.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measured residual stresses in overlay pipe weldments removed from service

Surface and throughwall residual stresses were measured on an elbow-to-pipe weldment that had been removed from the Hatch-2 reactor about a year after the application of a weld overlay. The results were compared with experimental measurements on three mock-up weldments and with finite-element calculations. The comparison shows that there are significant differences in the form and magnitude of the residual stress distributions. However, even after more than a year of service, the residual stres… more

Date: February 1, 1985

Creator: Shack, W.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Spatial averaging algorithms for ultrasonic inspection of austenitic stainless steel welds

Interpretation of ultrasonic inspection data from stainless steel welds is difficult because the signal-to-noise ratio is very low. The three main reasons for this are the granular structure of the weld, the high attenuation of stainless steel, and electronic noise. Averaging in time at the same position in space reduces electronic noise, but does not reduce ultrasonic noise from grain boundary scattering. Averaging wave-forms from different spatial positions helps reduce grain noise, but desir… more

Date: April 7, 1980

Creator: Horn, J. E.; Cooper, C.S. & Michaels, T.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Probability of pipe fracture in the primary coolant loop of a PWR plant. Volume 9. PRAISE computer code user's manual. Load Combination Program Project I final report

The PRAISE (Piping Reliability Analysis Including Seismic Events) computer code estimates the influence of earthquakes on the probability of failure at a weld joint in the primary coolant system of a pressurized water reactor. Failure, either a through-wall defect (leak) or a complete pipe severance (a large-LOCA), is assumed to be caused by fatigue crack growth of an as-fabricated interior surface circumferential defect. These defects are assumed to be two-dimensional and semi-elliptical in sh… more

Date: June 1, 1981

Creator: Lim, E.Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Milliwatt generator heat source. Progress report, July-December 1981

As part of the Milliwatt Generator (MWG) Program, a second series of pressure burst capsules welded offsite was tested; the resulting data indicate that the welds are very similar to those in the first series of capsules. Sufficient hardware was fabricated to meet all scheduled commitments. To provide a unit for feasibility testing, a heat source clad with Hastelloy C was reclad with Inconel 600. Forming development tests on Inconel 600 were conducted with favorable results. A QAS-3 survey was … more

Date: April 8, 1982

Creator: Mershad, E.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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WSRC Reactor Tank Inspection Program (RTIP) status report

Westinghouse Savannah River Company (WSRC) recently completed the initial phase of nondestructive inspections of the Savannah River Site's (SRS) reactor tanks. This program required almost three years to be conceptualized, fabricated, and tested. An additional 20 months were required to complete the NDE inspection of the P, K and L reactor tanks. The overall cost of the program to date is approximately $25 MM. This status report will address: (1) A brief review of the RTIP program and the const… more

Date: January 1, 1992

Creator: Loibl, M. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Sealed storage cask concept. Cask closure concept evaluation. Interim report

A program was conducted to evaluate four candidate storage cask closure configurations. Four major areas were evaluated to provide a basis for selection of an acceptable closure(s). These were: (1) weldability, (2) suitability of available nondestructive examination methods for determining weld soundness, (3) closure configuration structural soundness, and (4) economics. A relative ranking of each closure configuration was made using the study results. The corner weld configuration was ranked a… more

Date: October 1, 1975

Creator: Moore, E. L. & O'Brien, W. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Finite element analysis for the initiation of lamellar tearing in welded joints

A numerical procedure using the finite element method is presented for predicting the initiation of lamellar tearing in fillet welded T-joints commonly employed in large structures. Starting with a prescribed geometry, the welding process is approximated by a known time-dependent volumetric heat source which simulates the arc heating and deposition of liquid metal. The transient nonlinear thermal and stress problems are then solved using finite element computer codes. Results of the elastic-pla… more

Date: January 1, 1980

Creator: Krieg, R. D. & Thomas, R. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Remote leak detection for the TFTR

The planned design for the TFTR (TOKAMAK Fusion Test Reactor) remote leak detection system consists of a central console which controls the application of tracer gas to possible leak areas. Seals are tested by admitting tracer gas to machined cavities on the atmospheric side of the seal. The tracer gas is brought to the seal cavity by /sup 1///sub 8/-inch diameter tubes which connect to local tracer gas/vacuum manifolds located outside the protective radiation shielding. Vacuum shell walls and … more

Date: January 1, 1977

Creator: Walthers, C.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of the cryogenic mechanical properties of low thermal-expansion superalloys

Four Fe-based superalloys, JBK-75, Incoloy 903, Incoloy 905, and Incoloy 909 were evaluated as tube materials for ICCS Nb/sub 3/Sn superconductors. Evaluation consisted of 4-K tensile and elastic-plastic fracture-toughness testing, and a microstructural characterization of unwelded and autogenously gas-tungsten-arc welded sheet given a simulated postweld processing treatment of 15% cold reduction by rolling followed by a Nb/sub 3/Sn-reaction heat treatment of 96 hours at 700/sup 0/C plus 48 hou… more

Date: July 30, 1985

Creator: Summers, L.T. & Dalder, E.N.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Structural analysis of a reflux pool-boiler solar receiver

Coupled thermal-structural finite element calculations of a reflux pool-boiler solar receiver were performed to characterize the operating stresses and to address issues affecting the service life of the receiver. Analyses performed using shell elements provided information for receiver material selection and design optimization. Calculations based on linear elastic fracture mechanics principles were performed using continuum elements to assess the vulnerability of a seam-weld to fatigue crack … more

Date: June 1, 1991

Creator: Hoffman, E. L. & Stone, C. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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/sup 238/Pu fuel form processes. Quarterly report, April-June 1981

An analytical program has been started to determine the cause of cracking in DOP-26 iridium alloy during welding of GPHS clad vent sets. Analyses revealed that (1) intergranular cracking in the interior weld bead occurs in the heat-affected zone adjacent to the arc quench taper and at weld edges, (2) grain surfaces exposed by cracking exhibit a characteristic ridge network topography, and (3) no elements that could cause hot shortness were detected in the ridge networks.

Date: December 1, 1981

Creator: Folger, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department