WJ Supplements - 2000


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  • A Method for Studying Weld Fusion Boundary Microstructure Evolution in Aluminum Alloys
    Nondendritic equiaxed grain microstructures were simulated in Li-bearing Alloy 2195.
    BY A. Kostrivas And J. C. Lippold
    Published January 2000
  • A Hot-Cracking Mitigation Technique for Welding High-Strength Aluminum Alloy
    The mechanical strain associated with hot cracking is significantly reduced with the introduction of a heat sink trailing a gas tungsten arc welding torch.
    BY Y. P. Yang, P. Dong, J. Zhang and X. Tian
    Published January 2000
  • An Investigation of the Interaction of a Molten Droplet with a Liquid Weld Pool Surface: A Computational and Experimental Approach
    The model shows droplet transfer strongly influences the flow pattern within the gas metal arc weld pool.
    BY M. H. Davies, M. Wahab and M. J. Painter
    Published January 2000
  • A New Approach to Improving the Properties of Brazed Joints
    Improvement of mechanical properties was achieved by a reinforcement composed of a system of parallel wires.
    BY B. Zorc and L. Kosec
    Published January 2000

  • Improved Ferrite Number Prediction in Stainless Steel Arc Welds Using Artificial Neural Networks - Part 1: Neural Network Development
    A neural network model is developed to improved the accuracy of current models of Ferrits Number prediction.
    BY J. M. Vitek, et al.
    Published February 2000
  • Improved Ferrite Number Prediction in Stainless Steel Arc Welds Using Artificial Neural Networks - Part 2: Neural Network Results
    The accuracy of a newly developed neural network model is tested and shows good results.
    BY J. M. Vitek, et al.
    Published February 2000
  • Fatigue Assessment of Spot Welds Based on local Stress Parameters
    A critical assessment of published stress formulas for spot welding is made.
    BY D. Radaj
    Published February 2000
  • Approximate Stress Intensity Factor and Notch Stress for Spot Welds
    An answer to the critical assessment by Radaj.
    BY S. Zhang
    Published February 2000

  • Reconsidering the Basicity of a FCAW Consumable - Part 1: Solidified Slag Composition of a FCAW Consumable as a Basicity Indicator
    A basicity index for a flux cored electrode was developed, taking into consideration the metal sheath, fill ingredients and weld metal composition.
    BY E. Baune, C. Bonnet and S. Liu
    Published March 2000
  • Reconsidering the Basicity of a FCAW Consumable - Part 2: Verification of the Flux/Slag Analysis Methodology for Weld Metal Oxygen Control
    The prediction model is verified by experimental results.
    BY E. Baune, C. Bonnet and S. Liu
    Published March 2000
  • Magneto-Fluid Dynamic Control of Seam Quality in CO2 Laser Beam Welding
    Magnetically supported laser beam welding features increased process stability.
    BY M. Kern, P. Berger and H. Hugel
    Published March 2000

  • The Welding of Structural Steels without Preheat
    Welding even thick sections of low-carbon-equivalent steels without costly preheat seems to be a real possibility by following the recommendation of this study.
    BY A. J. Kinsey
    Published April 2000
  • Image-Based Penetration Monitoring of CO2 Laser Beam Welding
    The weld pool, keyhole and plume generated by a laser beam were analyzed with a dual camera system to help predict penetration and control the process.
    BY R. K. Holbert, et al.
    Published April 2000
  • Evolution of Titanium Arc Weldment Macro and Microstructures - Modeling and Real Time Mapping of Phases
    A three-dimensional heat transfer model was developed to improve the prediction of temperature, themal cycles and size of die fusion zone in a gas tungsten arc weld on titanium.
    BY Z. Yang, et al.
    Published April 2000

  • Partially Melted Zone in Aluminum Welds - Liquation Mechanism and Directional Solidification
    An in-depth study of grain boundary liquation during gas metal arc welding aluminum offers insight into the prevention of hot cracking.
    BY C. Huang and S. Kou
    Published May 2000
  • Finite Element Analysis of Heat Flow in Single-Pass Arc Welds
    A finite element model is developed to predict melting efficiency as it relates to process variables.
    BY E. A. Bonifaz
    Published May 2000
  • Visualization of Marangoni Convection in Simulated Weld Pools
    A way of evaluating Marangoni convection in a weld pool was devised by substituting the arc with a laser beam defocused to the size of an arc.
    BY C. Limmaneevichitr and S. Kou
    Published May 2000

  • Stress Relaxation Study of HAZ Reheat Cracking in Type 347 Stainless Steel
    In an effort to better understand reheat cracking, specimens were reheated to various postweld heat treatment temperatures and a strain to cause yielding was applied.
    BY I. Li, et. al.
    Published June 2000
  • Effect of High Gravity on Weld Fusion Zone Shape
    Research into the effect of high-gravity, buoyancy-diven flow on weld pool size and shape improves our understanding of weldability.
    BY D. K. Aidun, et al.
    Published June 2000
  • Intelligent Methodology for Sensing, Modeling and Control of Pulsed GTAW: Part 1 - Bead-on-Plate Welding
    A new sensing system that images the front and back of the weld pool was tested with bead-on-plate welding.
    BY S. B. Chen, et al.
    Published June 2000
  • Intelligent Methodology for Sensing, Modeling and Control of Pulsed GTAW: Part 2 - Butt Joint Welding
    A predictive model and control scheme for gas tungsten arc welding of a butt joint were developed to control the width and shape of the weld pool.
    BY S. B. Chen, et al.
    Published June 2000

  • Force Characteristics of Resistance Spot Welding of Steels
    The effect of force change on spot weld quality is investigated under various welding conditions.
    BY H. Tang, et. al.
    Published July 2000
  • Spiral Defect Formation in Friction Welded Aluminum
    The influence on mechanical porperties of segregated particles of aluminum oxide trapped in friction-welded joints is examined.
    BY K Uenishi, et. al.
    Published July 2000
  • Cracking in Spot Welding Aluminum Alloy AA5754
    The mechanisms of cracking and crack heading are analyzed for spot-welded aluminum alloys.
    BY J. Senkara and H. Zhang
    Published July 2000
  • Electron Beam Welding of Magnesium AZ91D Plates
    The microstructural changes and their relationship to welding parameters were examined for electron-beam welded magnesium plates.
    BY BY A. Munitz, et. al.
    Published July 2000

  • The Influence of Working Fluid Physical Properties on Weld Qualification for In-Service Pipelines
    It is shown coohng rates for in-service welding of pipelines can be controlled by adjusting fluid properties and internal pressure conditions.
    BY R. J. Belanger And B. M. Patchett
    Published August 2000
  • Analysis of Aluminum Resistance Spot Welding Processes Using Coupled Finite Element Procedures
    A new model is developed to analyze electrode movement, dynamic resistance and changes in contact area for spot welding.
    BY X. Sun And P. Dong
    Published August 2000
  • Microstructural and Mechanical Characterization of Actively Brazed Alumina Tensile Specimens
    Materials and processing requirements for successful brazing of ceramics were investigated.
    BY F. M Hosting, et al.
    Published August 2000
  • Experiments to Simulate Effect of Marangoni Convection on Weld Pool Shape
    The relationship between weld pool shape and Peclet number was investigated to gain a greater understanding of weld pool convection.
    BY C. Linnnaneevichitr and S. Kou
    Published August 2000

  • Interfacial Reactions of Titanium and Aluminum during Diffusion Welding
    A preliminary investigation evaluated the feasibility of joining laminated composites using cold-roll bonding followed by diffusion welding.
    BY J-G. Luo and V. L. Acoff
    Published September 2000
  • Modeling of Projection Welding Processes Using Coupled Finite Element Analyses
    An analysis procedure was developed to study the electrical, thermal and mechanical aspects of projection welding.
    BY X. Sun
    Published September 2000
  • Analysis of an Arc Light Mechanism and Its Application in Sensing of the GTAW Process
    An extensive study into spectral phenomena leads to a model that correlates arc light radiation to welding variables.
    BY P.J. Li and Y. M. Zhang
    Published September 2000
  • Model Equation for Predicting the TensileStrength of Resistance-Brazed Joints
    A model is developed to predict tensile strength based on current variation during resistance brazing.
    BY K. Takeshita
    Published September 2000

  • Nature and Evolution of the Fusion Boundary in Ferritic-Austenitic Dissimilar Metal Welds - Part 2: On-Cooling Transformations
    An investigation into the microstructure at the fusion boundary leads to a better understanding of the cracking mechanism associated with dissimilar welds.
    BY T. W. Nelson, et al.
    Published October 2000
  • Microhardness Variations in HSLA-100 Welds Fabricated with New Ultra-Low-Carbon Weld Consumables
    Welding consumables with minor levels of carbon were tested with the prospect of eliminating preheat and interpass requirements when welding high-strength low-alloy steels.
    BY D. W. Moon, R. W. Fonda and G. Spanos
    Published October 2000
  • Prediction and Optimization of Weld Bead Volume for the Submerged Arc Process - Part 1
    Process variables as they affect submerged arc welding of pipe were studied and analyzed.
    BY V. Gunaraj and N. Murugan
    Published October 2000
  • Hydrogen Control in Steel Weld Metal by Means of Fluoride Additions in Welding Flux
    The reaction between hydrogen in the arc and fluoride in the slag of experimental flux cored welding electrodes was evaluated for reducing hydrogen cracking.
    BY M. Matsushita and S. Liu
    Published October 2000

  • Oxygen Equivalent Effects on the Mechanical Properties of Titanium Welds
    In an effort to find a reliable nondestructive test for titanium, the effects of carbon, oxygen, nitrogen and cooling rate on weld properties were studied.
    BY D. D. Harwig, et al.
    Published November 2000

  • Structural Characterization of C-Mn Steel Laser Beam Welded Joints with Powder Filler Metal
    Weld quality of butt-joint welds with beveled and square edges is investigated.
    BY S. Missori and A. Sill
    Published November 2000

  • Visualization of Marangoni Convection in Simulated Weld Pools Containing a Surface-Active Agent
    An experiment was devised to tind ff surface-tension-driven convection can be used to increase weld penetration.
    BY C. Limmaneevichitr and S. Kou
    Published November 2000

  • Prediction and Optimization of Weld Bead Volume for the Submerged Arc Process - Part 2
    Analytic models were developed to establish a relationship between process parameters and weld bead quality.
    BY V. Gunaraj and N. Murugan
    Published November 2000

  • A New Ferritic-Martensitic Stainless Steel Constitution Diagram
    The comparison of new equivalency formulae to existing formulae show improved accuracy in predicting microstructure of ferritic and martensitic stainless steel welds.
    BY M. C. Balmforth and J. C. Lippold
    Published December 2000

  • A Martensite Boundary on the WRC-1992 Diagram - Part 2: The Effect of Manganese
    A modification to the WRC- 1992 Diagram that takes into account martensite formation will allow the use of one diagram for FN prediction and dissimilar metal joining/cladding situations.
    BY D. J. Kotecki
    Published December 2000

  • The Stress-Relief Cracking Susceptibility of a New Ferritic Steel - Part 1: Single-Pass Heat-Affected Zone Simulations
    Under different heat inputs and postweld heat treatments, a new alloy is tested against a standard alloy used in high-temperature applications.
    BY J. G. Nawrocki, et al.
    Published December 2000

  • Control for Weld Penetration in VPPAW of Aluminum Alloys Using the Front Weld Pool Image Signal
    A model is developed of the relationship between the bottom diameter of a keyhole and the size of the keyhole weld pool as recorded with an image sensing system.
    BY B. Zheng, et al.
    Published December 2000