Open AccessJournal Article
Temperature fields produced by traveling distributed heat sources
Thomas W. Eagar,N. S Tsai +1 more
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The solution of a traveling distributed heat source on a semi-infinite plate provides information about both the size and the shape of arc weld pools as mentioned in this paper, and the results indicate that both welding process variables (current, arc length and travel speed) and material parameters (thermal diffusivity) have significant effects on weld shape.Abstract:
The solution of a traveling distributed heat source on a semi-infinite plate provides information about both the size and the shape of arc weld pools. The results indicate that both welding process variables (current, arc length and travel speed) and material parameters (thermal diffusivity) have significant effects on weld shape. The theoretical predictions are compared with experimental results on carbon steels, stainless steel, titanium and aluminum with good agreement. 25 references, 23 figures, 1 table.read more
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Development of a surrogate model for high-fidelity laser powder-bed fusion using tensor train and gaussian process regression
Umesh Kizhakkinan,Pham Luu Trung Duong,Robert Laskowski,G. Vastola,David W. Rosen,Nagarajan Raghavan +5 more
TL;DR: In this article , a tensor train and Gaussian process regression (GPR) based methodology is proposed to develop a surrogate of the high-fidelity powder-scale model, which is used to generate the training data by simulating a microscale model of the powder-bed for different values of laser power.
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Influence of layer thickness on the printability of nickel alloy 718:A systematic process optimization framework
David Sh. L. Shoukr,Peter Morcos,Tayler W. Sundermann,Chad Yates,Jayesh R. Jain,Raymundo Arroyave,Ibrahim Karaman,Alaa Elwany +7 more
TL;DR: In this paper , the authors used a systematic framework developed by the authors that covers the entire scanning speed-laser power (v-P) parameter space, estimates the maximum hatch spacing at each v-P combination, and detects the good printability region.
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An Automated Fully-Computational Framework to Construct Printability Maps for Additively Manufactured Metal Alloys
Sofia Sheikh,Meelad Ranaiefar,Pejman Honarmandi,Brent Vela,Peter Morcos,David Sh. L. Shoukr,Raymundo Arroyave,Ibrahim Karaman,Alaa Elwany +8 more
TL;DR: In this paper , a fully computational framework is introduced to reduce the cost and effort of constructing printability maps, which combines CALPHAD models and a reduced-order model to predict material properties.
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Scanned Orbital Welding: Thermal Modeling and Lumped Adaptive Control
TL;DR: In this paper, a numerical simulation of the thermal field is developed for off-line analysis and a lumped thermal regulator of the heat-affected zone, employing infrared temperature feedback at a single spot, as well as standard PI, gain scheduling, and self-tuning control algorithms is tested.
References
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Heat treating and melting material with a scanning laser or electron beam
H. E. Cline,T. R. Anthony +1 more
TL;DR: In this paper, a thermal analysis for laser heating and melting materials is derived for a Gaussian source moving at a constant velocity, where the resulting temperature distribution, cooling rate distribution, and depth of melting are related to the laser spot size, velocity, and power level.
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Heat Intensity and Current Density Distributions at the Anode of High Current, Inert Gas Arcs
TL;DR: In this article, heat and current distributions at the anode of high current arcs in inert gas atmospheres were determined experimentally, and the experimental method consisted of splitting anode, measuring the heat flux and the current to one of the sections as a function of arc position relative to the splitting plane, and calculating therefrom the distribution functions.
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Analysis of Electrode Phenomena in the High-Current Arc
J. D. Cobine,E. E. Burger +1 more
TL;DR: In this article, the authors made an analysis of the phenomena at the electrodes of a high-current short-time arc and showed that the input power density to the anode spot is in the range 5×104 to 1×106 watts/cm2.
Convection in arc weld pools
TL;DR: In this paper, a mathematical model was developed to account for convection and temperature distributions in stationary arc weld pools driven by buoyancy, electromagnetic and surface tension forces, and it was shown that these forces dominate the flow behavior.
Effect of Selenium on GTAW Fusion Zone Geometry
C.R. Heiple,J.R. Roper +1 more
TL;DR: In this article, small additions of selenium to 21-6-9 stainless steel dramatically increase the depth/width ratio of bead-on-plate welds, which is consistent with a model for control of weld fusion zone geometry.