Open AccessJournal Article
Temperature fields produced by traveling distributed heat sources
Thomas W. Eagar,N. S Tsai +1 more
Reads0
Chats0
TLDR
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
Citations
More filters
Journal ArticleDOI
Solutions for modelling moving heat sources in a semi-infinite medium and applications to laser material processing
TL;DR: In this article, the analytical and numerical solution of the heat conduction equation for a localised moving heat source of any type for use in laser material processing, as welding, layered manufacturing and laser alloying, is derived from the solution of an instantaneous point heat source.
Journal ArticleDOI
Scaling laws for the additive manufacturing
TL;DR: In this paper, a simple thermal model of selective laser melting (SLM) process is evaluated and the temperature distribution in the sample is characterized by two dimensionless parameters: normalized enthalpy and the ratio of dwell time to the thermal diffusion time.
Journal ArticleDOI
Assessing Printability Maps in Additive Manufacturing of Metal Alloys
Luke Johnson,Mohamad Mahmoudi,Bing Zhang,Raiyan Seede,Xueqin Huang,Janine Tatjana Maier,Hans Jürgen Maier,Ibrahim Karaman,Alaa Elwany,Raymundo Arroyave +9 more
TL;DR: In this article, a methodology for predicting the printability of an alloy, subject to laser powder bed fusion additive manufacturing, is proposed, where regions in the process space associated with keyhole formation, balling, and lack of fusion are assumed to be strong functions of the geometry of the melt pool, which in turn is calculated for various combinations of laser power and scan speed via a Finite Element thermal model.
Journal ArticleDOI
An ultra-high strength martensitic steel fabricated using selective laser melting additive manufacturing: Densification, microstructure, and mechanical properties
Raiyan Seede,David Shoukr,Bing Zhang,Austin Whitt,Sean Gibbons,Philip Flater,Alaa Elwany,Raymundo Arroyave,Ibrahim Karaman +8 more
TL;DR: In this article, the effects of selective laser melting (SLM) parameters on the microstructure and mechanical properties of a recently discovered low alloy martensitic steel, AF9628, has been shown to exhibit strengths greater than 1.5 GPa with more than 10% tensile ductility, due to the formation of e-carbide phase.
Journal ArticleDOI
Data mining and statistical inference in selective laser melting
TL;DR: The results indicate that techniques from data mining and statistics can complement those from physical modeling to provide greater insight into complex processes such as selective laser melting.
References
More filters
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.