.... The relationship between the results, including the melting depth, ablation depth, and maximum temperature in both the liquid and solid, and the effects from the laser fluence and separation time between two pulses are investigated. The new results will be compared with that from the Clausius–Clapeyron equation...

..., a considerably high temperature must have been reached in the regions near the punched hole. The aluminum in this region was assumed to have melted and resolidified. These assumptions were affirmed by the following observations. Microscopic-size precipitates present in the unaffected base metal microstructure...

...P. S. Wei; C. L. Lin; H. J. Liu; C. N. Ting This study presents a numerical scenario for the effect of thermocapillary convection on the transient, two-dimensional molten pool shape during welding or melting. Tracing the melting process is necessary to achieve a better and more complete...

.... Particularly at the weldline region, locally different orientation is observed near the part surface, which is the result of fountain flow at the melt front. Also the effect of mold temperature on the flake orientation is presented. 03 04 2011 30 09 2011 11 01 2012 11 01 2012...

...S. Tsopanos; R. A. W. Mines; S. McKown; Y. Shen; W. J. Cantwell; W. Brooks; C. J. Sutcliffe The rapid manufacturing process of selective laser melting has been used to produce a series of stainless steel 316L microlattice structures. Laser power and laser exposure time are the two processing...

... element methods, is used to determine the melting isotherms due to heat inputs on overlapping crater profiles. Then, a hemispherical-capped crater profile is estimated by applying a recast plasma flushing efficiency to the amount of molten material bounded by the melting isotherm. Finally, the recast...

.... The cooling rates in the process and the spatial and temporal temperature profiles are numerically examined. The simulation results in conjunction with melting and crystallization kinetics of PLLA are used to understand the effect on sample crystallinity. The effects of laser fluence and annealing conditions...

.... However, some craters would still exist on the machined surface, which limits the further improvement of the surface quality of the machined workpieces. One possible solution is to apply external forces to workpieces by using high-frequency vibrations to smooth craters during melting and solidification...

... processing of high surface integrity for components, with improved physical and chemical properties and modified surface topography. 05 10 2006 17 04 2009 28 05 2009 corrosion resistance creep fatigue ion beam assisted deposition melting shock waves solidification wear...

...Seungwon Shin; Haseung Chung In this paper, we present a one-dimensional (1D) melting, evaporating, and resolidifying model describing the interaction of a scanning laser beam with a metal surface wherein the continuous and stepwise heat flux is applied. One set of 1D conduction equations, which...

... process, refereed to as double-electrode GMAW or DE-GMAW, thus has been developed to make it possible to increase the melting current while the base metal current can still be controlled at a desired level. This fundamental change provides an effective method to allow manufacturers to use high melting...

...Tiebing Chen; Yuwen Zhang A three-dimensional model of selective laser sintering of a two-component loose metal powder layer on top of previously sintered layers by a single-line laser scanning is presented. A temperature-transforming model is employed to model melting and resolidification...

... on steel substrates, by melting, e.g., preplated aluminum/nickel layers using a moving heat source such as a plasma arc. Such a source of Gaussian power distribution scans the surface of the coating, giving rise to the temperature evolution and component dissolution during the thermal melting and reaction...

... to extrude the melt is thus reduced by the amount F s ; (5) the new value of F is consequently used to calculate the real average velocity of the melt (see Fig. 6 (b)). The slip condition is taken into account in calculating the melt velocity. The algorithm applied for this case...

... differing scales that occur in the combustion and melt spaces. For example, the temperature in the aluminum melt is significantly cooler and changes less dramatically than the combustion temperatures. By interactively narrowing the color map range to correspond to the melt temperatures, the user can more...

... Manufacturing (SDM) process 11 12 . A welding-related deposition process used within SDM is termed microcasting and it involves depositing each layer as a sequence of discrete molten metal droplets. Droplets are formed by melting feedstock wire in a conventional gas metal arc welding torch. The droplets free...

... 2000 manufacturing processes forming processes melting stress analysis thermomechanical treatment drops Solid Freeform Fabrication (SFF) processes allow a computer-aided-design (CAD) model of a part to be transformed into a three-dimensional shape by building the part layer by layer...

...Franz-Josef Kahlen; Aravinda Kar This paper presents a set of process parameter selection rules to deposit a good metal part. A CO 2 laser is used to melt metal powder to achieve layer by layer deposition for fabricating three-dimensional parts. Dimensionless numbers characterizing this powder...