Aluminum alloy welding suffers from problems such as solidification cracking and hydrogen-induced porosity, which are sufficiently severe to limit its potential applications. Because mitigated porosity incidence and solidification cracking are observed in aluminum welds using double pulsed gas metal arc welding (DP-GMAW), a comprehensive review of the mechanism is necessary, but absent from the...

Casting solidification brings to the shrinkage in the liquid state, solidification shrinkage and shrinkage in the solid state. Recently, technologies of die and gravity casting have increased the number of highly functional castings, which have been characterized with the very complex geometry. due to the different wall thickness in these castings, as well as the high solidification rates, prem...

This paper presents and discusses issues relevant to solidification of a chosen lead-free solder, the eutectic Sn-3.5%Ag, and its composite counterparts. Direct temperature recordings for the no-clean solder paste during the simulated reflow process revealed a significant amount of undercooling to occur prior to the initiation of solidification of the eutectic Sn-3.5%Ag solder, which is 6.5 C, ...

The physical and mechanical properties of an entirely (wrought alloys) or partly (cast dendritically solidified alloy strongly depend on the secondary dendrite arm spacing (SDAS). casting practice simulation solidification need a usable but simple method to calculate SDAS during at end as function cooling rate. Based many experiments, equation (empirical method) is known use local time, which c...

We present a new 2D phase-field model with anisotropy, applied to the dynamics and structure of free dendrite growth during solidification process of binary alloys under the action of magnetic field. The physics of solidification problem of Ni-Cu alloy such as conditions for crystal growth rate are discussed and show good qualitative agreement with numerical simulations. In order to improve the...

sented. This method can be applied to problems involving dendritic The process of crystal growth begins when one places a solidification. Our method consists of an implicit finite difference small seed of solid material into a surrounding bath of scheme for solving the heat equation and a level set approach undercooled liquid. Heat is released at the solid/liquid for capturing the front between...

\Ye present a general overview of a method of numerically modelling deep penetration welding processes using geometric constraints based on boundary information obtained from experiment. We consider general issues concerning accurate numerical calculation of temperature and velocity fields in regions of the meltpool where the flow of fluid is characterized by quasi-stationary Stokes flow. It is...

The twin-roll strip casting process is a typical steel-strip production method which combines continuous casting and hot rolling process. The production line from molten liquid steel to the final steel-strip is shortened and the production cost is reduced significantly compared to the conventional continuous casting. The twin-roll strip casting process can produce 1-5 mm thin steel strip direct...

DTA analysis was used to investigate the solidification reactions of alloy A319 with either 12 or 136 ppm of Sr added. Strontium does not affect primary solidification of (Al) dendrites but modifies the kinetics of the (Al)–Si eutectic. The effects of Sr level and of cooling rate on the characteristic temperatures for the (Al)–Si and other eutectic reactions are described.