The study presents a coupled cellular automata (CA) approach for single track microstructure simulation laser conduction welding. A high-power CO2 beam (1000 W) traverses the substrate, with shaped by conventional optics, which produces Gaussian profile. process parameters produce shallow melt phase maintaining limited weld seam. stainless steel material 1.4404 was used as substrate grain size ...

Processes that use moving point heat sources to temporarily create localized melt pools (metal additive manufacture and fusion welding) have a flow phenomenon due the surface tension gradient. Surface of liquid metal reduces with temperature this, coupled high gradients associated sources, creates Marangoni convection in melt. The tends reduce change pool geometry (increases width but depth). C...

The development of transport infrastructure contributes to an increase in the demand for bridge structures, which leads need productivity their manufacture. overall welding is facilitated by volume welds performed a single pass. It proposed use two-electrode welding. Computer analysis such process has shown that acceptable fillet weld formation can be ensured rational parameters process, includ...

The bimodal microstructure, which comprises ultrafine grains (UFGs) forming along the melt pool boundary and relatively coarse inside pool, is a characteristic of Sc-Zr-modified Al–Mg-based alloy (Scalmalloy) microstructure manufactured using laser powder bed fusion (LPBF). Focusing on this microstructural feature, we investigated improvement in mechanical properties LPBF-fabricated Scalmalloy ...

The existence of partial melt is frequently invoked to explain geophysical anomalies such as low seismic wave velocity and high electrical conductivity. I review various experimental and theoretical studies to evaluate the plausibility of this explanation. In order for a partial melt model to work, not only the presence of melt, but also the presence of appropriate amount of melt needs to be ex...

acrylamide was grafted in low density polyethylene during melt processing in the presence of a free radical initiator using a torque rheometer in a closed system. effects of processing time, acrylamide and benzoyl peroxide concentrations were studied. ftir studies revealed that the degree of grafting increased by an increase in acrylamide concentration. maximum grafting was obtained at 7 minute...

[1] The Greenland ice sheet has been the focus of much attention recently because of increasing melt in response to regional climate warming and can be studied using Moderate Resolution Imaging Spectroradiometer (MODIS) and Quick Scatterometer (QuikSCAT) data. To improve our ability to measure surface melt, we use remote sensing data products to study surface and near-surface melt characteristi...

A model for the formation of granitoid systems is developed involving melt production spatially below a rising isotherm that defines melt initiation. Production of the melt volumes necessary to form granitoid complexes within 10(4)-10(7) years demands control of the isotherm velocity by melt advection. This velocity is one control on the melt flux generated spatially just above the melt isother...

Liquid column was a common problem in ultra-high power fiber laser-arc hybrid welding (UHLAHW) process, which has an adverse effect on the stability and weld formation. Hence, influence of parameters behavior liquid investigated systematically, including laser arc recombination power, speed. As result, violent rising under suppressed markedly after addition. However, it hard to restrain upturn ...