Papers by Keyword: Ultrasonic Energy

Abstract: The process of wire electrical discharge machining (WEDM) of welded joints applied to stainless steel parts has raised important questions due to the effects on the machined surface and even the deep substrates. The paper proposes the possibility of improving working conditions by multiple activation of the effective processing space. The experimental research was performed under the conditions of simultaneous activation, both ultrasonic of the wire electrode and by magnetic activation of the dielectric liquid. The selection of the optimal parameters of magnetic activation was made using an experimental statistical modeling method, with a statistical analysis of the objective functions, using specialized software. The additional introduction of ultrasonic energy into the workspace has led to the rapid refresh of the dielectric fluid and the accelerated evacuation of eroded particles.

Abstract: Pigment dyes are vastly used in dyeing and printing of all kinds of fibers. Ultrasonic energy and cationic modifying were applied in pigment dyeing. The results shown that both of cationic modify and ultrasonic energy can make for better dyeing effect. And the ultrasonic energys condition is 30 °C in 5 min.

Abstract: The paper describes the research developed in order to assemble shape memory alloys using welding technologies with the aim to reduce the heat affected zone. It is shown that ultrasonic welding can be solutions that could be considered for this purpose. Experiments on welding shape memory alloys have been performed on bulk and rapid solidified ribbons and the interface has been characterized using microstructural observations. The investigations show the difficulties in assembling microfabricated shape memory ribbons with conventional sonotrode/anvil solutions due to the limited thickness of the ribbons and the need to develop microstriations on the surface of the ultrasonic welding tools. It is however considered that ultrasonic welding can be a solution for joining shape memory alloys in similar or dissimilar architectures.

Abstract: Submicron silica powders were prepared by w/o emulsion method using inexpensive sodium silicate, ammonium sulfate and Triton N-57 as SiO2 source, precipitant and emulsifier, respectively. Nano-sized silica powders with narrow size distribution were prepared at a low temperature of 25°C for 1h by ultrasonic irradiation of the reactants using a commercial ultrasonic cleaner operating at a frequency of 47kHz, whereas silica powders with larger size and broad size distribution were synthesized using the same reactants at the same temperature and for the same time by the conventional process without ultrasounds. The particle size and size distribution of the silica powders obtained by the ultrasonic process were smaller and narrower than those by the conventional process, indicating that the application of ultrasound in the synthesis of silica powders by the w/o emulsion method is an efficient way to have powders with smaller and narrower particle size distribution.