【摘 要】
：
A mechanism of excited arc to be an controlled "ultrasonic emission source" is described. An developed electrical source with an certain frequency bandwidth for
【机 构】
：
Department of Mechanical Engineering
论文部分内容阅读
A mechanism of excited arc to be an controlled "ultrasonic emission source" is described. An developed electrical source with an certain frequency bandwidth for the purpose of the arc-excited is connected with an conventional welding power supply through coupling the cables for the experiment. Some resonant frequency bands for the arc-excited ultrasonic are discovered in the welding process, and its frequency, amplitude and phaseshift are recorded. This principle demonstrates that arc can be used not only for a thermal source, but also for an ultrasonic emission source, which may be extent to the industrial application in some new ways, such as for automatic welding process control and quality inspection.
其他文献
冷冻干燥是获得优质脱水产品最好的方法，已在食品药品等领域获得了广泛应用。主要综述近年来国内外对真空冷冻干燥技术的研究现状，分析了现有的冷冻干燥数学模型以及过程参数对
Chemical and physical properties of poly(vinyl alcohol)(PVA) hydrogel films were investigated as a function of production factors.The experimental results show
Common object request broker architecture (CORBA) provides the framework and the mechanism for distributed object operation. It can also be applied to computer
As CAD/CAM becomes more and more popular, efficiently managing large amounts of engineering data becomes essential for improving design efficiency and quality.
A solid phase radioimmunoassay for free triiodothyroninein serum was developed based on double-antibody coated tubes.The method was turned out to be reliable wi
Taking electrolytic lapping stainless steel for example, the principle of electrolytic lapping with a magnetic field is described, the movement of charged parti
The phase transformation of Cu-23at.%Zn-11at.% Al alloy from about 5℃ to 25℃ has been studied by means of the positron annihilation and transmission electron
大学生综合素质的提高一直是高等教育工作的重点，也是21世纪教育工作的重要目标之一，随着时代的进步以及教育教学观念的改变，人才培养模式也要与时俱进。为了适应化工科学技术和
To explore the biological properties of a new neutralmyocardial imaging agent 99mTcN(NOEt)2, preparationand characterization of 99mTcN(NOEt)2, kinetics of blood
Gradual faults and abrupt faults of mechanical systems are differentiated by variation patterns of state var ibles.After the reasons of abrupt faults are analyz