Call us toll-free

phd thesis ultrasonic studies - …

(2013)A study of ultrasonic metal welding. PhD thesis, University of Glasgow.

Approximate price

Pages:

275 Words

$19,50

Phd Thesis Ultrasonic Studies - …

A new online ultrasonics components store has just opened at . Check their amazing prices for replacement ultrasonics components, fully compatible with the major manufacturers' originals at a fraction of the cost.

Thesis: References | PowerUltrasonics

Miodrag Prokic is an independent consultant, developer of new ultrasonics applications (such as ultrasonic cleaning in liquid CO2) and supplier of special ultrasonic systems for cleaning, sonochemistry and other applications. This is the new site I've just built for him, which includes a variety of technical articles and photos of modern ultrasonic cleaning systems.

Thesis download | PowerUltrasonics

Miodrag Prokic is an independent consultant, developer of new ultrasonics applications (such as ultrasonic cleaning in liquid CO2) and supplier of special ultrasonic systems for cleaning, sonochemistry and other applications. This is the new site I've just built for him, which includes a variety of technical articles and photos of modern ultrasonic cleaning systems.

Ultrasonic metal welding (USMW) has received significant attention in the past few years, and has become more reliable and suitable for a wide range of applications. In recent years, the technique has been extensively used due to the advent of component miniaturisation and improvements in producing lightweight components. There are a number ofadvantages for USMW, including greater efficiency and speed, longer tool life, higher accuracy and no filler or flux needed to be used. Thus the technique can be viewed asbeing environmently friendly. However, the technique is not inexpensive, primarily due to the high cost of welding tools. Therefore, the design and construction of a lateral-drive USMW system which is capable of joining thin metals is presented in this thesis. The fundamental aspect of this study is the design of an integrated spot welding horn, along with other welding components such as a stationary anvil, mounting holder, welding bed, as well as the relevant fixing tools and fixtures. High precision is required in the design of the components, and in particular the welding horn. Because the horn is responsible for transferring energy to the welding zone, specimens must be prevented from sliding during the joining process, and an appropriate clamping force must be applied which will ensureacceptable bonding. Many criteria have been examined to enhance the performance of a working horn. The horn excitation frequency has been matched to the transducer frequency, ensuring that the horn will be vibrated longitudinally close to 20 kHz, thereby allowing the tuned mode to be isolated from other non-tuned modes, which guarantees uniformity of the vibration amplitude at the horn working surface, high gain factor of 4.108, and the avoidance of any stress initiated at the points between connecting components. Examining of these criteria is essential in order to optimise the excitation of the horn and to transmit the energy with minimum dissipation. The analytical studies and the finite element (FE) modelling of the welding components were successfully simulated, from which the vibrational behaviour and dynamical characteristics of the system were precisely verified using experimental modal analysis (EMA). The welding stack (the horn connected to the transducer), welding components and fixtures were then set-up on the driving machine. The device was examined prior to welding to ensure the excitation at high vibration. Many tests were successfully conducted on the welding together of aluminium and copper in a number of different configurations using the ultrasonic metal spot welding system. Weld strength and quality were shown to depend on complex relations of process parameters such as clamping force, amplitude of vibration, welding time and input power. A series of weld combinations with different thicknesses and ii variations in metal conditions were studied. The results of the lap tested specimens suggest that the bond strength is sensitive to the relationships between clamping force andvibration amplitude. Overall, the weld strength results suggest that the Al-Al welds are stronger and more consistent in terms of weldability than the Cu-Cu welds. In the welding of dissimilar metals, stronger welds are produced when the aluminium specimen is placed on top and in contact with the horn tip, rather than the copper. The thickness and surface condition of the metals such as hardness, surface roughness and oxides, are significantlyaffect the weld strength. In welding of Al-Cu or Cu-Al, an increase in energy and time was necessary to generate an acceptable bond. The use of stepped amplitude profiling results in a pronounced increase in the weld strength improves consistency and enhances weldability. However, horn tip/specimen adhesion and specimen marking did not occur under certain conditions. The results of the FE simulation and experimental tensile tests, for the load displacement curves profiles, allow for good estimation of the maximum load and therefore weld strength. Weld quality of aluminium and copper specimens were observed through investigation of the deformed surfaces using Nomarsky optical microscopy and scanning electron microscopy (SEM). The results illustrate that good quality welds can be achived by joining specimens, regardless of the surface condition of the metal. The SEM confirmed that no mixing occurred by melting or fusion between intimate surfaces, which indicates that USMW occurs due to adhesion and cohesion mechanisms. Furthermore, xray diffraction confirms the percentage of morphology between Al and Cu, which indicates that largest weld formations are prevalent for those specimens that are softer and lower in hardness and surface roughness, regardless of the type of tempering.

MS Office Gurus - Pdf Phd Thesis Ultrasonic

A new online ultrasonics components store has just opened at . Check their amazing prices for replacement ultrasonics components, fully compatible with the major manufacturers' originals at a fraction of the cost.

Ultrasonic welding is used to weld thin sheet metals of similar or dissimilar couples of non-ferrous alloys like copper, aluminum and magnesium without addition of filler material resulting in high quality weld; it can count on a low energy consumption and on a joining mechanism based on a solid state plastic deformation which creates a very homogeneous metallic-structure between the base materials, free from pores & characterized by refined grains and confined inclusions’ Ultrasonic metal-welding can join also painted or covered sheet metals. Thin sheets of aluminium have been joined by means of Ultrasonic spot Welding. Results are particularly effective in order to evaluate the relevance of various phenomena influencing the lap joint technique obtained on thin aluminium by the application of Ultrasonic Metal Spot Welding (USMSW). The Present study considers the experiments carried out on the aluminum sheets joints at room temperature. The aim is to evaluate the factors influencing the lap joining technique, allowing a deep understanding of the phenomena and the possibility to keep them under control. In this project, the ultrasonic welding of aluminium sheets are carried out under different amplitude, weld pressure & weld time and their effect on tensile strength of ultrasonic welding is analyzed.

Order now
  • Doctoral Theses - Ultrasound Imaging Lab ..

    custom paper Phd Thesis Ultrasonic Studies how to write synopsis for phd best resume writing services 2014 ranked

  • romeo and juliet film 1996 essay Ultrasonic Study Thesis Ph.D

    Alleyne, The non-destructive testing of plates using ultrasonic Lamb waves, 1991

  • Thesis Ultrasonic - Nothing Lives In The World But …

    Phd Thesis Ultrasonic Studies

Order now
  • Kim

    "I have always been impressed by the quick turnaround and your thoroughness. Easily the most professional essay writing service on the web."

  • Paul

    "Your assistance and the first class service is much appreciated. My essay reads so well and without your help I'm sure I would have been marked down again on grammar and syntax."

  • Ellen

    "Thanks again for your excellent work with my assignments. No doubts you're true experts at what you do and very approachable."

  • Joyce

    "Very professional, cheap and friendly service. Thanks for writing two important essays for me, I wouldn't have written it myself because of the tight deadline."

  • Albert

    "Thanks for your cautious eye, attention to detail and overall superb service. Thanks to you, now I am confident that I can submit my term paper on time."

  • Mary

    "Thank you for the GREAT work you have done. Just wanted to tell that I'm very happy with my essay and will get back with more assignments soon."

Ready to tackle your homework?

Place an order