Residual Stress Distributions in Glass/Metal-Joints produced by Ultrasonic Torsion Welding
✍ Scribed by H. Kuckert; Ch. Born; G. Wagner; D. Eifler
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 424 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0933-5137
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✦ Synopsis
Abstract
The development and industrial application of efficient methods to join glass with metals which combine the individual advantages of both material groups are a great technological challenge. One research field of the Institute of Materials Science and Engineering is the production of glass/metal joints by means of ultrasound. Industrial applications are for example the sealing of glass vessels, fixtures in the vacuum technique or lens mounts. For this reason an industrial ultrasonic torsion welding system normally used for metal weldings was modified to be suitable for the demands of high sensitive glass/metal‐joints. With the developed welding system helium‐tight joints of glass and metals can be realized. In comparison to the conventional welding techniques [1] for glass like diffusion welding or adhesive bonding, ultrasonic torsion welding is characterized by very short welding times (< 1s) as well as low welding temperatures (< 450°C). Further advantages of this joining technique are the high automation potential and the environmental compatibility. Furthermore this technique can be applied under normal or specific atmospherical conditions. In spite of the low joining temperatures thermal residual stresses occur during the cooling of the joints due to the different coefficients of thermal expansion of the used materials [2]. In the present paper the measurement and calculation of the temperature distribution and the development of thermal residual stresses are described.