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Wagner S.,Schweisstechnische Lehr und Versuchsanstalt Halle GmbH | Kranz B.,Schweisstechnische Lehr und Versuchsanstalt Halle GmbH | Wolski U.,Schweisstechnische Lehr und Versuchsanstalt Halle GmbH | Muglitz J.,ZIS Industrietechnik GmbH | Krink V.,Kjellberg Finsterwalde Plasma und Maschinen GmbH
Proc. of the Int. Conf. on Advances in Welding Science and Technology for Construction, Energy and Transportation, AWST 2010, held in Conj. with the 63rd Annual Assembly of IIW 2010 | Year: 2010

Plasma marking has effects on the static and fatigue strength of constructions. These effects must be known for a dimensioning of constructions. The objective of intensive investigations was to clarify these relations. For these specimens were plasma marked varying the plasma current to produce high quality labelled surfaces under industrial aspects. The material testing of these specimens includes macro-sections for determining the shape, mark depth and hardness in heat affected areas. Impact and tensile tests have been carried out to characterise the static strength. Finally, S-N curves were determined to check the fatigue behaviour compared to non-marked specimens as well as with the results of numerous punch marked steels and with the IIW recommendations for fatigue design of welded joints and components.

Machova K.,TU Dresden | Zschetzsche J.,TU Dresden | Fussel U.,TU Dresden | Friedrich Ch.,TU Dresden | And 3 more authors.
Kettenwirk-Praxis | Year: 2013

The aim of the work was to develop an optimised technique for cutting textiles. The optical and mechanical characteristics of the materials for use in technical applications have restricted this process until now. The new plasma cutting process is an innovative cutting technique with the following advantages: • it expands and complements the range of applications of the thermal cutting process, • it is suitable for processing thermoplastic materials, glass fibres and spacer textiles, • it is economical and does not require any special health and safety measures to be put in place, • it is particularly suitable for small and medium-sized batches. Plasma cutting is quicker than an oscillating blade, although it is slower than a laser. The cutting speed is affected by the duration of heat transfer, melting, and subsequent cutting of the material. The heat from the plasma beam should be removed under the cut fabric to avoid heat from building up in the material and to prevent the edges from being damaged. This applies to materials having a low air permeability in particular, e. g. films or consolidated components. Heat build-up still occurs with highly conductive materials, such as carbon. Future work will concentrate on optimising the process of cooling the cut material to obtain an even better cutting result. Using different mixtures and combinations of gases would also be feasible to further reduce the build-up of heat in the cutting zone and to increase the cutting speed.

Lohse M.,TU Dresden | Fussel U.,TU Dresden | Schuster H.,Kjellberg Finsterwalde Plasma und Maschinen GmbH | Friedel J.,Kjellberg Finsterwalde Plasma und Maschinen GmbH | And 2 more authors.
Welding in the World | Year: 2013

In this paper, the results for keyhole welding of stainless steel 1.4301 and mild steel 1.0117 with a cathode focussed gas tungsten arc process are presented. These tests were carried out in preparation for welding the root faces of Y- or double V-groove weld preparations of thick metal plates. Welded plate thicknesses range from 6 to 10 mm for stainless steels and 6 to 12 mm for mild steels. Welding speeds are in the range of 20 to 115 cm/min at currents from 400 to 800 A. Especially for stainless steel, a big range of applicable and stable process parameters could be found. The process also works fine for mild steel even though the achievable parameter range is smaller. © 2013 International Institute of Welding.

Machova K.,TU Dresden | Zschetzsche J.,TU Dresden | Fiissel U.,TU Dresden | Friedrich C.,TU Dresden | And 3 more authors.
Technische Textilien | Year: 2011

The trend in almost all product development is to aim for product properties such as "easier, faster, more effective". The matrix materials reinforced with fibers or textiles will be increasingly used to meet these industry demands. Reinforced concrete, reinforced plastics, reinforced metals are innovative materials, which have better mechanical properties despite lower dimensions and often. The reinforcement is achieved by short or endless fibers. Endless reinforcing fibers are often processed as a tissue and combined with thermoplastic polymers, which built the matrix after heating. The offerings of mixtures tissues from glass fibers and various polymers are sufficiently available on the market.

Kjellberg Finsterwalde Plasma Und Maschinen Gmbh | Date: 2014-11-25

An electrode holder for an arc plasma torch includes an elongate holder body. The holder body includes a holder end for receiving an electrode and a hollow interior. An internal thread is positioned in the hollow interior for screwing in a rear end of said cooling tube. A cylindrical inner surface adjoins the internal thread for centering the cooling tube relative to the electrode holder.

Kjellberg Finsterwalde Plasma Und Maschinen GMBH | Date: 2010-05-31

A nozzle for a liquid-cooled plasma torch, comprising a nozzle bore for the exit of a plasma gas jet at a nozzle tip, a first portion, the outer surface of which is substantially cylindrical, and a second portion adjacent thereto towards the nozzle tip, the outer surface of which tapers substantially conically towards the nozzle tip, wherein at least one liquid supply groove and/or at least one liquid return groove is/are provided and extend over the second portion in the outer surface of the nozzle (4) towards the nozzle tip, and wherein the liquid supply groove or at least one of the liquid supply grooves and/or a liquid return groove or at least one of the liquid return grooves also extends/extend over part of the first portion, and there is in the first portion at least one groove which communicates with the liquid supply groove or at least one of the liquid supply grooves or with the liquid return groove or at least one of the liquid return grooves.

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