TPT November 2009

T echnology U pdate

Solid-state HF welder

The solid-state welder generation MOSWELD, based on a MOSFET-type inverter is able to work up to 450kHz. As typical working frequencies in tube welding process are in the range 300– 45kHz, MOSFETS are one of the most cost-effective choices for this application, the company claims. A system control board communicates with the inverter through optical fibres that are provided on the unit. The inverter is a current fed type and the output oscillating circuit is directly connected to the inverter. The company says MOSWELD has the following advantages: high efficiency; modular design; easymaintenance; it is short circuits proof; it has much lower voltages inside the cabinets compared with oscillator

tube technology; power components are not subject to obsolescence; it uses the same coils as the classic oscillator tube welder; and it offers long-term reliability. The modular structure and a complete diagnosis system allow quick and easy maintenance in order to reduce production stops. A special digital control system has been developed for an optimum phase locking (and then for an efficiency increasing) with the possibility to follow the change of frequency due to load variation in any working condition. EMMEDI Welding & Annealing Division

THE EMMEDI & Annealing Division of SAET GROUP has installed an advanced MOSWELD solid-state HF Welder 200kW output power at ZPT JSC Bulgaria. ZPT is a factory located in Straldzha, manufacturing carbon steel tubes. The new MOSWELD is installed on a tube mill producing tubes from 60mm to 150mm and WT up to 4mm.

of SAET GROUP – Italy Fax: +39 011 9974328 Email: info@saetgroup.com Website: www.saetgroup.com

 A solid-state HF welder has been installed at ZPT JSV Bulgaria

New two-axis hydraulic CNC contour turning unit

precision owing to their structural and modular construction. Repeated positioning and accuracy of 0.01mm in the axial direction and of 0.005mm in the radial direction are achieved. The hydraulic two axial CNC contour turning unit is operated by means of a newly-developed CNC control in conformance with the ISO standard. The operation and handling of this CNC control can be learned thanks to special easily and logically arranged programs, so that the machine operators can quickly and simply become acquainted with it and safe operation of the machine is achieved. Wolf – Germany Fax: +49 713593 69866 Email: info@wolf-maschinenbau.de Website: www.wolf-maschinenbau.de

THE development of the new CNC contour turning unit by Wolf opens up previously unsuspected fields of application as far as the production of small turned parts is concerned. This new CNC contour turning unit is already an integral part of the machine programme of Wolf and it is successfully used as an element of the TSM 280 rotary table transfer machine. Thanks to the reduction of costs and integration of particular production sequence in the hydraulic two axial CNC contour turning unit expensive and complicated form tools can be dispensed with. The use of simple, economic and standardised tools makes a quick tool change possible, whereby complex set ups are minimised. The TSM 280 rotary table transfer machines are machines of very high

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N ovember 2009

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