TPT May 2015

Technology News

Welder upgrade improves THDI EFD Induction has announced that its lower-power Weldac welders will feature an option for a 12-pulse diode rectifier. Previously, lower power Weldacs featured a 6-pulse rectifier. The new option has been shown to help reduce typical total harmonic distortion in current (THDI) from 25-30 per cent to approximately 11 per cent.

set by the Institute of Electrical and Electronics Engineers. EFD Induction solid-state Weldac welders offer high total efficiency measured from the mains inlet to the weld coil. This efficiency, together with the new 12-pulse diode rectifier, helps minimise power and cooling-water consumption. The new 12-pulse diode rectifier is available in single cabinet Weldacs with power outputs up to 550kW. EFD Induction’s high-power Weldac systems already offer the option of a 12-pulse rectifier.

The issue of harmonic distortion, or ‘harmonics’ as it is commonly called, is a growing cause of concern for power utilities and power systems managers. The proliferation of non-linear loads causes disturbances that impair equipment performance and affect total voltage supply. The new 12-pulse diode rectifier is available up to 550kW. An autotransformer can be supplied if

required, and an additional small external harmonic filter can also be installed in order to meet guidelines EFD Induction’s smaller solid-state Weldac welders now have the option of a 12-pulse diode rectifier

EFD Induction AS – Norway Fax: +47 3550 6010 Email: sales@no.efdgroup.net Website: www.efd-induction.com

Combining the advantages of axial and roll forming

most of the requirements here, offering distinct economic advantages. They may be produced with absolute reliability of processing and functionality. Especially forming geometries with O-rings are of particular significance in many products, as found in the automobile industry, for instance. Geometries which include a flange for fitment at a later stage are also often needed.” Forms of this type are ideally created using machines capable of both swaging and rolling. The specially developed transfluid combination systems automatically feed such external components during swaging as needed, accurately positioning and fastening them. This process also creates a pre-form, which may be required for any downstream rolling. Rolling produces the final geometry, creating surfaces for optimal application. “The tolerances, incidentally, are quite comparable with tolerances produced during machining,” explained Ms Flaeper. Since precision is required during rolling, the rolling head is CNC-

IN tube forming, time-consuming and expensive soldering and welding are often deployed, especially for tube connections. transfluid Maschinenbau is involved in finding a solution to the challenge of deploying more efficient methods. Managing director Stefanie Flaeper explained the technical options: “Forming geometries are the answer to

Ball heads swaged using transfluid forming technology

controlled and freely programmable in all axes of movement, even including overlap. Combination machines allow reliable and effective processing, even for large- diameter tubes. For smaller tube sizes, transfluid units are energy-efficient and are accurately driven by servomotors. All types of material may be processed. transfluid Maschinenbau GmbH – Germany

Fax: +49 2972 9715 11 Email: info@transfluid.de Website: www.transfluid.de

The transfluid ‘t form’ combination machine REB 645-5 SRM 622

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M ay 2015