TPT May 2013

Technology News

TIG welding without control or mains voltage cables

5 to 250A when TIG welding and 10 to 250A when MMA welding, has been designed for on-site construction and extreme condition working environments ranging

MASTERTIG LT 250 is a new, lightweight (12.6kg), air cooled, electronic TIG/MMA welding power source from Kemppi UK Ltd that requires no control and mains voltage power cables as it is powered by a 35mm diameter connection cable from any single parent DC welding power source, including mobile welding generators, and MIG/MAG and MMA machines with a minimum of 40V pole voltage. Some suitably sized power sources will be able to run up to four LT250 units at full power at any one time. With a 90V open circuit voltage and rated at 250A for both TIG and MMA welding at 35% duty cycle, this high specification industrial TIG/MMAwelding machine, which has a welding range of

from high ambient temp- erature, humid climates up to 40°C, to sub-zero climates down to -20°C.

Other features include pre- and post- gas control, slope control timers and 2T and 4T torch switch latching. The new MasterTig LT 250 TIG/MMA welding power source from Kemppi

Precise HF and touch-arc ignition in both DC TIG and MMA welding makes welding easy, even with extended torch lengths up to 10m in length. The setting of welding parameters is simple, with clear digital displays to help, and the rear panel mounted gas control meter allows localised shielding gas flow control.

Kemppi (UK) Ltd – UK Fax: +44 845 6444202 Email: sales.uk@kemppi.com Website: www.kemppi.com

Hybrid drive system for processing machines

The hydraulic unit needs up to 20 per cent less volume of oil, and the required performance of the external cooler is correspondingly lower. The hybrid system also allows positioning accuracy. Since each consumer is supplied with a specific volume of oil, positions can be approached in the 1/10mm range. Via the electrical control, the consumption volumes are pre-selected or stored and via the rotational speed of the drive motor submitted precisely. The specially designed control system provides synchronisation of the desired speed in relation to the required volume, to ensure that no excess is generated. transfluid’s product portfolio offers solutions in five different machine categories, which meet all requirements in tube processing. transfluid Maschinenbau GmbH – Germany Fax: +49 29 7297 1511 Email: info@transfluid.de Website: www.tube-processing-machines.com

The technology shows its advantages in areas where powerful drives are required, as well as with several hydraulic cylinders of different sizes and at different speeds. This applies especially for bending processes and axial forming machines. The hybrid drives are also smaller and quieter in operation, and the heating in the process is minimised.

WHEN developing new technologies, compromises can often prevent the best solution. In tube processing this applies especially to the selection of the drive system for bending and forming machines or manufacturing cells. Electric drives are energy efficient, highly accurate and largely independent of external influences. Hydraulic drives have power density and robustness. No system can cover both as standard. Engineers at transfluid Maschinenbau GmbH have developed a system that combines some advantages of both systems and excludes the disadvantages. The hybrid drives are effectively matched to the requirements of the corresponding machines. Hydraulic units of the new system are equipped with constant pumps and are driven by a powerful servo motor. Almost the entire control of the system takes place via the power or rotation speed of the motor, and energy efficiency is generally improved by 15 to 20 per cent, since the power is always given in accordance with the consumer.

transfluid’s hybrid drive system provides precision, energy efficiency and performance

39

www.read-tpt.com

M ay 2013