TPT May 2008

T ube & P ipe W elding: T rends & P rogress

Latest 250kW solid state welder with Mosfet inverter

Power grid tubes for tube and pipe welding

Richardson Electronics Ltd, USA, a leading supplier of power grid tubes for over 60 years, has a firm commitment to the tube and pipe welding industry. Richardson stocks an extensive inventory of power grid tubes ready for immediate delivery, from such leading manufacturers as Amperex , Eimac , Econco, National, Thales, and Toshiba. The company is skilled in identifying and supporting cost-effective solutions for customers in the RF and wireless communications, electron device, power conversion, medical imaging, and display systems markets. Richardson supplies a full range of components and services that include product manufacturing, systems integration, prototype design and manufacture, testing and logistics. Richardsons Electronics Ltd – USA Fax : +1 630 208 2550 Website : www.industrial.rell.com

Emmedi, part of Italy’s Saet Group, has launched a new solid state welder, with 250kW output power, based on a Mosfet inverter able to work up to 450kHz. The new welder is comprised of units including transformer, power supply, welding head, cooling system and control desk. The power supply is a three-phase full bridge thyristor rectifier. Proper filters are inserted in order to reduce the harmonic components that may effect the welding process. A system control board is included that communicates with the inverter through optical fibres. The inverter is a current fed type, composed of a suitable number of modules (each power rated to 25kW). The modules are connected in parallel, with an output oscillating circuit directly connected to the inverter. The necessary protections (hardware and software) have been implemented

both on the single module and on the whole system to limit component failures. The modular structure and a complete diagnosis system allow for 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). It also has the possibility to follow the change of frequency (with any working condition) due to load variation. The Saet Group provides full technical support, with a quick and cheap solution available in the form of remote teleservice. This allows the company’s technicians to operate directly on the welding unit without paying a visit. Emmedi Welding & Annealing Division (Saet Group) – Italy

Fax : +39 011 9974328 Email : info@emmedi.it Website : www.saetgroup.com

THINKING OF LIVING AND WORKING IN AUSTRALIA?

Orrcon Steel is an Australian market leader in the manufacture and distribution of steel tube and pipe with precision manufacturing operations near Adelaide, South Australia, precision and structural tube manufacturing operations in Brisbane, Queensland and a forming plant and API accredited large pipe and tube mill in Wollongong New South Wales. We have an Australia-wide sales and distribution network servicing our customers in the rapidly growing mining, infrastructure, water, oil and gas and manufacturing sectors, along with established fabrication and general market sectors. We are looking for talented people with solid engineering, production, tooling or technical experience in quality pipe and tube manufacturing and related support services. If you are thinking of moving to Australia your future may be with Orrcon. We have openings in various locations and functions across our operations and are interested in supporting prospective candidates with sponsorship to migrate to Australia. If you are interested please submit your resume detailing your skills and experience in the steel tube and pipe industry to: Susan Skee Human Resources recruitment.nsw@orrcon.com.au www.orrcon.com.au For our company profile visit

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M ay 2008

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