EoW September 2009

technology news

Welding flexibility for grating panels A new model in the GRG series has recently entered the CEMSA resistance welding machine family. GRG-JR-1000 is a line for the production of heavy grating panels, welding longitudinal steel bearing bars of 6,000mm length, with steel cross wires of 4mm to 6mm diameter and 1,000mm length.

The welding process is automatic; loading of the longitudinal bars and cross wires and wire cropping is manual. The machine is available in several versions to suit working speed, power availability from the factory network and the required results. The installed power is therefore linked to the working solutions, ranging from 300KW, in case of electrical cascade, up to 1,500KW in case of one-stroke welding (one wire at a time). With the solution in electrical cascade, a multi-head scheme can achieve productivity of 5-6 seconds for a cross wire of 1,000mm length and 5mm diameter (included one-step indexing). The CN towing system allows choosing the distances of the cross wires whilst for different pitch of the longitudinal bars, changing the tooling (if not multiple) is necessary. This system is chiefly targeted at medium and small companies, but big companies can also benefit from the flexible system of production. Tenova Strip Processing has received the acceptance certificate for the new magnesium coating line installed at the ArcelorMittal Valcovny Plechu plant in Frydek-Mistek (Czech Republic). The Tenova contract covered the engineering, equipment, erection super- vision and commissioning of a complete cleaning and MgO coating line with strip thickness 0, 18-0, 35mm and widths of up to 1,050mm. The new line is part of an advanced production process for grain-oriented silicon steel, a material mainly used in the electric transformers industry. Tenova Group – Italy Website : www.tenovagroup.com New silicon steel line CEMSA SpA – Italy Fax : +39 02 253 3307 Email : info@cemsa.it Website : www.cemsa.it

CEMSA’s GRG-JR-1000 welding machine ▲ ▲

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EuroWire – September 2009