TPT March 2012

T echnology N ews

Longitudinal welding for tube ROSENDAHL supplies complete tube mill systems for the production of welded metal tubes. These lines are capable of producing tubes and pipes with a diameter from 6 to 1,024mm and wall thicknesses from 0.1 to 20mm. All the lines are individually customised, focusing on the needs of the final product application: solar tubes and hoses; heat exchanger tubes; hygienic and process tubes and pipes; and automotive applications. regard to economic efficiency, Rosendahl provides solutions with TIG, plasma, laser and HF welding technologies. Rosendahl evaluates the potential influences on the metallurgical structure, hardness value of the welding seam, corrosion resistance of the material, shape and formability of the welding seam, ability for continuous operation and welding speed.

and plasma as well as laser welding is possible, even with the use of filler material for high wall thickness levels. Rosendahl tube mill systems are equipped in such a way that an upgrade to another welding principle is possible without any major effort, even after start up phase according to enlargement of capacity or change in products. To enlarge the maximum speed range of laser welding, which is limited with keyhole welding in the range of 20m/min, for wall thickness below 0.7mm, heat conductive laser welding is used. This offers the advantages of high speed welding up to 60m/min; 100 per cent repeatability and process control for wall thickness down to 0.1mm; and non-stop production for continuous operation. Rosendahl Maschinen GmbH – Austria Fax: +43 3113 5100 59 Email: office@rosendahlaustria.com Website: www.rosendahlaustria.com

The company offers a consulting service that is necessary for the tube product and process evaluation, the preparation of tube mill investments and upgrades. This includes metallurgical analysis of tubes and tubular products, characterisation of metal formability and corrosion performance and the testing of weld ability. For the production trails of smooth and corrugated tubes, laboratory lines are on duty in the Rosendahl R&D centre. Rosendahl Hybrid welding systems allow the use of different welding methods, system by system or simultaneously in one tube mill. The combination of Polyarc TIG

Rosendahl tube mills process materials of different grades of ferritic and austenitic stainless steels, nickel basic alloys, titanium, aluminium, and copper and its alloys. In the course of the conception of turnkey solutions, which covers the process steps tape preparation, tape forming, tube welding, tube corrugation, welding seam cold working, tube calibration and tube heat treatment, the selection of the welding procedure is an essential step. Different materials and applications require different welding technologies. With

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M arch 2012