TPT November 2010

THE ART OF WELDING

Customised sawing and milling equipment MASCHINENFABRIK Liezen und Gießerei GmbH (MFL) provides customised sawing and milling equipment for tube manufacturers all over the world. The company’s plate and stripe edge milling machines are used for the welding seam preparation of ERW and spiral pipes, containers and rail car construction. Due to a number of enquiries from large-pipe manufacturers MFL decided to develop the RFA 24/56 welding seam processing machine, which mills the inner and outer welding seam of large- diameter pipes over a length of 400mm. This process offers a number of advantages compared to the manual grinding process. The greatest advantage is that the milling process provides a better quality of welding seam – an important criterion for the delivery of large diameter tubes to Gazprom and other major customers. The complete process is fully automatic. The company’s cold circular sawing machines are used for cutting stainless steel, high and low alloyed steel, structural steel and non-ferrous metals in the form of billets, tubes, profiles and plates. The machines are equipped with carbide tipped saw blades that ensure high performance and a long service life. The cutting machines are classified into single cut sawing machines and layer sawing machines. The single cut sawing machines are able to cut billets and single tubes with a diameter from 30 to 800mm. The layer sawing machines are used for cutting of tubes, I- and U-beams, sheet pilings and angles. The largest layer sawing machine is equipped with a saw blade diameter of 2,200mm and has a layer width of 1.5m. Smaller layer sawing machines are available, starting with a layer width of 650mm. One new invention from MFL is a saw blade with exchangeable carbide tips. The clamped carbide tips are the special feature of this novel saw blade. Common saw blades have the carbides brazed at the tooth. The carbides of the MFL saw blades are clamped into the gap between the main body and the tooth. The use of easily exchanged carbide tips removes the need for investment in expensive grinding centres, and less basic equipment is required because of the elimination of long transport times for regrinding of saw blades. Maschinenfabrik Liezen und Gießerei GmbH – Germany

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N ovember 2010

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