SAVING OF MATERIAL IN THE PRODUCTION OF STEEL SECTIONS
A significant proportion of hull steel-weight lines in the steel sections used, and the saving of material by good component design and by minimising scrap in its fabrication is therefore important. The Author, of the VEB Ingenieurburo Schiffbau (the shipbuilding consultants' bureau at Rostock), discusses, with special reference to the saving of material, the choice of the type of sections to be used, and describes some methods employed in East German shipyards for producing them. The article is mainly concerned with built-up T-sections and "rationalised" methods for their fabrication from the flame-cutting of the strips of plate material for the webs and flanges to the bending of the built-up sections. Comparisons are made between bulb sections and built-up T-sections from the point of view of section modulus for a given weight of material. The T-section, proportioned for weight-saving, is superior in this respect, and even allowing for its fabrication costs, it is cheaper than the bulb section in the examples quoted in the article. A range of lightweight built up T-sections has been developed in East Germany. The cutting of bulb sections, and of the plate-material strips for T-sections, to the required lengths is discussed from the material-saving viewpoint. The use of flash welding for T-section butts can improve material utilisation by about 5%; in the submerged-arc strip-electrode welding of the web-to-flange fillets, speeds of about 1 metre/min. are reached. Bending of T-sections (of lightweight proportions and therefore with thin webs) is discussed in some detail, together with the machines used. These are the UFB 400/1 frame-bending machine and a smaller machine, the 250-tonne UFB 250. The amount of material that has to be discarded at the ends of the bent sections is comparatively small with both machines. Order from: BSRA as No. 48,187.
VEB AutobahnbaukombinatTemplinestrasse 19
- Bartuschka, K
- Publication Date: 1977-12
- Features: References;
- Pagination: 4 p.
- Volume: 9
- TRT Terms: Bending; Butt welds; Economics; Flame cutting; Frames; Manufactures; Manufacturing; Materials selection; Production; Shipbuilding; Steel; Submerged arc welding
- Old TRIS Terms: Flash welding; Frame bending; Steel production economics; Steel selection
- Subject Areas: Economics; Marine Transportation;
- Accession Number: 00177393
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: Jul 19 1978 12:00AM