The construction of a ship is a technical and very complex process that requires coordination of numerous workers under the control of the owner or principal contractor. This construction may have civil or military nature. Turning his head toward the past, It can be seen that metals began used in old ships, in order to shield them. Anyway, only they used to protect exterior wood construction. It was not until the Industrial Revolution, with the development of the steam engine and knowledge on steel, when steel became used as structural material. At that time the technique of clinching emerged, for attachment of the various pieces of steel. However, also he continued building wooden ships.
A mid-nineteenth century the mixed construction began, together using steel and wood, which allowed a substantial increase in vessel size. Thus it appeared the model clíper, slender, with a narrow and prominent bow, which he replaced the massive prows of the past. The first iron vessels appeared in 1790 and the first of welded steel 1880. Most iron resistance and the ability to easily assemble, He moved to the wood of the privileged position held in shipbuilding.
In the twentieth century they saw dramatic changes in how to build ships. welding was introduced in shipbuilding and modular construction system was established. Thus the traditional works of the stands were abandoned, and it passed just ride it blocks those that were previously manufactured and armed advance in the workshops. With this construction system constructive strategy was modified to optimize resources, shortening deadlines and reducing costs.
The workshops were responsible for producing bank facilities elements in the ship's hull and take off bounds, where arming. Produced pieces like the floors, frames, bulkheads, lengths, stringers or the shell plates. And for that used steel plates mecanizaban by bending or flattening cylinders, shears, riveters, etc.
The basic component that was used in shipbuilding was the steel plate. The plates were cut, They formed and worked in the manner required to give the configuration defined in the design. Usually, the plates were cut with automatic flame cutting equipment, and subsequently they welded. Finally the plates were sent to workshops building, where they were assembled to form other units.
If now, leaping, We moved to the current situation, of the last buildings of the Navy can have the following. In the case of the LHD Juan Carlos I (JCI), the materials used were manufactured and tested in accordance with the procedures specified in the Rules of the Classification Society Lloyd's Register. In general, Normal naval steel was used (elastic limit 235 MPa). In certain areas, as ro-ro decks and flight deck, steel was used high elastic limit the type H-36 (elastic limit 355 MPa) in order to reduce the weight of the structure. It was also used H-36 with the same primary elements above purpose in high light and high stress. JCI steels meet the characteristics specified in the rules of Lloyd's Register of Shipping for merchant ships, Part 2, Chapter 3. Overall grade "A" was used, except for those parts where the rules of Classification Society demanded a different. As tire iron reinforcements were mainly used bulbous and less flat tires and profiles I-T. Primary elements such as web frames, baos, stringers and profiles lengths were primarily type T. Other materials such as aluminum alloys prior approval of the authorities of the Navy were used. The Maritime Action Ship (BAM) It has been built in steel AH-36, can other materials used superior performance there where weight requirements or require structural. Steel was also used in the case of AH-36 F100 Fragatas.
Well that's all for this week, and for this season. For more information about this topic you can download my article entitled General Review of Marina “EVOLUTION OF NAVAL STEEL FROM THE TECHNIQUE TO RIVETING AH-36 “, published in May this year.
Or online consultation by clicking you here.
Finally I wish everyone happy summer. See you in September!