Aluminum alloy features strong plasticity, high strength, and light weight, and has been well applied in shipbuilding. 5xxx aluminum alloys like aluminium 5383 5083 are often used for building sailboat, yachts and fishing boat. They mainly contain elements such as Al, Zn, and Mg. The similarity of these elements is that they have low melting points and are easy to evaporate under high temperature, which will also reduce the risk of aluminum alloy joints.
In the process of aluminum alloy ship construction, how to choose the appropriate welding process for operation is also the key point that the operators need to focus on. By sorting out the characteristics of the aluminum alloy ship construction process and clarifying the issues that should be focused on during the process, it will play a positive role in improving the quality of aluminum alloy ship construction and prolonging the service life of the ship.
In the welding process of aluminum alloy, because the melting point of the material is low, only 660 ° C, so in the welding process, a concentrated welding method should be selected to avoid melting of the non-welding parts under high temperature, which will affect the final welding quality. Moreover, the expansion coefficient of the aluminum alloys is relatively large, twice that of the steel material, which also means that the volume of the aluminum alloy will decrease after welding.
Based on past welding experience, it can be known that its volume reduction is greater than about 5%, and when facing aluminum alloy components with large welds, it is easy to appear structural cracks under the action of the expansion coefficient, which affects the forming of the structure quality.
Among all welding technologies, electrode arc welding technology has been around for the longest time, and has application advantages such as simple operation process and low construction cost. In the practical application of this technology, its function principle is to fix the aluminum alloy material to be welded.
After the fixing operation is completed, the surface of the aluminum alloy is cleaned, and the welding device is connected at the same time, and the electrode is fixed at the predetermined position, according to the established order. Because this method is relatively traditional, it is easy to cause slag inclusion or welding porosity in the weld, and it is rarely used in aluminum alloy ship construction at present.
Among the new welding technologies emerging at present, laser welding technology is a welding technology that uses laser as a heating source. In the actual application process of this technology, its function principle is to pre-splice the aluminum alloy structure to be welded according to the established requirements, and after confirming that there is no problem, use laser welding equipment to align the weld seam.
After starting the equipment, the device will release laser radiation to the outside. The thermal radiation generated by the laser is very large. This thermal radiation can reach the conditions for melting aluminum alloy sheet like 5083 aluminum sheet for sale. During the melting process, the steel structure will be refused together to form a whole. This method is easy to operate and has high welding quality, and it is currently widely used in aluminum alloy ships.
Original Source:https://www.marinealu.com/a/the-welding-of-5383-5083-aluminum-sheet-for-sailboat.html
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