What Is Marine Grade Aluminum 5083

5083 aluminium plate is a non-heat-treated strengthened aluminum alloy that uses work hardening and micro-alloying to improve its comprehensive properties. It does not suffer from low-temperature cold brittleness and still maintains excellent mechanical properties under low-temperature conditions. It is a well known marine grade aluminum alloy.

5083 aluminum alloy has high tensile strength, high elongation, easy surface treatment, good bending processability, light weight, strong corrosion resistance, etc., and is widely used in LNG tanks, such as IHI SPB tanks, MOSS tanks and lNG tank. Friction Stir Welding (FSW) is a new aluminum alloy LNG tank and storage tank manufacturing technology in addition to traditional arc welding and melt inert-gas welding (MIG).

Basic principles and typical welding processes of FSW

The working principle of FSW is that first two workpieces are butted at the edges, and then during the rotation process, a welding tool with a probe on the tip is pressed against the boundary of the workpieces. Frictional heat softens the workpiece material, and the tool tip is tilted toward the workpiece boundary to mix the materials without melting. There is a thread on the probe that promotes stirring. When rotated, the tool moves along the boundary to expand the connection area.

A typical FSW welding process includes: 1) rotating the tool, pressing it to the joint area and inserting it into the area; 2) frictional heat softens the material, and the friction causes the material to stir;3) While maintaining stirring, move the tool along the butt line to weld the workpiece; 4) Remove the tool to complete the welding process.

FSW features

FSW uses solid-state plastic flow for welding, which does not cause solidification shrinkage that is common in fusion welding. The heat input to the workpiece is low, the heat shrinkage generated is also very small, and there is almost no deformation after connection.

In addition, compared with arc welding, FSW has a high degree of automation, low labor costs, consumes relatively little electricity and does not produce harmful rays or smoke (metal vapor) produced by arc welding, which can maintain a good working environment, reduce the burden on workers and save energy, etc. With its advantages, it is being widely used in the welding of aluminum alloy plates in LNG tanks/storage tanks.

Application of FSW in LNG tank construction

In 2010, IHI successfully applied FSW technology to the welding of IHI-SPB LNG tank aluminum alloy plates for the first time. Aluminum alloys have been used to build cargo tanks of LNG carriers for decades. In September 1981, Japan's first LNG carrier "Golar Spirir" was completed and delivered at Kawasaki Heavy Industries' factory. At present, aluminum alloy has become one of the most important construction materials for IHI SPB cabins and MOSS cabins.

In addition to the marine grade aluminium 5083, Haomei Aluminum also has marine 5086 sheet, 5052, 5059, 5383,etc., with DNV certification. Welcome to leave message below to inquire what you need.

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