aluminum-steel transition joints

Jul 07, 2023

The aluminum-steel transition joints is generally made of composite plate by explosion welding method, which is processed into strip, plate, circle or other shape by cold processing methods such as saw, planing, milling and water cutting.
As the aluminum-steel transition joints is composed of three different metal materials: aluminum alloy, aluminum and steel, the solubility between aluminum and steel is very low, and a variety of metal embrittlement phases will be formed when they fuse with each other. Under the action of welding stress, these intermetallic phases are easy to cause weld crack.Therefore, aluminum alloy as the cladding, aluminum as the intermediate layer, the hull structure steel as the base.

Generally used in high-speed ships on the construction of aluminum alloy (such as 5083,6082, etc.) have a ficant corrosion resistance, but if the ship is not built in accordance with the process requirements, after several years of use of the ship will still occur corrosion.
1. Spot corrosion.Aluminum pits in the ocean air and forms a very shallow gritty white powder on the entire surface.
2. Electrochemical corrosion.Metals with different electrode potentials in the electrolyte, the more negative metal will accelerate corrosion, while the more positive metal will be protected.