In the traditional earlier shipbuilding industry, the aluminum / steel transition connection in civil ships and small ships was mainly made by riveting and bolt pressing. In order to "reduce the weight, reduce the center of gravity, improve the stability and speed", around the 1980s, the superstructure of ships gradually began to use a large number of aluminum alloy materials for construction. The traditional rivet riveting and bolt crimping aluminum / steel transition connection methods can not meet the requirements of this kind of new ship construction.
Subsequently, aluminum steel transition joints, which were made by explosive welding in the early stage, appeared abroad. Aluminum steel transition joints made by explosive welding can be divided into aluminum / steel combination, aluminum / aluminum / steel combination and aluminum / titanium / steel combination according to the combination of material types, and aluminum steel transition joints made by two-layer and three-layer composite according to the number of combination levels。
Using this kind of transition joint, the transition connection between aluminum and steel can be better realized by field welding methods (aluminum to aluminum welding, steel to steel welding). The advantage of using this connection method is to improve the "water tightness and corrosion resistance" of the aluminum / steel joint, improve the "structural strength", reduce the "construction time and construction difficulty". The aluminum steel transition joints made by explosive welding method can solve the aluminum / steel transition joint problem in the construction of civil ships and small ships, and its advantages are obvious.
Just like many new materials, they have gone through the development process from birth to improvement, and then to improvement. Similarly, the requirements for the comprehensive performance of the aluminum / steel transition joint manufactured by explosive welding, from the early aluminum / steel combination, aluminum / aluminum / steel combination, aluminum / titanium / steel combination, are constantly changing and improving with the continuous change of the use environment and requirements.
Early aluminum / steel, aluminum / aluminum / steel, aluminum / titanium / steel combination, aluminum / steel transition joint made by explosive welding, as far as its performance is concerned, through many years of use, manufacturing, research and development experience for comprehensive analysis, there are many problems in its performance and usability, such as safety risks, low welding temperature resistance, poor fatigue performance and so on.
