Aluminum alloys for ships can be divided into aluminum alloys for hull structures, aluminum alloys for outfitting, and aluminum alloys for welding. For a long period of time, marine grade aluminium for sale are mainly selected from Al-Mg series alloys and Al-Mg-Si series alloys. In recent years, the research on the medium-strength weldable Al-Zn-Mg series alloys has also increased, and some progress has been made. The strength and process performance of the medium-strength Al-Zn-Mg series alloys after heat treatment are superior to those of the Al-Mg series alloys. It is weldable and has certain corrosion resistance, which is very attractive to the shipbuilding industry. Among the outfitting aluminum alloys, anodized 6063–T5 alloy extruded profiles are mainly used for frame structures, and industrial pure aluminum and 3203 alloy plates in H14 and H24 states are mainly used for interior structures such as cabin walls。



Welding between aluminum alloy and hull steel
Aluminum alloy-steel transition joints are generally formed by explosive compounding of 3 different metal materials: 5083 aluminum alloy, 1060 aluminum (intermediate layer) and CCSB steel. In August 1992, the aluminum alloy superstructure and the steel structure were welded by explosive composite three-layer aluminum-steel composite connecting strips. A shipyard in my country successfully built the first ferry, and the cross-sectional area of ​​the ferry composite connecting strip was only foreign In the following 3 years, the use of this type of ferry boat can withstand the test of wind and wave loads.