The discovery of explosive compound was first made in 1944, when American L.R. Carl (Carl) accidentally found two thin brass discs with a diameter of 1 inch and a thickness of 0.035 inches in an explosive explosion test, which were welded together due to the sudden impact of the explosion. In fact, in The second World War, when repairing wounded tanks, it was often found that shrapnel from tilting into the tank would weld firmly to the tank armor, but during the war people did not have time to study this phenomenon.
In 1947, M.A. Lavrentev, a famous scientist at the Siberian Branch of the Soviet Academy of Sciences, also discovered this phenomenon, formally called "explosive welding" in his paper, while studying the piercing of armor by shaped bullets.
In the field of welding, the welding of different materials is very difficult, such as steel and aluminum, steel and copper welding. And the welding of large welding depth is also very difficult, if you want to use conventional welding, protective welding and other welding methods to weld two pieces of 40mm thick wide plate into a wide plate of 80mm thick, it is estimated that no one will do it. The explosion, however, perfectly solves both problems at once.
From people observed bomb fragments can firmly glue phenomenon on the impact of metal target board, to the sixties and seventies of the 20th century developed into a kind of advanced metal processing technology, has about 100 explored time, only the last 50 years is fast developing period of explosive welding technology, the explosion welding an advanced tool for metal products, It is widely used in industrial sectors all over the world. The most famous example of explosive welding is the titanium steel explosive welding joint on the Apollo spacecraft.
Metal composite materials have excellent corrosion resistance, high mechanical strength and low cost, etc., and have been widely used in anti-corrosion, wear resistance, buffer, electrolysis and other engineering fields for many years. Especially salt chemical industry, coal chemical industry, petrochemical industry, water conservancy metallurgy, power generation system, industrial refrigeration, shipbuilding, electrolytic aluminum, military armor, aerospace and other industries have been deeply applied to the development.
Explosive compound this new process, new technology in a short period of time to obtain rapid development and wide application, the main reason is that it has the following four advantages:
(1) It can make the metal combination with extremely different properties such as melting point, strength and thermal expansion coefficient realize recombination. Such as aluminum - steel, titanium - steel and so on. At present, more than 300 kinds of composite materials have been realized, which is unmatched by other methods.
(2) Excellent material properties; The general design principle of composite plate is that the base material meets the mechanical properties of the structure and the composite plate meets the corrosion resistance or wear resistance. Therefore, compared with single metal plate, composite plate makes full use of the best performance of substrate and cladding plate, not only has the required high strength, but also has excellent corrosion resistance, wear resistance and other performance high production efficiency.
(3) High production efficiency/high binding strength. Explosive composite in a very short time, and can carry out a large area of welding, the area can reach more than 20 square meters, in the composite interface, dissimilar metals through metal bonds to achieve the combination of atoms, generally not less than the lowest strength of the matrix of composite materials.
(4) Good economy. The composite panel produced by explosive welding technology has not only the corrosion resistance of cladding but also the strength and toughness of base layer, which can save precious metal resources and reduce the cost.