What is Explosive Welding Plates?
Aluminium Clad Steel Sheet, that is, the metal composite plate produced by the explosive welding method (explosion welding method), explosive welding plate generally means the explosion from the metal composite plate. An explosive welding composite plate is a kind of composite material plate manufactured by using explosive forming technology, and its manufacturing process involves multiple steps like explosive forming, metal composite, and surface treatment.
Metal explosive welding technology is a composite material processing technology that utilizes the large energy generated from the instantaneous generation of explosives to instantly composite 2 or more types of similar or dissimilar materials together, which technology can weld metals with different properties, particularly those that are not dissolved, into one piece.
Compared with the direct rolling composite method:
(1) loading speed, that is, the loading process is instantaneous ;
(2) Applied to the workpiece high-pressure pulse load, loading stress is a lot greater than the yield strength from the metal material;
(3) The bonding area shows wave-like metallurgical bonding characteristics;
Explosive welding composite plate history
Explosive composite discovery is definitely the earliest in 1944, the American L.R. Karl (Carl) inside a dynamite explosion test, accidentally found two bits of 1-inch diameter, thickness of .035 inches of thin brass discs, due to the sudden impact from the explosion and was welded together. In fact, in World War II, people in the repair of wounded tanks, but also often discovered that tilted impact to the tank around the shrapnel will be firmly welded to the tank armor phenomenon, just throughout the war individuals have virtually no time to study it.
In 1947, the Siberian branch from the Soviet Academy of Sciences, the famous scientists M.A. Lavrentsev in study regarding polymer bombs to penetrate the armor also found this phenomenon, in his dissertation formally known as “explosive welding”.
In the area of welding, the welding of different materials, like steel and aluminum, steel and copper, is technically very difficult. And huge welding depth of welding can also be very difficult, if you wish to use conventional welding, shielding welding and other welding methods will be two 40mm thick wide plate welded into a 80mm thick wide plate, it is estimated that no one can do. However, the explosive welding is ideal to solve the two problems at the same time.
Explosive welding composite plate principle production method
Explosive welding is a composite plate manufacturing method that combines one or even more materials into a single piece using explosives as the energy source. After the explosion of explosives, the blast products form a higher-pressure pulse load, directly acting on the compound plate, promoting the top-speed movement from the compound plate, in the collision reason for the compound plate as well as the substrate tilt collision, combined with violent plastic deformation as well as the formation from the jet, the jet takes away the surface of the contamination layer, so the welded metal flat plate with a clean surface in contact with one another at high temperatures and pressures, the two kinds of plate will realize the strong metallurgical bonding.
Explosive welding composite plate-specific production methods:
1. Explosion molding
Explosion molding is the initial step in the manufacture of explosive welding composite plates. In the explosion forming process, explosives in certain conditions instantly detonated, the resulting high-pressure gas will be pushed to the other side from the metal plate mold, so the metal plate instantly to get the desired size and shape. This forming method is characterized by high precision and efficiency.
2. Metal composite
In the explosion molding, the necessity for metal composite. This task is usually utilized in explosion welding or explosion crimping and other methods, 2 or more metal plates through the explosion energy combined together to form a composite material. Throughout the metal composite process, a metallurgical reaction occurs between different metals, forming a powerful metallurgical bond.
3.Surface treatment
Surface treatment is usually required to improve the surface quality and corrosion resistance from the explosive welding plate. Commonly used surface treatment methods include spraying, plating, chemical plating and so on. These techniques can boost the wear resistance, corrosion resistance and aesthetics from the composite plate.
Explosive welding composite plate production process, although simple, flexible production, but the technical requirements are high, difficult to accurately control, the parent material properties (toughness, impact properties, etc.), explosives properties (bursting speed stability, safety, etc.), the first parameters (the amount of explosives per unit area, the base compound plate spacing, etc.) as well as the dynamic parameters (collision angle, the compound plate collision speed, etc.) from the choice and system coordination from the composite plate from the finished product yield and quality features a direct impact.
The composite interface consists of direct bonding area, melting layer and vortex. Atomic diffusion exists in the bonding interface, and severe plastic deformation with work hardening happens in the bonding zone. The bonding surface features a wavy structure, that is beneficial to the improvement of bonding strength and tensile strength.
Explosive welding plate performance
Explosive welding explosive welding plate is not going to alter the chemical composition and physical state from the original material, based on the actual needs from the composite material to be individually processed in to the required optimal state.
Explosive welding plate application performance is very good, can withstand cold, hot processing without changing the thickness from the mixture of materials than the mixture of composite materials is very high strength, usually greater than the low side from the mixture of materials, that is unattainable by other technologies. The composite material is not going to delaminate or crack during subsequent heat treatment, leveling, cutting, rolling, spinning and other production.
For room temperature and 550 ? heat treatment of carbon steel surface layer (close to the interface layer) has serious deformation brought on by fibrous tissue and many fine particles, the center from the organization of ferrite plus pearlite; stainless steel interface for your second phase of point-like organization, the center from the needle-like organization. But by 650 ? treatment of carbon steel samples close to the interface area of small particles from the organization disappeared (that may occur decarburization), the grain becomes coarse, the center from the organization is still ferrite plus pearlite, but can not observed in the business from the slip line produced by deformation; and in the stainless steel interface there are a large number of small black particles, titanium steel composite plate may be the decarburization of chromium carbide particles formed after the advantages of the fabric into a whole, giving full play to the usage of different metal materials, and greatly save rare and rare materials, and the usage of different metal materials. The usage of performance greatly saves rare metal materials, thus lowering the production price of equipment.
Weak demand and oversupply in Asia have pushed steelmakers in the area to develop supplies of low-carbon steel and iron, especially as the Jan. 31 reporting deadline for your European Union’s Carbon Boundary Adjustment Mechanism (CBAM) draws nearer, market participants said.
The problem is further complicated because other Western countries, namely the U.S., are looking to introduce similar policies.
A Singaporean trader said, “Asian steel producers have not slowed down production and are looking to increase output, so we expect capacity additions to outpace demand growth, particularly in the post-epidemic recovery period.” . “…… Products need to go somewhere. Producers can export to Europe, but that means they have to offer low-carbon products at competitive prices.”
Asia’s path to decarbonization has seen a number of breakthroughs, particularly as policymakers have focused on various climate targets and worked with public and private stakeholders to build up low-carbon technologies.
These investments have enabled steelmakers to discover commercially viable technologies and reliable sources of clean energy, namely direct decrease in iron from scrap or gas, or shifting to electric arc furnace steelmaking, that features a lower carbon intensity compared to blast furnaces.
Paolo Frediani, senior analyst at Fastmarkets, said the market is reacting to the steadily growing demand for green steel, given the amount of pipeline investment.
“CBAM will certainly provide a major boost [in creating a green steel supply chain], but despite the advanced regulation of steel emissions in Europe, the green steel premium is largely supported because more and more end-users are attempting to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in certain regions than others, it is being a global phenomenon.”
Explosive composite explosion welding advantages
Explosive composite this new process, new technology inside a short period of time to obtain rapid development and wide application, the primary reason is that it has got the following four advantages:
(1) A variety of composite materials could be combined it will make the melting point, strength, coefficient of thermal expansion and other performance differences are extremely disparate metal combinations to achieve composite. Like aluminum – steel, titanium – steel. At present has realized the composite material combination of over 300 kinds, that is incomparable with other methods.
(2) Excellent material properties
Composite plate from the general design principle would be to meet the mechanical properties from the structure from the base material, compound plate to meet the corrosion or wear resistance and other properties. Therefore, in comparison with just one metal plate, the composite plate makes full utilisation of the best performance from the substrate, as well as the compound plate not just has got the required high strength but also has excellent corrosion resistance, wear resistance, and other properties of high production efficiency.
(3) High production efficiency/high bond strength.
Explosive composite in a really short period of time, and can be welded over a large area, a place of up to 20 square meters or even more, in the composite interface, dissimilar metals through the metal bond to achieve inter-atomic bonding is normally not less than the minimum of the effectiveness of the composite material constituting the respective parent body.
(4) Good economy
The usage of explosion welding technology to produce composite plate products have both the corrosion resistance from the compound layer and other functional characteristics and both the effectiveness of the grass-roots level and plastic toughness indicators, it can save you precious metal resources, reduce costs.
Application of explosive welding plate
Composite materials produced by the explosive welding method continues to be widely used in petroleum, chemical, shipbuilding, electronics, electric power, metallurgy, machinery, aerospace, atomic energy and other industrial fields. The composite plate is carbon steel being a substrate, single-sided or multi-faceted with precious metals being a double layer of high-efficiency energy-saving new composite materials, composite by explosion welding of special processing technology, both with the corrosion resistance of precious metals, wear resistance, but also with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently widely used in the petrochemical industry, metallurgy, salt production and alkali production, the water industry, Nuclear industry.
Shipbuilding
In shipbuilding, explosive welding plates can be used to manufacture hull structures, decks, bulkheads, etc. Because of its high strength and good corrosion resistance, the explosive welding plate can effectively improve the durability and service life from the ship.
Aerospace
In the aerospace field, explosive welding composite plates can be used to manufacture airplane fuselage, wings, engine parts, etc. Because of its good thermal stability and strength, explosive welding composite plate can improve the performance and safety of aircraft.
Construction Industry
In the construction industry, explosive welding composite plates can be used to manufacture structural parts for bridges, high-rise buildings, highways, and so on. Because of its high strength and good corrosion resistance, explosive welding composite plate can improve the safety and service life of buildings.
Automobile manufacturing
In automobile manufacturing, explosive welding composite plates can be used to manufacture body structural parts, engine parts, and so on. Because of its lightweight, high strength, and good thermal stability, the explosive welding plate can improve the performance and safety of automobiles.
Explosive welding plate cladding of metals supplier
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