Exactly 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 refers to the explosion of the metal composite plate. An explosive welding composite plate is a type of composite material plate manufactured by using explosive forming technology, and its manufacturing process involves multiple steps such as explosive forming, metal composite, and surface treatment.
Metal explosive welding technology is really a composite material processing technology that utilizes the large energy generated from the instantaneous generation of explosives to instantly composite two or more types of similar or dissimilar materials together, and this technology can weld alloys with various properties, particularly those which are not dissolved, into one piece.
In comparison 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 of 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 pieces of 1-inch diameter, thickness of .035 inches of thin brass discs, because of the sudden impact of the explosion and was welded together. Actually, in World War II, individuals the repair of wounded tanks, but also often discovered that tilted impact towards the tank on the shrapnel is going to be firmly welded towards the tank armor phenomenon, just throughout the war individuals have no time to analyze it.
In 1947, the Siberian branch of the Soviet Academy of Sciences, the famous scientists M.A. Lavrentsev in the study of polymer bombs to penetrate the armor also found this phenomenon, within his dissertation formally known as “explosive welding”.
In the field of welding, the welding of various materials, such as steel and aluminum, steel and copper, is technically very hard. And large welding depth of welding can also be very hard, if you wish to use conventional welding, shielding welding as well as other welding methods is going to be two 40mm thick wide plate welded right into a 80mm thick wide plate, it really is estimated that no one will do. However, the explosive welding is perfect to resolve the two problems simultaneously.
Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that mixes one or more materials right into a single piece using explosives because 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 of 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 of the jet, the jet eliminates the top of the contamination layer, so that the welded metal flat plate with a clean surface in contact with each other 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 creation of explosive welding composite plates. Within the explosion forming process, explosives in certain conditions instantly detonated, the resulting high-pressure gas is going to be pushed towards the opposite side of the metal plate mold, so that the metal plate instantly to get the desired shape and size. This forming technique is characterized by high precision and efficiency.
2. Metal composite
Within the explosion molding, the necessity for metal composite. This step is usually used in explosion welding or explosion crimping as well as other methods, two or more metal plates through the explosion energy combined together to form a composite material. During the metal composite process, a metallurgical reaction occurs between different metals, forming a strong metallurgical bond.
3.Surface treatment
Surface treatment is usually needed to improve the surface quality and corrosion resistance of the explosive welding plate. Widely used surface treatment methods include spraying, plating, chemical plating and so on. These methods can boost the wear resistance, corrosion resistance and aesthetics of the composite plate.
Explosive welding composite plate production process, although simple, flexible production, however the technical requirements are high, hard to accurately control, the parent material properties (toughness, impact properties, etc.), explosives properties (bursting speed stability, safety, etc.), the initial 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.) of the choice and system coordination of the composite plate of 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 at the bonding interface, and severe plastic deformation with work hardening happens in the bonding zone. The bonding surface features a wavy structure, which is beneficial to the improvement of bonding strength and tensile strength.
Explosive welding plate performance
Explosive welding explosive welding plate will not change the chemical composition and physical state of the original material, based on the actual needs of the composite material to become 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 of the mixture of materials than the mixture of composite materials is very high strength, usually greater than the lower side of the mixture of materials, which is unattainable by other technologies. The composite material will not delaminate or crack during subsequent heat treatment, leveling, cutting, rolling, spinning as well as other production.
For room temperature and 550 ? heat treatment of carbon steel surface layer (near the interface layer) has serious deformation brought on by fibrous tissue and many fine particles, the center of the organization of ferrite plus pearlite; stainless steel interface for your second phase of point-like organization, the center of the needle-like organization. But by 650 ? treatment of carbon steel samples near the interface area of small particles of the organization disappeared (that could occur decarburization), the grain becomes coarse, the center of the organization continues to be ferrite plus pearlite, but could not be observed in the business of 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 benefits of the material right into a whole, giving full play to the use of different metal materials, and greatly save rare and rare materials, and the use of different metal materials. The use 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 region to develop supplies of low-carbon steel and iron, especially because the Jan. 31 reporting deadline for your European Union’s Carbon Boundary Adjustment Mechanism (CBAM) draws nearer, market participants said.
The situation is further complicated by the fact that other Western countries, namely the U.S., want to introduce similar policies.
A Singaporean trader said, “Asian steel producers have not slowed down production and want to increase output, so we expect capacity additions to outpace demand growth, particularly in the post-epidemic recovery period.” . “…… Products have to go somewhere. Producers can export to Europe, but this means they need to offer low-carbon products at competitive prices.”
Asia’s way to decarbonization has already seen a number of breakthroughs, particularly as policymakers have committed to various climate targets and dealt with public and private stakeholders to develop low-carbon technologies.
These investments have enabled steelmakers to explore 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, which has a lower carbon intensity when compared with blast furnaces.
Paolo Frediani, senior analyst at Fastmarkets, said the market is reacting towards 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 essentially supported by the fact that more and more end-users are trying to reduce their overall carbon footprint,” says Frediani. “While this drive is stronger in certain regions than others, it really is becoming a global phenomenon.”
Explosive composite explosion welding advantages
Explosive composite this new process, new technology inside a short time to acquire rapid development and wide application, the main reason is it has got the following four advantages:
(1) A variety of composite materials can be combined it can make the melting point, strength, coefficient of thermal expansion as well as other performance differences are incredibly disparate metal combinations to achieve composite. Like aluminum – steel, titanium – steel. At present has realized the composite material combination of more than 300 kinds, which is incomparable to other methods.
(2) Excellent material properties
Composite plate of the general design principle would be to satisfy the mechanical properties of the structure of the base material, compound plate to satisfy the corrosion or wear resistance as well as other properties. Therefore, compared with a single metal plate, the composite plate makes full utilisation of the best performance of the substrate, as well as the compound plate not only has got the required high strength but also has excellent corrosion resistance, wear resistance, as well as other properties of high production efficiency.
(3) High production efficiency/high bond strength.
Explosive composite in a really short time, and may be welded over a large area, a place as high as 20 square meters or more, in the composite interface, dissimilar metals through the metal bond to achieve inter-atomic bonding is generally not under the a minimum of the effectiveness of the composite material constituting the respective parent body.
(4) Good economy
The use of explosion welding technology to create composite plate products have both corrosion resistance of the compound layer as well as 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.
Use of explosive welding plate
Composite materials produced by the explosive welding method has been commonly used in petroleum, chemical, shipbuilding, electronics, electric power, metallurgy, machinery, aerospace, atomic energy as well as other industrial fields. The composite plate is carbon steel as a substrate, single-sided or multi-faceted with precious metals as a double layer of high-efficiency energy-saving new composite materials, composite by explosion welding of special processing technology, both using the corrosion resistance of precious metals, wear resistance, but also with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently commonly used in the petrochemical industry, metallurgy, salt production and alkali production, the water industry, Nuclear industry.
Shipbuilding
In shipbuilding, explosive welding plates may 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 of the ship.
Aerospace
Within the aerospace field, explosive welding composite plates may 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
Within the construction industry, explosive welding composite plates may 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 may 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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