Exactly what is Explosive Welding Plates?
Composite Plate, that is, the metal composite plate created by the explosive welding method (explosion welding method), explosive welding plate generally refers to 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 by the instantaneous generation of explosives to instantly composite two or more kinds of similar or dissimilar materials together, which technology can weld metals with various properties, especially 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 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) in a dynamite explosion test, accidentally found two pieces 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, individuals the repair of wounded tanks, but additionally often found that tilted impact to the tank around the shrapnel will be firmly welded to the tank armor phenomenon, just throughout the war people have no time to analyze 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, within his dissertation formally referred to as “explosive welding”.
In the field of welding, the welding of various 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 really is estimated that no one will do. However, the explosive welding is perfect to resolve the 2 problems simultaneously.
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. Following the explosion of explosives, the blast products form a high-pressure pulse load, directly working on the compound plate, promoting the top-speed movement from the compound plate, within the collision point of 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 eliminates the top of the contamination layer, so the welded metal flat plate with a clean surface in contact with one another at high temperatures and high pressures, the 2 kinds of plate will realize the strong metallurgical bonding.
Explosive welding composite plate-specific production methods:
1. Explosion molding
Explosion molding is the first step within the manufacture of explosive welding composite plates. In the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas will be pushed to the opposite side from the metal plate mold, so the metal plate in an instant to get the desired size and shape. This forming method is described as high precision and high efficiency.
2. Metal composite
In the explosion molding, the need for metal composite. This task is generally used in explosion welding or explosion crimping and other methods, two or more metal plates with 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 needed to enhance the surface quality and corrosion resistance from the explosive welding plate. Widely used surface treatment methods include spraying, plating, chemical plating and so forth. 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, however 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 initial parameters (the quantity 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 has a direct impact.
The composite interface includes 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 has a wavy structure, that is helpful 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 from the original material, according to the actual needs from the composite material to be individually processed into the required optimal state.
Explosive welding plate application performance is superb, can withstand cold, hot processing without changing the thickness from the mixture of materials than the mixture of composite materials is extremely high strength, usually greater than the lower side from the mixture of materials, that is unattainable by other technologies. The composite material will not delaminate or crack during subsequent heat treatment, leveling, cutting, rolling, spinning and other production.
For room temperature and 550 ? heat management of carbon steel surface layer (near the interface layer) has serious deformation caused by fibrous tissue and many fine particles, the heart from the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the heart from the needle-like organization. But by 650 ? management of carbon steel samples near the interface area of small particles from the organization disappeared (that could occur decarburization), the grain becomes coarse, the heart from the organization continues to be ferrite plus pearlite, but can not be observed in the business from the slip line created by deformation; as well as in the stainless steel interface there are a lot of small black particles, titanium steel composite plate could be the decarburization of chromium carbide particles formed after the advantages of the fabric 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 usage of performance greatly saves rare metal materials, thus reducing the production cost of equipment.
Weak demand and oversupply in Asia have pushed steelmakers in the region to build up supplies of low-carbon steel and iron, especially as the Jan. 31 reporting deadline for the European Union’s Carbon Boundary Adjustment Mechanism (CBAM) draws nearer, market participants said.
The situation is further complicated because 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 that means they need to offer low-carbon products at competitive prices.”
Asia’s path 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 discover commercially viable technologies and reliable causes of clean energy, namely direct decrease in iron from scrap or natural gas, or shifting to electric arc furnace steelmaking, that features a lower carbon intensity when compared with blast furnaces.
Paolo Frediani, senior analyst at Fastmarkets, said the market is reacting to the steadily growing demand for green steel, given the quantity of pipeline investment.
“CBAM will surely provide a major boost [in creating a green steel supply chain], but regardless of the advanced regulation of steel emissions in Europe, the green steel premium is largely supported because increasingly more end-users are trying to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in certain regions than others, it really is being a global phenomenon.”
Explosive composite explosion welding advantages
Explosive composite this new process, new technology in a short period of time to acquire rapid development and wide application, the main reason is it has the following four advantages:
(1) A number of composite materials can be combined it will make the melting point, strength, coefficient of thermal expansion and other performance differences are extremely disparate metal combinations to accomplish composite. Such as aluminum – steel, titanium – steel. Currently has realized the composite material combination of over 300 kinds, that is incomparable to other methods.
(2) Excellent material properties
Composite plate from the general design principle is to meet the mechanical properties from the structure from the base material, compound plate to satisfy the corrosion or wear resistance and other properties. Therefore, in comparison with just one metal plate, the composite plate makes full use of the best performance from the substrate, as well as the compound plate not only has the required high strength but additionally has excellent corrosion resistance, wear resistance, and other properties of high production efficiency.
(3) High production efficiency/high bond strength.
Explosive composite in a very short period of time, and can be welded spanning a large area, a place as high as 20 square meters or even more, within the composite interface, dissimilar metals with the metal bond to accomplish inter-atomic bonding is generally not less than the a 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.
Use of explosive welding plate
Composite materials created by the explosive welding method continues to be commonly used in petroleum, chemical, shipbuilding, electronics, electric power, metallurgy, machinery, aerospace, atomic energy and 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 with the corrosion resistance of precious metals, wear resistance, but additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently commonly used within 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 enhance the durability and repair 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 high strength, explosive welding composite plate can enhance 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 forth. Because of its high strength and good corrosion resistance, explosive welding composite plate can enhance the safety and repair life of buildings.
Automobile manufacturing
In automobile manufacturing, explosive welding composite plates can be used to manufacture body structural parts, engine parts, and so forth. Because of its lightweight, high strength, and good thermal stability, the explosive welding plate can enhance the performance and safety of automobiles.
Explosive welding plate cladding of metals supplier
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