What is Explosive Welding Plates?
Cladding Of Metals, that is, the metal composite plate created 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 type of composite material plate manufactured by utilizing explosive forming technology, along with its manufacturing process involves multiple steps like explosive forming, metal composite, and surface treatment.
Metal explosive welding technology is really a composite material processing technology that utilizes the huge energy generated from the instantaneous generation of explosives to instantly composite two or more types of similar or dissimilar materials together, which technology can weld alloys with different properties, particularly those that 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) Placed on the workpiece high-pressure pulse load, loading stress is much higher 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 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, 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 additionally often found that tilted impact to the tank around the shrapnel is going to be firmly welded to the tank armor phenomenon, just throughout the war individuals have no time to study it.
In 1947, the Siberian branch from 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 referred to as “explosive welding”.
In the field of welding, the welding of different materials, like steel and aluminum, steel and copper, is technically very hard. And large welding depth of welding can also be very hard, if you want to use conventional welding, shielding welding and other welding methods is going to 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 at the same time.
Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that mixes one or more materials into a single piece using explosives because the energy source. Following the explosion of explosives, the blast products form a higher-pressure pulse load, directly working on the compound plate, promoting the high-speed movement from the compound plate, within the collision point of the compound plate as well as the substrate tilt collision, accompanied by violent plastic deformation as well as the formation from the jet, the jet takes away the top of the contamination layer, so that the welded metal flat plate having a clean surface in contact with one another at high temperatures and 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 initial step within 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 to the opposite side from the metal plate mold, so that the metal plate in an instant to achieve the desired size and shape. This forming method is described as high precision and efficiency.
2. Metal composite
Within the explosion molding, the necessity 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 create a composite material. Throughout the metal composite process, a metallurgical reaction occurs between different metals, forming a strong metallurgical bond.
Surface therapy is usually required to improve the surface quality and corrosion resistance from the explosive welding plate. Commonly used surface treatment options include spraying, plating, chemical plating and so on. These techniques can increase 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 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 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 will not alter the chemical composition and physical state from the original material, based on the actual needs from the composite material to be individually processed into 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 compared to the mixture of composite materials is extremely high strength, usually higher than the low 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 center from the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the center 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 may occur decarburization), the grain becomes coarse, the center from the organization continues to be ferrite plus pearlite, but can not observed in the organization from the slip line created by deformation; and in the stainless steel interface you will find 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 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 lowering the production cost 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 the European Union’s Carbon Boundary Adjustment Mechanism (CBAM) draws nearer, market participants said.
The problem 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, therefore 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 this means they need to offer low-carbon products at competitive prices.”
Asia’s way to decarbonization has already seen several breakthroughs, particularly as policymakers have focused on 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 sources of clean energy, namely direct reduction of iron from scrap or gas, or shifting to electric arc furnace steelmaking, which has a lower carbon intensity compared to blast furnaces.
Paolo Frediani, senior analyst at Fastmarkets, said the marketplace is reacting to the steadily growing demand for green steel, given the quantity of pipeline investment.
“CBAM will surely give a major boost [in developing a green steel supply chain], but regardless of the advanced regulation of steel emissions in Europe, the green steel premium is largely supported by the fact that more and more end-users are attempting to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in some 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 period of time to acquire rapid development and wide application, the main 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 incredibly disparate metal combinations to achieve composite. Such as aluminum – steel, titanium – steel. At present has realized the composite material combination of more than 300 kinds, that is incomparable with other methods.
(2) Excellent material properties
Composite plate from the general design principle is to satisfy the mechanical properties from the structure from the base material, compound plate to meet the corrosion or wear resistance and other properties. Therefore, compared 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 only has got 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 may be welded spanning a large area, an area of up to 20 square meters or more, within the composite interface, dissimilar metals with 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, you can save precious metal resources, reduce costs.
Application of explosive welding plate
Composite materials created by the explosive welding method has been 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 now commonly used within the petrochemical industry, metallurgy, salt production and alkali production, the water industry, Nuclear industry.
In shipbuilding, explosive welding plates may be used to manufacture hull structures, decks, bulkheads, etc. Due to its high strength and good corrosion resistance, the explosive welding plate can effectively improve the durability and service life from the ship.
Within the aerospace field, explosive welding composite plates may be used to manufacture airplane fuselage, wings, engine parts, etc. Due to its good thermal stability and strength, explosive welding composite plate can improve the performance and safety of aircraft.
Within the construction industry, explosive welding composite plates may be used to manufacture structural parts for bridges, high-rise buildings, highways, and so on. Due to its high strength and good corrosion resistance, explosive welding composite plate can improve the safety and service life of buildings.
In automobile manufacturing, explosive welding composite plates may be used to manufacture body structural parts, engine parts, and so on. Due to 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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