Exactly what is Explosive Welding Plates?
Cladding Of Metals, that is, the metal composite plate produced 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 utilizing 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 huge energy generated by the instantaneous generation of explosives to instantly composite two 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.
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 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. Actually, in World War II, individuals the repair of wounded tanks, but additionally often discovered that tilted impact towards the tank around the shrapnel will be firmly welded towards the tank armor phenomenon, just throughout the war individuals 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 area of welding, the welding of various materials, such as steel and aluminum, steel and copper, is technically very difficult. And huge welding depth of welding is also very difficult, if you want 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 will do. However, the explosive welding is ideal to resolve the two problems at the same time.
Explosive welding composite plate principle production method
Explosive welding is really 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 high-speed movement from the compound plate, in the collision reason for the compound plate and the substrate tilt collision, combined with violent plastic deformation and the formation from the jet, the jet takes away the surface of the contamination layer, so the welded metal flat plate having a clean surface in contact with one another at high temperatures and high 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 first 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 will be pushed towards the opposite side from the metal plate mold, so the metal plate in an instant to get the desired shape and size. This forming technique is characterized by high precision and high efficiency.
2. Metal composite
Within the explosion molding, the necessity for metal composite. This step is usually utilized in explosion welding or explosion crimping and other methods, two or more metal plates through 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.
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 options 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, 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.) and 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 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 has a wavy structure, which is helpful to the improvement of bonding strength and tensile strength.
Explosive welding plate performance
Explosive welding explosive welding plate is not going to change the chemical composition and physical state from the original material, based on the actual needs from the composite material to become individually processed in to 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 compared to the mixture of composite materials is extremely high strength, usually higher than the lower side from the mixture of materials, which 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 management of carbon steel surface layer (near the interface layer) has serious deformation caused by fibrous tissue and several 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 may occur decarburization), the grain becomes coarse, the heart from the organization is still ferrite plus pearlite, but can not observed in the business from the slip line produced 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 material 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 price 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 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, especially in the post-epidemic recovery period.” . “…… Products need to go somewhere. Producers can export to Europe, but that means they need to offer low-carbon products at huge discounts.”
Asia’s way to decarbonization has seen several breakthroughs, particularly as policymakers have committed to various climate targets and worked with public and private stakeholders to build up low-carbon technologies.
These investments have enabled steelmakers to explore 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 when compared with blast furnaces.
Paolo Frediani, senior analyst at Fastmarkets, said the marketplace is reacting towards 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 despite the advanced regulating steel emissions in Europe, the green steel premium is largely supported by the fact that 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 is becoming 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 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 more than 300 kinds, which 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 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, and 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 over a large area, an area of up to 20 square meters or even more, in the composite interface, dissimilar metals through the metal bond to accomplish inter-atomic bonding is generally not less than the a minimum of the strength of the composite material constituting the respective parent body.
(4) Good economy
The usage of explosion welding technology to create composite plate products have both corrosion resistance from the compound layer and other functional characteristics and both the strength of the grass-roots level and plastic toughness indicators, you can save 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 using the corrosion resistance of precious metals, wear resistance, but additionally 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 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.
Aerospace
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 high 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 forth. Due to 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 forth. 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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