What is Explosive Welding Plates?
Stainless Steel Clad Plate, 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 utilizing explosive forming technology, along with 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 from the instantaneous generation of explosives to instantly composite 2 or more kinds of similar or dissimilar materials together, which technology can weld alloys with different properties, especially 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 a lot higher 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 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 of the explosion and was welded together. In fact, in World War II, individuals the repair of wounded tanks, but additionally often discovered that tilted impact to the tank on 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 of 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 referred to as “explosive welding”.
In the field of welding, the welding of different 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 will be two 40mm thick wide plate welded right into a 80mm thick wide plate, it is estimated that no one will do. However, the explosive welding is perfect to solve the 2 problems simultaneously.
Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that mixes one or even more materials right into a single piece using explosives as 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 top-speed movement of the compound plate, within the collision reason for the compound plate as well as the substrate tilt collision, accompanied by violent plastic deformation as well as the formation of 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 each other 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 initial step within the manufacture of explosive welding composite plates. Within the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas will be pushed to the opposite side of the metal plate mold, so the metal plate in an instant to get the desired shape and size. This forming method is characterized by high precision and high 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, 2 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 powerful metallurgical bond.
3.Surface treatment
Surface treatment is usually required to improve the surface quality and corrosion resistance of the explosive welding plate. Commonly used surface treatment methods include spraying, plating, chemical plating and so on. These techniques can increase 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, difficult 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 occurs 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 change the chemical composition and physical state of the original material, according to the actual needs of 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 of the mixture of materials than the mixture of composite materials is very high strength, usually higher than the lower side of 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 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 several fine particles, the heart of the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the heart 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 heart of the organization continues to be ferrite plus pearlite, but can not be seen in the organization of the slip line produced by deformation; and in the stainless steel interface you will find a lot of small black particles, titanium steel composite plate may be the decarburization of chromium carbide particles formed after the advantages 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 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 develop 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 problem is further complicated by the fact that 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, 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 have to offer low-carbon products at huge discounts.”
Asia’s path to decarbonization has already seen a number of breakthroughs, particularly as policymakers have committed to various climate targets and worked with public and private stakeholders to develop low-carbon technologies.
These investments have enabled steelmakers to explore commercially viable technologies and reliable causes 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 marketplace is reacting to the steadily growing demand for green steel, given the amount of pipeline investment.
“CBAM will surely give a major boost [in developing 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 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 in a short period of time to acquire rapid development and wide application, the primary reason is that it has 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. Such as aluminum – steel, titanium – steel. Currently has realized the composite material combination of more than 300 kinds, that 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 meet the corrosion or wear resistance as well as other properties. Therefore, in comparison with just one metal plate, the composite plate makes full use of the best performance of the substrate, as well as the compound plate not only has the required high strength but additionally 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 very short period of time, and can be welded over a large area, a place of up to 20 square meters or even more, within the composite interface, dissimilar metals through the metal bond to achieve inter-atomic bonding is generally not less than the minimum of the strength 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 of the compound layer as well as other functional characteristics and both the strength 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 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 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 now 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 improve the durability and service life of the ship.
Aerospace
Within 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 improve the performance and safety of aircraft.
Construction Industry
Within 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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