What is Explosive Welding Plates?
Copper Clad Aluminum Sheet, that is, the metal composite plate created 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 kind 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 large energy generated from the instantaneous generation of explosives to instantly composite 2 or more kinds of similar or dissimilar materials together, and this technology can weld alloys with various properties, particularly those which are not dissolved, into one piece.
Compared 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 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 bits of 1-inch diameter, thickness of .035 inches of thin brass discs, because of the sudden impact of the explosion and was welded together. In fact, in World War II, people in the repair of wounded tanks, but also often found that tilted impact towards the tank around the shrapnel will be firmly welded towards the tank armor phenomenon, just during the war people have no time to study 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, in his dissertation formally known as “explosive welding”.
In the area of welding, the welding of various materials, such as steel and aluminum, steel and copper, is technically very hard. And huge welding depth of welding is also very hard, if you want to use conventional welding, shielding welding and other welding methods will 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 2 problems simultaneously.
Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that combines one or even more materials right into a single piece using explosives as 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 point of the compound plate and the substrate tilt collision, combined with violent plastic deformation and the formation of the jet, the jet takes away the top of the contamination layer, so the welded metal flat plate having 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 first step in the manufacture of explosive welding composite plates. In the explosion forming process, explosives in certain conditions instantly detonated, the resulting high-pressure gas will be pushed towards the opposite side of the metal plate mold, so the metal plate instantly to get the desired shape and size. This forming technique is characterized by 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, 2 or more metal plates through the explosion energy combined together to form a composite material. Throughout the metal composite process, a metallurgical reaction occurs between different metals, forming a strong metallurgical bond.
3.Surface treatment
Surface therapy is usually needed 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, 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 first parameters (the amount of explosives per unit area, the base compound plate spacing, etc.) and 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 in 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 be individually processed in to the required optimal state.
Explosive welding plate application performance is superb, can withstand cold, hot processing without changing the thickness of the mixture of materials than the mixture of composite materials is extremely 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 and other production.
For room temperature and 550 ? heat management of carbon steel surface layer (close to the interface layer) has serious deformation caused by fibrous tissue and many fine particles, the center of the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the center of the needle-like organization. But by 650 ? management of carbon steel samples close to 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 can not observed in the business of the slip line created 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 fabric right into a whole, giving full play to the usage of different metal materials, and greatly save rare and rare materials, and the usage of different metal materials. The use 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 area 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, 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 have to offer low-carbon products at huge discounts.”
Asia’s way 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 build up low-carbon technologies.
These investments have enabled steelmakers to discover commercially viable technologies and reliable causes 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 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 because more and more end-users are attempting to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in some regions than the 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 obtain 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 and other performance differences are extremely disparate metal combinations to achieve composite. Like 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 of the general design principle is to meet the mechanical properties of the structure of the base material, compound plate to meet 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 of the substrate, and the compound plate not just has the required high strength but also has excellent corrosion resistance, wear resistance, and other properties of high production efficiency.
(3) High production efficiency/high bond strength.
Explosive composite in a really short period of time, and may be welded spanning a large area, a place as high as 20 square meters or even more, in the composite interface, dissimilar metals through the metal bond to achieve inter-atomic bonding is generally not less than the 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 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.
Use of explosive welding plate
Composite materials created by the explosive welding method has been 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 also 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 can 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 repair life of the ship.
Aerospace
In the aerospace field, explosive welding composite plates can 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
In the construction industry, explosive welding composite plates can 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 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 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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