Exactly what is Explosive Welding Plates?

Copper Clad Aluminum Sheet, that is, the metal composite plate produced by the explosive welding method (explosion welding method), explosive welding plate generally means the explosion of the metal composite plate. An explosive welding composite plate is a type of composite material plate manufactured by using explosive forming technology, along with 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 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 various properties, especially those that are not dissolved, into one piece.

Compared 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 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, due to the sudden impact of the explosion and was welded together. Actually, in World War II, individuals the repair of wounded tanks, but also often discovered that tilted impact towards the tank around the shrapnel is going to be firmly welded towards the tank armor phenomenon, just throughout the war people have virtually 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, within his dissertation formally known as “explosive welding”.

In the field of welding, the welding of different materials, like steel and aluminum, steel and copper, is technically very difficult. And huge welding depth of welding is also very difficult, if you wish 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 is estimated that no one will do. However, the explosive welding is perfect to solve the two problems at the same time.

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 because the energy source. Following the explosion of explosives, the blast products form a high-pressure pulse load, directly acting on the compound plate, promoting the top-speed movement of the compound plate, in the collision reason for the compound plate and the substrate tilt collision, combined with violent plastic deformation and the formation of the jet, the jet eliminates the top of the contamination layer, so that the welded metal flat plate with 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 in the manufacture of explosive welding composite plates. Within the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas is going to be pushed towards the other side of the metal plate mold, so that the metal plate in an instant to get the desired shape and size. This forming method is characterized by high precision and efficiency.

2. Metal composite
Within the explosion molding, the need for metal composite. This task is usually used 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. During the metal composite process, a metallurgical reaction occurs between different metals, forming a powerful metallurgical bond.

3.Surface treatment
Surface therapy is usually needed to enhance the surface quality and corrosion resistance of the explosive welding plate. Commonly used surface treatment methods include spraying, plating, chemical plating and so forth. These methods can boost 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 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.) 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 happens in the bonding zone. The bonding surface features 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 of the original material, based on the actual needs of the composite material to become individually processed into 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 compared to the mixture of composite materials is extremely high strength, usually higher than the lower side of 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 brought on by fibrous tissue and several fine particles, the center of the organization of ferrite plus pearlite; stainless steel interface for your second phase of point-like organization, the center of the needle-like organization. But by 650 ? management of carbon steel samples near the interface section of small particles of the organization disappeared (that may occur decarburization), the grain becomes coarse, the center of the organization is still ferrite plus pearlite, but can not be observed in the business of the slip line produced by deformation; and in the stainless steel interface there are a large number of small black particles, titanium steel composite plate could be the decarburization of chromium carbide particles formed after the benefits of the fabric 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 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 because the Jan. 31 reporting deadline for your 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., are looking to introduce similar policies.

A Singaporean trader said, “Asian steel producers have not slowed down production and are looking to increase output, so 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 competitive prices.”

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, that features a lower carbon intensity compared to 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 provide a major boost [in creating a green steel supply chain], but despite the advanced regulating steel emissions in Europe, the green steel premium is largely supported because increasingly 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 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 got 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, 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 satisfy 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 of the substrate, and the compound plate not just has got 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 can be welded spanning a large area, an area 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 under 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 corrosion resistance of the compound layer and 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 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 also with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently commonly 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 enhance the durability and service life of 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 strength, explosive welding composite plate can enhance 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 enhance 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 enhance the performance and safety of automobiles.

Explosive welding plate cladding of metals supplier
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