What is Explosive Welding Plates?

Nickel Plated Copper Sheet, which is, the metal composite plate produced 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 kind of composite material plate manufactured by using 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 large energy generated from the instantaneous generation of explosives to instantly composite two or more types of similar or dissimilar materials together, and this technology can weld alloys with different properties, especially those which are not dissolved, into one piece.

Compared with the direct rolling composite method:

(1) loading speed, which is, the loading process is instantaneous ;

(2) Applied to the workpiece high-pressure pulse load, loading stress is a lot greater 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) in 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 from the explosion and was welded together. In fact, in World War II, individuals 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 people have virtually no time to analyze 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 known as “explosive welding”.

In the field 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 can also be very hard, if you wish to use conventional welding, shielding welding as well as 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 ideal to resolve the two problems simultaneously.

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. After the explosion of explosives, the blast products form a higher-pressure pulse load, directly acting on the compound plate, promoting the high-speed movement from the compound plate, within the collision point of the compound plate and the substrate tilt collision, accompanied by violent plastic deformation and the formation from the jet, the jet takes away the surface 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 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 creation of explosive welding composite plates. In the explosion forming process, explosives in some 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 technique is characterized by high precision and efficiency.

2. Metal composite
In the explosion molding, the necessity for metal composite. This task is usually utilized in explosion welding or explosion crimping as well as other methods, two or more metal plates with the explosion energy combined together to create a composite material. During the metal composite process, a metallurgical reaction occurs between different metals, forming a strong metallurgical bond.

3.Surface treatment
Surface therapy is usually required to improve the surface quality and corrosion resistance from the explosive welding plate. Widely used surface treatment options include spraying, plating, chemical plating and so on. These methods 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 features a direct impact.

The composite interface includes direct bonding area, melting layer and vortex. Atomic diffusion exists in the bonding interface, and severe plastic deformation with work hardening occurs 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 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 very high strength, usually greater than the lower 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 as well as other production.

For room temperature and 550 ? heat treatment of carbon steel surface layer (close to the interface layer) has serious deformation caused by fibrous tissue and several fine particles, the center from the organization of ferrite plus pearlite; stainless steel interface for your second phase of point-like organization, the center from the needle-like organization. But by 650 ? treatment of carbon steel samples close to the interface section of small particles from the organization disappeared (that could occur decarburization), the grain becomes coarse, the center from the organization is still ferrite plus pearlite, but can not be seen in the organization from the slip line produced by deformation; as well as 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 price 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 your 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., 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 have to go somewhere. Producers can export to Europe, but that means they have to offer low-carbon products at huge discounts.”

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 build up 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 natural 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 certainly provide a major boost [in developing a green steel supply chain], but despite the advanced regulating 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. “While this drive is stronger in some regions than others, it is being a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology in a short time to acquire rapid development and wide application, the primary reason is that 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 as well as other performance differences are incredibly disparate metal combinations to accomplish composite. Like aluminum – steel, titanium – steel. At present has realized the composite material combination of more than 300 kinds, that is incomparable to other methods.

(2) Excellent material properties
Composite plate from the general design principle would be to satisfy the mechanical properties from the structure from the base material, compound plate to satisfy the corrosion or wear resistance as well as other properties. Therefore, in comparison with just one metal plate, the composite plate makes full utilisation of the best performance from the substrate, and the compound plate not just 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 time, and may be welded spanning a large area, a place as high as 20 square meters or more, within the composite interface, dissimilar metals with the metal bond to accomplish inter-atomic bonding is normally not under 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 corrosion resistance from the compound layer as well as 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 produced by the explosive welding method has been 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 with the corrosion resistance of precious metals, wear resistance, but additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently 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 repair life from the ship.

Aerospace
In 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 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. Because of 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. 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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