What is Explosive Welding Plates?

Copper Clad Steel, which is, the metal composite plate created 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 type of composite material plate manufactured by using 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 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 different properties, particularly 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 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) 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 from the explosion and was welded together. In fact, in World War II, people in the repair of wounded tanks, but additionally often found 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 study 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, in his dissertation formally referred to as “explosive welding”.

In the area of welding, the welding of different 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 into a 80mm thick wide plate, it really 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 mixes one or 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 acting on the compound plate, promoting the top-speed movement from the compound plate, in the collision reason for the compound plate as well as the substrate tilt collision, combined with violent plastic deformation as well as the formation from the jet, the jet eliminates 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 in the creation of explosive welding composite plates. In the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas will be pushed to the opposite side from the metal plate mold, so the metal plate instantly to get the desired shape and size. This forming method is described as high precision and high efficiency.

2. Metal composite
In the explosion molding, the need for metal composite. This step is usually utilized in explosion welding or explosion crimping and other methods, 2 or more metal plates with the explosion energy combined together to form a composite material. During the metal composite process, a metallurgical reaction occurs between different metals, forming a powerful metallurgical bond.

3.Surface treatment
Surface treatment is usually needed 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, however the technical requirements are high, hard 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.) as well as 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 in the bonding interface, and severe plastic deformation with work hardening occurs in the bonding zone. The bonding surface has 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 from the original material, based on the actual needs from 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 from the combination of materials than the combination of composite materials is extremely high strength, usually higher than the low side from the combination 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 treatment of carbon steel surface layer (close to the interface layer) has serious deformation brought on by fibrous tissue and many fine particles, the heart from the organization of ferrite plus pearlite; stainless steel interface for your second phase of point-like organization, the heart 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 may occur decarburization), the grain becomes coarse, the heart from the organization continues to be ferrite plus pearlite, but could not observed in the organization from the slip line created 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 advantages 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 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 develop supplies of low-carbon steel and iron, especially as 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., want to introduce similar policies.

A Singaporean trader said, “Asian steel producers have not slowed down production and want to increase output, so 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 seen several 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 reduction of iron from scrap or natural gas, or shifting to electric arc furnace steelmaking, that features a lower carbon intensity when compared with blast furnaces.

Paolo Frediani, senior analyst at Fastmarkets, said the market is reacting to 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 regardless of the advanced regulation of steel emissions in Europe, the green steel premium is largely supported because more and more end-users are attempting to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in certain regions than others, it really is becoming a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology in a short period of time to obtain rapid development and wide application, the main reason is that it has the following four advantages:

(1) A variety of composite materials can be combined it will make the melting point, strength, coefficient of thermal expansion and other performance differences are incredibly disparate metal combinations to achieve 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 meet the mechanical properties from the structure from 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 from the substrate, as well as the compound plate not just 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 spanning a large area, an area of up to 20 square meters or more, in the composite interface, dissimilar metals with 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 from 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 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 additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is now commonly 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. Because of its high strength and good corrosion resistance, the explosive welding plate can effectively improve the durability and service 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 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. 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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