Exactly what is Explosive Welding Plates?

Copper Clad Steel, that 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 utilizing 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 huge 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, 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) Placed on the workpiece high-pressure pulse load, loading stress is much 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 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 from the explosion and was welded together. Actually, in World War II, people in the repair of wounded tanks, but also often discovered that tilted impact to the tank on the shrapnel will be firmly welded to the tank armor phenomenon, just throughout the war individuals 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 various materials, such as steel and aluminum, steel and copper, is technically very difficult. And large welding depth of welding can also be very difficult, 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 two problems at the same time.

Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that mixes one or more materials right into a single piece using explosives because the energy source. Following 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, in the collision point of 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 takes away the top of the contamination layer, so that the welded metal flat plate having a clean surface in contact with each other at high temperatures and high 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 certain conditions instantly detonated, the resulting high-pressure gas will be pushed to the opposite side from the metal plate mold, so that the metal plate instantly to achieve the desired size and shape. This forming method is characterized by high precision and high efficiency.

2. Metal composite
Within the explosion molding, the need for metal composite. This step is generally utilized in explosion welding or explosion crimping as well as other methods, 2 or more metal plates with the explosion energy combined together to create a composite material. Throughout the metal composite process, a metallurgical reaction occurs between different metals, forming a strong metallurgical bond.

3.Surface treatment
Surface treatment is usually required to enhance the surface quality and corrosion resistance from the explosive welding plate. Commonly used surface treatment methods include spraying, plating, chemical plating and so forth. These methods can increase 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, 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.) 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 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, 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 greater 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 as well as other production.

For room temperature and 550 ? heat treatment of carbon steel surface layer (near 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 near the interface section of small particles from the organization disappeared (that could occur decarburization), the grain becomes coarse, the center from the organization continues to be ferrite plus pearlite, but can not seen in the organization from the slip line created by deformation; and in the stainless steel interface there are a lot 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 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 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., 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, especially 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 already seen a number of breakthroughs, particularly as policymakers have focused on 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 decrease in 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 quantity of pipeline investment.

“CBAM will certainly give 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 attempting to reduce their overall carbon footprint,” says Frediani. “While this drive is stronger in certain regions than others, it is being 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 main reason is that it has got the following four advantages:

(1) A number of composite materials could be combined it can make the melting point, strength, coefficient of thermal expansion as well as other performance differences are extremely disparate metal combinations to achieve composite. Such as aluminum – steel, titanium – steel. Currently has realized the composite material combination of over 300 kinds, that is incomparable with other methods.

(2) Excellent material properties
Composite plate from the general design principle is to meet the mechanical properties from the structure from the base material, compound plate to meet the corrosion or wear resistance as well as 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 got the required high strength but also 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 may be welded spanning a large area, an area as high as 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 a minimum of the strength 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 the corrosion resistance from 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.

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 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 also with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is now widely 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. Because of its high strength and good corrosion resistance, the explosive welding plate can effectively enhance the durability and repair life from the ship.

Aerospace
Within the aerospace field, explosive welding composite plates may be used to manufacture airplane fuselage, wings, engine parts, etc. Because of its good thermal stability and high 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. Because of its high strength and good corrosion resistance, explosive welding composite plate can enhance the safety and repair 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. Because of 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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