Exactly what is Explosive Welding Plates?

Cladding Of Metals, which 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 utilizing 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 large energy generated by the instantaneous generation of explosives to instantly composite two or more kinds of similar or dissimilar materials together, and this technology can weld metals with different properties, especially those that 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 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 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 of the explosion and was welded together. In fact, in World War II, individuals the repair of wounded tanks, but additionally often discovered that tilted impact to the tank on the shrapnel is going to be firmly welded to the tank armor phenomenon, just during the war individuals have 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, in his dissertation formally referred to as “explosive welding”.

In the area of welding, the welding of various materials, like steel and aluminum, steel and copper, is technically very hard. And large welding depth of welding is also very hard, if you want to use conventional welding, shielding welding as well as other welding methods is going to be two 40mm thick wide plate welded right into a 80mm thick wide plate, it is estimated that no one can do. However, the explosive welding is perfect to resolve the 2 problems at the same time.

Explosive welding composite plate principle production method
Explosive welding is a composite plate manufacturing method that mixes 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 high-pressure pulse load, directly working on the compound plate, promoting the high-speed movement of 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 of the jet, the jet eliminates the top of the contamination layer, so the welded metal flat plate having a clean surface in contact with one another 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 first 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 to the opposite side of the metal plate mold, so the metal plate instantly to achieve the desired size and shape. This forming technique is described as high precision and high efficiency.

2. Metal composite
Within the explosion molding, the need for metal composite. This step is usually used in explosion welding or explosion crimping as well as other methods, two 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 strong metallurgical bond.

3.Surface treatment
Surface therapy is usually required to enhance the surface quality and corrosion resistance of the explosive welding plate. Widely used surface treatment methods include spraying, plating, chemical plating and so forth. These techniques can boost the wear resistance, corrosion resistance and aesthetics of 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 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.) of the choice and system coordination of the composite plate of the finished product yield and quality has a direct impact.

The composite interface includes 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 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 is not going to alter the chemical composition and physical state of the original material, based on the actual needs of the composite material to become individually processed in to the required optimal state.

Explosive welding plate application performance is very good, 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 higher than the lower side of the mixture of materials, that is unattainable by other technologies. The composite material is not going to delaminate or crack during subsequent heat treatment, leveling, cutting, rolling, spinning as well as other production.

For room temperature and 550 ? heat management of carbon steel surface layer (close to the interface layer) has serious deformation brought on 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 may occur decarburization), the grain becomes coarse, the center of the organization continues to be 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 right 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 lowering 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 the European Union’s Carbon Boundary Adjustment Mechanism (CBAM) draws nearer, market participants said.

The problem 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, 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 need to offer low-carbon products at huge discounts.”

Asia’s path to decarbonization has seen a number of breakthroughs, particularly as policymakers have committed to 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 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 to the steadily growing demand for green steel, given the quantity of pipeline investment.

“CBAM will certainly give a major boost [in creating a green steel supply chain], but regardless of the advanced regulating steel emissions in Europe, the green steel premium is essentially supported by the fact that more and more end-users are trying to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in certain regions than the others, it is being a global phenomenon.”

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

(1) A number of composite materials can 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 accomplish composite. Like 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 of the general design principle is to satisfy the mechanical properties of the structure of the base material, compound plate to meet the corrosion or wear resistance as well as other properties. Therefore, compared with a single metal plate, the composite plate makes full use of the best performance of the substrate, as well as the compound plate not only has got 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 really short time, and can be welded spanning a large area, a place as high as 20 square meters or even more, in the composite interface, dissimilar metals with the metal bond to accomplish inter-atomic bonding is normally not under the a 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 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.

Use of explosive welding plate
Composite materials produced by the explosive welding method continues to be 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 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. 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 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 enhance the performance and safety of aircraft.

Construction Industry
Within the construction industry, explosive welding composite plates can 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 can 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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