What is Explosive Welding Plates?

Titanium Aluminium Clad Plate, which is, the metal composite plate created 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 utilizing explosive forming technology, and 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 from the instantaneous generation of explosives to instantly composite two or more kinds 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, which is, the loading process is instantaneous ;

(2) Placed on 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, 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 additionally 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 individuals have 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, like steel and aluminum, steel and copper, is technically very hard. And large welding depth of welding can also be very hard, if you wish to use conventional welding, shielding welding and 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 will 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 combines 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 higher-pressure pulse load, directly working on the compound plate, promoting the top-speed movement from the compound plate, within the collision point of the compound plate and the substrate tilt collision, combined with violent plastic deformation and the formation from the jet, the jet eliminates 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 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 within the creation of explosive welding composite plates. In the explosion forming process, explosives in certain conditions instantly detonated, the resulting high-pressure gas is going to be pushed towards the opposite side from the metal plate mold, so that the metal plate in an instant to achieve the desired shape and size. This forming method is characterized by high precision and efficiency.

2. Metal composite
In the explosion molding, the necessity for metal composite. This step is generally utilized in explosion welding or explosion crimping and other methods, two 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 therapy is usually needed to enhance the surface quality and corrosion resistance from the explosive welding plate. Widely used surface treatment options 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, but 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 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, which 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 very good, can withstand cold, hot processing without changing the thickness from the combination of materials compared to the combination of composite materials is extremely high strength, usually higher than the low side from the combination of materials, which 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 (near 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 near the interface section of small particles from the organization disappeared (that may occur decarburization), the grain becomes coarse, the heart from the organization is still ferrite plus pearlite, but can not seen in the business from the slip line created by deformation; as well as in the stainless steel interface there are a lot of small black particles, titanium steel composite plate could be the decarburization of chromium carbide particles formed after the advantages 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 lowering 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 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, 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 that 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 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 causes 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 market is reacting towards 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 despite 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. “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 variety of composite materials could 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. Such as aluminum – steel, titanium – steel. Currently has realized the composite material combination of over 300 kinds, which 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 meet the corrosion or wear resistance and other properties. Therefore, compared with a single metal plate, the composite plate makes full utilisation of the best performance from the substrate, and the compound plate not only 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 really short time, and may be welded spanning a large area, an area as high as 20 square meters or even more, within the composite interface, dissimilar metals with the metal bond to achieve inter-atomic bonding is normally not less than 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 produce composite plate products have both the 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.

Application of explosive welding plate
Composite materials created by the explosive welding method continues to be widely used in petroleum, chemical, shipbuilding, electronics, electric power, metallurgy, machinery, aerospace, atomic energy and 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 additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently widely 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. Due to its high strength and good corrosion resistance, the explosive welding plate can effectively enhance 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. Due to its good thermal stability and strength, explosive welding composite plate can enhance 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 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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