What is Explosive Welding Plates?

Explosive Welding, that is, the metal composite plate produced 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 kind 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 really a composite material processing technology that utilizes the large energy generated by the instantaneous generation of explosives to instantly composite 2 or more kinds of similar or dissimilar materials together, and this technology can weld metals with different properties, especially those which are not dissolved, into one piece.

In comparison with the direct rolling composite method:

(1) loading speed, that 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) inside 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. Actually, in World War II, people in the repair of wounded tanks, but also often found that tilted impact to the tank on the shrapnel will be firmly welded to the tank armor phenomenon, just during the war individuals 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, in his dissertation formally known 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 as well as 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 simultaneously.

Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that combines 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 working 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 eliminates the top of the contamination layer, so that the welded metal flat plate with 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 manufacture of explosive welding composite plates. Within the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas will be pushed to the other side from the metal plate mold, so that the metal plate instantly to achieve the desired size and shape. This forming technique is characterized by high precision and efficiency.

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

3.Surface treatment
Surface treatment is usually required to improve the surface quality and corrosion resistance from the explosive welding plate. Widely used surface treatment methods include spraying, plating, chemical plating and so on. These techniques 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, hard to accurately control, the parent material properties (toughness, impact properties, etc.), explosives properties (bursting speed stability, safety, etc.), the initial parameters (the amount 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 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, 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, according to the actual needs from the composite material to be 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 compared to the combination of composite materials is extremely high strength, usually greater 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 as well as 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 several 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 area of small particles from the organization disappeared (that could occur decarburization), the grain becomes coarse, the heart from the organization is still ferrite plus pearlite, but can not be observed in the business from the slip line produced by deformation; and in the stainless steel interface you will find 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 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 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 because 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, so we expect capacity additions to outpace demand growth, particularly 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 competitive prices.”

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 causes 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 amount of pipeline investment.

“CBAM will surely give a major boost [in developing a green steel supply chain], but regardless of the advanced regulation of steel emissions in Europe, the green steel premium is essentially supported because increasingly more end-users are trying to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in some regions than others, it really is becoming a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology inside a short period of time to acquire rapid development and wide application, the main 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 extremely disparate metal combinations to accomplish composite. Such as aluminum – steel, titanium – steel. At present has realized the composite material combination of over 300 kinds, which 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 satisfy the corrosion or wear resistance as well as other properties. Therefore, in comparison with a single metal plate, the composite plate makes full use of the best performance from the substrate, and the compound plate not only has 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 really short period of 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 the 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, it can save you 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 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 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 commonly used within 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. Due to its high strength and good corrosion resistance, the explosive welding plate can effectively improve 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. Due to its good thermal stability and strength, explosive welding composite plate can improve 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 on. Due to 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 may be used to manufacture body structural parts, engine parts, and so on. Due to 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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