Exactly what is Explosive Welding Plates?

Titanium Clad Steel Plate, that is, the metal composite plate created by the explosive welding method (explosion welding method), explosive welding plate generally refers to 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 such as explosive forming, metal composite, and surface treatment.

Metal explosive welding technology is a composite material processing technology that utilizes the huge energy generated by the instantaneous generation of explosives to instantly composite 2 or more types of similar or dissimilar materials together, and this technology can weld alloys with different properties, particularly 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) 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 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, 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 also often discovered that tilted impact towards the tank on the shrapnel will be firmly welded towards the tank armor phenomenon, just throughout the war people have virtually 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 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 large welding depth of welding is also very hard, if you wish 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 can do. However, the explosive welding is ideal 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 because the energy source. Following 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 reason for the compound plate and the substrate tilt collision, accompanied by violent plastic deformation and the formation of the jet, the jet eliminates the surface 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 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 certain conditions instantly detonated, the resulting high-pressure gas will be pushed towards the other side of the metal plate mold, so the metal plate in an instant to achieve the desired shape and size. This forming method is described as high precision and high efficiency.

2. Metal composite
In the explosion molding, the necessity for metal composite. This step is usually used in explosion welding or explosion crimping as well as other methods, 2 or more metal plates through 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 of the explosive welding plate. Commonly used surface treatment options include spraying, plating, chemical plating and so on. These methods can increase 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 first 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.) 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 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 is not going to alter the chemical composition and physical state of the original material, according to 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 combination of materials than the combination of composite materials is extremely high strength, usually higher than the low side of the combination 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 treatment of carbon steel surface layer (close to the interface layer) has serious deformation caused by fibrous tissue and several fine particles, the heart of the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the heart of the needle-like organization. But by 650 ? treatment of carbon steel samples close to the interface section of small particles of the organization disappeared (that may occur decarburization), the grain becomes coarse, the heart of the organization continues to be ferrite plus pearlite, but can not observed in the organization of the slip line created 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 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 cost of equipment.

Weak demand and oversupply in Asia have pushed steelmakers in the area to build up supplies of low-carbon steel and iron, especially because the Jan. 31 reporting deadline for the 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 have to go somewhere. Producers can export to Europe, but that means they need to offer low-carbon products at huge discounts.”

Asia’s way 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 discover commercially viable technologies and reliable sources 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 market is reacting towards the steadily growing demand for green steel, given the amount 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 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 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 will 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. 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 of the general design principle would be to satisfy the mechanical properties of the structure of 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 utilisation of the best performance of the substrate, and the compound plate not only 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 can be welded spanning a large area, a place of up to 20 square meters or more, in the composite interface, dissimilar metals through the metal bond to achieve inter-atomic bonding is generally 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 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.

Application 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 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 currently commonly 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 of the ship.

Aerospace
In 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
In the construction industry, explosive welding composite plates may 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 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 on. 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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