What is Explosive Welding Plates?

Composite Plate, which is, the metal composite plate produced 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, 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, which technology can weld metals with various properties, especially those which are not dissolved, into one piece.

In comparison 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 a lot greater 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 pieces of 1-inch diameter, thickness of .035 inches of thin brass discs, because of the sudden impact of the explosion and was welded together. In fact, in World War II, people in the repair of wounded tanks, but additionally often found that tilted impact to the tank around the shrapnel is going to be firmly welded to the tank armor phenomenon, just during 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, within 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 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 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 ideal to solve the 2 problems simultaneously.

Explosive welding composite plate principle production method
Explosive welding is really a composite plate manufacturing method that combines one or 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 acting on the compound plate, promoting the top-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 surface of the contamination layer, so the welded metal flat plate with a clean surface in contact with each other 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 first step in the manufacture of explosive welding composite plates. In the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas is going to be pushed to the other side of the metal plate mold, so 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
In the explosion molding, the need for metal composite. This task is usually used 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. 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 of 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 of 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.) 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 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, which is beneficial 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 into the required optimal state.

Explosive welding plate application performance is superb, can withstand cold, hot processing without changing the thickness of the combination of materials compared to the combination of composite materials is extremely high strength, usually greater than the low side of the combination of materials, which 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 brought on by fibrous tissue and many fine particles, the heart of the organization of ferrite plus pearlite; stainless steel interface for your 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 could not be observed in the business of 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 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 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 area 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 problem 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 have to offer low-carbon products at competitive prices.”

Asia’s path to decarbonization has already seen several breakthroughs, particularly as policymakers have focused on 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 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 to 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 largely supported because more and more end-users are attempting to reduce their overall carbon footprint,” says Frediani. “Although this drive is stronger in certain regions than others, it 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 primary reason is it has 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 over 300 kinds, which is incomparable with 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, compared with just one metal plate, the composite plate makes full use of the best performance of the substrate, as well as the compound plate not just has 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 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 usage 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 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 produced 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 additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is currently 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 improve the durability and service 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 improve 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 improve the safety and service 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 improve the performance and safety of automobiles.

Explosive welding plate cladding of metals supplier
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