What is Explosive Welding Plates?

Copper Clad Steel, which is, the metal composite plate created 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 type of composite material plate manufactured by using 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 types of similar or dissimilar materials together, and this technology can weld metals with different properties, particularly 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 much 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 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, because of the sudden impact from 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 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 huge 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 can do. However, the explosive welding is ideal to resolve the two problems simultaneously.

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 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 from the compound plate, within the collision point of the compound plate as well as the substrate tilt collision, accompanied by violent plastic deformation as well as 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. In the explosion forming process, explosives in certain conditions instantly detonated, the resulting high-pressure gas is going to be pushed to the opposite side from the metal plate mold, so that the metal plate in an instant to get the desired size and shape. This forming method is described as high precision and efficiency.

2. Metal composite
In the explosion molding, the need for metal composite. This task is usually used 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 treatment is usually required to improve the surface quality and corrosion resistance from the explosive welding plate. Commonly 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, difficult 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.) 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 in the bonding interface, and severe plastic deformation with work hardening occurs in the bonding zone. The bonding surface has 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 change the chemical composition and physical state from the original material, based on the actual needs from the composite material to be 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 mixture of materials compared to the mixture of composite materials is extremely high strength, usually greater than the low side from the mixture 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 and other production.

For room temperature and 550 ? heat treatment of carbon steel surface layer (near the interface layer) has serious deformation caused 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 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 created by deformation; as well as 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 benefits of the material 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 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 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, therefore 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 way to decarbonization has seen several breakthroughs, particularly as policymakers have focused on various climate targets and dealt with public and private stakeholders to develop 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 natural gas, or shifting to electric arc furnace steelmaking, which has a lower carbon intensity when compared with 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 certainly provide a major boost [in developing a green steel supply chain], but regardless of the advanced regulating steel emissions in Europe, the green steel premium is essentially supported because increasingly 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 being 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 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 incredibly disparate metal combinations to accomplish composite. Like aluminum – steel, titanium – steel. At present 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 meet 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 just one metal plate, the composite plate makes full utilisation of the best performance from the substrate, as well as 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 period of time, and can be welded over a large area, a place as high as 20 square meters or even more, within the composite interface, dissimilar metals with the metal bond to accomplish inter-atomic bonding is normally not less than 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 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.

Use of explosive welding plate
Composite materials created by the explosive welding method has been widely used in petroleum, chemical, shipbuilding, electronics, electric power, metallurgy, machinery, aerospace, atomic energy and 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 additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is now widely 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 service life from the ship.

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