What is Explosive Welding Plates?

Cladding Of Metals, which is, the metal composite plate produced by the explosive welding method (explosion welding method), explosive welding plate generally means the explosion of 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 such as 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 2 or more kinds of similar or dissimilar materials together, and this 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 much 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) 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 of the explosion and was welded together. In fact, in World War II, individuals the repair of wounded tanks, but additionally often found 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 the study of polymer bombs to penetrate the armor also found this phenomenon, in his dissertation formally referred to as “explosive welding”.

In the area of welding, the welding of different materials, such as steel and aluminum, steel and copper, is technically very difficult. And huge welding depth of welding can also be very difficult, 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 is estimated that no one will 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 combines one or even more materials into a single piece using explosives because the energy source. Following the explosion of explosives, the blast products form a higher-pressure pulse load, directly working on the compound plate, promoting the high-speed movement of the compound plate, within 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 takes away the top of the contamination layer, so the welded metal flat plate with 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 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 towards the opposite side of the metal plate mold, so the metal plate in an instant to achieve the desired size and shape. This forming technique is characterized by high precision and high efficiency.

2. Metal composite
Within the explosion molding, the necessity for metal composite. This step is generally 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. 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 of the explosive welding plate. Widely used surface treatment methods include spraying, plating, chemical plating and so forth. These techniques 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 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 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, that is beneficial 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 of the original material, according to the actual needs of 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 of the mixture of materials compared to the mixture of composite materials is very high strength, usually greater than the lower side of the mixture of materials, that 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 center of the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the center of the needle-like organization. But by 650 ? treatment of carbon steel samples near the interface area of small particles of the organization disappeared (that may occur decarburization), the grain becomes coarse, the center of the organization continues to be ferrite plus pearlite, but can not be seen 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 may be the decarburization of chromium carbide particles formed after the benefits 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 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 problem is further complicated by the fact that 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 have to offer low-carbon products at huge discounts.”

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 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, 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 amount of pipeline investment.

“CBAM will certainly provide 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 by the fact that 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 in 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 can be combined it will make the melting point, strength, coefficient of thermal expansion as well as other performance differences are incredibly disparate metal combinations to achieve composite. Like aluminum – steel, titanium – steel. At present has realized the composite material combination of over 300 kinds, that is incomparable with other methods.

(2) Excellent material properties
Composite plate of the general design principle is to meet the mechanical properties of the structure of the base material, compound plate to meet 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 of the substrate, as well as the compound plate not just has got 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, a place of up to 20 square meters or even more, within the composite interface, dissimilar metals with the metal bond to achieve inter-atomic bonding is generally not under 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 the 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.

Application of explosive welding plate
Composite materials produced by the explosive welding method continues to be 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 with 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 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 repair life of the ship.

Aerospace
Within 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
Within the construction industry, explosive welding composite plates may be used to manufacture structural parts for bridges, high-rise buildings, highways, and so forth. Because of 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 forth. 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
Luoyang Trunnano Tech Co., Ltd has been a professional in cladding metal solutions for 10 years. It is a professional company with supply and marketing integration.

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