Exactly what is Explosive Welding Plates?

Composite Plate, 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 utilizing 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 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, especially those that 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 much higher 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, 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 also often found that tilted impact to the tank on the shrapnel is going to be firmly welded to the tank armor phenomenon, just during the war individuals have no time to study it.

In 1947, the Siberian branch from 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 field of welding, the welding of various materials, like steel and aluminum, steel and copper, is technically very hard. And large welding depth of welding can also be very hard, if you want 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 perfect to resolve the 2 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 right 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 acting on the compound plate, promoting the top-speed movement from the compound plate, within the collision reason for 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 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. 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 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 high efficiency.

2. Metal composite
In the explosion molding, the necessity for metal composite. This task is usually used in explosion welding or explosion crimping and 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 powerful metallurgical bond.

3.Surface treatment
Surface therapy 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 methods can increase the wear resistance, corrosion resistance and aesthetics from the composite plate.

Explosive welding composite plate production process, although simple, flexible production, however 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.) 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 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 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 from the original material, based on the actual needs from the composite material to be 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 from the combination of materials compared to the combination of composite materials is very high strength, usually higher than the low side from 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 and other production.

For room temperature and 550 ? heat management of carbon steel surface layer (close to the interface layer) has serious deformation brought on by fibrous tissue and many fine particles, the center from the organization of ferrite plus pearlite; stainless steel interface for your second phase of point-like organization, the center from the needle-like organization. But by 650 ? management of carbon steel samples close to the interface area of small particles from the organization disappeared (that may occur decarburization), the grain becomes coarse, the center from the organization is still ferrite plus pearlite, but can not observed in the organization from the slip line produced by deformation; as well as in the stainless steel interface there are a large number of small black particles, titanium steel composite plate may be the decarburization of chromium carbide particles formed after the benefits of the fabric right 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 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 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., 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 huge discounts.”

Asia’s way to decarbonization has seen several breakthroughs, particularly as policymakers have committed to 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 sources of clean energy, namely direct reduction of iron from scrap or 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 surely give a major boost [in creating 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. “While this drive is stronger in some regions than the others, it is becoming a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology inside a short time to obtain rapid development and wide application, the main reason is 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 and other performance differences are incredibly disparate metal combinations to achieve composite. Like aluminum – steel, titanium – steel. Currently 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 meet the corrosion or wear resistance and 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 got the required high strength but also 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 time, and can be welded over a large area, an area as high as 20 square meters or more, within the composite interface, dissimilar metals with the metal bond to achieve inter-atomic bonding is generally not less than the minimum of the effectiveness of the composite material constituting the respective parent body.

(4) Good economy
The use of explosion welding technology to create 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, it can save you precious metal resources, reduce costs.

Use 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 and 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 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 can 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
In the aerospace field, explosive welding composite plates can be used to manufacture airplane fuselage, wings, engine parts, etc. Due to 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 can 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 can 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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