What is Explosive Welding Plates?

Titanium Clad Copper Rod, which 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, 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 two or more kinds of similar or dissimilar materials together, and this technology can weld metals with various properties, particularly those that are not dissolved, into one piece.

Compared with the direct rolling composite method:

(1) loading speed, which is, the loading process is instantaneous ;

(2) Placed on 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 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, 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 to the tank on the shrapnel is going to be firmly welded to the tank armor phenomenon, just throughout the war people have virtually no time to study 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 different materials, such as steel and aluminum, steel and copper, is technically very difficult. And large welding depth of welding is also very difficult, if you want 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 can do. However, the explosive welding is ideal 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 combines one or even 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 working on the compound plate, promoting the top-speed movement of the compound plate, within the collision reason for the compound plate and the substrate tilt collision, combined with violent plastic deformation and the formation of the jet, the jet takes away the top of the contamination layer, so that the welded metal flat plate having a clean surface in contact with one another at high temperatures and high 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 creation 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 other side of the metal plate mold, so that the metal plate in an instant to get the desired size and shape. This forming technique is described as high precision and high efficiency.

2. Metal composite
In the explosion molding, the need for metal composite. This task is usually utilized in explosion welding or explosion crimping as well as other methods, two 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 treatment is usually needed to improve the surface quality and corrosion resistance of the explosive welding plate. Widely used surface treatment options 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.) 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 consists of direct bonding area, melting layer and vortex. Atomic diffusion exists at 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 will not alter 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 than the mixture of composite materials is very high strength, usually higher than the lower side of the mixture of materials, which 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 management of carbon steel surface layer (near 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 the second phase of point-like organization, the heart of the needle-like organization. But by 650 ? management of carbon steel samples near 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 seen in the business of the slip line created by deformation; and in the stainless steel interface there are 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 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 use 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 region to develop supplies of low-carbon steel and iron, especially as 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 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 have to go somewhere. Producers can export to Europe, but that means they need to offer low-carbon products at huge discounts.”

Asia’s path to decarbonization has already 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 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 when compared with 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 provide a major boost [in creating 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 attempting to reduce their overall carbon footprint,” says Frediani. “While this drive is stronger in certain regions than the others, it is being a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology inside a short time to acquire rapid development and wide application, the main reason is that it has 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 accomplish composite. Such as aluminum – steel, titanium – steel. At present has realized the composite material combination of more than 300 kinds, which is incomparable with other methods.

(2) Excellent material properties
Composite plate of the general design principle is 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 use of the best performance of the substrate, and the compound plate not only has 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 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 under 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 of the compound layer as well as 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.

Application of explosive welding plate
Composite materials created 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 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 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 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. 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 may 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 may 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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