What is Explosive Welding Plates?

Composite Plate, that 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 utilizing explosive forming technology, and 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 2 or more types 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, that 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 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, due to 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 towards the tank around the shrapnel will be firmly welded towards the tank armor phenomenon, just during the war people have no time to study 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 area of welding, the welding of various materials, like 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 and other welding methods will be two 40mm thick wide plate welded right into a 80mm thick wide plate, it really is estimated that no one can do. However, the explosive welding is perfect 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 as 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 high-speed movement from the compound plate, in the collision reason for the compound plate and the substrate tilt collision, combined with violent plastic deformation and the formation from the jet, the jet eliminates the top of the contamination layer, so the welded metal flat plate having a clean surface in contact with each other 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 in the creation of explosive welding composite plates. Within the explosion forming process, explosives in certain conditions instantly detonated, the resulting high-pressure gas will be pushed towards the other side from the metal plate mold, so the metal plate in an instant to get the desired shape and size. This forming technique is characterized by high precision and high efficiency.

2. Metal composite
Within the explosion molding, the need for metal composite. This task is generally utilized 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. Throughout 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 enhance the surface quality and corrosion resistance from the explosive welding plate. Commonly used surface treatment methods include spraying, plating, chemical plating and so forth. These techniques 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 first 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 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 happens in the bonding zone. The bonding surface has a wavy structure, which is helpful 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 from the original material, according to 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 greater than the low side from the combination of materials, which is unattainable by other technologies. The composite material will not 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 (near the interface layer) has serious deformation brought on by fibrous tissue and several fine particles, the heart from the organization of ferrite plus pearlite; stainless steel interface for the second phase of point-like organization, the heart from the needle-like organization. But by 650 ? management 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 observed in the organization 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 advantages 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 region to build up 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 this means they have to offer low-carbon products at competitive prices.”

Asia’s path to decarbonization has already 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 discover commercially viable technologies and reliable sources of clean energy, namely direct decrease in 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 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 regardless of the advanced regulation of 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 others, it really is being a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology in a short period of time to acquire rapid development and wide application, the primary reason is that it has got the following four advantages:

(1) A variety of composite materials can be combined it can 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 more than 300 kinds, which is incomparable to 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 satisfy the corrosion or wear resistance and other properties. Therefore, compared with a single metal plate, the composite plate makes full use of the best performance from the substrate, and the compound plate not just 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 period of time, and may be welded spanning a large area, a place of up to 20 square meters or even more, in the composite interface, dissimilar metals with the metal bond to achieve inter-atomic bonding is normally not less than the a minimum of the strength 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 the corrosion resistance from the compound layer and other functional characteristics and both the strength 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 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 now 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 enhance the durability and repair life from 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 enhance 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 enhance 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 enhance the performance and safety of automobiles.

Explosive welding plate cladding of metals supplier
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