Exactly 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 kind of composite material plate manufactured by using 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, which technology can weld alloys with different 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 a lot 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 bits of 1-inch diameter, thickness of .035 inches of thin brass discs, due to the sudden impact of the explosion and was welded together. Actually, in World War II, people in the repair of wounded tanks, but additionally 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 the study of 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 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 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 at the same time.

Explosive welding composite plate principle production method
Explosive welding is a composite plate manufacturing method that combines one or more materials 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 high-speed movement of the compound plate, in the collision point of the compound plate and the substrate tilt collision, accompanied by violent plastic deformation and the formation of the jet, the jet takes away the surface of the contamination layer, so the welded metal flat plate having a clean surface in contact with one another at high temperatures and 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 in the manufacture of explosive welding composite plates. Within 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 the metal plate in an instant to achieve the desired shape and size. This forming method is characterized by high precision and efficiency.

2. Metal composite
Within the explosion molding, the need for metal composite. This task is usually used in explosion welding or explosion crimping and other methods, 2 or more metal plates through 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 required to enhance the surface quality and corrosion resistance of the explosive welding plate. Commonly used surface treatment methods include spraying, plating, chemical plating and so forth. 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, 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.) 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 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 helpful 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 superb, can withstand cold, hot processing without changing the thickness of the combination of materials than the combination of composite materials is very high strength, usually greater than the low side of 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 treatment of carbon steel surface layer (close to the interface layer) has serious deformation caused by fibrous tissue and many 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 close to the interface section of small particles of the organization disappeared (that could occur decarburization), the grain becomes coarse, the center of the organization continues to be ferrite plus pearlite, but could not be seen in the organization of the slip line created by deformation; and in the stainless steel interface you will find a large number of small black particles, titanium steel composite plate could be the decarburization of chromium carbide particles formed after the benefits of the fabric 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 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 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, so 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 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 compared to 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 give 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 largely supported because more and more end-users are attempting to reduce their overall carbon footprint,” says Frediani. “Although 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 in a short time to obtain rapid development and wide application, the primary reason is that it has got the following four advantages:

(1) A number 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. Such as 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 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 and other properties. Therefore, compared with a single metal plate, the composite plate makes full use of the best performance of the substrate, and the compound plate not just has got 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 very short time, and can be welded over a large area, an area as high as 20 square meters or more, in the composite interface, dissimilar metals through 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 use of explosion welding technology to produce composite plate products have both the corrosion resistance of 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.

Application of explosive welding plate
Composite materials created by the explosive welding method continues to be 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 additionally with carbon steel, good weldability, molding, extensibility, thermal conductivity; explosive welding plate is now commonly used in 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 enhance the durability and service life of the ship.

Aerospace
Within 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 strength, explosive welding composite plate can enhance the performance and safety of aircraft.

Construction Industry
Within the construction industry, explosive welding composite plates can 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 enhance the safety and service life of buildings.

Automobile manufacturing
In automobile manufacturing, explosive welding composite plates can 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 enhance the performance and safety of automobiles.

Explosive welding plate cladding of metals supplier
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