Stainless Steel Clad Plates for Hygienic Environments

Exactly what is Explosive Welding Plates?

Stainless Steel Clad Plate, 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 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 huge 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 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) 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 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, people in the repair of wounded tanks, but additionally often found that tilted impact to the tank around the shrapnel will be firmly welded to the tank armor phenomenon, just throughout the war people have 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 want 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 will do. However, the explosive welding is ideal to resolve the 2 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 because the energy source. Following the explosion of explosives, the blast products form a higher-pressure pulse load, directly acting on the compound plate, promoting the top-speed movement of the compound plate, within the collision reason for the compound plate as well as the substrate tilt collision, accompanied by violent plastic deformation as well as the formation of the jet, the jet eliminates the surface of the contamination layer, so the welded metal flat plate having a clean surface in contact with each other 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 initial step within the creation of explosive welding composite plates. In the explosion forming process, explosives in some conditions instantly detonated, the resulting high-pressure gas will be pushed to the opposite side of the metal plate mold, so the metal plate instantly to achieve the desired size and shape. This forming method is described as high precision and efficiency.

2. Metal composite
In the explosion molding, the need for metal composite. This task is usually used in explosion welding or explosion crimping and other methods, two 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 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, difficult to accurately control, the parent material properties (toughness, impact properties, etc.), explosives properties (bursting speed stability, safety, etc.), the first parameters (the quantity 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 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, that is beneficial to the improvement of bonding strength and tensile strength.

Explosive welding plate performance
Explosive welding explosive welding plate is not going to change the chemical composition and physical state of the original material, based on the actual needs of 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 of the mixture of materials compared to the mixture of composite materials is extremely high strength, usually greater than the low side of the mixture of materials, that 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 (near the interface layer) has serious deformation caused 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 ? management 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 is still ferrite plus pearlite, but could not observed 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 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 usage of performance greatly saves rare metal materials, thus reducing the production cost of equipment.

Weak demand and oversupply in Asia have pushed steelmakers in the area to develop 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 situation is further complicated by the fact that 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, so 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 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 committed to various climate targets and dealt with public and private stakeholders to develop low-carbon technologies.

These investments have enabled steelmakers to discover commercially viable technologies and reliable causes of clean energy, namely direct decrease in 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 to the steadily growing demand for green steel, given the quantity of pipeline investment.

“CBAM will certainly give a major boost [in developing a green steel supply chain], but despite the advanced regulation of steel emissions in Europe, the green steel premium is largely supported by the fact that increasingly more end-users are trying to reduce their overall carbon footprint,” says Frediani. “While this drive is stronger in some regions than others, it really is becoming a global phenomenon.”

Explosive composite explosion welding advantages
Explosive composite this new process, new technology in 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 could be combined it will make the melting point, strength, coefficient of thermal expansion and other performance differences are extremely disparate metal combinations to achieve composite. Like aluminum – steel, titanium – steel. Currently 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 would be 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 just one metal plate, the composite plate makes full use of the best performance of the substrate, as well as the compound plate not only has 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 really short time, and can be welded over a large area, a place of up to 20 square meters or even more, within the composite interface, dissimilar metals through the metal bond to achieve inter-atomic bonding is generally not under the minimum of the effectiveness of the composite material constituting the respective parent body.

(4) Good economy
The usage of explosion welding technology to produce composite plate products have both 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.

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 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 widely 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. Because of its high strength and good corrosion resistance, the explosive welding plate can effectively improve the durability and service life of the ship.

Aerospace
In the aerospace field, explosive welding composite plates can be used to manufacture airplane fuselage, wings, engine parts, etc. Because of its good thermal stability and 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. Because of its high strength and good corrosion resistance, explosive welding composite plate can improve 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 on. 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 become a professional in cladding metal solutions for 10 years. It is a professional company with supply and marketing integration.

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