Dust-removal and environmentally-friendly explosive welding method

Abstract

The present invention relates to the field of explosive welding of layered metal composite materials. The present invention provides a dust-removal and environmentally-friendly explosive welding method, comprising: manufacturing a water-sand foundation on which an explosive welding device is placed; laying water bags and detonating cords around the explosive welding device; and finally, simultaneously detonating the explosive welding device and the detonating cords to complete the explosive welding of the layered metal composite materials. According to the dust-removal and environmentally-friendly explosion welding method of the present invention, the water-sand foundation as an explosion foundation can not only reduce formation of dust during explosive welding at the source, but can also improve the interface bonding performance of the layered metal composite materials; and the water bags are arranged around the explosive welding device, the detonating cords are detonated to cause the water bags to be nebulized, and the nebulized water comes into contact with the dust generated by explosive welding, thereby achieving the effect of rapid dust removal. The two dust removal methods work together, the operation is simple, the state of explosive distribution does not need to be changed, the welding quality is not affected, and the effect of dust removal is also greatly improved.

Description

A dust-removing and environmentally friendly explosive welding method Technical Field

[0001] This invention relates to the field of explosive welding of layered metal composite materials, and more specifically, to an explosive welding method that is dust-free and environmentally friendly. Background Technology

[0002] Explosive-welded layered metal composites are widely used in thermal power, petrochemical, water conservancy and hydropower, bridges, and shipbuilding industries due to their corrosion resistance and transition bonding properties. According to industry statistics, the annual demand for layered metal composites reaches 500,000 tons, requiring an explosive welding processing area of ​​3 million square meters.

[0003] At present, explosive welding has realized the metallurgical bonding of layered metal composite materials. However, most of the explosive welding operations in China are carried out in open mountain environments. The foundation of the construction site for explosive welding is generally clay or sand, which will generate a large amount of dust under the action of the explosive shock wave.

[0004] The main problems with this explosive welding method currently include the following aspects:

[0005] 1. The explosion force is large and the dust is relatively dry, making it difficult for the dust to settle quickly, which has a significant impact on the health of on-site workers.

[0006] 2. Dust in the air can fall into the interior of the substrate and cladding in subsequent operations. If it cannot be completely removed during explosive welding, it will affect the interface bonding performance, especially the explosive welding bonding performance of non-ferrous metals such as titanium, aluminum, and silver, and may even cause the risk of product scrapping.

[0007] 3. In order to minimize the impact of welding dust from explosions on worker health and the quality of interface bonding, water spraying equipment was used to spray dust into the air. However, this method is inefficient and affects the efficiency of subsequent operations.

[0008] The prior art patent application CN202210736391.8 discloses an environmentally friendly explosive welding composite plate production method that can simultaneously suppress dust and reduce harm. First, the oxide layer on the surfaces to be bonded of the base plate and the cladding plate is removed. Second, the base plate is placed horizontally on a foundation, and supports of uniform height are evenly distributed on the top surface to be bonded of the base plate. Then, the cladding plate is placed face down on top of the supports. Next, an explosive box is placed on top of the cladding plate, and expanded ammonium nitrate explosive is evenly distributed inside the explosive box. Then, a plastic film is laid on top of the expanded ammonium nitrate explosive, and then water is injected into the cavity formed by the plastic film inside the explosive box. Then, a detonator is inserted vertically into the expanded ammonium nitrate explosive through the gap between the plastic film and the side wall of the explosive box, and against the middle of the inner wall of the explosive box. Finally, the detonator is detonated to complete the explosive welding. While this patented technology can simultaneously reduce dust and harmful gas diffusion during blasting, the process of laying a plastic film on top of the explosive and then filling the cavity formed by the film with water presents several challenges. First, the operation is difficult, and the flatness of the water layer is hard to control. Second, the force exerted by the water on the explosive increases the density of the explosive below the water layer, altering its properties and affecting the welding quality. Furthermore, the dust removal effect is poor.

[0009] In view of this, the present invention is hereby proposed. Summary of the Invention

[0010] The purpose of this invention is to propose a dust-free and environmentally friendly explosive welding method to solve the problems of existing explosive welding methods for layered metal composite materials. These methods involve laying a plastic film on top of the explosive and then injecting water into the cavity formed by the plastic film. On the one hand, this is difficult to operate, and the flatness of the water layer is hard to control. On the other hand, the mass of the water exerts force on the explosive, increasing the density of the explosive below the water layer, altering the explosive's properties, and thus affecting the welding quality. Furthermore, the dust removal effect is poor.

[0011] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0012] An environmentally friendly explosive welding method for dust removal includes the following steps:

[0013] S1. Constructing a water-sand base:

[0014] S2. Place the explosive welding device on the sand-water base;

[0015] S3. Place water bags and detonating cords around the explosive welding device.

[0016] S4. Finally, the explosive welding device and detonating cord are detonated simultaneously to complete the explosive welding of the layered metal composite material.

[0017] The dust-removing and environmentally friendly explosive welding method of this invention comprises interconnected and inseparable steps S1 to S4. In step S1, the water-sand base serves as the explosive base, which not only reduces dust formation during explosive welding at the source but also, due to the increased density of water-sand compared to dry sand, reduces the stress reflection effect of the explosive welding stress wave generated when the cladding plate collides with the substrate and propagates to the substrate and water-sand base. This reduces the damage to the interface performance caused by the explosive reflection stress and improves the interface bonding performance. In step S3, water bags and detonating cords are placed around the explosive welding device. In step S4, the detonation of the detonating cord causes the water bags to atomize, coming into contact with the dust generated during explosive welding, thus achieving a rapid dust removal effect. The dust-removing and environmentally friendly explosive welding method described in this invention has the following advantages: 1. Simple operation, improving the efficiency of explosive welding operations; 2. No need to change the explosive placement, which not only does not affect the welding quality but also improves the interfacial bonding performance of layered metal composite materials; 3. Dust removal and environmental protection: on the one hand, it achieves rapid dust removal while completing the explosive welding of layered metal composite materials; on the other hand, the combined effect of water-sand base and water bag dust removal methods greatly improves the dust removal effect and effectively protects the respiratory health of on-site operators; 4. It can also prevent dust from entering the substrate surface of subsequent explosive welding operations, improving the quality of subsequent plate explosive welding; 5. The next explosive operation can be carried out 5 minutes after explosive welding, avoiding the impact of dust on subsequent operations, shortening the waiting time, and the welding quality of the second batch still maintains a high level.

[0018] Furthermore, step S1 specifically involves: first, mixing sand and water evenly according to a certain mass ratio; then, constructing a wooden frame of a certain height at the blast site; and finally, filling the wooden frame with the water-sand mixture to form a water-sand foundation.

[0019] Furthermore, the mass ratio of sand to water is 85:15 to 75:25, and the sand and water are mixed evenly using a mixer.

[0020] Furthermore, the length and width of the wooden frame are both 400mm larger than the base plate of the explosive welding device, and the height of the wooden frame is 100-300mm.

[0021] Further, step S2 specifically involves: the explosive welding device includes a base plate, a support member, a cover plate, explosives and a first detonator; the base plate is placed on the water-sand foundation; the support member is installed on the surface of the base plate; the cover plate is placed on top of the support member; and explosives are laid on the upper surface of the cover plate.

[0022] Furthermore, the height of the support member is 5~20mm.

[0023] Furthermore, step S3 specifically involves: placing water bags around the explosive welding device, placing a detonating cord of the same length at the bottom of the water bags, and installing a second detonator on the detonating cord.

[0024] Furthermore, in the width direction of the explosive welding device, the distance between the water bag and the explosive welding device is K1, and K1 satisfies: K1≥2m; in the length direction of the explosive welding device, the distance between the water bag and the explosive welding device is K2, and K2 satisfies: K2≥2m.

[0025] Furthermore, the water bag is provided with a water inlet that can be opened and closed.

[0026] Furthermore, step S4 specifically involves inserting a first detonator into one end of the explosive, simultaneously detonating the first detonator and the second detonator, with the first detonator igniting the explosive and the second detonator igniting the detonating cord.

[0027] This invention proposes a dust-removing and environmentally friendly explosive welding method. Compared with the prior art, the dust-removing and environmentally friendly explosive welding method of this invention has the following beneficial effects:

[0028] 1. The dust-removing and environmentally friendly explosive welding method described in this invention is simple to operate and improves the efficiency of explosive welding operations.

[0029] 2. The dust-removing and environmentally friendly explosive welding method described in this invention does not require changing the explosive placement state, which not only does not affect the welding quality, but also improves the interfacial bonding performance of layered metal composite materials.

[0030] 3. The dust-removing and environmentally friendly explosive welding method described in this invention is dust-removing and environmentally friendly, capable of quickly reducing dust and absorbing toxic gases, effectively protecting the respiratory health of on-site workers.

[0031] 4. The dust-removing and environmentally friendly explosive welding method described in this invention can also prevent dust from entering the substrate surface of subsequent explosive welding operations, thereby improving the quality of subsequent explosive welding of the plates. Attached Figure Description

[0032] Figure 1 is a cross-sectional schematic diagram of the explosive welding device used in the dust removal and environmental protection explosive welding method according to an embodiment of the present invention;

[0033] Figure 2 is a top view of an explosive welding method for dust removal and environmental protection according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. First detonator; 2. Explosive; 3. Cover plate; 4. Support component; 5. Base plate; 6. Water and sand foundation; 7. Second detonator; 8. Water bag; 9. Detonating cord; 10. Explosive welding device. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. The descriptions of "first," "second," etc., mentioned in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0038] In the existing technology, when explosively welding layered metal composite materials, a plastic film is laid on top of the explosive 2, and then water is injected into the cavity formed by the plastic film. On the one hand, the operation is difficult and the flatness of the water layer is hard to control; on the other hand, the mass of the water exerts force on the explosive 2, which increases the density of the explosive 2 below the water layer, changes the properties of the explosive 2, and thus affects the welding quality; in addition, there is the problem of poor dust removal effect.

[0039] To address the aforementioned technical problems, as shown in Figures 1-2, this embodiment proposes a dust-removing and environmentally friendly explosive welding method, which includes the following steps:

[0040] S1. Constructing the water-sand foundation 6:

[0041] S2. Place the explosive welding device 10 on the water-sand foundation 6;

[0042] S3. Place water bags 8 and detonating cord 9 around the explosive welding device 10.

[0043] S4. Finally, the explosive welding device 10 and the detonating cord 9 are detonated simultaneously to complete the explosive welding of the layered metal composite material.

[0044] The dust-removing and environmentally friendly explosive welding method of this invention comprises interconnected and inseparable steps S1 to S4. In step S1, the water-sand foundation 6 serves as the explosive foundation, which not only reduces dust formation during explosive welding at its source but also, due to the increased density of water-sand compared to dry sand, reduces the stress reflection effect of the explosive welding stress wave generated when the composite plate 3 collides with the substrate 5, thus reducing the damage to the interface performance caused by the explosive reflection stress and improving the interface bonding performance. In step S3, water bags 8 and detonating cords 9 are placed around the explosive welding device 10. In step S4, the explosive welding device 10 is detonated, triggering the detonating cord 9, causing the water bags 8 to atomize and come into contact with the dust generated by the explosive welding, achieving a rapid dust removal effect. The water-sand foundation 6, water bags 8, detonating cords 9, and explosive welding device 10 are interconnected and inseparable, playing multiple roles.

[0045] I. Simple operation, improving the efficiency of explosive welding operations.

[0046] II. Reduce dust formation: Water-sand foundation 6 serves as an explosive foundation, which can reduce dust formation during explosive welding from the source.

[0047] 3. Improve the interfacial bonding performance: It does not require changing the distribution state of explosive 2, which not only does not affect the welding quality, but also improves the interfacial bonding performance of layered metal composite materials. This is because the density of water sand is relatively higher than that of dry sand, thereby reducing stress reflection and thus reducing the damage to the interfacial performance caused by the explosion reflection stress.

[0048] IV. Rapid Dust Removal: The explosion of the detonating cord 9 causes the water bag 8 to atomize, which quickly comes into contact with the dust generated by the explosive welding, achieving a dust removal effect and further reducing the dust concentration in the air.

[0049] V. Protecting Workers' Health: Effectively reduces dust and toxic gases from explosive welding operations, protecting the respiratory health of on-site workers.

[0050] VI. Improved work efficiency: The next explosion operation can be carried out 5 minutes after the explosion welding, avoiding the impact of dust on subsequent operations and shortening the waiting time; and the welding quality of the second batch of welding still maintains a high level.

[0051] VII. Improved welding quality: Dust was prevented from entering the surface of the substrate 5 for subsequent explosive welding operations, thus improving the quality of subsequent explosive welding of the plates.

[0052] Specifically, step S1 is as follows: first, mix sand and water evenly according to a certain mass ratio; then, build a wooden frame of a certain height at the explosion site; and then fill the wooden frame with the water-sand mixture to form a water-sand foundation 6.

[0053] Specifically, the mass ratio of sand to water is 85:15 to 75:25, and a mixer is used to mix the sand and water evenly.

[0054] Specifically, the length and width of the wooden frame are both 400mm larger than the base plate 5 of the explosive welding device 10, and the height of the wooden frame is 100-300mm.

[0055] Specifically, step S2 is as follows: the explosive welding device 10 includes a base plate 5, a support member 4, a cover plate 3, explosive 2 and a first detonator 1. The base plate 5 is placed on the water-sand foundation 6, the support member 4 is installed on the surface of the base plate 5, the cover plate 3 is placed on the support member 4, and explosive 2 is laid on the upper surface of the cover plate 3.

[0056] Specifically, the height of the support member 4 is 5~20mm.

[0057] Specifically, the support member 4 is made of metal.

[0058] Specifically, the material of the support member 4 can be copper, aluminum, or stainless steel, and is not limited to these.

[0059] More specifically, in this embodiment, the support member 4 is made of copper.

[0060] Specifically, the detonation velocity of the explosive 2 is 1800~2500m / s.

[0061] Specifically, step S3 involves placing water bags 8 around the explosive welding device 10, placing a detonating cord 9 of the same length at the bottom of the water bags 8, and setting a second detonator 7 on the detonating cord 9.

[0062] More specifically, in this embodiment, the water bag 8 is arranged in a square shape.

[0063] Specifically, in the width direction of the explosive welding device 10, the distance between the water bag 8 and the explosive welding device 10 is K1, and K1 satisfies: K1≥2m; in the length direction of the explosive welding device 10, the distance between the water bag 8 and the explosive welding device 10 is K2, and K2 satisfies: K2≥2m.

[0064] Specifically, the water bag 8 is a plastic cylindrical bag with a water inlet that can be opened and closed.

[0065] Specifically, the diameter of the plastic cylindrical bag is 100-300mm, and the diameter of the detonating cord 9 is 2-8mm.

[0066] Specifically, step S4 is as follows: insert the first detonator 1 into one end of the explosive 2, and simultaneously detonate the first detonator 1 and the second detonator 7. The first detonator 1 detonates the explosive 2, and the second detonator 7 detonates the detonating cord 9, thereby achieving rapid dust removal while performing explosive welding.

[0067] The explosion of the explosive 2 pushes the composite plate 3 and the base plate 5 to achieve explosive welding. The explosion of the detonating cord 9 causes the water inside the water bag 8 to atomize in all directions, and come into contact with the dust generated by the explosive welding, thus achieving a rapid dust removal effect.

[0068] Since the water-sand base 6 contains a certain amount of water, it has a certain dust removal effect. In addition, the explosion of the detonating cord 9 causes the water inside the water bag 8 to atomize in all directions, which combines with the dust generated in the area around the explosion welding, thus achieving the dust removal effect again.

[0069] The purpose of this invention is to provide a manufacturing method that can rapidly reduce explosive welding dust, thereby reducing the harm of dust to the health of on-site workers, improving interface bonding performance and work efficiency.

[0070] This invention innovatively proposes a water-sand foundation 6 as an explosive foundation on the basis of traditional sandy soil. This not only reduces the formation of dust during explosive welding, but also increases the density of water-sand compared to dry sand. This reduces the stress reflection effect when the explosive welding stress wave formed when the composite plate 3 collides with the base plate 5 propagates to the base plate 5 and the water-sand foundation 6, thus reducing the damage to the interface performance caused by the explosive reflection stress and improving the interface bonding performance.

[0071] This invention innovatively proposes a dust removal method by placing water bags 8 around the explosive welding device 10. The water bags 8 are atomized by the explosion of the detonating cord 9, and come into contact with the dust generated by the explosive welding, thus achieving a rapid dust removal effect.

[0072] By employing the above two dust removal methods, this invention effectively reduces dust during explosive welding operations, not only protecting the respiratory health of on-site workers but also preventing dust from entering the surface of the substrate 5 for subsequent explosive welding operations, thereby improving the quality of subsequent explosive welding of the plates.

[0073] By employing the above two dust removal methods, this invention eliminates the need for additional spray dust suppression equipment after an explosion, saving process costs. It also allows for the commencement of the next explosion operation just 5 minutes after the explosion welding, significantly shortening waiting time and improving operational efficiency.

[0074] More specifically, in this embodiment, the substrate 5 is made of 16mm CCSB steel, and the length and width of the substrate 5 are 1000×2500mm; the cladding plate 3 is made of 6mm TA1 steel, and the length and width of the cladding plate 3 are 1000×2500mm.

[0075] More specifically, step S1 is as follows: first, mix sand and water evenly according to a certain mass ratio; then, build a wooden frame of a certain height at the explosion site; and then fill the wooden frame with the water-sand mixture to form a water-sand foundation 6.

[0076] More specifically, the mass ratio of sand to water is 80:20, and the sand and water are mixed evenly using a mixer.

[0077] More specifically, the wooden frame is 2900mm long, 1400mm wide, and 100mm high.

[0078] More specifically, the height of the support member 4 is 9mm; the material of the support member 4 is copper.

[0079] Specifically, the explosive 2 is a powdered emulsion explosive 2, and the thickness of the explosive 2 is 40mm.

[0080] Specifically, the water bag 8 has a diameter of 150mm and a length of 26000mm.

[0081] The detonating cord 9 has a diameter of 2mm and its length is the same as that of the water bag 8.

[0082] In this embodiment, the detonating cord 9 is fixed to the bottom of the water bag 8 using tape.

[0083] Specifically, in the width direction of the explosive welding device 10, the distance between the water bag 8 and the explosive welding device 10 is K1, and K1 satisfies: K1=2m; in the length direction of the explosive welding device 10, the distance between the water bag 8 and the explosive welding device 10 is K2, and K2 satisfies: K2=2m.

[0084] After the explosion, wait 5 minutes before entering the site for the next batch of operations.

[0085] The content of the second batch of assignments is exactly the same as that of the first batch. Example

[0086] In this embodiment, unlike in embodiment 1,

[0087] The mass ratio of sand to water is 85:15.

[0088] The height of the wooden frame is 300mm.

[0089] Specifically, the height of the support member 4 is 5mm; the material of the support member 4 is stainless steel.

[0090] K1=2.5m, K2=2.5m.

[0091] Specifically, the diameter of the plastic cylindrical bag is 100mm, and the diameter of the detonating cord 9 is 4mm. Example

[0092] In this embodiment, unlike in embodiment 1,

[0093] The mass ratio of sand to water is 75:25.

[0094] The height of the wooden frame is 200mm.

[0095] Specifically, the height of the support member 4 is 20mm; the material of the support member 4 can also be stainless steel.

[0096] K1=2.2m, K2=2.2m.

[0097] Specifically, the diameter of the plastic cylindrical bag is 300mm, and the diameter of the detonating cord 9 is 8mm.

[0098] Comparative Example 1

[0099] Explosive welding was performed using the explosive welding method of Embodiment 1 of the prior art patent application number CN202210736391.8.

[0100] The shear properties and composite ratio of the metal composite materials obtained by explosive welding using the explosive welding methods described in Examples 1-3 and Comparative Example 1 were tested. The test standard for shear properties was GB / 6396-2008, and the test standard for composite ratio was NB / T47013.3-2023. The test results for shear properties and composite ratio are shown in Table 1.

[0101] Explosive welding was performed using the explosive welding methods described in Examples 1-3 and Comparative Example 1. The dust concentration 5 minutes after the explosion was tested, and the results are shown in Table 1.

[0102]

[0103] As shown in Table 1, the layered metal composite materials obtained by explosive welding using the methods described in Examples 1-3, regardless of whether it is the first or second batch, all exhibit shear properties greater than or equal to 302 MPa, a composite rate of 100%, and dust concentrations less than 8 mg / m³ 5 minutes after the explosion. 3 .

[0104] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A dust-removing and environmentally friendly explosive welding method, characterized in that, The explosive welding method includes the following steps: S1. Constructing a water-sand foundation (6): S2. Place the explosive welding device (10) on the water and sand foundation (6); S3. Place water bags (8) and detonating cord (9) around the explosive welding device (10). S4. Finally, the explosive welding device (10) and the detonating cord (9) are detonated simultaneously to complete the explosive welding of the layered metal composite material.

2. The dust-removing and environmentally friendly explosive welding method according to claim 1, characterized in that, Step S1 is as follows: First, mix sand and water evenly according to a certain mass ratio; then build a wooden frame of a certain height at the explosion site; then fill the wooden frame with the water-sand mixture to form a water-sand foundation (6).

3. The dust-removing and environmentally friendly explosive welding method according to claim 2, characterized in that, The mass ratio of sand to water is 85:15 to 75:25, and the sand and water are mixed evenly using a mixer.

4. The dust-removing and environmentally friendly explosive welding method according to claim 2, characterized in that, The length and width of the wooden frame are both 400mm larger than the base plate (5) of the explosive welding device (10), and the height of the wooden frame is 100-300mm.

5. The dust-removing and environmentally friendly explosive welding method according to claim 1, characterized in that, Step S2 is as follows: The explosive welding device (10) includes a base plate (5), a support member (4), a cover plate (3), explosives (2) and a first detonator (1). The base plate (5) is placed on the water-sand foundation (6), the support member (4) is installed on the surface of the base plate (5), the cover plate (3) is placed above the support member (4), and explosives (2) are laid on the upper surface of the cover plate (3).

6. The dust-removing and environmentally friendly explosive welding method according to claim 5, characterized in that, The height of the support member (4) is 5~20mm.

7. The dust-removing and environmentally friendly explosive welding method according to claim 5, characterized in that, Step S3 specifically involves placing water bags (8) around the explosive welding device (10), placing a detonating cord (9) of the same length at the bottom of the water bags (8), and setting a second detonator (7) on the detonating cord (9).

8. The dust-removing and environmentally friendly explosive welding method according to claim 7, characterized in that, In the width direction of the explosive welding device (10), the distance between the water bag (8) and the explosive welding device (10) is K1, and K1 satisfies: K1≥2m; in the length direction of the explosive welding device (10), the distance between the water bag (8) and the explosive welding device (10) is K2, and K2 satisfies: K2≥2m.

9. The dust-removing and environmentally friendly explosive welding method according to claim 8, characterized in that, The water bag (8) is provided with a water inlet, which can be opened and closed.

10. The dust-removing and environmentally friendly explosive welding method according to claim 7, characterized in that, Step S4 is as follows: Insert the first detonator (1) into one end of the explosive (2), and simultaneously detonate the first detonator (1) and the second detonator (7). The first detonator (1) detonates the explosive (2), and the second detonator (7) detonates the detonating cord (9).

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