Explosive welding method for preparing super-thick large-area composite plate based on nickel-based alloy plate

Abstract

The invention discloses an explosive welding method for preparing a super-thick large-area composite plate based on a nickel-based alloy plate. A steel plate serves as a base plate, a plurality of supporting blocks are laid, a nickel alloy plate is placed on the supporting blocks, then powdery emulsion explosive is laid, a detonator is placed, and finally the super-thick large-area nickel-based alloy composite plate is prepared after explosive cladding and detection are qualified. According to the explosive welding method for preparing the super-thick and large-area composite board based on the nickel-based alloy board, explosive cladding of the super-thick and large-area nickel-based alloy composite board is achieved, the fitting rate, the shear strength and other performance of the composite board can meet the requirements, and the mechanical performance and the corrosion resistance can meet the requirements of development of the industries such as equipment manufacturing and chemical engineering.

Description

Technical Field

[0001] The invention relates to the technical field of composite plate preparation, and in particular to an explosion welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates. Background Art

[0002] Nickel alloy plate is a corrosion-resistant alloy with the largest usage, the widest application and excellent comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated alkali solution; it is also resistant to corrosion from neutral solutions, water, seawater, atmosphere, organic compounds, etc., and is widely used in seawater and other fields. An important feature of this alloy is that it generally does not produce stress corrosion cracks and has good cutting performance.

[0003] With the rapid development of the domestic chemical industry in recent years, the application of explosive composite to prepare composite plates has become more and more common. The mechanism of explosive composite is to use the energy generated by the explosion of explosives to push the composite plate to collide with the base plate at high speed to produce a high-speed jet, thereby obtaining metallurgical bonding between atoms. Because the explosion process will produce a jet, the surface of the base composite plate will be self-cleaned, allowing the metal to bond. However, when the plate width is too large, the jet material will increase, and the jet material cannot be completely eliminated after reaching the two ends. Part of the jet is confined in the bonding area, resulting in poor bonding strength at both ends or even non-fitting. Therefore, it is very necessary to develop an explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates. The prepared ultra-thick large-area nickel-based alloy composite plates meet the use requirements of chemical and other industries, save materials, and extend the service life of equipment. Summary of the invention

[0004] The purpose of the present invention is to provide an explosion welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates to solve the above defects.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An explosive welding method for preparing an ultra-thick large-area composite plate based on a nickel-based alloy plate comprises the following steps:

[0007] S1. Prepare the steel plates and nickel alloy plates that have been polished once before the explosion;

[0008] S2. On the ground foundation of the explosion site, a steel plate is used as a base plate for laying, and the upper end surface of the steel plate is scrubbed with acetone liquid; and then a number of support blocks are laid at equal intervals on the upper end surface of the steel plate;

[0009] S3, prepare the main explosive for use, the selected main explosive is powdered emulsion explosive;

[0010] S4, scrubbing the lower end surface of the nickel alloy plate with acetone solution, and placing the nickel alloy plate on a plurality of support blocks, and evenly applying butter on the end surface of the nickel alloy plate with a brush to form a butter layer acting as a buffer layer, the butter layer thickness is 1mm, and the butter layer is covered with powdered emulsion explosive;

[0011] S5. Set a detonator at one end of the powdered emulsion explosive on the nickel alloy plate as the detonation point, fix the detonator, and then connect the lead of the detonator 50m away from the explosion site, which is the explosion safety distance;

[0012] S6, spreading a film on the powdered emulsion explosive, and then spreading the pre-prepared mixed auxiliary material of sand and bran on the film;

[0013] S7. Detonators and powdered emulsion explosives are detonated to compound the steel plate and the nickel alloy plate by explosion, and then heat treated, leveled, and repaired by welding and grinding at the detonation point. After passing the test, the finished product of ultra-thick large-area nickel-based alloy composite plate is obtained.

[0014] Preferably, the steel plate is made of 20MnMoIV steel, the thickness of the steel plate is 456 mm, and the plate width size is φ4300 mm.

[0015] Preferably, the nickel alloy plate is a N04400 alloy plate with a thickness of 8 mm and a plate width of φ4350 mm.

[0016] Preferably, in step S1, the surfaces of the steel plate and the nickel alloy plate to be bonded are both ground and polished with a 40-mesh sand belt to remove surface oxide scale and debris.

[0017] Preferably, in step S2, the support blocks include a support block 1 with a height of 14 mm, a support block 2 with a height of 16 mm and a support block 3 with a height of 18 mm, and there are a plurality of support blocks 1, 2 and 3. A plurality of support blocks 1 are arranged on the side of the steel plate close to the detonation point, a plurality of support blocks 3 are arranged on the side of the steel plate away from the detonation point, and a plurality of support blocks 2 are arranged between support blocks 1 and 2 on the steel plate.

[0018] Preferably, in step S4, the powdered emulsion explosive is laid in three areas, namely, an area on one side of the detonation point, an area away from the detonation point, and an area between the two areas; the powdered emulsion explosive in the area on one side of the detonation point has an explosion velocity of 1800 M / s, a force of 5.5 mm, a density of 0.95 g / cm3, and a thickness of 38 mm; the powdered emulsion explosive in the area away from the detonation point has an explosion velocity of 2000 M / s, a force of 7.5 mm, a density of 1.1 g / cm3, and a thickness of 38 mm; the powdered emulsion explosive in the area between the two areas has an explosion velocity of 1900 M / s, a force of 6.5 mm, a density of 0.99 g / cm3, and a thickness of 38 mm.

[0019] Preferably, in step S2, fine sand with a thickness of 50 mm is evenly laid in advance on the ground foundation of the explosion site, and then a steel plate is laid on the fine sand.

[0020] Preferably, in step S6, the inspection of the finished product of the ultra-thick large-area nickel-based alloy composite plate includes the inspection of the bonding rate and the shear strength, and the specific qualification standards are: the bonding rate is above 99.96%, and the shear strength τb ≥ 275Mpa.

[0021] The beneficial effects of the present invention are:

[0022] The invention discloses an explosive welding method for preparing an ultra-thick large-area composite plate based on a nickel-based alloy plate, realizes the explosive bonding of the ultra-thick large-area nickel-based alloy composite plate, and the bonding rate and shear strength and other properties of the composite plate can meet the requirements of NB / T47002-2009 "explosion-welded composite plate for pressure vessel", JB / T4748-2002 "nickel and nickel-based alloy explosion-clad steel plate for pressure vessel" standard and ASME SA-265 "nickel and nickel-based alloy composite steel plate" standard. The bonding rate of the produced nickel-based alloy composite plate reaches more than 99.96%, and the shear strength τb is greater than or equal to 275Mpa. Both the mechanical properties and the corrosion resistance can meet the development needs of equipment manufacturing, chemical industry and other industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : A schematic diagram of the arrangement of the components in the explosive compounding method of the present invention;

[0024] Figure 2 : Schematic diagram of the placement of the support block in the method of the present invention.

[0025] In the figure, 1. ground foundation, 2. steel plate, 3. nickel alloy plate, 4. support block, 41. support block one, 42. support block two, 43. support block three, 5. powdered emulsion explosive, 6. detonator. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the embodiments. It should be noted that these are merely examples and illustrations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should be deemed to fall within the protection scope of the present invention.

[0027] Embodiment 1:

[0028] like Figure 1 As shown, an explosive welding method for preparing an ultra-thick large-area composite plate based on a nickel-based alloy plate comprises the following steps:

[0029] S1. Prepare the steel plate 2 and the nickel alloy plate 3 which have been polished once before the explosion.

[0030] The steel plate 2 is made of 20MnMoIV steel, with a thickness of 456 mm and a plate width of φ4300 mm. The nickel alloy plate 3 is a N04400 alloy plate, with a thickness of 8 mm and a plate width of φ4350 mm.

[0031] The surfaces of the steel plate and nickel alloy plate to be bonded are polished with a 40-mesh sand belt to remove surface oxide scale and debris.

[0032] S2. Fine sand with a thickness of 50 mm is evenly laid on the ground foundation 1 of the explosion site in advance, and then a steel plate 2 is laid on the fine sand as a substrate, and the upper end surface of the steel plate 2 is scrubbed with acetone liquid; and then a number of support blocks 4 are laid on the upper end surface of the steel plate 2 at equal intervals.

[0033] Among them, Figure 2 As shown, the support block 4 includes a support block 1 41 with a height of 14 mm, a support block 2 42 with a height of 16 mm, and a support block 3 43 with a height of 18 mm. There are several support blocks 1 41, 2 42, and 3 43. Several support blocks 1 41 are arranged on the steel plate 2 near the detonation point, several support blocks 3 43 are arranged on the steel plate 2 away from the detonation point, and several support blocks 2 42 are arranged between the support blocks 1 41 and 2 42 on the steel plate 2. This is to allow the explosion jet to be discharged better and avoid strip-shaped non-fitting.

[0034] S3. Prepare the main explosive for use. The main explosive selected is powdered emulsion explosive.

[0035] S4, scrub the lower end surface of the nickel alloy plate 3 with acetone solution, and place the nickel alloy plate 3 on a plurality of support blocks 4, and evenly apply butter on the upper end surface of the nickel alloy plate 3 with a brush to form a butter layer that acts as a buffer layer, and the butter layer thickness is 1 mm. And spread the powdered emulsion explosive 5 on the butter layer.

[0036] During the explosive composite process, the N04400 alloy plate accelerates toward the steel plate 2 under the action of the energy of the explosive and forms a certain bending angle. The N04400 alloy plate collides with the steel plate 2 and forms an atomic bond under the action of high temperature and high pressure. However, the strength of the N04400 alloy plate is relatively high, and it is difficult to form a bending angle during the explosive composite process. Therefore, it is necessary to cover the butter layer with a thickness of 38 mm of powdered emulsion explosive 5.

[0037] Among them, the powdered emulsion explosive 5 is laid in three areas, namely, the area on one side of the detonation point, the area on the side away from the detonation point, and the area between the above two areas; the powdered emulsion explosive 5 located in the area on one side of the detonation point has an explosion velocity of 1800M / s, a force of 5.5mm, a density of 0.95g / cm3, and a thickness of 38mm; the powdered emulsion explosive 5 in the area on the side away from the detonation point has an explosion velocity of 2000M / s, a force of 7.5mm, a density of 1.1g / cm3, and a thickness of 38mm; the powdered emulsion explosive 5 in the area between the above two areas has an explosion velocity of 1900M / s, a force of 6.5mm, a density of 0.99g / cm3, and a thickness of 38mm.

[0038] S5. Set a detonator 6 at one end of the powdered emulsion explosive 5 on the nickel alloy plate 3 as the detonation point, fix the detonator, and then connect the lead of the detonator to 50m away from the explosion site, which is the safe explosion distance.

[0039] S6. Spread a film on the powdered emulsion explosive 5, and then spread the pre-prepared mixed auxiliary material of sand and bran on the film.

[0040] S7, detonating the detonator 6 and the powdered emulsion explosive 5, explosively compounding the steel plate 2 and the nickel alloy plate 3, and then heat treating, leveling, repair welding and grinding of the detonation point, and after passing the test, an ultra-thick large-area nickel-based alloy composite plate product is obtained.

[0041] Based on the explosive welding method for preparing ultra-thick large-area composite plates from nickel-based alloy plates, the finished ultra-thick large-area nickel-based alloy composite plates are tested, including the bonding rate and shear strength test. The specific qualified standards are: the bonding rate is above 99.96%, and the shear strength τb ≥ 210Mpa. The finished ultra-thick large-area nickel-based alloy composite plates are tested for bonding rate and shear strength, and all meet this standard.

[0042] The invention discloses an explosive welding method for preparing an ultra-thick large-area composite plate based on a nickel-based alloy plate, realizes the explosive composite of the ultra-thick large-area nickel-based alloy composite plate, and the bonding rate and shear strength and other properties of the composite plate can meet the requirements of NB / T47002-2009 "explosion-welded composite plate for pressure vessel", JB / T4748-2002 "nickel and nickel-based alloy explosion-composite steel plate for pressure vessel" standard and ASME SA-265 "nickel and nickel-based alloy composite steel plate" standard. The bonding rate of the produced nickel-based alloy composite plate reaches more than 99.96%, and the shear strength τb is greater than or equal to 275Mpa. Both the mechanical properties and the corrosion resistance can meet the development needs of equipment manufacturing, chemical industry and other industries.

[0043] The above is an exemplary description of the invention. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates, characterized in that: The following steps are involved: S1, a steel plate (2) and a nickel alloy plate (3) which have been prepared and polished once before explosion; S2. On the ground foundation (1) at the explosion site, a steel plate (2) is laid as a base plate, and the upper end surface of the steel plate (2) is scrubbed with acetone liquid; and then a plurality of support blocks (4) are laid at equal intervals on the upper end surface of the steel plate (2); S3, prepare the main explosive for use, the selected main explosive is powdered emulsion explosive; S4, scrubbing the lower end surface of the nickel alloy plate (3) with acetone solution, and placing the nickel alloy plate (3) on a plurality of support blocks (4), and evenly applying butter on the upper end surface of the nickel alloy plate (3) with a brush to form a butter layer that acts as a buffer layer, the butter layer having a thickness of 1 mm, and spreading powdered emulsion explosive (5) on the butter layer; S5. A detonator (6) is arranged on one end of the powdered emulsion explosive (5) on the nickel alloy plate (3) as a detonation point, the detonator is fixed, and the lead of the detonator is connected to 50m away from the explosion site, which is the explosion safety distance; S6, spreading a film on the powdered emulsion explosive (5), and then spreading the pre-prepared mixed auxiliary material of sand and bran on the film; S7, detonating the detonator (6) and the powdered emulsion explosive (5), explosively compounding the steel plate (2) and the nickel alloy plate (3), and then subjecting the plate to heat treatment, leveling, repair welding and grinding of the detonation point, and after passing the test, obtaining a finished product of an ultra-thick large-area nickel-based alloy composite plate.

2. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: The steel plate (2) is made of 20MnMoIV steel, the thickness of the steel plate (2) is 456mm, and the plate width size is φ4300mm.

3. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: The nickel alloy plate (3) is a N04400 alloy plate with a thickness of 8 mm and a plate width of φ4350 mm.

4. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: In step S1, the surfaces of the steel plate and the nickel alloy plate to be bonded are polished with a 40-mesh sand belt to remove surface oxide scale and debris.

5. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: In step S2, the support block (4) includes a support block 1 (41) with a height of 14 mm, a support block 2 (42) with a height of 16 mm, and a support block 3 (43) with a height of 18 mm. A plurality of the support blocks 1 (41), 2 (42), and 3 (43) are provided. A plurality of the support blocks 1 (41) are provided on the steel plate (2) close to the detonation point, a plurality of the support blocks 3 (43) are provided on the steel plate (2) away from the detonation point, and a plurality of the support blocks 2 (42) are provided on the steel plate (2) between the support blocks 1 (41) and 2 (42).

6. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: In step S4, the powdered emulsion explosive (5) is laid in three areas, namely, an area on one side of the detonation point, an area away from the detonation point, and an area between the two areas; the powdered emulsion explosive (5) located in the area on one side of the detonation point has a detonation velocity of 1800 M / s, a force of 5.5 mm, a density of 0.95 g / cm3, and a thickness of 38 mm; the powdered emulsion explosive (5) in the area away from the detonation point has a detonation velocity of 2000 M / s, a force of 7.5 mm, a density of 1.1 g / cm3, and a thickness of 38 mm; the powdered emulsion explosive (5) in the area between the two areas has a detonation velocity of 1900 M / s, a force of 6.5 mm, a density of 0.99 g / cm3, and a thickness of 38 mm.

7. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: In step S2, fine sand with a thickness of 50 mm is evenly laid on the ground foundation (1) of the explosion site in advance, and then a steel plate (2) is laid on the fine sand.

8. The explosive welding method for preparing ultra-thick large-area composite plates based on nickel-based alloy plates according to claim 1 is characterized in that: In step S7, the finished product of the ultra-thick large-area nickel-based alloy composite plate is tested, including the bonding rate and shear strength test, and the specific qualification standards are: the bonding rate is above 99.96%, and the shear strength τb ≥ 275Mpa.

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