Structure for reducing initiation point of large-thickness explosive welding composite plate and process method thereof

Abstract

The application discloses a structure for reducing an initiation point of an explosion welding composite plate with a large thickness, which comprises a foundation, a base steel plate, a composite steel plate and explosives, the base steel plate is installed on the upper end of the foundation, the composite steel plate is installed above the base steel plate, the base steel plate and the composite steel plate are provided with a gap, the base steel plate and the composite steel plate are connected through a gap support body, and the upper end of the composite steel plate is provided with an initiation point. The initiation point composite thinning structure is in the shape of an inverted cone, an inclination angle collision is formed, and the initiation point position is locally thinned, the composite layer is thickened, and a high-energy explosive is used, so that the diameter of the non-combined area at the initiation point position is reduced from 50-80 mm to 8-15 mm, the welding quality of the area is greatly improved, and the welding quality and the combination rate of the composite layer material after explosion welding are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosive welding of dissimilar metals, and particularly relates to a structure for reducing the initiation point of explosive welding of large-thickness composite plates and a process method thereof. BACKGROUND

[0002] Composite metal plates are usually welded by explosive welding, that is, the impact force generated by the explosion of explosives is used to cause rapid collision between metal plates, so as to realize metallurgical welding of the metal plates and form a two-layer or multi-layer composite metal material of dissimilar materials. In the process of explosive welding of the composite plate, the composite layer metal is instantaneously and obliquely collided with the base layer metal material under the action of high speed, high pressure and high temperature, a metal jet is generated at the welding joint surface, and metallurgical welding is formed. However, since the composite layer moves vertically to the base layer material at the initiation point, an oblique collision cannot be formed, that is, the welding is not combined in this area. Moreover, with the increase of the thickness of the composite layer, the non-combined area after welding is larger. Due to the technical requirements of the equipment on the welding combination rate, the composite layer is usually removed after explosion for repair by fusion welding or high-energy explosive packages are used to assist initiation to reduce the non-combined area. However, when the base layer and the composite layer material cannot be fusion welded and the combination rate is required to be high, the initiation point is usually introduced. However, this will cause uneven distribution of the interface bonding strength of the whole plate, and when the plate pair is large, the quality of this method is unstable, the explosion risk is large, and the material utilization rate is low. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide a structure for reducing the initiation point of explosive welding of large-thickness composite plates. The initiation point position is locally thinned by the composite layer and high-energy explosive packages are used, so that the initiation point position of the composite layer metal material and the base layer metal material is metallurgically combined.

[0004] According to the structure for reducing the initiation point of explosive welding of large-thickness composite plates according to the embodiment of the present application, the base layer steel plate is installed on the upper end of the foundation, the composite layer steel plate is installed above the base layer steel plate, the base layer steel plate and the composite layer steel plate are provided with a gap, the base layer steel plate and the composite layer steel plate are connected through a gap support body, the upper end of the composite layer steel plate is provided with an initiation point, the composite layer steel plate is provided with an initiation point composite thinning structure having an energy-gathering effect at the initiation point position, the upper end of the initiation point composite thinning structure is uniformly covered with high-energy explosive packages, the upper end of the composite layer steel plate is uniformly covered with explosives on both sides of the high-energy explosive packages, and the high-energy explosive packages are provided with detonators inside for initiation.

[0005] Preferably, the initiation point composite thinning structure is in the shape of an inverted cone.

[0006] Preferably, the explosive is fixed outside by a charge frame, and the charge frame is fixed with the foundation by a charge frame support rod.

[0007] Preferably, the explosive is a special explosive for explosive welding, and the detonation velocity is 1800-3000 m / s.

[0008] Preferably, the process method for reducing the structure of the detonation point of the large-thickness explosive welding composite plate is as follows:

[0009] S1: Base steel plate treatment, using a grinding wheel to polish and polish, so that the bonding surface completely exposes the metal luster, the surface is smooth and flat;

[0010] S2: Forming of the detonation point composite layer thinning structure, grinding and thinning the non-bonding surface of the composite steel plate to 2-3 mm at the detonation point position, and the middle part is a flat-bottomed inverted conical detonation point composite layer thinning structure, and the grinding area is 40-80 mm;

[0011] S3: Composite steel plate treatment, using a grinding wheel to polish the bonding surface to remove the oxidation layer on the bonding surface, and the surface roughness of the composite steel plate is less than 3 mm / m;

[0012] S4: Pairing, pairing the composite steel plate and the base steel plate, and transporting to the explosion operation point;

[0013] S5: Explosive composite, placing the base steel plate horizontally on the foundation, placing a gap support body on the bonding surface of the base steel plate, placing the composite steel plate parallel on the gap support body, fixing the charge frame on the composite steel plate, inserting the charge frame support rod around the charge frame, placing the high-energy explosive package on the upper end of the detonation point composite layer thinning structure, placing the explosive in the charge frame, and detonating after personnel retreat from the safety zone;

[0014] S6: Repair of the detonation point, after explosive composite, repairing the detonation point composite layer thinning structure by wire filling, and mechanically grinding after welding to make the detonation point composite layer thinning structure flush with the adjacent base material;

[0015] S7: Heat treatment, heat treatment is performed on the product after explosion to eliminate the stress generated during explosion;

[0016] S8: Ultrasonic flaw detection of the composite steel plate.

[0017] In the present application, by forming an angle collision through the inverse conical shape of the detonation point composite thinning structure, the problem that when the thickness of the explosion welding composite layer of the colored refractory metal is large, the area of the uncombined region at the detonation point position is large and the combination rate cannot meet the technical requirements is overcome, and the welding quality and the combination rate of the composite layer material after explosion welding are improved by using the method of locally thinning the composite layer at the detonation point position and adding a high-energy explosive package, so that the welding quality of the composite layer at the detonation point position is greatly improved, and the effect is more obvious as the thickness of the composite layer increases. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0019] Figure 1 A structure diagram of a structure for reducing the detonation point of a large-thickness explosion welding composite plate is provided.

[0020] In the figure: 1-ground, 2-base steel plate, 3-composite steel plate, 4-explosive, 5-clearance support, 6-detonation point composite thinning structure, 7-explosive frame, 8-high-energy explosive package, 9-detonator, 10-explosive frame support rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below by combining the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0022] Examples of the described embodiments are shown in the drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation on the present application.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless explicitly specified and limited otherwise.

[0025] In the present application, unless explicitly specified and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Referring to Figure 1 , including foundation 1, base steel plate 2, composite steel plate 3, explosive 4, base steel plate 2 is installed on the upper end of foundation 1, composite steel plate 3 is installed above base steel plate 2, base steel plate 2 and composite steel plate 3 are provided with gap, base steel plate 2 and composite steel plate 3 are connected through gap support 5, the upper end of composite steel plate 3 is provided with initiation point, composite steel plate 3 is provided with initiation point composite thinning structure 6 with energy gathering effect at the position of initiation point, the upper end of initiation point composite thinning structure 6 is uniformly covered with high-energy explosive package 8, the upper end of composite steel plate 3 is uniformly covered with explosive 4 on both sides of high-energy explosive package 8, high-energy explosive package 8 is internally provided with detonator 9 for detonation; initiation point composite thinning structure 6 is in the shape of inverted cone or approximately inverted cone, explosive 4 is fixed outside through explosive frame 7, explosive frame 7 is fixed with foundation 1 through explosive frame support rod 10; explosive 4 adopts explosive special for explosive welding, and the detonation velocity is 1800-3000 m / s.

[0027] Example 1:

[0028] TA2+Q235B 8mm+52mm*2000mm*3850mm-2piece finished product (1#, 2#)

[0029] 8mm+52mm*350mm*350mm-2piece test plate (3#, 4#)

[0030] Note: 1#, 3# plate adopts conventional process, 2#, 4# adopts the method and process operation of the present application.

[0031] Base steel plate 2 treatment: polishing is performed using a grinding wheel to expose the metal luster completely on the fitting surface, and the surface is smooth and flat;

[0032] Explosive point complex layer thinning structure 6 forming: according to the process design requirements, the explosive point position of 2#, 4# complex layer non-bonding surface is set to be 2-3mm by using metal grinding head or mechanical method grinding and thinning, and is in the shape of flat bottom inverted cone or near visual shape, and the grinding area is about 40-80mm;

[0033] Complex layer steel plate 3 treatment: the unevenness of the complex layer plate surface is less than 3mm / m; the bonding surface is polished using a chisel wheel or a grinding wheel, and the oxidation layer of the bonding surface is removed, and the surface is smooth;

[0034] Matching: the complex layer steel plate and the base layer steel plate 2 are matched, and the explosive operation point is operated;

[0035] Explosive compounding: the base layer steel plate 2 is horizontally placed on the gun platform (foundation), the gap support body 5 is placed on the base layer steel plate 2 to be bonded, the complex layer steel plate 4 is placed parallel thereon, the explosive limiting frame is fixed on the complex layer steel plate 4, the explosive limiting frame support rod 10 is inserted around the explosive limiting frame 7, the high-energy auxiliary explosive package is made, the explosive package is placed at the process design explosive point position (the complex layer pre-grinding and thinning position), the explosive is placed in the explosive limiting frame 7, and the personnel are evacuated from the safety zone and then exploded;

[0036] Explosive point repair: after explosive compounding, the complex layer thinning position of 2#, 4# plate explosive point is directly repaired by using TA2 welding wire for filling by argon arc welding, and the mechanical grinding is made to be flush with the adjacent base material after welding;

[0037] Heat treatment: the product after explosion is subjected to heat treatment to eliminate the stress generated during explosion;

[0038] The complex layer steel plate 3 is subjected to 100% UT ultrasonic flaw detection, the non-bonding area of 1#, 3# plate explosive point position is Φ60-Φ80mm, and the ultrasonic display of 2#, 4# plate explosive point position non-bonding area is less than Φ20mm;

[0039] Interface forming: the complex layer of 3#, 4# plate is completely stripped, the interface wave forming and distribution are observed and measured, the Φ60-Φ70mm of 3# plate explosive point position non-wave area is stripped, and the Φ8-Φ13mm of 4# plate explosive point non-wave area is stripped;

[0040] Subsequent treatment: the 1#, 3# complex layer steel plate is subjected to leveling, non-destructive testing, cutting, mechanical property testing, surface mechanical polishing treatment, and finished product packaging.

[0041] In summary, the structure of the reduced thickness explosive welding composite plate ignition point is inverted conical through the composite thinning structure of the ignition point, forming an inclined angle collision, which overcomes the problem that when the thickness of the clad layer of the non-ferrous refractory metal explosive welding is large, the area of the uncombined region at the ignition point position is large, and the bonding rate cannot meet the technical requirements. By using the method of locally thinning the clad layer at the ignition point position and adding high-energy explosive, the uncombined area at the ignition point position is increased from Φ50-Φ80mm, and the welding quality of the area is greatly improved. The welding quality and bonding rate of the clad layer material after explosive welding are improved, and the method is simple to operate, high in processing efficiency and low in cost. The welding quality of the ignition point is greatly improved, and the effect is more obvious as the thickness of the clad layer increases.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A process for reducing the detonation point of a thick, explosively welded composite plate, characterized in that, The system includes a foundation, a base steel plate, a cladding steel plate, and explosives. The base steel plate is installed on top of the foundation, and the cladding steel plate is installed above the base steel plate. A gap is provided between the base steel plate and the cladding steel plate, and they are connected by a gap support. A detonation point is provided at the upper end of the cladding steel plate. A composite thinning structure for accumulating energy is provided at the detonation point location on the cladding steel plate. A high-energy explosive charge is uniformly covered on the upper end of the composite thinning structure. Explosives are uniformly covered on both sides of the high-energy explosive charge at the upper end of the cladding steel plate. A detonator for detonation is provided inside the high-energy explosive charge. The explosive is fixed to the outside by an explosive frame, and the explosive frame is fixed to the foundation by an explosive frame support rod; The process steps are as follows: S1: The base steel plate is treated by grinding and polishing with a grinding wheel to fully expose the metallic luster of the bonding surface, making the surface smooth and flat; S2: Detonation point multilayer thinning structure forming, the detonation point position of the non-bonding surface of the multilayer steel plate is ground and thinned to 2-3mm, and the middle part is a detonation point multilayer thinning structure with a flat bottom and an inverted cone shape, with a grinding area of ​​40-80mm; S3: The composite steel plate is treated by polishing the mating surfaces with a flap wheel or abrasive wheel to remove the oxide layer on the mating surfaces. The unevenness of the composite steel plate surface is less than 3mm / m. S4: Pairing, the cladding steel plate and the base steel plate are paired and transported to the blasting operation site; S5: Explosive composite, place the base steel plate horizontally on the foundation, place the gap support on the surface of the base steel plate to be bonded, place the cladding steel plate parallel on it, fix the explosive frame on the cladding steel plate, insert explosive frame support rods around the explosive frame, place the high-energy explosive charge on the upper end of the cladding thinning structure at the detonation point, place the explosive in the explosive frame, and detonate after personnel have evacuated to a safe area. S6: Detonation point repair. After the explosion and composite, the detonation point multilayer thinning structure is repaired with filler wire, and mechanically ground after welding to make the detonation point multilayer thinning structure flush with the adjacent base material. S7: Heat treatment, which involves heat-treating the product after the explosion to eliminate the stress generated during the explosion; S8: Ultrasonic testing is performed on the clad steel plate.

2. The process for reducing the detonation point of a thick, explosively welded composite plate according to claim 1, characterized in that: The explosive used is a special explosive for explosive welding, with a detonation velocity of 1800-3000 m / s.

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