CN113927147A - A rapid welding rings connects for field rescue - Google Patents
A rapid welding rings connects for field rescue Download PDFInfo
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- CN113927147A CN113927147A CN202111085915.3A CN202111085915A CN113927147A CN 113927147 A CN113927147 A CN 113927147A CN 202111085915 A CN202111085915 A CN 202111085915A CN 113927147 A CN113927147 A CN 113927147A
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- bottom plate
- radius
- sleeve
- connecting rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
- B23K20/08—Explosive welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
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- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a quick welding joint for field rescue, belonging to the technical field of structural connection, wherein the quick welding lifting ring joint comprises a bottom plate and a lifting ring connected above the center of the bottom plate; the upper surface of the bottom plate is uniformly paved with explosives; positioning devices are arranged at the four corners of the bottom plate; the positioning device is connected with the object to be rescued. The device can be used for rescuing by quickly increasing the force application point under the condition that the device needs to be lifted in the field without a proper tool or an electric/gas source and under the condition that a lifting ring connector needs to be quickly connected for lifting.
Description
Technical Field
The invention belongs to the technical field of structural connection, and particularly relates to a quick welding joint for field rescue.
Background
When the emergency rescue and salvage work is carried out in sudden natural disasters such as earthquake, marine perils and the like, the rescue and salvage work is often required to be carried out, in the field rescue process, the towing or hoisting operation is sometimes required, and the rescue work is carried out by finding a proper acting point on a large-scale structure; when rescue tools such as cranes are required for rescue, salvage and the like, the difficulty of rescue and salvage is greatly increased due to the fact that no proper acting point exists. It is often difficult to find a suitable point of application, requiring the installation of a joint or point of suspension on the object being towed (hoisted). The conventional method for installing the joints or the hanging points adopts mechanical connection or welding, and the mechanical connection method needs an electric (gas) source and a tool; common welding methods are electric welding and (acetylene) gas welding, which also require a power or gas source. In outdoor rescue conditions, it is very difficult to install joints or hanging points on large structures without a power source or air source.
Disclosure of Invention
The invention discloses a quick welding lifting ring connector for field rescue, aiming at the problems in the prior art, and the quick welding lifting ring connector can be used for solving the quick installation problem of the best acting point when a large member is lifted or dragged under the condition of no power supply or air source aiming at field rescue and salvage operation.
The invention is realized by the following steps:
the invention relates to a quick welding lifting ring joint for field rescue, which comprises a bottom plate and a lifting ring connected above the center of the bottom plate; the upper surface of the bottom plate is uniformly paved with explosives; positioning devices are arranged at the four corners of the bottom plate; the positioning device is connected with the object to be rescued;
the positioning device comprises a sleeve, a connecting rod, a sucker, a boss, a cross-shaped support frame, a weak link and a nut;
the sleeve is fixedly sleeved above the connecting rod through a nut, and the cross-shaped support frame is fixed at the middle lower part of the connecting rod to ensure that the connecting rod does not generate transverse displacement; bosses are arranged on two sides of the cross-shaped support frame, the weak link is positioned above the bosses, and the bosses are connected with the surface of the floor, so that the sleeve is convenient to mount and dismount.
The sucker is connected to the bottom of the connecting rod and is used for being adsorbed to the surface of the connected metal, so that explosive welding is more accurate; the purpose of the links is to determine the relative positions of the parts of the positioning device. The suction force of the sucker can prevent the bottom plate from sliding transversely; the sleeve is connected to the bottom plate through a threaded hole in the cylindrical table, and a weak link is arranged on the sleeve and has the function of breaking the weak link due to shock waves generated by explosive explosion, so that the connection is smooth; the cross-shaped support frame is used for keeping the position of the center of the connecting rod and the position of the sucker from changing, so that the connection is more accurate. The radius of the sucker is determined by calculating the adsorption force which can be provided by the sucker and comparing the adsorption force with the weight of the lifting ring connector, so that the inner diameter of the sleeve is larger than the radius of the sucker, and the sucker can be contained in the sleeve when connection occurs; the cross section area of the connecting rod is larger than that of the weak link, so that the weak link is easier to break, and the connection is smoothly carried out.
The supporting device is used for preventing the impact force from being too large to cause structural damage to the connected objects when explosive welding occurs, or the connected objects cannot provide enough supporting counter force to connect the joint, so a rigid supporting device is needed for supporting. The support means are generally placed on the inner surface of the connected object and the support rods are suitably mounted so that the forces generated on the surface by the explosive welding are suitably transmitted to the connected object.
Further, the inner diameter of the sleeve is larger than the radius of the sucker.
Furthermore, the cross-sectional area of the connecting rod is larger than that of the weak link.
Furthermore, the inner surface of the object to be rescued can be provided with a supporting device, and the supporting device enables the force generated on the surface by explosive welding to be reasonably transmitted to the connected object.
Furthermore, the bottom plate is made of steel materials.
Furthermore, four corners of the bottom plate are provided with protruding cylindrical platforms or digging holes; the positioning device is connected with the bottom plate through a threaded hole on the cylindrical table which is provided with a protrusion; if the positions of the explosive on the bottom plate except the dug holes can be fully distributed, the holes are directly dug at the four corners of the bottom plate; the positioning device is adsorbed on the surface of the object to be rescued by utilizing the sucking disc.
Furthermore, the hoisting weight of the quick welding hoisting ring joint is 10t, and the sectional area of the selected hoisting ring is larger than 732mm2The radius of the sucker is larger than 10mm, the length of the bottom plate is 200mm, the width of the bottom plate is 200mm, the thickness of the bottom plate is 8mm, and the radius of the cylindrical table arranged at the four corners is 20 mm.
Further, the bottom plate adopts steel material, and the explosive piece should conveniently carry and safety, and should evenly spread on the bottom plate surface to utilize remote control unit to detonate. When one end of the explosive is ignited, detonation waves propagating along the surface of the bottom plate can be generated. This detonation wave causes the base plate to strike the object being welded and at the point of impact the oxide film on the metal surface will melt and the two metals will then weld together. Explosives used for explosive welding are mostly ammonium salts (mixture of ammonium nitrate and sodium chloride) and ammonium oils (mixture of ammonium nitrate and diesel oil). Because the objects to be rescued are generally made of low-carbon steel, aluminum alloy and other materials, and steel materials and most metal materials (low-carbon steel, medium-carbon steel, alloy steel, stainless steel, titanium-copper-aluminum alloy and the like) can have high bonding performance, the bottom plate of the rapid welding connection flying ring joint is made of steel materials.
Drilling a hole with the radius of 15mm at the center of the cylindrical table, and connecting a sleeve in the positioning device to the hole through threads; laying explosives on the bottom plate; the middle part of the bottom plate is connected with a circular ring, so that the hoisting work can be implemented, the inner radius of the circular ring is 20mm, the outer radius is 35mm, and the width of the circular ring is 25mm, so that the part of the circular ring connected with the bottom plate is larger than the minimum cross section area, namely the length of a cross section rectangle is larger than 30mm, the radius of the inner space of the sleeve is 11mm, the wall thickness is 4mm, the distance between the upper surface of the sleeve and the bottom of the bottom plate is 35mm, and the thickness of a weak link is 0.2 mm; the height of the boss is 4mm, and the width between the boss and the outer wall of the sleeve is 5 mm.
Furthermore, the radius of the cross section area of the connecting rod is set to be 4mm, a hole with the radius of 4mm is drilled at the top of the sleeve, the purpose is to pass through the connecting rod with the same radius of 4mm, the bottom of the connecting rod is accompanied with a sucker, and the radius of the sucker is 10 mm.
The beneficial effects of the invention and the prior art are as follows:
the invention is based on the explosive welding technology, utilizes the impact force and high temperature generated by explosive explosion to enable the oxide film on the contact surface of the weldment and the object to be welded to enter plasticity and be extruded out, so that the weldment and the object to be welded are welded together, and the welding between different metals can be realized. The invention provides a quick welding joint used in a field rescue process, which aims to solve the problem of quick installation of an optimal acting point when a large member is hoisted without a power supply or an air source. The quick welding joint is convenient to carry and use, not only has a stable structure, but also does not occupy much space, is convenient to carry, and is safe and simple to use.
The quick welding joint is used for field emergency rescue, salvage and other operations, and can be quickly installed on a large member when the large member is hoisted or dragged without a proper acting point. The quick welding joint of the invention consists of a hanging joint, a tablet, a positioning device and a supporting device. And selecting an optimal force application point position, fixing the hanging joint at the optimal force application point position through a positioning device, placing explosive tablets on a bottom plate of the hanging joint, introducing the explosive tablets, and welding the hanging joint to a large member. If the stiffness of the structure (against deformation caused by explosive blast shock) at the optimal force application point is not sufficient, support means are required to increase the resistance to shock loads.
Drawings
FIG. 1 is an overall schematic view of a quick weld eye joint for field rescue of the present invention;
FIG. 2 is an enlarged view of a positioning device for a quick weld bail joint for field rescue of the present invention;
FIG. 3 is a top view of a base plate of a quick weld eye joint for field rescue of the present invention;
the device comprises a lifting ring 1, an explosive 2, a positioning device 3, a rescued object 4, a bottom plate 5, a sleeve 6, a connecting rod 7, a sucker 8, a boss 9, a cross-shaped support frame 10, a weak link 11, a nut 12 and a cylindrical table 13.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 3, the quick welding suspension ring joint comprises a bottom plate 5 and a suspension ring 1 connected above the center of the bottom plate 5; the upper surface of the bottom plate 5 is uniformly paved with explosives 2; the four corners of the bottom plate 5 are provided with positioning devices 3; the positioning device 3 is connected with the object 4 to be rescued; the positioning device 3 comprises a sleeve 6, a connecting rod 7, a sucker 8, a boss 9, a cross-shaped support frame, a bolt 10, a weak link 11 and a nut 12. Four corners of the bottom plate 5 are provided with protruding cylindrical platforms 13 or dug holes; the positioning device is connected with the bottom plate through a threaded hole on the cylindrical table which is provided with a protrusion; if the explosive is arranged on the bottom plate 5, holes are directly dug at four corners of the bottom plate 5; the positioning device utilizes the suction cup 8 to be adsorbed on the surface of the object 4 to be rescued
When the lifting ring needs to be used, firstly, a sleeve 6, a connecting rod 7, a sucking disc 8, a boss 9, a cross-shaped support frame, a bolt 10, a weak link 11 and a nut 12 which are included in a positioning device 3 are assembled, and are connected with a bottom plate 5 connected with the lifting ring 1 through the sleeve, namely the sleeve is connected with a threaded hole of a cylindrical table of the bottom plate; the suction cup 8 in the positioning device 3 is connected to the surface of the object to be rescued, i.e. to the object 4 to be rescued. If the object to be connected is thin and is easily deformed by impact, a support device needs to be provided in the object 4 to be rescued. The explosive 2 is flatly laid on the bottom plate 5, and the remote control is utilized to detonate the explosive, so that the bomb can be detonated, and the quick welding flying ring joint is connected. The joint is designed according to different hoisting weights.
The quick welding eye joint of the present invention is illustrated by the following specific data, examples:
the embodiment will give a detailed description on the design of parameters of each part for the requirement that the lifting weight is 10t and the safety factor is designed to be 3. The device is made of steel material, the tensile strength of the steel is 410Mpa, so the minimum sectional area of the selected hanging ring 1 can not be less than 732mm2. The total weight of the device is estimated to be about 3kg, and the atmospheric pressure on the four suction cups 8 is satisfied in order to keep the device from falling down when hanging upside downGreater than the total weight of the quick welding suspension ring joint. The atmospheric pressure is 0.1MPa, and the useful pressure acting on the sucker is 0.3 MPa, so that the radius of the sucker is not less than 10mm by calculation to ensure sufficient safety.
The base plate 5 is 200mm long, 200mm wide and 8mm thick, cylindrical bosses 13 with 20mm radius are arranged at four corners, the circle center of the cylindrical boss coincides with the vertex of the square, and the height of the cylindrical boss is consistent with the height of the base plate. The bottom plate is made of steel, a hole with the radius of 15mm is drilled at the center of the cylindrical table, and a sleeve in the positioning device is connected into the hole through threads. The explosive 2 with moderate thickness is spread on the bottom plate. The middle part of the bottom plate 5 is connected with a circular ring, so that the hoisting work can be implemented, the inner radius of the circular ring is 20mm, the outer radius of the circular ring is 35mm, and the width of the circular ring is 25 mm. The section of the ring connecting to the base plate is therefore larger than the smallest cross-sectional area, i.e. the length of the cross-sectional rectangle is larger than 30 mm. This gives a ring volume of about 64795mm3The total volume of the bottom plate is 327540mm3And the density of the steel is 7.85g/cm3Thus, a total mass of 3.0798kg of the ring plus the sole plate is obtained. The radius of the sucker can determine the information such as the inner radius, the wall thickness and the like of the sleeve.
The positioning device 3 is connected at the four corners of the bottom plate 5 through threaded holes. Wherein the part with the weak link 11 is broken during explosive welding, so that the welding can be smoothly carried out. The radius of the internal space of the sleeve is 11mm, the wall thickness is 4mm, the distance between the upper surface of the sleeve and the bottom of the bottom plate is 35mm, and the thickness of the weak link is 0.2mm (in a static state, the sleeve can bear 2t load). A structure 9 similar to a boss is arranged at the joint of the sleeve and the surface of the bottom plate, so that the sleeve is convenient to assemble and disassemble, the height of the sleeve is 4mm, and the width between the sleeve and the outer wall of the sleeve is 5 mm. A weak link is formed above the boss. Because the weak link is broken when explosive welding occurs, the cross section area of the connecting rod for supporting is larger than that of the weak link, and the radius of the cross section area of the connecting rod is set to be 4mm through calculation. The top of the sleeve is drilled with a hole with the radius of 4mm, the purpose is to pass through a connecting rod 7 with the same radius of 4mm, the bottom of the connecting rod is accompanied with a sucker 8, the radius of the sucker is 10mm, the sucker can be conveniently fixed with an object to be welded, and the purpose is to ensure that the radius of the sucker is smaller than the inner diameter of the sleeve after explosion happens, so that the sucker can smoothly enter the sleeve. Two M8 nuts are used to fix the sleeve and the connecting rod at the top end of the sleeve and adjust the relative position to keep the height between the bottom plate and the connected object at about 6mm and keep it from moving transversely. The cross-shaped support frame is used for keeping the position of the center of the connecting rod and the position of the sucker from changing, so that the connection is more accurate. After explosion welding, the bottom of the bottom plate is combined with the object to be rescued into a whole, and the bottom is well welded.
If a supporting device is provided, the supporting device is composed of a foundation plate, a supporting rod and the like. For the case of explosive welding connections, for example when the surface of the object to be rescued is thick and meets the requirement of explosive welding, the support device can be omitted. If the surface is not thick enough or is very flexible, support means may be added. However, according to the principle of explosive welding, it can be known that the supporting device as the base must be installed inside the connected object, so the method of the present invention is not suitable for the case where the surface is not suitable for the connected object and the supporting device is not suitable for installation.
The explosive is determined on a case-by-case basis. For the assumed condition (the lifting weight is 10t, the safety factor is designed to be 3), the explosive can be selected to be rock ammonium nitrate explosive, and the density of the explosive is 0.4-0.5g/cm 3. In order to make the explosion smoothly proceed, a catalyst should be added, wherein the explosive proportion is between 80% and 90%, the catalyst proportion is between 10% and 20%, the explosive welding speed is controlled between 2000 and 3000m/s, and the SE type explosive special for explosive welding is obtained by using the rock ammonium nitrate explosive as a main body and adding a certain proportion of salt and expanded perlite. The thickness of the explosive is generally about 20 mm. The explosive should be made into a portable type, can be designed into explosive tablets, and can be adhered to the bottom plate when in use. The igniter is connected to the inside of the explosive tablet and is ignited by a remote control device when in use.
When the device is reasonably arranged on the surface of an object to be connected, the explosive can be ignited for connection, and the rescue purpose is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (8)
1. A quick welding lifting ring joint for field rescue is characterized by comprising a bottom plate (5) and a lifting ring (1) connected above the center of the bottom plate (5); the upper surface of the bottom plate (5) is uniformly paved with explosives (2); the four corners of the bottom plate (5) are provided with positioning devices (3); the positioning device (3) is connected with the object (4) to be rescued;
the positioning device (3) comprises a sleeve (6), a connecting rod (7), a sucker (8), a boss (9), a cross-shaped support frame (10), a weak link (11) and a nut (12);
the sleeve (6) is fixedly sleeved above the connecting rod (7) through a nut (12), the sucker (8) is arranged at the bottom of the connecting rod (7), and the cross-shaped support frame (10) is fixed at the middle lower part of the connecting rod (7) to ensure that the connecting rod (7) does not generate transverse displacement; bosses (9) are arranged on two sides of the cross-shaped support frame (10), the weak link (11) is positioned above the bosses (9), and the bosses (9) are connected with the surface of the floor, so that the sleeve is convenient to mount and dismount.
2. A quick welding flying ring joint for field rescue according to claim 1, characterized in that the inner diameter of the sleeve (6) is larger than the radius of the suction cup (8).
3. A quick welded flying ring joint for field rescue according to claim 1 wherein the cross-sectional area of the connecting rod (7) is greater than the cross-sectional area of the weak link (11).
4. A quick welding flying ring joint for field rescue according to claim 1 characterized in that the inner surface of the object (4) to be rescued is also provided with support means that allow the forces generated by explosion welding on the surface to be transmitted reasonably to the object to be connected.
5. A quick welding lifting ring joint for field rescue according to claim 4 characterized in that the four corners of the bottom plate (5) are provided with protruding cylindrical platforms (13) or dug holes; the positioning device is connected with the bottom plate through a threaded hole on the cylindrical table which is provided with a protrusion; if the positions of the explosive on the bottom plate (5) except the dug holes can be fully distributed, the holes are directly dug at the four corners of the bottom plate (5); the positioning device is adsorbed on the surface of the object (4) to be rescued by utilizing a sucking disc (8).
6. A quick welding lifting ring joint for field rescue according to claim 5, characterized in that the quick welding lifting ring joint has a lifting weight of 10t, and the cross section area of the selected lifting ring (1) is more than 732mm2The radius of the sucker is larger than 10mm, the length of the bottom plate (5) is 200mm, the width of the bottom plate is 200mm, the thickness of the bottom plate is 8mm, and the radius of the cylindrical table (13) arranged at the four corners of the bottom plate is 20 mm.
7. The quick-welding lifting ring joint for field rescue according to claim 5, characterized in that the bottom plate is made of steel, a hole with the radius of 15mm is drilled at the center of the cylindrical table (13), and a sleeve in the positioning device is connected into the hole through threads; laying explosives (2) on the bottom plate; the middle part of the bottom plate (5) is connected with a circular ring, so that the hoisting work can be implemented, the inner radius of the circular ring is 20mm, the outer radius of the circular ring is 35mm, and the width of the circular ring is 25mm, so that the part of the circular ring connected with the bottom plate is larger than the smallest cross section area, namely the length of a cross section rectangle is larger than 30mm, the radius of the inner space of the sleeve is 11mm, the wall thickness is 4mm, the distance between the upper surface of the sleeve and the bottom of the bottom plate is 35mm, and the thickness of a weak link is 0.2 mm; the height of the boss (9) is 4mm, and the width between the boss and the outer wall of the sleeve is 5 mm.
8. A quick welding flying ring joint for field rescue according to claim 1 characterized in that the connecting rod cross section area is set to 4mm radius, a hole with 4mm radius is drilled at the top of the sleeve for the purpose of passing through the same 4mm radius connecting rod (7), which is accompanied by a suction cup (8) at the bottom of the connecting rod, the radius of which is 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111085915.3A CN113927147B (en) | 2021-09-16 | 2021-09-16 | A fast welding rings connect for field rescue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111085915.3A CN113927147B (en) | 2021-09-16 | 2021-09-16 | A fast welding rings connect for field rescue |
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| CN113927147A true CN113927147A (en) | 2022-01-14 |
| CN113927147B CN113927147B (en) | 2022-06-28 |
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| CN202111085915.3A Active CN113927147B (en) | 2021-09-16 | 2021-09-16 | A fast welding rings connect for field rescue |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1470379A (en) * | 1974-11-18 | 1977-04-14 | Int Research & Dev Co Ltd | Explosive joining of tubular members |
| US5370298A (en) * | 1993-09-22 | 1994-12-06 | International Technologies A/S | Method for explosion welding of joints and an apparatus for joining two pipes by means of explosion welding |
| CN108466917A (en) * | 2018-05-28 | 2018-08-31 | 重庆顺安盛钛科技新材料有限公司 | A kind of explosion welding compound plate boom hoisting |
| CN207888055U (en) * | 2018-01-30 | 2018-09-21 | 郑州宇光复合材料有限公司 | A kind of fine silver-carbon steel composite bimetal pipe plate explosive welding structure |
| CN210026534U (en) * | 2019-04-10 | 2020-02-07 | 南京昭邦金属复合材料有限公司 | Titanium copper explosion composite board structure |
| CN210413029U (en) * | 2019-08-14 | 2020-04-28 | 南京首勤特种材料有限公司 | Titanium steel composite sheet explosive welding device |
| CN111922502A (en) * | 2020-08-10 | 2020-11-13 | 湖北金兰特种金属材料有限公司 | Structure for reducing explosion point of large-thickness explosion welding composite board and process method thereof |
| CN113385791A (en) * | 2021-07-08 | 2021-09-14 | 北京石油化工学院 | Underwater emergency rescue system and underwater rescue method based on same |
-
2021
- 2021-09-16 CN CN202111085915.3A patent/CN113927147B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1470379A (en) * | 1974-11-18 | 1977-04-14 | Int Research & Dev Co Ltd | Explosive joining of tubular members |
| US5370298A (en) * | 1993-09-22 | 1994-12-06 | International Technologies A/S | Method for explosion welding of joints and an apparatus for joining two pipes by means of explosion welding |
| CN207888055U (en) * | 2018-01-30 | 2018-09-21 | 郑州宇光复合材料有限公司 | A kind of fine silver-carbon steel composite bimetal pipe plate explosive welding structure |
| CN108466917A (en) * | 2018-05-28 | 2018-08-31 | 重庆顺安盛钛科技新材料有限公司 | A kind of explosion welding compound plate boom hoisting |
| CN210026534U (en) * | 2019-04-10 | 2020-02-07 | 南京昭邦金属复合材料有限公司 | Titanium copper explosion composite board structure |
| CN210413029U (en) * | 2019-08-14 | 2020-04-28 | 南京首勤特种材料有限公司 | Titanium steel composite sheet explosive welding device |
| CN111922502A (en) * | 2020-08-10 | 2020-11-13 | 湖北金兰特种金属材料有限公司 | Structure for reducing explosion point of large-thickness explosion welding composite board and process method thereof |
| CN113385791A (en) * | 2021-07-08 | 2021-09-14 | 北京石油化工学院 | Underwater emergency rescue system and underwater rescue method based on same |
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| CN113927147B (en) | 2022-06-28 |
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