CN112139658A - Portable passive welding bomb and using method thereof - Google Patents
Portable passive welding bomb and using method thereof Download PDFInfo
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- CN112139658A CN112139658A CN201910574612.4A CN201910574612A CN112139658A CN 112139658 A CN112139658 A CN 112139658A CN 201910574612 A CN201910574612 A CN 201910574612A CN 112139658 A CN112139658 A CN 112139658A
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Images
Classifications
-
- 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
- B23K23/00—Alumino-thermic welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a portable passive welding bomb and a using method thereof, belonging to the technical field of welding equipment, and comprising an outer bomb barrel with an opening at the bottom, an inner bomb barrel, welding materials, an ignition sheet, a nozzle and a sealing sheet; the inner cartridge is placed inside the outer cartridge; the welding material is filled in the inner cylinder; after the welding material in the inner cartridge is filled to a certain thickness, an ignition sheet is placed; a nozzle is arranged on the ignition sheet; the sealing piece is placed on one side of the opening of the outer cartridge, and the outer cartridge and the inner cartridge are sealed. The high-temperature molten metal and high-pressure gas generated by burning the welding material are sprayed out after being subjected to energy gathering and compression through the nozzle, and the spray jet has high temperature, high energy density and low heat loss, and has the characteristics of large thickness of the welding metal, high efficiency, wide application range, good use, storage and transportation safety and the like. Meanwhile, the welding bullet is suitable for manual operation, does not need an external power supply or an external air source, and is convenient to carry, simple to operate, safe and reliable.
Description
Technical Field
The invention relates to the technical field of welding equipment, in particular to a portable passive welding bomb and a using method thereof.
Background
The emergency welding is an important technology for emergency installation and emergency repair of field engineering equipment, and is also an essential technology in army battlefield emergency repair. Statistics shows that the equipment parts are broken, perforated, broken and the like in the field or battlefield, the service performance is influenced, and most of the equipment parts need to be quickly solved by adopting an emergency welding method. In disaster rescue such as earthquake, snow disaster, collapse, sunken ship and the like, a portable, safe and efficient emergency welding method is also urgently needed.
Currently, the commonly used thermal welding method in field repairs is active welding. Active welding (conventional welding techniques such as manual arc welding, gas welding, plasma welding, etc.) requires heavy equipment and energy sources such as gas source power supplies, and requires professional operation.
With the development of science and technology, passive welding has been researched, compared with active welding, heavy equipment and an air source power source are abandoned, and the passive welding is convenient to use. In the prior art, passive welding is a manual self-propagating welding method which is developed and researched by utilizing a combustion synthesis technology and based on the technical achievement of manual self-propagating welding, and is a novel field emergency welding method without external energy and equipment, a welding device used in the method is a combustion type welding pen (rod) suitable for manual operation, and the structure of the welding pen (rod) is shown in figure 1. The specific using operation steps are as follows: the sleeve pipe of cover outside welding pen (stick) is taken off, insert sleeve pipe opening one end on the end cap of welding pen (stick), handheld sleeve pipe, aim at the position by the weld metal with welding pen (stick), light the cap of igniting with the lighter, treat that welding pen (stick) begin the burning and produce high temperature molten metal, press close to by the weld metal with welding pen (stick), remove welding pen (stick), welding pen (stick) produce the molten high temperature metal and can weld the metal, welding thickness is about 5 mm.
Although the welding pen (rod) can weld metal under the conditions of no power supply, no gas source and no equipment, the problems of low metal welding efficiency, thin thickness (only about 5 mm), poor welding seam quality and the like are caused by low temperature, low speed, low energy density, large heat loss and the like generated by combustion of the welding pen (rod).
Disclosure of Invention
In view of the above, the present invention provides a portable passive welding bomb and a method for using the same, which can generate high temperature metallurgical melt and high pressure gas, and can locally melt metal components and realize welding.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a portable passive welding bullet which comprises an outer bullet barrel with an opening at the bottom, an inner bullet barrel, welding materials, a firing sheet, a nozzle and a sealing sheet, wherein the welding materials are arranged on the outer bullet barrel; the inner cartridge is placed inside the outer cartridge; the welding material is filled in the inner cylinder; after the welding material in the inner cartridge is filled to a certain thickness, an ignition sheet is placed; a nozzle is arranged on the ignition sheet; the sealing piece is placed on one side of the opening of the outer cylinder.
Preferably, the material of the inner cylinder is combustible paper material.
Preferably, the outer cylinder is made of metal.
Preferably, the distance between the outer wall of the inner barrel and the inner wall of the outer barrel is (0,0.2] mm.
Preferably, the compacted density of the welding material is more than 1.86-3.5 g/cm3。
Preferably, the welding material comprises a welding agent and an additive; the welding agent is pressed into a solid cylinder and is mixed in the additive.
Preferably, the diameter of the solid cylinder is 1/5-1/3 of the inner diameter of the inner barrel.
Preferably, the solder comprises an oxidizing agent and an Al reducing agent; the oxidant comprises CuO and Fe2O3、Fe3O4、MnO2、Cr2O3、TiO2And NiO; the welding agent accounts for 70-80% of the welding material by mass.
Preferably, the additives include slag formers, diluents and alloying agents; the slagging agent is CaF2、CaCO3、B2O3One or more of MnFe and SiFe, wherein the slag former accounts for 6-10% of the welding material by mass percent; the diluent comprises Al2O3And/or SiO2The diluent accounts for 4-10% of the welding material by mass; the alloying agent comprises Fe, Ni, Ag, Ti or rare earth materials, and accounts for 5-10% of the welding material by mass.
The invention also provides a use method of the portable passive welding bomb, which comprises the following steps:
the portable passive welding bomb is placed in a welding device, the welding device is held by hand to align with a welding piece, a sealing sheet of the portable passive welding bomb is broken through a fuse, a fuse ignition sheet is ignited, an inner bomb is pushed through an opening in the bottom of an outer bomb in the portable passive welding bomb through a push rod in the welding device, and molten metal generated by combustion of welding materials is sprayed out from a nozzle to weld the welding piece.
The invention provides a portable passive welding bullet which comprises an outer bullet barrel with an opening at the bottom, an inner bullet barrel, welding materials, a firing sheet, a nozzle and a sealing sheet, wherein the welding materials are welded on the outer bullet barrel; the inner cartridge is placed inside the outer cartridge; the welding material is filled in the inner cylinder; after the welding material in the inner cartridge is filled to a certain thickness, an ignition sheet is placed; a nozzle is arranged on the ignition sheet; the sealing piece is placed on one side of the opening of the outer cylinder. The high-temperature molten metal and high-pressure gas generated by burning the welding material are sprayed out after being subjected to energy gathering and compression through the nozzle, and the spray jet has high temperature, high energy density and low heat loss, and has the characteristics of large thickness of the welding metal, high efficiency, wide application range, good use, storage and transportation safety and the like. Meanwhile, the welding bullet is suitable for manual operation, does not need an external power supply or an external air source, is convenient to carry, simple to operate, safe and reliable, is an ideal technical means for quickly welding metal in emergency, and has very important significance for better and faster completing emergency repair and rescue and relief tasks under the field or battlefield conditions.
The invention also provides a use method of the portable passive welding bomb, which is simple and easy to operate.
Drawings
FIG. 1 is a schematic view of a combustion type welding pen (stick);
fig. 2 is a schematic structural view of a longitudinal section of a portable passive welding bomb provided by the invention, wherein 1 is an outer bomb, 2 is an inner bomb, 3 is a welding material, 3-1 is a welding agent, 3-2 is an additive, 4 is an ignition sheet, 5 is a nozzle, and 6 is a sealing sheet;
FIG. 3 is a schematic cross-sectional structural view of a portable passive welding bomb provided in the present invention, wherein 1 is an outer bomb tube, 2 is an inner bomb tube, 3-1 is a welding agent, and 3-2 is an additive;
FIG. 4 is a schematic view of a nozzle structure, wherein 1 is an inner tapered hole, 2 is a straight hole, and 3 is an outer tapered hole;
FIG. 5 is a schematic structural diagram of a welding device, wherein 1 is a handle, 2 is a sleeve, 3 is a fixing structure, and 4 is a safety disc;
FIG. 6 is an overall view of the welding device and the portable passive welding bomb assembled together, wherein 1 is the portable passive welding bomb, 2 is the welding device, and 3 is the push rod;
FIG. 7 is a microscope photograph of a Q235 steel plate after welding;
fig. 8 is an SEM image of the Q235 steel plate after welding.
Detailed Description
The portable passive welding bomb provided by the invention is described in detail with reference to fig. 2 and 3 and the description.
The invention provides a portable passive welding bomb, the structure schematic diagram of the longitudinal section of which is shown in figure 2; comprises an outer cartridge 1 with an opening at the bottom, an inner cartridge 2, welding materials 3, an ignition sheet 4, a nozzle 5 and a sealing sheet 6; the inner cartridge 2 is placed inside the outer cartridge 1; the welding material 3 is filled inside the inner barrel 2; the welding material 3 in the inner cartridge 2 is filled to a certain thickness and then the ignition sheet 4 is placed; a nozzle 5 is arranged on the ignition sheet 4; the sealing sheet 6 is placed on the open side of the outer cartridge 1.
The portable passive welding bomb provided by the invention comprises an outer bomb tube with an opening at the bottom; the material of the outer cartridge is preferably metal; the inner wall of the outer cylinder is preferably coated with high-temperature-resistant fireproof paint; in a specific embodiment of the present invention, the outer cylinder with the inner wall coated with the high temperature resistant fireproof coating is preferably an outer cylinder with 45 # steel and the inner wall coated with ceramic, which can be called a ceramic lining steel cylinder. In the present invention, the length of the outer barrel is preferably 160mm, and the outer diameter of the outer barrel is preferably 50 mm. In the invention, from the technical point of view, once the passive welding bomb is ignited, the combustion process cannot be interrupted, and complete combustion must be completed, and from the point of view of specific experimental experience and convenient operation, the length of the outer bomb tube is set to be 160mm, so that the welding requirement of a certain length can be completed; if the welding length is long, one welding bullet can not meet the welding requirement, and the welding bullet can be continuously replaced for welding.
In the present invention, the wall thicknesses of the side surface and the bottom surface of the outer barrel may be the same or different. When the wall thickness of the side surface and the bottom surface of the outer cylinder is the same, the wall thickness of the outer cylinder is preferably 2-4 mm; when the wall thickness of the side surface of the outer cylinder barrel is different from that of the bottom surface, the wall thickness of the bottom surface is preferably larger than that of the side surface, specifically, the wall thickness of the side surface is preferably 2-4 mm, and the wall thickness of the bottom surface is preferably 4-6 mm.
In the present invention, the opening at the bottom of the outer barrel is preferably located at the center of the bottom of the outer barrel; the shape of the opening is preferably circular; the diameter of the circular opening is preferably 1/3-1/5 of the inner diameter of the outer barrel; the purpose of the opening is to allow the push rod to enter, pushing the inner cartridge. In the present invention, when the shape of the bottom opening of the outer barrel is preferably circular, one end of the push rod is preferably a solid cylindrical metal rod or a metal tube, and the end directly contacts the bottom of the inner barrel; the other end of the push rod is provided with a structure which is convenient to push and is similar to a holding mode and the like, and the end pushes the push rod. When the portable passive welding bullet is used for welding, a fuse is ignited, a ignition sheet is ignited, welding materials are ignited, meanwhile, an external push rod pushes an inner bullet to move to a nozzle position through an opening in the bottom of the outer bullet, high-temperature molten metal and high-pressure gas generated by combustion of the welding materials in the inner bullet are compressed through the nozzle and then are sprayed out, and the high-temperature molten metal is directly sprayed onto a welding piece for welding.
The portable passive welding bomb provided by the invention comprises an inner bomb tube; the inner cartridge is located inside the outer cartridge. In the invention, the material of the inner cylinder is preferably combustible paper material; the combustible paper material is preferably kraft paper coated with glue; the side wall thickness of the inner cartridge is preferably 1 mm; the bottom surface is preferably 3mm thick. The wall thickness of the inner cylinder is set to be 1mm, and two aspects are mainly considered: firstly, the inner cartridge has certain strength, so that the forming operation of the passive welding cartridge is facilitated; and secondly, the inner cylinder is burnt along with the welding material, the thickness is too thick, the welding material is not burnt completely, the push rod is influenced to push the passive welding bullet to move forwards, the thickness is too thin, and the welding material can be slag-attached to the inner wall of the outer cylinder, welded and the like.
The length of the inner cartridge is not particularly required, and the height of the inner cartridge is consistent with that of the outer cartridge after the inner cartridge is placed in the outer cartridge; in other words, it is: the length of the inner cartridge is equal to the length of the outer cartridge minus the thickness of the bottom surface of the outer cartridge; the concrete steps are as follows: when the length of the outer cartridge is 160mm and the bottom thickness is 5mm, the length of the inner cartridge is 160mm-5 mm-155 mm. In the invention, the distance between the outer wall of the inner cylinder and the inner wall of the outer cylinder is preferably (0, 0.2) mm, namely, the distance a between the outer wall of the inner cylinder and the inner wall of the outer cylinder is more than 0mm and less than or equal to 0.2mm, and a certain gap is reserved between the inner cylinder and the outer cylinder, so that the outer push rod can well push the inner cylinder.
The portable passive welding bomb provided by the invention comprises a welding material; the welding material is filled in the inner cylinder; the dense thickness of the welding material is preferably 1.86-3.5 g/cm3More preferably 2.7g/cm3. The filling height of the welding material in the inner cylinder is not particularly limited, and the filling height of the welding material, the thickness of the ignition sheet and the thickness of the nozzle are equal to the length of the inner cylinder and the wall thickness of the inner cylinder; that is, the height of the ignition sheet and the nozzle placed on the welding material is the same as the height of the inner cartridge and the outer cartridge. In a particular embodiment of the invention, the filling height of the welding material in the inner barrel is preferably 129 mm.
In the present invention, the welding material preferably includes a welding agent and an additive; the welding agent is preferably pressed into a solid cylinder and is mixed in the additive; fig. 3 is a schematic structural diagram of a cross section of the portable passive welding bullet provided by the invention, which well embodies the doping form of the welding agent and the additive in the welding material in the inner bullet barrel. In FIG. 3, 1 is an outer barrel, 2 is an inner barrel, 3-1 is a welding agent, and 3-2 is an additive; wherein the 3-1 solder is uniformly doped in the additive in the form of a plurality of solid cylinders. In the invention, the diameter of the solid cylinder formed by pressing the welding agent is preferably 1/5-1/3 of the inner diameter of the inner cylinder.
In the present invention, the welding agent preferably includes an oxidizing agent and an Al reducing agent; the mass ratio of the oxidant to the Al reducing agent is preferably 2.22: 1-3.63: 1. In the present invention, the oxidizing agent is preferably CuO or Fe2O3、Fe3O4、MnO2、Cr2O3、TiO2And NiO; when the oxidant is a mixture, the invention is applied to the mixtureThe mass ratio of the oxidizing agents in (1) is not particularly limited, and the oxidizing agents may be mixed at any weight ratio. In the invention, the mass percentage of the welding agent in the welding material is preferably 70-80%, and more preferably 77%.
In the present invention, the additives preferably include slag formers, diluents and alloying agents.
In the present invention, the slag former is preferably CaF2、CaCO3、B2O3One or more of MnFe and SiFe; when the slagging agent is a mixture, the mass ratio of each slagging agent in the mixture is not particularly limited, and any weight ratio can be adopted. In the invention, the preferable mass percentage of the slag former in the welding material is 6-10%.
In the present invention, the diluent is preferably Al2O3And/or SiO2(ii) a When the diluent is Al2O3And SiO2The amount of each diluent in the mixture is not particularly limited in the present invention, and may be any weight ratio. In the invention, the diluent accounts for 4-10% of the welding material by mass, and is more preferably 6%.
In the invention, the alloying agent preferably comprises Fe, Ni, Ag, Ti or rare earth materials, and the mass percentage of the alloying agent in the welding material is preferably 5-10%.
The welding material provided by the invention can generate high-temperature molten metal and high-pressure gas through combustion.
The portable passive welding bomb provided by the invention comprises an ignition sheet; the ignition sheet is placed on the filled welding material; the ignition sheet is preferably a cylinder, and the thickness of the cylinder ignition sheet is preferably 2-5 mm; the diameter of the cylindrical ignition tab preferably corresponds to the inner diameter of the inner barrel. In the invention, the center of the cylindrical ignition sheet is provided with a round hole; the purpose of the round hole is convenient for a fuse to ignite the ignition sheet. In the present invention, the ignition sheet is preferably a celluloid round plate coated with inflammable, and has a circular hole in the middle. The ignition sheet can be ignited by the fuse, when the portable passive welding bomb is used, the ignition sheet is ignited by the fuse, then the ignition sheet ignites the welding material, so that the welding material generates an oxidation-reduction reaction, and high-pressure gas and a large amount of high-temperature molten metal are released to be applied to welding of the metal material.
The portable passive welding bomb provided by the invention comprises a nozzle, wherein the nozzle is arranged above the ignition sheet; the nozzle comprises an inner conical hole, a straight hole and an outer conical hole; the structure of the nozzle is schematically shown in fig. 4, wherein 1 is an inner taper hole, 2 is a straight hole, and 3 is an outer taper hole; one side of the inner taper hole of the nozzle is in contact with the ignition sheet. In the present invention, the thickness of the nozzle is preferably 15 to 20mm (corresponding to the distance represented by e in fig. 4); the diameter of the straight hole is preferably 2-10 mm (corresponding to the distance represented by b in figure 4), and the outer diameter of the nozzle (corresponding to the distance represented by d in figure 4) is consistent with the inner diameter of the inner barrel; the diameter of the inner tapered bore (corresponding to the distance represented by c in fig. 4) is preferably slightly larger than the diameter of the outer tapered bore (corresponding to the distance represented by a in fig. 4). In the present invention, the material of the nozzle is preferably graphite or ceramic. The nozzle can gather the energy released by burning the welding material together, the energy is used for compressing the molten metal and the high-pressure gas and then spraying the compressed molten metal and the compressed high-pressure gas out of the nozzle, and the nozzle has the characteristics of high jet flow temperature, high energy density, small heat loss, large welding metal thickness, high efficiency, wide application range, good use, storage and transportation safety and the like.
The portable passive welding bomb provided by the invention comprises a sealing sheet, wherein the sealing sheet is arranged on one side of an opening of the outer sleeve and is used for sealing nozzles of the outer sleeve, the inner sleeve and the inner sleeve. The material, shape and size of the sealing sheet are not particularly limited, as long as the sealing sheet can seal the outer sleeve. In the present invention, the sealing piece is attached to the outer cylinder by means of gluing.
The invention also provides a use method of the portable passive welding bomb, which comprises the following steps:
the portable passive welding bomb is placed in a welding device, the welding device is held by hand to align with a welding piece, a sealing sheet of the portable passive welding bomb is broken through a fuse, a fuse ignition sheet is ignited, an inner bomb is pushed through an opening in the bottom of an outer bomb in the portable passive welding bomb through a push rod in the welding device, and heat generated by combustion of welding materials is sprayed out from a nozzle to weld the welding piece.
In the invention, the welding device is preferably a sleeve with a handle, and the specific structural schematic diagram is shown in fig. 5, wherein 1 is the handle, 2 is the sleeve, 3 is a fixing structure, and 4 is a safety disc (2 are bilaterally symmetrical); the fixing structure is preferably a nut; the safety disc is used for pulling the nozzle of the portable passive welding bullet when the push rod pushes, so that the nozzle and the outer bullet barrel or the inner bullet barrel are prevented from moving relatively; secondly, when the pressure in the inner bomb is too high, the nozzle moves outwards to push the two safety plates outwards, and the nozzle sprays out, so that the purpose of pressure relief is achieved, and the chamber explosion phenomenon is prevented; the material of rupture disc is preferably galvanized iron plate, and thickness is preferred 1 ~ 3mm, and more preferred 2 mm.
In the present invention, when the sleeve with the handle is used as the welding device (i.e. the welding device shown in fig. 5), the welding device and the portable passive welding bomb are assembled as a whole as shown in fig. 6, wherein 1 is the portable passive welding bomb, 2 is the welding device, and 3 is the push rod. With reference to fig. 6, the use method of the portable passive welding bomb is specifically and preferably as follows: the outer cartridge of portable passive welding bullet 1 passes through screw up fixed connection with welding set 2's sleeve pipe, the rupture disc front end with the gasket of portable passive welding bullet contacts, and the hand handle ignites the fuze, treats that the welding material begins the burning back, promotes the inner cartridge of push rod 3 forward promotion and simultaneously along welding direction removal sleeve pipe both can accomplish the welding.
The material of the fuse is not limited in the present invention, and a fuse known to those skilled in the art may be used.
In the welding process, the inner cartridge can be combusted along with welding materials, the push rod pushes the inner cartridge to move forwards from the circular hole in the rear part of the outer cartridge, and internal combustion products are sprayed out after being subjected to energy collection through the nozzle, so that the temperature of the outer cartridge can be increased, hands cannot be directly contacted with the outer cartridge to prevent scalding, but a tool such as a sleeve connected with the outer cartridge can be used for operation; in the whole welding process, the position of the nozzle is limited, namely the nozzle is fixed relative to the outer barrel when welding after welding materials are normally combusted, and on the other hand, from the safety perspective, when the pressure in the inner barrel is too high, the nozzle is sprayed out to be separated from the outer barrel, so that the purposes of pressure relief and explosion prevention are achieved. Therefore, the welding device is preferably used for welding, and the welding device provided by the invention is simple in structure and convenient to operate.
The portable passive welding bomb and the method for using the same provided by the invention are described in detail with reference to the following embodiments, but the portable passive welding bomb and the method for using the same are not to be construed as limiting the scope of the invention.
Example 1
The portable passive welding bomb comprises an outer bomb barrel with an opening at the bottom, an inner bomb barrel, welding materials, a firing sheet, a nozzle and a sealing sheet; assembling the portable passive welding bullet according to the structural schematic diagrams shown in fig. 2 and 3;
the length of the outer cartridge is 160mm, the outer diameter of the outer cartridge is 50mm, the wall thickness of the side surface of the outer cartridge is 3mm, the wall thickness of the bottom surface of the outer cartridge is 5mm, a circular opening in the bottom of the outer cartridge is positioned in the middle of the bottom of the outer cartridge, and the diameter of the circular opening is 12 mm;
the inner cartridge is a thick paper tube with the thickness of 1mm, the wall thickness of the bottom surface is 3mm, and the length of the inner cartridge is 155 mm; the distance between the outer wall of the inner cartridge and the inner wall of the outer cartridge is 0.05 mm;
the weld material had a compacted density of 2.7g/cm3The filling height of the welding material is 129 mm; the welding material comprises a welding agent and an additive; pressing the welding agent into 7 solid cylinders with the diameter of 12mm, and uniformly placing the solid cylinders in the additive; the solder comprises an oxidant (CuO, Fe)2O3、Fe3O4And NiO mass ratio of 10.12: 4.63: 1.58: 1)70.67 percent and a reducing agent Al 6.33 percent, wherein the additives comprise a slag former (mass ratio of SiFe to MnFe is 1: 1) 8% of a diluent (Al)2O3) 7% and 8% of alloying agent (Ni);
the ignition sheet is a celluloid round plate which is 3mm thick and 41.9mm in diameter and coated with inflammables;
the thickness of the nozzle is 20mm, the outer diameter of the nozzle is 41.9mm, the diameter of the inner conical hole is 36mm, the diameter of the outer conical hole is 18mm, and the diameter of the straight hole is 5 mm;
the sealing piece is a cylinder, the thickness of the cylindrical sealing piece is 3mm, the diameter of the cylindrical sealing piece is 50mm, and the diameter of the middle hole is 2 mm;
adopt foretell portable passive welding bullet to weld the Q235 steel sheet, can weld 1 welding piece, and welding thickness is 8mm, and welding length is about 50 mm. The microscope image of the welded Q235 steel plate is shown in fig. 7, and it can be seen from fig. 7 that: and an obvious transition region is arranged between the parent metal and the welding line alloy, the interface between the transition region and the parent metal is smooth, and the welding line alloy and the parent metal are combined together through intercrystalline in a welding fusion region. The SEM image of the Q235 steel plate after welding is shown in fig. 8, and it can be seen from fig. 8 that: the weld and the parent metal form good fusion welding combination.
The prior art combustion type welding pen (rod) in fig. 1 is capable of welding 1 weld piece with a weld thickness of only 5mm and a weld length of about 40mm with the same content of weld material.
The maximum power density is an important parameter for measuring the energy release condition of the welding bullet, and the energy release condition is an important parameter for measuring the welding elastic performance. The larger the maximum power density is, the more concentrated the energy release of the welding bullet is, and the welding of the welding bullet is facilitated. The invention needs to make the following assumptions when measuring the maximum power density of the portable passive welding bomb obtained by the invention and the welding ratio in the prior art:
it is assumed that the flux combustion reaction during welding satisfies the following conditions:
(1) the system is insulated;
(2) the specific heat of the product and the reactant does not change with the temperature;
(3) the reactants react 100% stoichiometrically and are irreversible.
Calculating Q according to thermodynamic data and the molar number of the chemical reaction substance and a heat equilibrium equationMax of；
And according to the formula
Calculating the maximum power density;
wherein, mu in the formulamaxThe maximum power density of the manual self-propagating welding rod is shown, t is the combustion time of the welding rod, eta is the welding thermal efficiency, and S is the minimum heating area and the sectional area. Eta is a constant under certain conditions and is mainly determined by the properties of a heat source, a welding process method, the type of welding materials, the properties, the size, the shape and the like of the welded metal. Considering that the minimum heating area of the welding method is large, the eta value of the manual self-propagating welding is 0.5 in the calculation.
According to theoretical calculation, the maximum power density of the welding pen (rod) is 5.6 multiplied by 103w/cm2(ii) a And the maximum power density of the welding bullet is 8.5 multiplied by 103w/cm2。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A portable passive welding bullet is characterized by comprising an outer bullet barrel with an opening at the bottom, an inner bullet barrel, welding materials, a firing sheet, a nozzle and a sealing sheet; the inner cartridge is placed inside the outer cartridge; the welding material is filled in the inner cylinder; after the welding material in the inner cartridge is filled to a certain thickness, an ignition sheet is placed; a nozzle is arranged on the ignition sheet; the sealing piece is placed on one side of the opening of the outer cylinder.
2. The portable passive welding bomb of claim 1, wherein the inner cylinder is made of a combustible paper material.
3. The portable passive welding bomb of claim 1, wherein the outer cylinder is metal.
4. The portable passive welding bomb of claim 1 or 2 or 3, characterized in that the distance between the inner and outer cartridge shell outer walls is (0,0.2] mm.
5. The portable passive welding bomb of claim 1, wherein the compacted density of the welding material is 1.86-3.5 g/cm3。
6. The portable passive welding bomb of claim 1 or 5, wherein the welding material includes a solder and an additive; the welding agent is pressed into a solid cylinder and is mixed in the additive.
7. The portable passive welding bomb of claim 6, wherein the solid cylinder has a diameter of 1/5-1/3 of the inner diameter of the inner cylinder.
8. The portable passive welding bomb of claim 6, wherein the welding agent includes an oxidizing agent and an Al reducing agent; the oxidant comprises CuO and Fe2O3、Fe3O4、MnO2、Cr2O3、TiO2And NiO; the welding agent accounts for 70-80% of the welding material by mass.
9. The portable passive welding bomb of claim 6, wherein the additives include slag formers, diluents, and alloying agents; the slagging agent is CaF2、CaCO3、B2O3One or more of MnFe and SiFe, wherein the slag former accounts for 6-10% of the welding material by mass percent; the diluent comprises Al2O3And/or SiO2The diluent accounts for 4-10% of the welding material by mass; the alloying agent comprises Fe, Ni, Ag, Ti orAnd the alloying agent accounts for 5-10% of the welding material by mass.
10. Use of a portable passive welding bomb according to any one of claims 1 to 9, comprising the steps of:
the portable passive welding bomb is placed in a welding device, the welding device is held by hand to align with a welding piece, a sealing sheet of the portable passive welding bomb is broken through a fuse, a fuse ignition sheet is ignited, an inner bomb is pushed through an opening in the bottom of an outer bomb in the portable passive welding bomb through a push rod in the welding device, and molten metal generated by combustion of welding materials is sprayed out from a nozzle to weld the welding piece.
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