CN102152026A - Balanced high-heat type aluminum hot-welding agent - Google Patents
Balanced high-heat type aluminum hot-welding agent Download PDFInfo
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Abstract
The invention discloses a balanced high-heat type aluminum hot-welding agent. MgO is added into components and is reduced into elementary substance Mg under high temperature and heat is absorbed; and then Mg is oxidized into MgO under low temperature and the heat is released. Through this process, the redistribution of the heat during thermit reaction is realized and the purpose of uniform heat production is reached. The balanced high-heat type aluminum hot-welding agent comprises the components by weight portions as follows: 80-85 percent of CuO powder, 6-12 percent of Al powder, 6-9 percent of MgO, 0-1 percent of CaF2, and 0-1 percent of SiO2. The balanced high-heat type aluminum hot-welding agent has the characteristics of high heat, balance, and safety. The heating volume of the balanced high-heat type aluminum hot-welding agent is not sensitive to component parameters, thus being convenient for scale batch production, and being capable of being broadly used for quickly and reliably connecting metal structures or connection under outdoor power-less conditions.
Description
Technical field
The invention belongs to welding technology field, be specifically related to a kind of component prescription of aluminum heat flux.Utilize the chemical reaction equilibrium shifting principle,, make the solder flux burning reach balanced heating, the high not quick-fried effect of temperature by the thermal spike of mobile aluminum heat flux.
Background technology
Thermit welding also claims thermofussion welding, is that the elemental metals that utilizes reducing agent aluminium and metal oxide powder reduction reaction to form is filled weld seam, and utilizes the high temperature that is produced, and melts soldered material, reaches a kind of welding method of welding purpose.Thermit welding is a kind of permanent connection of metallurgical binding, compares with traditional bolt to be connected, and that the exothermic welding method has is simple to operate, efficient is high, Weld Performance good, advantage such as applied widely, uses very extensive.
In order to obtain qualified welding point, must allow solder flux have higher quantity of heat production, could guarantee that the liquid copper that generates has good flowability and wellability, avoids producing in the weld seam filling process defectives such as cold shut, pore, slag inclusion.If but quantity of heat production is excessive, can produce the splash problem on the one hand, influence joint quality; On the other hand, excessive heat will make it to take place thermal explosion, destroys instrument and utensil, more with the entail dangers to personal safety.Therefore, the configuration of solder flux must be considered safety problem, rationally controls caloric value.
Existing aluminum heat flux all is made up of exothermic mixture, alloying constituent and slag former three parts, and the heat control strategy of solder flux mainly adopts following several method.At first, heating dosage is determining the exothermic heat of reaction amount, and heating dosage is little, and ignition temperature is just low, does not reach the requirement of material welding, but heating dosage is big, then because ignition temperature is too high, makes internal gas sharply expand, and splashes and explodes.As seen it is very important finding out suitable heating dosage.Secondly, aluminum powder particle size also is that heat is controlled crucial parameter, and it directly affects fired state.This be since fine-grained aluminium powder because of reaction carry out very fast so that react moment towards periphery the heat loss of environment (heat conduction cause) do not take place; And coarse grained aluminium powder needs the certain fusing and the time of diffusion, and heat produces and heat loss is carried out simultaneously, so the peak value of temperature curve is low.From the ignition temperature-time graph of different grain size aluminium powder as seen, along with the increase of aluminum powder particle size, the increasing degree of ignition temperature diminishes, and the reaction time prolongs.The particle size influences of aluminium powder burning velocity, thereby influenced the combustion peak temperature.The granularity of cupric oxide component also has very big influence to the caloric value in the unit interval, and particle is thin more, and the contact surface between aluminium and the cupric oxide is long-pending big more, and the caloric value in the unit interval is big more, and reaction Shaoxing opera is strong, and powder splashes, even produces blast.Under violent thermodynamic activity, to fill not steadily, weld defect is many, difficult quality guarantee.Therefore, granularity control also is a kind of main method of heat control.In addition, at different combustion systems, ignition temperature is the variation tendency difference in time.For example, Chang Yong Al-CuO system, CaSi
2-CuO system has different burning velocities and ignition temperature, with different combustion system blend, also can reach the purpose of control heat.
Aluminum heat flux on the present domestic market has a variety of, the several times that general external solder flux price is domestic solder flux, and welding effect slightly is dominant.These solder flux are all adopting exothermic mixture content, aluminium powder dosage and granularity, oxygenate quantity and control methods such as granularity, stoicheiometry, additive types and granularity aspect the heat control, but these factors all compare responsive, heat control is difficult to be grasped, with environment temperature and cooling condition difference, welding effect has very big difference.Therefore, passivation influences the parameter of thermite heat release, improves flux composition, and the control calory burning improves welding quality, catches up with and surpasses the foreign technology level, is main target of the present invention.
Summary of the invention
Technical problem to be solved by this invention is to provide the aluminum heat flux that a kind of thermal discharge is big and safety is controlled.
The general idea of the inventive method is as follows:
On the thermodynamics angle, redox reaction is the neither endothermic nor exothermic reaction, follows the chemical balance shifting principle, and under certain condition, course of reaction can reverse.Shown in Figure 1, when low temperature, magnesium is more active than aluminium, but under hot conditions, aluminum ratio magnesium is active, and therefore, when high temperature, reducing agent aluminium can cement out magnesium from magnesia.Use the size of standard Gibbs free energy changing value Δ G in theory, expect that can the reduction reaction of certain oxide carry out.
4/3Al(l)+2MgO(s)＝2Mg(g)+2/3Al
2O
3(s)
ΔG
Mg＝344900-197.78T (J)；
By Δ G
Mg=O calculate in the redox reaction Al also the Mg initial temperature be 1743.86K (1371 ℃).Simultaneously, magnesian thermal reduction is an endothermic reaction, and the fuel factor that magnesia is reduced reaction is very big, and its numerical value is:
2Al(l)+3MgO(s)＝3Mg(g)+Al
2O
3(s)
30.97-601.24127.6-1669.8，(kJ/mol)
ΔH＝1669.8-127.6×3-601.24×3+30.97×2＝-454.78kJ
By above calculating as can be known, magnesia just can be finished from external world's suction heat energy with the reaction needed of aluminium reducing.Utilize magnesia reduction process when high temperature (more than the 1743.86K) to absorb outside heat, can absorption portion thermite burning institute liberated heat, weaken the thermal spike of thermite, prevent that temperature from skyrocketing, can prevent like this that temperature is too high and produce splash and blast.And the magnesia reduction process is therefore little to the speed influence of thermite combustion reaction only at hot stage absorption heat energy.
In the thermite combustion reaction later stage, heat production descends gradually, and temperature is also along with decline, and the magnesium part that generated early stage is overflowed with the steam form, and the magnesium that does not overflow combines with decomposition oxygen in the thermite once more, and magnesium again be oxidized, and discharges a large amount of heat.
Mg(g)+O(g)＝MgO(s)
127.60-601.24，(kJ/mol)
ΔH＝601.24+127.6＝728.84kJ
In sum, after the magnesia component is added into, MgO reduction heat absorption when the more temperature of heat production is higher, Mg oxidation heat liberation when the less temperature of heat production is low.This process shows that the heat of heat production peak phase partly is moved to the heat production decline stage, and the heat production peak of thermite is moved like this, makes thermite on average generate heat in whole combustion process.
Need to prove that these two processes are not to carry out fully stage by stage, on the surface that spills into liquid pool, surface temperature is lower such as the magnesium steam that produces, and magnesium also can oxidizedly be given birth to heat, helps improving the surface temperature in liquid molten bath.This shows, after the magnesia component is added into, thermite burn formed liquid molten bath not only before and after heat production even, and each position temperature equalization such as surfaces externally and internally, thus it is even to reach the entire reaction heat production, prevents excessive heat production and the effect of blasting.
The MgO component that adds in solder flux, initial state and final state all are MgO, but it is not simple additive, is different from the effect of chemical catalyst yet, and it can make the thermal spike translation of thermit reaction.Another benefit of the MgO component that adds in solder flux is: select which kind of oxygenate all undesirable separately, pluses and minuses are respectively arranged.Select compound oxygenate, can make full use of the advantage of various oxygenates, learn from other's strong points to offset one's weaknesses.Cu
2The low-temperature decomposition oxygen supply of O, CuO is oxygen supply in exothermic reducing reaction, produces oxygen behind the MgO pyrolytic, the classification oxygen supply mode of taking low temperature, heat release oxygen supply to combine with the high temperature oxygen supply, thus the thermite combustion reaction is fully finished.
To sum up, the present invention adds MgO in the aluminum heat flux prescription, is reduced into simple substance Mg and heat absorption by MgO under the high temperature, and Mg is oxidized to the process of MgO and heat release again under the low temperature, realizes the reallocation of heat in the thermit reaction process, reaches the uniform purpose of heat production.
High pattern of fever aluminum heat flux provided by the present invention contains the MgO of mass content 6～9%.
Further, high pattern of fever aluminum heat flux of the present invention, its composition and mass content thereof are:
CuO powder 80～85%, Al powder 6～12%, MgO 6～9%, CaF
20～1%, SiO
20～1%.
As a kind of preferred,
The granularity of described CuO powder is at 40～300 orders, and the granularity of described CuO powder distributes by gradient.
The granularity of described Al powder is at 30～60 orders, and the granularity of described Al powder distributes by gradient.
Described CaF
2, SiO
2With the granularity of MgO at 100～200 orders.
The present invention utilizes the chemical reaction equilibrium shifting principle, adds MgO in component, is reduced into the process that simple substance Mg is oxidized to MgO again by MgO, the reallocation of heat in the realization response process, and it is even to reach heat production, thereby has reached high heat and not quick-fried.This solder flux mainly is applicable to the connection under rapid and reliable connection of metal structure or the open-air no electric condition, can realize the welding point of the various ways such as butt joint, overlap joint, corner connection between sheet material, bar, the lead by die assembly.
Description of drawings
Fig. 1. the standard free energy of formation of oxide and the relation of temperature
Fig. 2 .85# 95mm that solder flux welds
219 core steel strand wires T joints
Fig. 3 .115# 95mm that solder flux welds
2Steel strand wires and 4 * 40mm
2Galvanized sheet T joint
Fig. 4. thermite weld joint macroscopic view section photo
Fig. 5. the microscopic structure (200 *) of twisted wire and galvanized sheet joint different parts
Fig. 6. welding point hardness distribution line
Fig. 7 .150# 4 * 40mm that solder flux welds
2Galvanized sheet T joint
Fig. 8. the microscopic structure (200 *) at galvanized sheet welding point position
The specific embodiment
Embodiment 1
This example is low dose of aluminum heat flux proportioning components, and equivalent (all the components quality summation) is 85 grams.Composition and quality are as shown in table 1.
Table 1. equivalent 85# thermite proportioning components table
MgO is more stable at low temperatures, does not participate in reaction, is equivalent to inert additwe, therefore adds too much can hinder to react to carry out.Add and to play the effect of adjusting thermal spike very little.The MgO mass content is about 9% in this example.
The CuO particle that adopts ladder to distribute be because the particle of uniform particle size has identical burning velocity and burning peak, so the heat that single-size degree powder burning stack back produces becomes normal distribution; The burning starting stage and the ending phase heat production less than external dispersed heat, and the burning stage casing heat production too much, much larger than heat radiation, the result is that heat is not used effectively, the cast gate temperature descends on the contrary, and is easy to generate blast.Adopt ladder granularity powder, the burning peak of variable grain is staggered mutually, heat three stages before, during and after burning that make solder flux produce evenly distribute, and avoid blast, and such exothermal process helps improving the cast gate temperature simultaneously.
The alumina particles that adopts ladder to distribute, reason is the same.The smallest particles that it is emphasized that the Al grain is bigger than the smallest particles of CuO.The reason that does not adopt the atomized aluminium component is to be easy to generate blast.
The CuO particle shape is recommended to adopt spheric granules, is that particle is difficult for broken because the oxidizability of spherical CuO particle is lower, and granularity is stable; The surface area minimum of next spheric granules, burning velocity is slow, should not explode; The space is little between spheric granules once more, powder density height, and contained gas flow is few in the powder, helps that heat is concentrated and minimizing is dusted.Sheet CuO particulate oxidation degree height, burning velocity is fast, and caloric value is big, but poor controllability.
CaF
2Influence to burning velocity is very big, and result of the test shows that its content had better not surpass 1%.Excessive CaF
2Can cause combustion velocity to descend, heat promotes difficulty, and the decline of slag fusing point, and flowability is strong excessively, influences the closing in and the moulding of weld bond.
SiO
2Burning velocity also there is bigger influence, does not all add SiO in domestic a lot of solder flux
2Use SiO
2Can partly replace CaF as fire retardant
2Influence, can control burning velocity well, prevent the blast.Simultaneously, with CaF
2Add solder flux in 1: 1 ratio, help changing slag system.
To carry out earlier 300 ℃/2H oven dry in drying oven with last component, be that the counterweight balance of 0.1g is weighed with minimum resolution then, each component mixed again, and makes aluminum heat flux.
Steel core twisted wire and galvanized steel plain sheet that desire connects are put into graphite fusible pattern container, clamp with clamp.The top of crystal vessel is equivalent to crucible, in crucible, put into spacer earlier, stop mixed-powder to drain in the fusible pattern, pour the solder flux of configuration into crucible again, put powder on fire, light powder on fire with lighter or blasting fuse, make mixed-powder generation chemical reaction, form high-temperature liquid state and fill metallic copper and liquid welding slag.Liquid metal separates because of different proportion relation in the mould of reaction crucible with liquid welding slag.Wherein liquid metal copper finally flows in the fusible pattern, makes lead be melted into one.And liquid welding slag is deviate from above it.Ignite after the blasting fuse, operating personnel promptly should go in the not far safety zone, wait for liquid cooling of filling metal quietly.By the time mould and weldment temperature are back to room temperature substantially, can open mould, knock out the welding slag on the weldment.Put and clear up mould then in order, prepare the welding of next identical weldment.
The 95mm that Fig. 2 is welded for the 85# solder flux
219 core steel strand wires T joints.The combustion reaction process was finished in 2 seconds in the experiment, and course of reaction is steady, the generation of not splashing.Form slag cup shell at the fusible pattern perisporium, knock slag open, do not have the copper particle to exist.Joint visual examination color and luster is purplish red, and it is mellow and full to close up, and it is full to be shaped, and does not have blemish, shows that the caloric value of thermite is very high.Inhibitory reaction is too violent and dust, splash, explode effectively to add MgO in the configuration of thermite simultaneously, stablizes whole solder flux.CaF
2And SiO
2Content has tangible influence to taking off the slag effect, and suitably proportioning can obtain the bright smooth welding point in surface, and resulting slag is knocked out easily, presents glassy.
Embodiment 2
This example is the aluminum heat flux proportioning components of middle dosage, and equivalent (all the components quality summation) is 115 grams.Composition and quality are as shown in table 2.The MgO mass content is about 8% in this example.The preparation of welding powder and welding process are with example 1, and the combustion reaction process of welding powder is steady, and it is mellow and full to close up, and moulding is full.
Fig. 3 is welded 95mm by the 115# solder flux
219 core steel strand wires and 4 * 40mm
2Galvanized sheet T joint.Figure 4 shows that three cross sections of joint sample: copper applies the zine plate cross section, copper applies twisted wire cross section, galvanized sheet and steel strand wires overlap joint.The cross section is corroded the back through polishing, machine glazed finish, tissue and is observed, and finds out from macroscopical section of sample, and weld interface is in conjunction with good, defective existence such as reach weld metal inner no continuity pore, crackle, incomplete fusion at the interface, be mingled with.Except twisted wire center high-temperature copper liquid is not filled and formed indivedual cavities, other position is in conjunction with good.Even if be easy to generate the zinc coat faying face of cold shut, there is not obvious defects to produce yet.
Table 2. equivalent 115# thermite proportioning components table
The sample that corrosion is good is placed under the large-size horizontal OLYMPUS light microscope observes the tissue and the form of mainly observing the filler metallic copper, the microscopic structure of observing copper and steel composition surface.Figure 5 shows that weld seam respectively distinguishes tissue topography, wherein scheming a, b is copper and galvanized sheet faying face; Figure c, d are copper and steel strand wires faying face; Figure e is the copper matrix; Figure f is a field trash in the copper matrix.As can be seen from the figure: (1) dark matrix is the tissue of steel, and ferrite (twisted wire), pearlite (twisted wire steel core), martensite and pearlitic structrure (galvanized sheet) are arranged; (2) light matrix is the copper based solid solution in the weld metal; (3) deposited copper and matrix bond are good, do not have various microdefects and exist, and existing tangible transition region between weld seam and the mother metal is the fusion area, overheated liquid copper metal molten and the mother metal that has wet interface locations; Have on the faying face of copper and galvanized sheet a matrix be copper in the middle of transition region mutually because the fusing of zinc layer and copper blend formation solid solution (zinc yellow copper, hardness is higher), and on the faying face of copper and steel strand wires, do not find this transitional face.(4) find in the copper matrix that the dendritic crystalline particle is second phase of separating out, and can regard solidification products as; Find to exist in the body at the same level the globular inclusion of a large amount of hard phases simultaneously, most diameter is 20-40 μ m, and respective diameters reaches 70 μ m, is considered to product Al
2O
3Be mingled with, the reason of its generation is because the oxidized generation of Al Al
2O
3Afterwards, in time do not discharge, finally freeze solidly on mutually between the copper metal along with the cooling of metallic copper on every side, thereby formed round spot structure with independent.The liquid copper of (5) filling between the steel strand wires thigh combines also very good with mother metal.All in all, spread mutually at the melt run position between deposited copper in zones of different weld interface place and the mother metal matrix, grow, mix obviously, realized good metallurgical binding, this provides solid foundation and good assurance for the mechanical property and the electric conductivity of welding point excellence.
Fig. 6 has shown the hardness distribution curve at upper edge, the cross section thickness direction that copper combines with galvanized sheet, is distance with the abscissa, and ordinate is a hardness, according to the metallographic Vickers hardness of surveying, obtains the hardness distribution curve.The hardness distribution curve is that both sides hardness is lower, and middle hardness is higher.On both sides (0-2.2mm, 5.4-7.6mm) except that indivedual high hardness value (beating on hard phase particle), average hardness value is 125MPa; In middle (2.2-5.4mm) average hardness value is 180MPa; The hardness distribution curve has reflected that both sides are deposited copper, and the centre is the joint form of steel.From the hardness distribution situation, the formed joint of welding process has kept the hardness and the plasticity of deposited copper, and the hardness of steel and plasticity do not have significant change yet, so brittle fracture can not take place joint.
On JEOL SEM ESEM, interface element distributed and carried out point analysis and line analysis.The result shows that the weld seam center is based on copper, and the fusion area average assay is Cu 74%, and Fe 26%, based on copper, proves absolutely that the fusion area is to be obtained by high temperature copper aqueous fusion mother metal; Carried out sufficient diffusion at both sides, boundary zone Fe and Cu.
Embodiment 3
This example is heavy dose of aluminum heat flux proportioning components, and equivalent (all the components quality summation) is 150 grams.Composition and quality are as shown in table 3.
Table 3. equivalent 150# thermite proportioning components table
The MgO mass content is about 7% in this example.The preparation of welding powder and welding process are with example 1, example 2.The combustion reaction process of welding powder is steady, and it is mellow and full to close up, and moulding is full.Fig. 7 is welded 4 * 40mm by the 150# solder flux
2Galvanized sheet T joint.Fig. 8 is the microscopic structure at galvanized sheet welding point position, and figure a is near the tissue the melt run between galvanized sheet and the copper, and mother metal galvanized sheet crystal grain is presented the semi-molten state, has transition zone (iron, copper, zinc solid solution) between galvanized sheet and the copper; Figure b melts the tissue topography of applying copper.Tissue signature shown in Figure 8 and tissue signature shown in Figure 5 are basic identical.
More than in the aluminum heat flux of three kinds of equivalents exothermic mixture (CuO+Al) total content belong to the caloric value height and join state all more than 93%.Join under the state at this height, solder flux burning is not splashed, explosion phenomenon, and the moulding of closing up simultaneously is attractive in appearance, and weld seam is filled not to be had the cavity and take place, and it is big and heat production is balanced to show that solder flux is sent out the combustion amount, illustrate that component MgO has played the effect of adjustment heat.When the thermite preparation of above different equivalents, the solder flux equivalent increases, and increases the big component equivalent of particle diameter as far as possible, rather than increases the little component equivalent of particle diameter.
Claims (6)
1. high pattern of fever aluminum heat flux of equilibrium, it is characterized in that: in the aluminum heat flux prescription, add MgO, be reduced into simple substance Mg and heat absorption by MgO under the high temperature, Mg is oxidized to the process of MgO and heat release again under the low temperature, realize the reallocation of heat in the thermit reaction process, reach the uniform purpose of heat production.
2. high pattern of fever aluminum heat flux as claimed in claim 1 is characterized in that, contains the MgO of mass content 6 ~ 9%.
3. high pattern of fever aluminum heat flux as claimed in claim 2 is characterized in that the composition and the mass content thereof of described aluminum heat flux are: CuO 80 ~ 85%, and Al 6 ~ 12%, and MgO 6 ~ 9%, CaF
20 ~ 1%, SiO
20 ~ 1%.
4. as claim 2 or 3 described high pattern of fever aluminum heat flux, it is characterized in that: the granularity of described CuO powder distributes by gradient, and granularity is at 40 ~ 300 orders.
5. as claim 2 or 3 described high pattern of fever aluminum heat flux, it is characterized in that: the granularity of described Al powder distributes by gradient, and the granularity of Al powder is at 30 ~ 60 orders.
6. as claim 2 or 3 described high pattern of fever aluminum heat flux, it is characterized in that: described CaF
2, SiO
2With the granularity of MgO at 100 ~ 200 orders.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071919A (en) * | 2012-12-27 | 2013-05-01 | 新昌县人通电力技术有限公司 | Metal fusion welding method |
| CN103433646A (en) * | 2013-09-06 | 2013-12-11 | 云南宇恬防雷材料有限公司 | Novel hot-melt welding material and preparation method thereof |
| CN103557377A (en) * | 2013-11-06 | 2014-02-05 | 周小新 | Method for preparing ceramic-lined composite stainless steel tube |
| CN103789548A (en) * | 2012-10-31 | 2014-05-14 | 中国科学院理化技术研究所 | Thermite for synthesizing copper-based composite material by supergravity-assisted combustion |
| CN104107990A (en) * | 2014-06-23 | 2014-10-22 | 江苏安荣电气设备有限公司 | Heat releasing welding powder formula |
| CN105750761A (en) * | 2016-04-21 | 2016-07-13 | 武汉理工大学 | Heat melting welding material |
| CN108326466A (en) * | 2018-02-07 | 2018-07-27 | 郑州机械研究所有限公司 | A kind of highly conductive aluminothermy welding powder |
| CN109014058A (en) * | 2018-09-14 | 2018-12-18 | 禹州市恒利来合金有限责任公司 | A kind of classification oxygen supply high fever insulated feeder material of fever stage by stage |
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| CN101637853A (en) * | 2009-09-01 | 2010-02-03 | 中国电力科学研究院 | Copper-clad steel/copper grounding grid heat release welding flux with high safety |
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| CN101856775A (en) * | 2009-04-07 | 2010-10-13 | 新昌县雷鹰科技发展有限公司 | Hot melt welding flux |
| CN101637853A (en) * | 2009-09-01 | 2010-02-03 | 中国电力科学研究院 | Copper-clad steel/copper grounding grid heat release welding flux with high safety |
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| CN103789548A (en) * | 2012-10-31 | 2014-05-14 | 中国科学院理化技术研究所 | Thermite for synthesizing copper-based composite material by supergravity-assisted combustion |
| CN103789548B (en) * | 2012-10-31 | 2016-03-09 | 中国科学院理化技术研究所 | Thermite for synthesizing copper-based composite material by supergravity-assisted combustion |
| CN103071919A (en) * | 2012-12-27 | 2013-05-01 | 新昌县人通电力技术有限公司 | Metal fusion welding method |
| CN103433646B (en) * | 2013-09-06 | 2016-02-03 | 云南宇恬防雷材料有限公司 | A kind of new-type heat-melting welding material and preparation method thereof |
| CN103433646A (en) * | 2013-09-06 | 2013-12-11 | 云南宇恬防雷材料有限公司 | Novel hot-melt welding material and preparation method thereof |
| CN103557377B (en) * | 2013-11-06 | 2015-09-09 | 周小新 | The preparation method of ceramic-lined composite stainless steel pipe |
| CN103557377A (en) * | 2013-11-06 | 2014-02-05 | 周小新 | Method for preparing ceramic-lined composite stainless steel tube |
| CN104107990A (en) * | 2014-06-23 | 2014-10-22 | 江苏安荣电气设备有限公司 | Heat releasing welding powder formula |
| CN105750761A (en) * | 2016-04-21 | 2016-07-13 | 武汉理工大学 | Heat melting welding material |
| CN105750761B (en) * | 2016-04-21 | 2018-01-12 | 武汉理工大学 | Sweat soldering material |
| CN108326466A (en) * | 2018-02-07 | 2018-07-27 | 郑州机械研究所有限公司 | A kind of highly conductive aluminothermy welding powder |
| CN108326466B (en) * | 2018-02-07 | 2020-02-14 | 郑州机械研究所有限公司 | High-conductivity aluminum hot welding powder |
| CN109014058A (en) * | 2018-09-14 | 2018-12-18 | 禹州市恒利来合金有限责任公司 | A kind of classification oxygen supply high fever insulated feeder material of fever stage by stage |
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Application publication date: 20110817 |