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Balanced high-heat type aluminum hot-welding agent

A kind of thermite flux and high heat technology, applied in the direction of aluminotherm welding equipment, welding equipment, welding medium, etc., can solve the problems of difference in welding effect, difficulty in heat control, etc., and achieve the effect of uniform heat production

Inactive Publication Date: 2011-08-17
RAINBOWALLY CHENGDU LIGHTNING PROTECTIVE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of heat control, these fluxes adopt control methods such as the content of exothermic agent, the amount and particle size of aluminum powder, the amount and particle size of oxygen supply agent, the chemical ratio, the type and particle size of additives, etc., but these factors are relatively sensitive, and heat control is difficult to master , with different ambient temperature and cooling conditions, the welding effect is very different

Method used

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  • Balanced high-heat type aluminum hot-welding agent
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  • Balanced high-heat type aluminum hot-welding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example is a low-dose thermite flux composition ratio, and the equivalent weight (the sum of the mass of all components) is 85 grams. The composition and quality are shown in Table 1.

[0042] Table 1. Equivalent 85# thermite composition ratio table

[0043]

[0044] MgO is relatively stable at low temperature, does not participate in the reaction, and is equivalent to an inert additive, so adding too much will hinder the reaction. Adding too little can not play a role in adjusting the thermal peak. The mass content of MgO in this example is about 9%.

[0045] CuO particles with stepped distribution are used because particles with uniform particle size have the same combustion velocity and combustion peak, so the heat generated by the superposition of uniform particle size powder is in a normal distribution; the heat production in the initial stage and the end stage of combustion is less than that of external The heat dissipated, and the heat generated in the m...

Embodiment 2

[0054] This example is the composition ratio of medium dose thermite flux, and the equivalent weight (sum of all components) is 115 grams. The composition and quality are shown in Table 2. The mass content of MgO in this example is about 8%. The preparation and welding process of the solder powder is the same as in Example 1. The combustion reaction process of the solder powder is smooth, the mouth is round and the shape is full.

[0055] image 3 95mm welded by 115# flux 2 19-core steel strand with 4×40mm 2 Galvanized sheet T joint. Figure 4 Three sections of joint specimens are shown: section of copper-clad galvanized sheet, section of copper-clad stranded wire, and overlap of galvanized sheet and steel stranded wire. The section was observed after grinding, mechanical polishing, and tissue erosion. From the macroscopic section of the sample, it can be seen that the welding interface is well bonded, and there are no continuous pores, cracks, incomplete fusion, inclusio...

Embodiment 3

[0062] This example is a high-dose thermite flux component ratio, and the equivalent weight (sum of all components) is 150 grams. The composition and quality are shown in Table 3.

[0063] Table 3. Equivalent 150# thermite composition ratio table

[0064]

[0065] The mass content of MgO in this example is about 7%. The preparation of solder powder and the welding process are the same as Example 1 and Example 2. The combustion reaction process of the solder powder is smooth, the mouth is round, and the shape is full. Figure 7 4×40mm welded by 150# flux 2 Galvanized sheet T joint. Figure 8 It is the microstructure of the welded joint of the galvanized sheet. Figure a shows the structure near the fusion line between the galvanized sheet and copper. The grains of the base metal galvanized sheet are in a semi-melted state, and there is a transition between the galvanized sheet and copper. layer (iron, copper, zinc solid solution); Figure b shows the microstructure of mol...

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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 [0001] The invention belongs to the technical field of welding, and in particular relates to a composition formula of thermite flux. Using the principle of chemical reaction balance movement, by moving the heat peak of the thermite flux, the flux combustion can achieve the effect of balanced heat generation, high temperature and no explosion. Background technique [0002] Thermite welding, also known as hot fusion welding, is a kind of welding that uses the elemental metal filling weld formed by the reduction reaction of reducing agent aluminum and metal oxide powder, and uses the high temperature generated to melt the material to be welded to achieve the purpose of welding method. Thermite welding is a permanent metallurgical connection. Compared with the traditional bolt connection, the thermite welding method has the advantages of simple operation, high efficiency, good weld performance, and wide application range. It is widely used. [0003] In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/34B23K23/00
Inventor 曾子成罗传红刘毛萍
Owner RAINBOWALLY CHENGDU LIGHTNING PROTECTIVE TECH
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