CN109366040B - Exothermic welding agent and welding method thereof - Google Patents
Exothermic welding agent and welding method thereof Download PDFInfo
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- CN109366040B CN109366040B CN201811557719.XA CN201811557719A CN109366040B CN 109366040 B CN109366040 B CN 109366040B CN 201811557719 A CN201811557719 A CN 201811557719A CN 109366040 B CN109366040 B CN 109366040B
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
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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
- B23K23/00—Alumino-thermic welding
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
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Abstract
The invention discloses a heat release welding agent and a welding method thereof. The method comprises the following steps: s1, batching: the exothermic welding agent comprises welding powder and ignition powder; s2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould; s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity; s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; s5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part. The invention ensures that the exothermic welding reaction is stable and the welding quality is improved.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a heat release welding agent and a welding method thereof.
Background
Exothermic welding is a simple, high efficiency, high quality metal joining method. Exothermic welding welds metals by high temperature generated by thermite reaction to achieve high quality weld results. This reaction is carried out in a high temperature resistant graphite mold, and under normal use conditions, one mold can weld more than 70 points. The exothermic reaction process takes only a short, few seconds to complete. The stability of the existing exothermic welding needs to be improved.
Disclosure of Invention
The invention aims to provide an exothermic welding agent and a welding method thereof, which solve the problem that the existing exothermic welding quality needs to be improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the exothermic welding agent consists of copper oxide, aluminum powder, magnesium powder, calcium fluoride and silicon powder. Under the condition that the copper oxide and the aluminum powder are ignited, copper and aluminum oxide are generated through reaction, a large amount of heat is released, a welding body is welded, and the magnesium powder can be used as ignition powder; the calcium fluoride can be used as a cosolvent, can reduce the melting point of refractory substances, promotes the flow of material slag, and enables the material slag and metal to be well separated; the addition of the silicon powder improves the high temperature resistance, wear resistance and oxidation resistance of the product; the formula ensures that the exothermic welding reaction is stable and the welding quality is improved.
Preferably, the composition further includes potassium nitrate and manganese nitrate. The potassium nitrate and the manganese nitrate can play a combustion-supporting role and cannot pollute the environment.
Preferably, the components comprise, by weight, 84-95 parts of copper oxide, 8.4-10.5 parts of aluminum powder, 0.24-0.58 part of magnesium powder, 0.68-0.95 part of calcium fluoride and 0.45-0.78 part of silicon powder.
Preferably, the components comprise, by weight, 94-95 parts of copper oxide, 9-10.5 parts of aluminum powder, 0.15-0.45 part of magnesium powder, 0.35-0.5 part of calcium fluoride, 0.35-0.78 part of silicon powder, 0.25-0.35 part of potassium nitrate and 0.45-0.8 part of manganese nitrate.
Preferably, the particle size distribution of the copper oxide is 76-86% of 40-60 meshes, 12-22% of 60-80 meshes and less than or equal to 2% of the rest. The grain diameter of the copper oxide has influence on the reaction speed and the stable phase, the reaction speed is moderate according to the proportion, the reaction is stable, and the formed welding points have balanced and compact density.
An exothermic solder welding method comprising the steps of:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride and silicon powder, and the ignition powder comprises magnesium powder;
s2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity;
s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Preferably, the welding powder further comprises potassium nitrate and manganese nitrate.
Preferably, the copper oxide is 94-95 parts by weight, the aluminum powder is 9-10.5 parts by weight, the magnesium powder is 0.15-0.45 part by weight, the calcium fluoride is 0.35-0.5 part by weight, the silicon powder is 0.35-0.78 part by weight, the potassium nitrate is 0.25-0.35 part by weight, and the manganese nitrate is 0.45-0.8 part by weight.
Preferably, in the step of cleaning in S3, the solder is preheated to 140 to 170 ℃, and then the surface material of the solder is brushed off to remove the oxide on the surface.
Preferably, the inner diameter of the hollow tube is 1/15-1/20 of the outer diameter of the welding powder. The diameter of the hollow tube, namely the diameter of the ignition powder, is limited, the diameters of the ignition powder and the welding powder are in proportion, the reaction is most stable, and the formed welding point is uniform and compact in density.
Compared with the prior art, the invention has the beneficial effects that: the invention ensures that the exothermic welding reaction is stable and the welding quality is improved; the invention has moderate reaction speed and stable reaction, and the formed welding point has balanced and compact density.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride and silicon powder, and the ignition powder comprises magnesium powder; calculated by weight portion, 95 portions of copper oxide, 8.4 portions of aluminum powder, 0.58 portion of magnesium powder, 0.68 portion of calcium fluoride and 0.78 portion of silicon powder.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity;
s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Example 2:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride and silicon powder, and the ignition powder comprises magnesium powder; calculated by weight portion, 84 portions of copper oxide, 10.5 portions of aluminum powder, 0.24 portion of magnesium powder, 0.95 portion of calcium fluoride and 0.45 portion of silicon powder. Wherein the grain size distribution of the copper oxide is 86 percent of 40-60 meshes, 12 percent of 60-80 meshes and the rest is 2 percent.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity;
s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Example 3:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride, silicon powder, potassium nitrate and manganese nitrate, and the ignition powder comprises magnesium powder; 94 parts of copper oxide, 10.5 parts of aluminum powder, 0.15 part of magnesium powder, 0.5 part of calcium fluoride, 0.35 part of silicon powder, 0.35 part of potassium nitrate and 0.8 part of manganese nitrate. Wherein the grain size distribution of the copper oxide accounts for 76 percent of 40 meshes, 22 percent of 60-80 meshes and the rest is 2 percent. The reaction speed of the copper oxide grain size distribution is moderate according to the proportion, the reaction is stable, and the density of the formed welding point is balanced and compact. Under the condition that the copper oxide and the aluminum powder are ignited, copper and aluminum oxide are generated through reaction, a large amount of heat is released, a welding body is welded, and the magnesium powder can be used as ignition powder; the calcium fluoride can be used as a cosolvent, can reduce the melting point of refractory substances, promotes the flow of material slag, and enables the material slag and metal to be well separated; the addition of the silicon powder improves the high temperature resistance, wear resistance and oxidation resistance of the product; the formula ensures that the exothermic welding reaction is stable and the welding quality is improved. The potassium nitrate and the manganese nitrate can play a combustion-supporting role and cannot pollute the environment.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity;
s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Example 4:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride, silicon powder, potassium nitrate and manganese nitrate, and the ignition powder comprises magnesium powder; calculated by weight parts, 95 parts of copper oxide, 9 parts of aluminum powder, 0.45 part of magnesium powder, 0.5 part of calcium fluoride, 0.78 part of silicon powder, 0.25 part of potassium nitrate and 0.8 part of manganese nitrate. Wherein the grain size distribution of the copper oxide is 80 percent of 40-60 meshes, 19 percent of 60-80 meshes and less than or equal to 1 percent of the rest. The reaction speed of the copper oxide grain size distribution is moderate according to the proportion, the reaction is stable, and the density of the formed welding point is balanced and compact. Under the condition that the copper oxide and the aluminum powder are ignited, copper and aluminum oxide are generated through reaction, a large amount of heat is released, a welding body is welded, and the magnesium powder can be used as ignition powder; the calcium fluoride can be used as a cosolvent, can reduce the melting point of refractory substances, promotes the flow of material slag, and enables the material slag and metal to be well separated; the addition of the silicon powder improves the high temperature resistance, wear resistance and oxidation resistance of the product; the formula ensures that the exothermic welding reaction is stable and the welding quality is improved. The potassium nitrate and the manganese nitrate can play a combustion-supporting role and cannot pollute the environment.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity;
s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Example 5:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride, silicon powder, potassium nitrate and manganese nitrate, and the ignition powder comprises magnesium powder; calculated by weight parts, 95 parts of copper oxide, 9 parts of aluminum powder, 00.45 parts of magnesium powder, 0.35 part of calcium fluoride, 0.78 part of silicon powder, 0.25 part of potassium nitrate and 0.8 part of manganese nitrate. Wherein the grain size distribution of the copper oxide is 76-86% of 40-60 meshes, 12-22% of 60-80 meshes and less than or equal to 2% of the rest. The reaction speed of the copper oxide grain size distribution is moderate according to the proportion, the reaction is stable, and the density of the formed welding point is balanced and compact. Under the condition that the copper oxide and the aluminum powder are ignited, copper and aluminum oxide are generated through reaction, a large amount of heat is released, a welding body is welded, and the magnesium powder can be used as ignition powder; the calcium fluoride can be used as a cosolvent, can reduce the melting point of refractory substances, promotes the flow of material slag, and enables the material slag and metal to be well separated; the addition of the silicon powder improves the high temperature resistance, wear resistance and oxidation resistance of the product; the formula ensures that the exothermic welding reaction is stable and the welding quality is improved. The potassium nitrate and the manganese nitrate can play a combustion-supporting role and cannot pollute the environment.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: preheating a welding body to 150 ℃, then brushing off substances on the surface of the welding body, cleaning the inner cavity of a mold, and then putting the welding body into the welding cavity;
s4, discharging: a steel sheet is placed between the drainage channel and the solder cavity, a hollow tube with two open ends is placed in the solder cavity, one end of the hollow tube is placed on the steel sheet, welding powder is filled outside the hollow tube, ignition powder is filled in the hollow tube, the height of the welding powder is the same as that of the ignition powder, and the inner diameter of the hollow tube is 1/20 of the outer diameter of the welding powder. Then taking out the hollow pipe, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Example 6:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride, silicon powder, potassium nitrate and manganese nitrate, and the ignition powder comprises magnesium powder, red phosphorus, aluminum powder and copper oxide; 94 parts of copper oxide, 10.5 parts of aluminum powder, 0.15 part of magnesium powder, 0.5 part of calcium fluoride, 0.35 part of silicon powder, 0.35 part of potassium nitrate and 0.45 part of manganese nitrate in the welding powder. 2.15 parts of magnesium powder, 0.5 part of red phosphorus, 2 parts of aluminum powder and 0.2 part of copper oxide in the ignition powder.
Wherein the grain size distribution of the copper oxide accounts for 76 percent of 40-60 meshes, 22 percent of 60-80 meshes and the rest is 2 percent. The reaction speed of the copper oxide grain size distribution is moderate according to the proportion, the reaction is stable, and the density of the formed welding point is balanced and compact. Under the condition that the copper oxide and the aluminum powder are ignited, copper and aluminum oxide are generated through reaction, a large amount of heat is released, a welding body is welded, and the magnesium powder can be used as ignition powder; the calcium fluoride can be used as a cosolvent, can reduce the melting point of refractory substances, promotes the flow of material slag, and enables the material slag and metal to be well separated; the addition of the silicon powder improves the high temperature resistance, wear resistance and oxidation resistance of the product; the formula ensures that the exothermic welding reaction is stable and the welding quality is improved. The potassium nitrate and the manganese nitrate can play a combustion-supporting role and cannot pollute the environment.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: preheating a welding body to 170 ℃, then brushing off substances on the surface of the welding body, cleaning the inner cavity of a mold, and then putting the welding body into the welding cavity;
s4, discharging: a steel sheet is placed between the drainage channel and the solder cavity, a hollow tube with two open ends is placed in the solder cavity, one end of the hollow tube is placed on the steel sheet, welding powder is filled outside the hollow tube, ignition powder is filled in the hollow tube, the height of the welding powder is the same as that of the ignition powder, and the inner diameter of the hollow tube is 1/15 of the outer diameter of the welding powder. Then taking out the hollow pipe, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
The most preferred embodiment is as follows:
an exothermic welding agent and a welding method thereof comprise the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride, silicon powder, potassium nitrate and manganese nitrate, and the ignition powder comprises magnesium powder and red phosphorus; 94.5 parts of copper oxide, 9.5 parts of aluminum powder, 0.25 part of magnesium powder, 0.45 part of calcium fluoride, 0.52 part of silicon powder, 0.30 part of potassium nitrate, 0.55 part of manganese nitrate and 0.32 part of red phosphorus. Wherein the grain size distribution of the copper oxide is 80 percent of 40-60 meshes, 18 percent of 60-80 meshes and the rest is 2 percent. The reaction speed of the copper oxide grain size distribution is moderate according to the proportion, the reaction is stable, and the density of the formed welding point is balanced and compact. Under the condition that the copper oxide and the aluminum powder are ignited, copper and aluminum oxide are generated through reaction, a large amount of heat is released, a welding body is welded, and the magnesium powder can be used as ignition powder; the calcium fluoride can be used as a cosolvent, can reduce the melting point of refractory substances, promotes the flow of material slag, and enables the material slag and metal to be well separated; the addition of the silicon powder improves the high temperature resistance, wear resistance and oxidation resistance of the product; the formula ensures that the exothermic welding reaction is stable and the welding quality is improved. The potassium nitrate and the manganese nitrate can play a combustion-supporting role and cannot pollute the environment.
S2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: preheating a welding body to 150 ℃, then brushing off substances on the surface of the welding body, cleaning the inner cavity of a mold, and then putting the welding body into the welding cavity;
s4, discharging: a steel sheet is placed between the drainage channel and the solder cavity, a hollow tube with two open ends is placed in the solder cavity, one end of the hollow tube is placed on the steel sheet, welding powder is filled outside the hollow tube, ignition powder is filled in the hollow tube, the height of the welding powder is the same as that of the ignition powder, and the inner diameter of the hollow tube is 1/20 of the outer diameter of the welding powder. Then taking out the hollow pipe, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder; the ignition powder is formed like a drawing pin inserted into the welding powder, and after the ignition, the ignition is carried out from the upper surface of the welding powder and the inside of the welding powder, so that the reaction is rapidly diffused, and the reaction degree is more balanced.
S5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
Reference throughout this specification to multiple illustrative embodiments means that a particular method described in connection with the embodiments is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, while a method is described in connection with any one embodiment, it is to be understood that it is within the scope of the invention to implement such a method in connection with other embodiments.
Claims (5)
1. An exothermic solder welding method characterized by comprising: the method comprises the following steps:
s1, batching: the exothermic welding agent comprises welding powder and ignition powder; the welding powder comprises copper oxide, aluminum powder, calcium fluoride and silicon powder, and the ignition powder comprises magnesium powder;
s2 mold dehumidification: the inner cavity of the mould comprises a welding cavity and a solder cavity, and the welding cavity is connected with the solder cavity through a drainage channel to heat and dehumidify the inner cavity of the mould;
s3 cleaning: cleaning the inner cavity of the mold and the welding body, and then placing the welding body into the welding cavity;
s4, discharging: placing a steel sheet between the drainage channel and the solder cavity, placing a hollow tube with two open ends in the solder cavity, placing one end of the hollow tube on the steel sheet, filling welding powder outside the hollow tube, filling ignition powder in the hollow tube, wherein the height of the welding powder is the same as that of the ignition powder, then taking out the hollow tube, and laying a layer of ignition powder on the upper surfaces of the welding powder and the ignition powder;
s5 ignition: igniting the ignition powder for reaction welding, and taking out the welding part.
2. An exothermic solder welding method according to claim 1, wherein: the welding powder also comprises potassium nitrate and manganese nitrate.
3. An exothermic solder welding method according to claim 2, wherein: 94-95 parts of copper oxide, 9-10.5 parts of aluminum powder, 0.15-0.45 part of magnesium powder, 0.35-0.5 part of calcium fluoride, 0.35-0.78 part of silicon powder, 0.25-0.35 part of potassium nitrate and 0.45-0.8 part of manganese nitrate.
4. An exothermic solder welding method according to claim 1, wherein: in the step of S3 cleaning, the welding body is preheated to 140-170 ℃, and then the substances on the surface of the welding body are brushed off.
5. An exothermic solder welding method according to claim 1, wherein: the inner diameter of the hollow tube is 1/15-1/20 of the outer diameter of the welding powder.
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