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Preparation method of exothermic welding powder for grounding grid

An exothermic welding and grounding mesh technology, applied in the field of welding powder, can solve the problems of splashing, porosity and slag inclusion in joints, unfavorable safety of welding personnel, etc., and achieve the effect of high safety, high cost performance and low porosity.

Active Publication Date: 2017-08-08
日照大正焊接材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: In view of the spattering phenomenon of exothermic welding powder produced in China during the welding process, which is not conducive to the safety of welding personnel, and the problems of pores and slag inclusions inside the joint, the present invention uses isopropyl Aluminum alkoxide is evenly dispersed in isopropanol, the pH is adjusted by nitric acid solution to obtain aluminum sol, and then copper oxide and surfactant are added to it to activate and modify it to make copper oxide and aluminum more uniformly mixed, and then use poly Ethylene glycol is used as a carrier to make aluminum and copper adsorb and combine through silane coupling agent, and at the same time increase silicon element to obtain copper-aluminum crystals through freezing treatment, then add platinum to increase the welding effect, and finally mix with fluorite powder to reduce the melting point. Through melting and atomization, the exothermic welding solder powder for grounding grid is prepared

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] According to the mass ratio of 1:6, put aluminum isopropoxide and isopropanol into a container, place the container in an ultrasonic oscillator, vibrate at 1.5MHz for 20min, then put the container into a water bath, and use a mass fraction of 50% nitric acid solution to adjust the pH to 3.5, set the temperature to 70°C, and stir at 160r / min for 2h; Copper oxide with 20% aluminum isopropoxide mass and vinyl tri-tert-butylperoxysilane with 5% aluminum isopropoxide mass are heated up to 80°C and stirred at 200r / min for 20min; Put the mixture into a high-pressure reactor, add polyethylene glycol with a mass of 10% of the mixture into the reactor, use hydrogen protection, and increase the pressure to 1.3MPa, raise the temperature to 210°C at 9°C / min, and stir at 110r / min 7h, then naturally cooled to room temperature, and discharged, using a mass fraction of 20% sodium hydroxide solution to adjust the pH of the discharged product to neutrality, and then placed the discharged ...

example 2

[0022]According to the mass ratio of 1:6, put aluminum isopropoxide and isopropanol into a container, place the container in an ultrasonic oscillator, vibrate at 2.0MHz for 30min, then put the container into a water bath, and use a mass fraction of 50% nitric acid solution to adjust the pH to 4.0, set the temperature to 75°C, and stir at 160r / min for 3h; Copper oxide with 25% aluminum isopropoxide mass and vinyl tri-tert-butylperoxysilane with 7% aluminum isopropoxide mass are heated up to 85°C and stirred at 200r / min for 25min; Put the mixture into a high-pressure reactor, add polyethylene glycol with a mass of 15% of the mixture into the reactor, use hydrogen protection, and increase the pressure to 2.3MPa, raise the temperature to 220°C at 9°C / min, and stir at 110r / min 9h, then naturally cooled to room temperature, and discharged, using a mass fraction of 20% sodium hydroxide solution to adjust the pH of the discharged product to neutrality, and then placed the discharged p...

example 3

[0025] According to the mass ratio of 1:6, put aluminum isopropoxide and isopropanol into a container, place the container in an ultrasonic oscillator, vibrate at 1.8MHz for 25min, then put the container into a water bath, and use a mass fraction of 50% nitric acid solution to adjust the pH to 3.8, set the temperature to 72°C, and stir at 160r / min for 2h; Copper oxide with 23% aluminum isopropoxide mass and vinyl tri-tert-butylperoxysilane with 6% aluminum isopropoxide mass are heated up to 83°C and stirred at 200r / min for 23min; Put the mixture into a high-pressure reactor, add polyethylene glycol with a mass of 13% of the mixture into the reactor, use hydrogen protection, and increase the pressure to 1.8MPa, raise the temperature to 215°C at 9°C / min, and stir at 110r / min 8h, then naturally cooled to room temperature, and discharged, using a mass fraction of 20% sodium hydroxide solution to adjust the pH of the discharged material to neutrality, and then placed the discharged...

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Abstract

The invention relates to a preparation method of an exothermic welding powder for a grounding grid, and belongs to the technical field of welding powder. The preparation method aims to solve the problems that exothermic welding powder currently produced domestically splashes in the welding process, which influences the welding personnel safety, and pores and slag exist in joints. According to the preparation method, aluminum isopropoxide is evenly dispersed in isopropanol, pH is adjusted through a nitric acid solution, alumina sol is obtained, then copper oxide and a surfactant are added for activation modification so that the copper oxide and aluminum are mixed more evenly, polyethylene glycol is used as a carrier, aluminum and copper are subjected to adsorption combination through a silane coupling agent, meanwhile, silicon elements are added, copper-aluminum crystals are obtained through freezing treatment, the welding effect is improved by adding platinum for assisting, finally, materials are mixed with fluorite powder for lowering the melting point, and the exothermic welding powder for the grounding grid is prepared through fusion and atomizing. The exothermic welding powder for the grounding grid is free of splashing phenomenon in the welding process, and pores and slag do not exist in the joints.

Description

technical field [0001] The invention relates to a method for preparing exothermic welding powder for grounding grids, and belongs to the technical field of welding powder. Background technique [0002] The substation grounding grid is an essential facility for working grounding, protective grounding and lightning protection grounding, and is an important link to ensure equipment, system and personal safety. important role. For a long time, due to the low requirements on the electrical performance of the grounding system, when steel is used as the grounding conductor, the connection process between conductors often uses methods such as resistance welding, brazing, and electrode arc welding. Due to the influence of human factors, these welding methods cause unstable joint quality, damage to the welding base metal by welding itself, and corrosion of the joint by acid or alkali in the soil, etc., which cannot make the grounding system maintain efficient and long-term stable ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K23/00
CPCB23K23/00
Inventor 何迎春宋昊
Owner 日照大正焊接材料有限公司
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