CN102049625A - Heat release welding process for grounding electrode facility of power grid direct current engineering - Google Patents
Heat release welding process for grounding electrode facility of power grid direct current engineering Download PDFInfo
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- CN102049625A CN102049625A CN2010105471205A CN201010547120A CN102049625A CN 102049625 A CN102049625 A CN 102049625A CN 2010105471205 A CN2010105471205 A CN 2010105471205A CN 201010547120 A CN201010547120 A CN 201010547120A CN 102049625 A CN102049625 A CN 102049625A
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- rod iron
- grounding electrode
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Abstract
The invention relates to a heat release welding process for a grounding electrode facility of power grid direct current engineering, which is used for welding a grounding rod. The heat release welding process comprises the following steps of: carrying out cleaning, drying and deoxygenization treatment on the surface of the wending end part of a steel rod; then carrying out heating treatment on the welding end part and the adjacent part of the steel rod by a blow lamp; drying a die and removing steam by adopting a heating tool; installing the welding end part of the steel rod to the corresponding position of the die and ensuring the tightness of the contact surface of the die; and igniting for carrying out heat release welding. A welding head obtained by the heat release welding process for a grounding electrode facility of power grid direct current engineering has low resistivity and corrosion resistance. The heat release welding process improves the connecting process among grounding bodies of the traditional grounding system and integral engineering quality and overcomes the difficulty and defects of a grounding electrode feed rod in the welding construction to a great extent.
Description
Technical field
The invention belongs to the solder technology of electrical network DC engineering grounding electrode electric, be specifically related to a kind of heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility.
Background technology
Earthing pole is being taken on important role for the normal operation of whole DC transmission system in the HVDC transmission system, in power system, technical performances such as the bonding strength of earthed system, grounding resistance directly have influence on the security and the reliability of whole system, so the selection of earthed system and technology are extremely important in whole power system.The material of ground connection adopts steel usually in the domestic before direct current grounding pole earthed system, mostly be the mode of rod iron electric welding in form, this electric welding connected mode requires high to technical level of operators, processing quality control is difficult, and too high meeting causes declining to a great extent of straight-flow system operational reliability as the contact resistance of pad.
As adopt the heat release welding procedure that earthing material is welded, can improve processing quality greatly and reduce difficulty of construction.Heat release welding claims sweat soldering again, thereby is the purpose that the high-temperature molten metal conductor that utilizes the flux chemical reaction to produce reaches welding, and the method is a chemical reaction, speed is very fast, the heat that produces is high, can conduct to the welding position effectively, and its tie point is the molecule bonding connection method.The heat release welding procedure has following advantage:
1) current capacity of pad (fusing point) equates that with the current capacity of lead contact resistance value is little; Pad is welded, and is a kind of nonvolatil molecule combination, be difficult for getting loose, and be nonvolatil, be difficult for aging.
2) pad is not subjected to the influence of corrosion products as copper;
3) pad can stand big surge (fault) electric current of repeated multiple times and be difficult for degenerating;
4) welding method is simple and practical, and training is easy, and material for welding is very light, and is easy to carry;
When 5) welding, dispense with outer connecting power or thermal source;
6) from just verifying the quality of welding in appearance;
7) can be used for soldering copper, copper alloy, copper plated steel, various steel alloy and comprise stainless steel material.
But the external environment condition during owing to welding and the multiple factor of weld metal bar itself all can produce bigger influence to the sweat soldering quality, cause the welding position numerous cellular hole and pit can occur.In welding the solder joint slagging-off position residue that responds the time can take place also in addition and pile up and outer-flowing phenomenon, contact resistance stability and reliability that this has had a strong impact on pad cause shorten service life.
Summary of the invention
It is low to the invention provides a kind of plumb joint resistivity, the corrosion resistant heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility, it has improved the connection technology between traditional earthed system grounding body, improved whole construction quality, greatly the solution of degree difficulty and the defective of earthing pole feed rod in welding procedure.
The technical solution adopted in the present invention is as follows:
A kind of heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility is used for the welding of drop bar, it is characterized in that described heat release welding procedure comprises:
With the welding end surface of rod iron clean, dry and remove oxidation and handle;
Carry out heat treated to rod iron welding end with in abutting connection with the position with blowtorch then;
Adopt the heating tool drying die, drive away aqueous vapor;
The welding end of rod iron is placed in the relevant position of mould, and guarantees the adaptation of mould contact surface;
The heat release welding is carried out in igniting.
In the specific embodiment, described heat release welding procedure further comprises:
The welding ends portion of rod iron is polished the chamfering groove along girth respectively, and described bevel angle is the 25-35 degree, and described chamfering groove is evenly along the girth setting of rod iron welding ends.
In one embodiment, described welding end surface with rod iron cleans, step dry and that handle except that oxidation comprises:
Employing comprises that the cleaning agent of gasoline or alcohol cleans the welding end of rod iron, removes the greasy dirt of the welding end of rod iron;
The surface of welding end that to contain the rod iron of moisture adopts the butagas blowtorch to carry out heat treated;
With the cleaning, polish of the welding end of rod iron, remove oxide layer with metallic brush or emery wheel.
In another embodiment, described welding end surface with rod iron cleans, step dry and that handle except that oxidation further comprises:
The heating of butagas blowtorch is carried out in the welding end of the rod iron of length in the 30cm scope.
In the embodiment, described heat release welding procedure further comprises again:
The gap of reserving 0.8-1.2cm between the welding end of rod irons of two butt joints of mould will be put into.
In the another embodiment, described heat release welding procedure further comprises:
After the welding end with rod iron is placed in the relevant position of mould, adopt the aluminum pad as supporting body.
In addition, the step of described employing heating tool drying die comprises:
Use drying baker or blowtorch drying die, then with the surface of Flexible articles cleaning mold and the conductor that will connect, earthing pole.
This heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility adopts the method for multiple improvement welding surroundings and rod iron welding end condition, mould design, welding rod iron that welding is used carry out the multiple working procedure processing, have guaranteed the superior weldability energy of welding position.The heat release welding is the residue that produces liquid high temperature copper and aluminium oxide by the heat-producing chemical reaction of aluminium and cupric oxide, expect a perfect solder joint, and it is clean and dry that soldered rod iron must keep.Must remove the oil contamination on rod iron surface before the welding, use cleanings such as degreaser, gasoline, alcohol.The surface corrosion of rod iron welding position needs thoroughly to remove, and available brass wire brush cleaning totally also can be used the special grinding wheel polished surface.Remove oxide layer with steel brush after the blowtorch drying will be used in the rod iron surface of containing moisture content, otherwise the rod iron of moisture oil-containing such as direct welding copper liquid ejection mould can make reaction the time is abnormally dangerous.Preferably also need polish the groove about about 30 ° of angles in the welding ends portion of rod iron respectively uniformly along girth, to improve the quality of welding position; The chamfering groove can be circular groove or straight inclined-plane groove (looking the weldment cross sectional shape).Must use butagas blowtorch while heat treated about 15 minutes before the two ends 30cm length range inherence welding that rod iron need weld.In addition, need two of welding to dock the gap that must guarantee about 1cm between the rod irons; Quality of welding spot defective in the time of can more effectively eliminating the welding of major diameter rod iron like this.
The inventor is through repeatedly experiment, find because be subjected to moisture and steam in the surrounding environment, and there is the influence of dust, grease, oxide (rust) or other attachment etc. on the barred body surface that needs welding, and be used for the mould of weld metal body and dust, humidity arranged, the reason of other attachments and weldering body geometry is arranged, caused inner cellular hole and the pit of occurring of pad.Therefore need carry out strict cleaning to rod iron and mould, remove oxidation and dry the processing.And the welding agent proportioning is improper, and the not tight problem of die gap can cause reacted molten metal loss, thereby causes reaction not exclusively, therefore need carry out special design and sufficient cleaning for mould.Can use heating tool (as drying baker or blowtorch) drying die before use, drive away aqueous vapor.Untapped mould of a specified duration contains moisture, does not have the moistureproof mould of handling after especially last time using, and moisture is more.Conductive surfaces such as banister brush or other soft article cleaning mold and the lead that will connect, earthing pole, conductive surface have oxide, aqueous vapor or grease, adopt steel brush, blowtorch and cleaning agent to handle respectively, guarantee the cleaning and the drying of conductive surface.The conductor that will connect is placed in the relevant position of mould, checks the adaptation of mould contact surface, copper liquid leaks out from the slit when preventing operation; If the size that is fused thing is less than shown in the mould nameplate, can remedy with methods such as the copper sleeve of suitable thickness, sealant, the cotton bands of high temperature for avoiding copper liquid seepage.
Beneficial effect of the present invention is, the plumb joint resistivity that this heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility obtains is low, corrosion-resistant, this heat release welding procedure has improved the connection technology between traditional earthed system grounding body, improved whole construction quality, greatly the solution of degree difficulty and the defective of earthing pole feed rod in welding procedure.
The present invention is further elaborated below in conjunction with the specific embodiment.
The specific embodiment
This heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility can be used for the welding between drop bar and earth connection, and the main tool that it adopted has: weld mold, welding die clamp, welding powder, burning torch, hairbrush, steel brush, butagas blowtorch.
Use heating tool such as drying baker or blowtorch drying die before going into operation at every turn, drive away aqueous vapor, use banister brush or other soft article that mould is cleaned then, if the size that is fused thing less than shown in the mould nameplate, can remedy with the following method for avoiding copper liquid seepage: a) copper sleeve of use suitable thickness; B) use copper sheet or copper strips; C) use sealant; D) use the cotton band of high temperature.
With the Flexible articles cleaning mold and ask for the conductor of connection, the surface of earthing pole.
The rod iron of two ￠ 60 or other specifications, shape is carried out end-to-end heat release welding, and the welding ends radicals by which characters are arranged in traditional Chinese dictionaries of rod iron use cleanings such as degreaser, gasoline, four carbonoxides earlier, and the greasy dirt that still can't remove is adopted the polishing cleaning.Adopt brass wire brush or special grinding wheel polished surface then, the corrosion of clear welding end surface.Remove oxide layer with steel brush after will using the blowtorch drying for the rod iron surface of containing moisture; Welding ends portion with rod iron polish circular groove along girth respectively then, and the axial angle of described each circular groove and rod iron is the 25-35 degree, and circular groove is evenly along the girth setting of rod iron welding ends.This circle groove can also replace with straight beveled mouth.Heated simultaneously 15 minutes with the butagas blowtorch before the welding in the two ends 30cm length range that will need again to weld; Mould is put in the gaps of assurance 1cm between two butt joint rod irons that need weld, and carries pad with 6 conducts of conventional aluminium matter pad.
After conscientiously checking die clamp, die clamp is tightened mould, and adjust the folder distance repeatedly, be complementary, pour the corresponding dosage welding powder then into, and stay some pyrophoric powders on die lip, the closed die loam cake until die clamp adaptation and mould adaptation; If the folding of die clamp needs bigger dynamics, then the expression folder need be readjusted apart from not adjusting to the optimum position.With the pyrophoric powder igniting of burning torch towards die lip, the reaction of sweat soldering is promptly carried out in reaction chamber, and the heat release welding is finished.
Pad is carried out resistance test, and itself and rod iron are in full accord.Pad is cut observation, and this metal section is smooth, and contact is tight, no honeycomb, bubble.
The inventor is by carrying out practical application in Yi Min current conversion station earthing pole engineering to the sweat soldering technology, the preferable requirement of having satisfied the construction quality technological level, in DC engineering, promote this technology of employing for next step and opened the beginning, promoted this technology further developing in the power industry construction.
Claims (7)
1. a heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility is used for the welding of drop bar, it is characterized in that described heat release welding procedure comprises:
With the welding end surface of rod iron clean, dry and remove oxidation and handle;
Carry out heat treated to rod iron welding end with in abutting connection with the position with blowtorch then;
Adopt the heating tool drying die, drive away aqueous vapor;
The welding end of rod iron is placed in the relevant position of mould, and guarantees the adaptation of mould contact surface;
The heat release welding is carried out in igniting.
2. the heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility according to claim 1 is characterized in that described heat release welding procedure further comprises:
The welding ends portion of rod iron is polished the chamfering groove along girth respectively, and described bevel angle is the 25-35 degree, and described chamfering groove is evenly along the girth setting of rod iron welding ends.
3. the heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility according to claim 1 is characterized in that described welding end surface with rod iron cleans, step dry and that handle except that oxidation comprises:
Employing comprises that the cleaning agent of gasoline or alcohol cleans the welding end of rod iron, removes the greasy dirt of the welding end of rod iron;
The surface of welding end that to contain the rod iron of moisture adopts the butagas blowtorch to carry out heat treated;
With the cleaning, polish of the welding end of rod iron, remove oxide layer with metallic brush or emery wheel.
4. the heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility according to claim 3 is characterized in that described welding end surface with rod iron cleans, step dry and that handle except that oxidation further comprises:
The heating of butagas blowtorch is carried out in the welding end of the rod iron of length in the 30cm scope.
5. the heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility according to claim 1 is characterized in that described heat release welding procedure further comprises:
The gap of reserving 0.8-1.2cm between the welding end of rod irons of two butt joints of mould will be put into.
6. the heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility according to claim 1 is characterized in that described heat release welding procedure further comprises:
After the welding end with rod iron is placed in the relevant position of mould, adopt the aluminum pad as supporting body.
7. the heat release welding procedure that is used for electrical network DC engineering grounding electrode electric facility according to claim 1 is characterized in that the step of described employing heating tool drying die comprises:
Use drying baker or blowtorch drying die, then with the surface of Flexible articles cleaning mold and the conductor that will connect, earthing pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105471205A CN102049625A (en) | 2010-11-17 | 2010-11-17 | Heat release welding process for grounding electrode facility of power grid direct current engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105471205A CN102049625A (en) | 2010-11-17 | 2010-11-17 | Heat release welding process for grounding electrode facility of power grid direct current engineering |
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| CN102049625A true CN102049625A (en) | 2011-05-11 |
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| CN2010105471205A Pending CN102049625A (en) | 2010-11-17 | 2010-11-17 | Heat release welding process for grounding electrode facility of power grid direct current engineering |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106607648A (en) * | 2015-10-22 | 2017-05-03 | 五冶集团上海有限公司 | Fireclay fusion welding method for equipment shell grounding rods and grounding net |
| CN107127448A (en) * | 2017-05-18 | 2017-09-05 | 山东电力建设第工程公司 | A kind of power station fireclay welding copper ＆ brass mould, devices and methods therefor |
| CN107322157A (en) * | 2017-08-11 | 2017-11-07 | 山东电力建设第工程公司 | The exothermic welding method of ground wire in a kind of Amazon tropic rain forest |
| CN108666226A (en) * | 2018-05-29 | 2018-10-16 | 扬州乔恒电子有限公司 | The improved semiconductor rectifier bridge technological process of production |
| WO2019033223A1 (en) * | 2017-08-14 | 2019-02-21 | 山东电力建设第一工程公司 | Exothermic welding method for welding grounding wires in amazon rainforest |
-
2010
- 2010-11-17 CN CN2010105471205A patent/CN102049625A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106607648A (en) * | 2015-10-22 | 2017-05-03 | 五冶集团上海有限公司 | Fireclay fusion welding method for equipment shell grounding rods and grounding net |
| CN106607648B (en) * | 2015-10-22 | 2018-12-14 | 五冶集团上海有限公司 | A kind of fireclay welding method of equipment ground stick and grounded screen |
| CN107127448A (en) * | 2017-05-18 | 2017-09-05 | 山东电力建设第工程公司 | A kind of power station fireclay welding copper ＆ brass mould, devices and methods therefor |
| CN107322157A (en) * | 2017-08-11 | 2017-11-07 | 山东电力建设第工程公司 | The exothermic welding method of ground wire in a kind of Amazon tropic rain forest |
| CN107322157B (en) * | 2017-08-11 | 2019-08-20 | 山东电力建设第一工程公司 | A kind of exothermic welding method being grounded in Amazon tropic rain forest |
| WO2019033223A1 (en) * | 2017-08-14 | 2019-02-21 | 山东电力建设第一工程公司 | Exothermic welding method for welding grounding wires in amazon rainforest |
| CN108666226A (en) * | 2018-05-29 | 2018-10-16 | 扬州乔恒电子有限公司 | The improved semiconductor rectifier bridge technological process of production |
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Application publication date: 20110511 |