CN107322157A - The exothermic welding method of ground wire in a kind of Amazon tropic rain forest - Google Patents
The exothermic welding method of ground wire in a kind of Amazon tropic rain forest Download PDFInfo
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- CN107322157A CN107322157A CN201710684313.7A CN201710684313A CN107322157A CN 107322157 A CN107322157 A CN 107322157A CN 201710684313 A CN201710684313 A CN 201710684313A CN 107322157 A CN107322157 A CN 107322157A
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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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Abstract
The present invention relates to a kind of exothermic welding method of ground wire in Amazon tropic rain forest, comprise the following steps：Pincers are cut with circular arc the joint to be welded of ground wire joint is all whittled into the cone that cone angle is α；The joint to be welded of ground wire is stopped up with iron wire and dried；Joint to be welded is wiped with cotton gauze until removing oxide layer is completely exposed metallic luster；Joint to be welded is put into mould welding booth make plumb joint to be formed just pair with mould guiding gutter central outlet；Mould and joint to be welded are heated；Mould will integrally be heated again after mould matched moulds；The supporting spring of mould is placed on to the bottom of hot melt room；Appropriate welding powder pours into the hot melt room with scale mark, is spilled into a small amount of pyrophoric powder, the one end for rope of igniting is inserted in pyrophoric powder, the other end draws mould, the rope of igniting outside mould is lighted after fastening die cover；30 50s of cooling after having welded, open mould and take out plumb joint and to its dress watch, it is qualified after on plumb joint anticorrosion with painting paint.
Description
Technical field
The invention belongs to the welding technique of ground wire, and in particular to the welding side of ground wire in a kind of Amazon tropic rain forest
Method.
Background technology
Earthed system is mainly common galvanized strand wires from flexible ground line in Amazon tropic rain forest grounding construction.
The segmentation of flexible ground line is laid, and joint is more, and joint carries out bolt connection using generic connectivity gold utensil.Such a connected mode is not
Only cause flexible ground line can not robust connection, work progress center tap part zinc coat repeatedly worn and torn, and
Cause the accelerated corrosion in the moist environment of Amazon tropic rain forest of flexible ground line because junction portion is directly contacted with soil,
Greatly shorten earthed system service life, have a strong impact on earthed system safe and stable operation.
Therefore, this flexible ground line bolt connection technology, it is impossible to connect the ground wire robust of segmentation, it is conductive
Reliability is poor；Work progress center tap part zinc coat is vulnerable to abrasion, and junction portion is directly exposed to be contacted with soil, is made
The corrosion for accelerating earthed system in Amazon tropic rain forest wet environment is obtained, is unfavorable for earthed system safe and stable operation.Connect
Ground system service life shortens, and increases working strength of the later stage operation maintenance personnel to ground connection system maintenance, transformation, increase O＆M into
This.
In the prior art, the connection of ground wire or grounded screen also has one kind to be to use heat release welding technology, and heat release weldering is also referred to as chamotte
Thermofussion welding, is that two or more joints to be welded of ground wire are placed on to the hyperpyrexia produced in specific weld mould using chemical reaction
Can, fuse into one to form molecule combination at place to be welded, this technology welding effect in copper ground wire is preferable.On the one hand it is directed to
Different treats that welding end and weld mold put heat weldable welding powder consumption welding quality and have direct influence, on the other hand in such as sub- horse
In this high temperature, the adverse circumstances of high humility in inferior rainforest, galvanized strand wires plumb joint surface oxidation, corrosion rate are fast, institute
With at present be bolt connection.How to ensure heat release weldering normal construction and how to improve the machinery of the junction after welding by force
Degree and corrosion resistance are urgent problems to be solved in the prior art.
The content of the invention
In order to solve the above problems, the invention provides a kind of exothermic weld side of ground wire in Amazon tropic rain forest
Method, is greatly improved earthed system service life, and technique accurately and reliably, reduces the maintenance work to earthed system, reduces production
Cost.
The technical solution adopted by the present invention is as follows：
The exothermic welding method of ground wire, comprises the following steps in a kind of Amazon tropic rain forest：
S1, cut with circular arc pincers the joint to be welded of ground wire joint is all whittled into the cone that cone angle is α, the α is 50 °≤α
≤70°；
S2, with iron wire the joint to be welded of ground wire is stopped up, mould and joint to be welded are dried with flame gun, preheated
Processing；
S3, with cotton gauze joint to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint to be welded is put into mould welding booth make plumb joint to be formed just pair with mould guiding gutter central outlet；
S5, with flame gun mould and joint to be welded are heated；
S6, mould will integrally be heated again after mould matched moulds；
S7, by the supporting spring of mould be placed on hot melt room bottom block guiding gutter upper port；
S8, appropriate welding powder poured into the hot melt room with scale mark, be spilled into a small amount of pyrophoric powder, the one end for rope of igniting is inserted
In pyrophoric powder, the other end light rope of igniting outside mould after drawing mould, fastening die cover；
S9, welded after cooling 30-50s, open mould and take out plumb joint and to its dress watch, it is qualified after sprayed on plumb joint
Apply corrosion resistant coating.
In above-mentioned steps S5, when being heated to mould and joint to be welded, real time temperature measurement is carried out to both with infrared temperature measurement gun,
Ensure that both temperature are all not less than 165 DEG C and the state continues 18-30s；In above-mentioned steps S6, make when being heated after matched moulds outside mould
The temperature of wall is not less than 180 DEG C and continues 30-60s.
In above-mentioned steps S8, the consumption of the welding powder is [0.0089L π r2+1200 °/α] g, and wherein L is two groups to be welded
The total length and unit of head are mm, and r is ground wire radius and unit mm.
In above-mentioned steps S1, the conical joint length to be welded is the 1/3-1/2 of mould welding booth length；Above-mentioned step
In rapid S4, the group of the joint to be welded is 1-2mm to gap.
Beneficial effects of the present invention are：
Segmentation treats welding end, mould and is heated and control acid extraction, forms the copper-clad network with high mechanical properties
Connection, plumb joint outward appearance is in ellipticity, and processing quality is attractive in appearance；Implement to prove that on the one hand postwelding cooling a period of time contributes to welding
The oxide-film of head cooled and solidified and surface formation with corrosion-resisting function, has delayed corrosion of the ground wire in moist hot environment
Speed；On the other hand the plumb joint of high temperature can be avoided to contact vigorous reaction influence welding effect after steam in the environment of high humidity
Fruit even forms pit on surface；
Room graduation mark sign is heated, welding powder addition is accurately controlled by welding powder consumption formula, whole sweat soldering safe operation,
Efficiently；
Plumb joint is difficult relaxation, and welded joint does not have surface and residual stress, stable, reliable as grounded conductive body, after reduction
Phase Maintenance and Repair work, and greatly reduce production cost；
Plumb joint sprays the corrosion resistant coating made by two-part epoxy with gas tank, further the use longevity of extension earthed system
Life.
Brief description of the drawings
Fig. 1 is the mould structure schematic diagram used in exothermic welding method of the present invention,
In figure：1 is that die cover, 2 are hot melt room for rope of igniting, 3,4 are supporting spring, 5 are guiding gutter, 6 are welding booth, 7 are to be welded
Head.
Embodiment
The present invention relates to a kind of exothermic welding method of ground wire in Amazon tropic rain forest, comprise the following steps：
S1, circular arc cut pincers and the joint to be welded 7 of ground wire joint are all whittled into cone, and the conical joint to be welded 7 is grown
Spend for the 1/3-1/2 of the length of mould welding booth 6, the cone angle of the conical joint to be welded 7 is 50-70 °；
S2, with iron wire the joint to be welded 7 of ground wire is stopped up, mould and joint to be welded 7 dried, in advance with flame gun
Heat treatment；
S3, with cotton gauze joint 7 to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint 7 to be welded is put into mould welding booth 6 make plumb joint to be formed just pair with mould guiding gutter central outlet
Place, the group of the joint to be welded is 1-2mm to gap；
S5, with flame gun mould and joint to be welded are heated, real time temperature measurement is carried out to both with infrared temperature measurement gun, it is ensured that both
Temperature is all not less than 165 DEG C and continues 18-30s；
S6, mould will integrally be heated again after mould matched moulds, the temperature of outer mold wall is not less than 180 DEG C and is continued 30-60s；
S7, by the supporting spring 4 of mould be placed on hot melt room bottom block the upper port of guiding gutter 5；
S8, appropriate welding powder poured into the hot melt room 3 with scale mark, be spilled into a small amount of pyrophoric powder, the one end for rope 2 of igniting is inserted
Enter in pyrophoric powder, the other end draws mould, the rope 6 of igniting outside mould is lighted after fastening die cover 1；The consumption of the welding powder is
[0.0089L π r2+1200 °/α] g, wherein L is that the total length and unit of two groups of joints 7 to be welded are mm, r be ground wire radius and
Unit mm；
S9, welded after cooling 30-50s, open mould and take out plumb joint and to its dress watch, it is qualified after sprayed on plumb joint
Apply corrosion resistant coating.
Beautiful mountain ± 800kV the extra-high voltage direct-currents of first extra high voltage line engineering i.e. Brazil abroad built in China below
In work transmission line, further explained by each embodiment and the comparative example present invention.
All embodiments and comparative example are all that, using the weld part of 30 yi word patterns as object, pilot project is also to extract phase
With the sample of quantity.Embodiment 1 to 3 carries out constructing operation for the above-mentioned exothermic welding method provided using the present invention, it is specifically shown in
Each embodiment.On the premise of the welding surroundings ground wire equal with embodiment, comparative example 1 is to utilize existing general copper-clad copper
The exothermic welding method of welding carries out constructing operation, and comparative example 2 is to utilize bolt connection ground wire of the prior art.
Embodiment 1
S1,30 treated plumb joint 7 and be divided into three groups every group and treat plumb joint 7 for 10, pincers are cut with circular arc and dock three groups of ground wires
The joint to be welded 7 at place is whittled into the cone that cone angle is first group 50 °, second group 60 ° and the 3rd group 70 ° respectively, each to be welded
First 7 conus portion length is the 1/2 of the length of mould welding booth 6；
S2, with iron wire the joint to be welded 7 of ground wire is stopped up, mould and joint to be welded 7 dried, in advance with flame gun
Heat treatment；
S3, with cotton gauze joint 7 to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint 7 to be welded is put into mould welding booth 6 make plumb joint to be formed just pair with the central outlet of mould guiding gutter 5
Group between place, the joint 7 to be welded is 1-2mm to gap；
S5, with flame gun mould and joint to be welded 7 are heated, real time temperature measurement is carried out to both with infrared temperature measurement gun, it is ensured that two
Person's temperature at 200 DEG C or so and continue 18s；
S6, mould will integrally be heated again after mould matched moulds, the temperature for making outer mold wall is between 185-200 DEG C and continues 60s；
S7, by the supporting spring 4 of mould be placed on hot melt room 3 bottom block the upper port of guiding gutter 5；
S8, appropriate welding powder poured into the hot melt room 3 with scale mark, specific consumption is shown in Table lattice 1；It is spilled into and ignites on a small quantity afterwards
Powder, the one end for rope 2 of igniting is inserted in pyrophoric powder, the other end draws mould, the rope of igniting outside mould is lighted after fastening die cover 1
2；
S9, welded after three bond pads portions cool down 30s, 40s, 50s respectively, open mould and take out plumb joint and simultaneously clear up it inspection
Look into, the detection of technological effect is carried out according to the test parameters of form 1 and 2.
Embodiment 2
S1,30 treated plumb joint 7 and be all whittled into the cone that cone angle is 60 °, the conus portion length of each joint 7 to be welded is mould
The 1/2 of the length of welding booth 6；
S2, with iron wire the joint to be welded 7 of ground wire is stopped up, mould and joint to be welded 7 dried, in advance with flame gun
Heat treatment；
S3, with cotton gauze joint 7 to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint 7 to be welded is put into mould welding booth 6 make plumb joint to be formed just pair with the central outlet of mould guiding gutter 5
Group between place, the joint 7 to be welded is 1-2mm to gap；
S5, with flame gun mould and joint to be welded 7 are heated, real time temperature measurement is carried out to both with infrared temperature measurement gun, it is ensured that two
Person's temperature all between 180-190 DEG C and continue 25s；
S6, mould will integrally be heated again after mould matched moulds, the temperature for making outer mold wall is between 220-240 DEG C and continues 40s；
S7, by the supporting spring 4 of mould be placed on hot melt room 3 bottom block the upper port of guiding gutter 5；
S8, appropriate welding powder poured into the hot melt room 3 with scale mark, be spilled into a small amount of pyrophoric powder, the one end for rope 2 of igniting is inserted
Enter in pyrophoric powder, the other end draws mould, the rope 2 of igniting outside mould is lighted after fastening die cover 1；
S9, welded after cooling 40s, open mould and take out plumb joint and to its dress watch, joined according to the experiment of form 1 and 2
Number carries out the detection of technological effect.
Embodiment 3
S1,30 treated plumb joint and be whittled into the cone that cone angle is 60 °, the conus portion length of each joint 7 to be welded is mould weldering
Connect the 1/2 of the length of room 6；
S2, with iron wire the joint to be welded 7 of ground wire is stopped up, mould and joint to be welded 7 dried, in advance with flame gun
Heat treatment；
S3, with cotton gauze joint 7 to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint 7 to be welded is put into mould welding booth 6 make plumb joint to be formed just pair with the central outlet of mould guiding gutter 5
Group between place, the joint 7 to be welded is 1-2mm to gap；
S5, with flame gun mould and joint to be welded 7 are heated, real time temperature measurement is carried out to both with infrared temperature measurement gun, it is ensured that two
Person's temperature between 165-180 DEG C and continue 30s；
S6, mould will integrally be heated again after mould matched moulds, the temperature for making outer mold wall is between 300 DEG C and continues 30s；
S7, by the supporting spring 4 of mould be placed on hot melt room 3 bottom block the upper port of guiding gutter 5；
S8, appropriate welding powder poured into the hot melt room 3 with scale mark, be spilled into a small amount of pyrophoric powder, the one end for rope 2 of igniting is inserted
Enter in pyrophoric powder, the other end draws mould, the rope 2 of igniting outside mould is lighted after fastening die cover 1；
S9, welding cool down 50s respectively after having reacted, open mould and take out plumb joint and to its dress watch, according to form 1 and 2
Test parameters carry out technological effect detection.
Comparative example 1
S1,30 treated plumb joint and be whittled into the cone that cone angle is 60 °, the conus portion length of each joint 7 to be welded is mould weldering
Connect the 1/2 of the length of room 6；
S2, with iron wire the joint to be welded 7 of ground wire is stopped up, mould and joint to be welded 7 are carried out at drying with flame gun
Reason；
S3, with cotton gauze joint 7 to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint 7 to be welded is put into mould welding booth 6 make plumb joint to be formed just pair with the central outlet of mould guiding gutter 5
Group between place, the joint 7 to be welded is 1-2mm to gap；
S5, by the supporting spring 4 of mould be placed on hot melt room 3 bottom block the upper port of guiding gutter 5；
S6, appropriate welding powder poured into the hot melt room 3 with scale mark, be spilled into a small amount of pyrophoric powder, the one end for rope 2 of igniting is inserted
Enter in pyrophoric powder, the other end draws mould, the rope 2 of igniting outside mould is lighted after fastening die cover 1；
S7, welded after directly open mould and take out plumb joint and to its dress watch, entered according to the test parameters of form 1 and 2
The detection of row technological effect.
Comparative example 2
Attachment cap with holes is set using prior art in ground wire termination, and attachment cap is tightened with bolt makes ground wire connect each other
Connect.
Table 1 is the technological effect to weld part after the completion of welding：
| Project name | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 |
| It is grounded linear diameter （mm） | Φ9.52 | Φ9.52 | Φ9.52 | Φ9.52 | Φ9.52 |
| Joint 7 to be welded Cone angle | First group is 50 °, and second group is 60 °, the 3rd group is 70 ° | 60° | 60° | 60° | Nothing |
| Joint 7 to be welded Length L/2（mm） | 75 | 70 | 75 | 75 | Nothing |
| Welding powder consumption（g） | First group is 119, and second group is 115, the 3rd group is 112 | 109 | 115 | 120 | Nothing |
| Weld part resistance Rate changing value（* 10-3Ω·mm ²/m） | First group is ± 0.05, second Group is the -0.01 ~+0.02, the 3rd Group is ± 0.03 | ±0.01 | 0~+0.03 | -0.08~+0.10 | ±0.15 |
| Weld part appearance Face quality | Three groups are all the smooth solderless in surface Slag, without overlap, weld part is overall Uniformly, two ends radian is smooth | Surface is smooth without welding slag, solderless Knurl, weld part is overall uniform, Two ends radian is smooth | Non-welding surface slag, without overlap, weld part is overall Uniform two ends radian is smooth, centre is just to water conservancy diversion There is the pit of slight convex at groove 5 | Just to the weldering at guiding gutter 5 Connecing surface has obvious welding slag, Weld part two ends are thicker and energy See slight weld seam | Nothing |
| Weld part is transversal Face quality | Three visible section of bond pads portion bore holes Face has some size identicals small Bubble, and be uniformly distributed | Bore hole is visible only close to outer If having on the section at surface Dry minute bubbles and it is uniformly distributed | Bore hole is visible only in cutting close to outer surface There are some minute bubbles on face and be uniformly distributed, and And 4 on section at or so slight pit | Bore hole can see that section has not At uniform bubble and 4-7 Obvious pit | Nothing |
The weld part embedment underground normal ground that remaining not test (N.T.) cross section is destroyed works three months, and table 2 below is welding
Situation after the buried work in portion three months：
| Embodiment 1 | Embodiment 3 | Embodiment 3 | Comparative example 1 | Comparative example 2 | |
| Weld part resistivity Changing value（*10-3 Ω·mm²/m） | ±0.25 | ±0.12 | ±0.20 | ±1.00 | ±1.20 |
| Weld part outer surface Quality | The a small amount of rust staining in surface, after cleaning If there is lax distribution on surface Dry corrosion concave point | Surface substantially without rust staining, If there is lax distribution Dry corrosion concave point | The a small amount of rust staining in surface, after cleaning Surface has slightly more than embodiment 1 If dry corrosion concave point | Surface is completely covered by rust staining and rust staining is thick Spend the degree in 1-2mm, surface after cleaning A large amount of corrosion concave points | Bolt gets rusty sternly Weight, is backed out rear complete It is complete unrenewable |
| Whether weld part takes off Weldering | It is no | It is no | It is no | The two ends of weld part are to middle direction sealing-off Seriously | Attachment cap is with connecing Ground wire connection pine It is dynamic |
To mould and joint heating-up temperature to be welded, the consumption of welding powder, postwelding cool time etc. before above-mentioned Tables 1 and 2, weldering
Composite factor all has an impact to weld part quality and change in resistance.
Claims (4)
1. the exothermic welding method of ground wire in a kind of Amazon tropic rain forest, it is characterised in that comprise the following steps：
S1, cut with circular arc pincers the joint to be welded of ground wire joint is all whittled into the cone that cone angle is α, the α is 50 °≤α
≤70°；
S2, with iron wire the joint to be welded of ground wire is stopped up, mould and joint to be welded are dried with flame gun, preheated
Processing；
S3, with cotton gauze joint to be welded is wiped until removing oxide layer is completely exposed metallic luster, while cleaning out mould；
S4, joint to be welded is put into mould welding booth make plumb joint to be formed just pair with mould guiding gutter central outlet；
S5, with flame gun mould and joint to be welded are heated；
S6, mould will integrally be heated again after mould matched moulds；
S7, by the supporting spring of mould be placed on hot melt room bottom block guiding gutter upper port；
S8, appropriate welding powder poured into the hot melt room with scale mark, be spilled into a small amount of pyrophoric powder, the one end for rope of igniting is inserted
In pyrophoric powder, the other end light rope of igniting outside mould after drawing mould, fastening die cover；
S9, welded after cooling 30-50s, open mould and take out plumb joint and to its dress watch, it is qualified after sprayed on plumb joint
Apply corrosion resistant coating.
2. exothermic welding method according to claim 1, it is characterised in that：In above-mentioned steps S5, to mould and to be welded
During head heating, real time temperature measurement is carried out to both with infrared temperature measurement gun, it is ensured that both temperature are all not less than 165 DEG C and the state is held
Continuous 18-30s；In above-mentioned steps S6, the temperature of outer mold wall is set to be not less than 180 DEG C and continue 30-60s when being heated after matched moulds.
3. exothermic welding method according to claim 1, it is characterised in that：In above-mentioned steps S8, the consumption of the welding powder
It is mm for total length and unit that [0.0089L π r2+1200 °/α] g, wherein L is two groups of joints to be welded, r is ground wire radius
And unit mm.
4. exothermic welding method according to claim 1, it is characterised in that：In above-mentioned steps S1, described conical treats
Plumb joint length is the 1/3-1/2 of mould welding booth length；In above-mentioned steps S4, the group of the joint to be welded is 1- to gap
2mm。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN107322157B (en) | 2019-08-20 |
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