CN107322157B - A kind of exothermic welding method being grounded in Amazon tropic rain forest - Google Patents
A kind of exothermic welding method being grounded in Amazon tropic rain forest Download PDFInfo
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- CN107322157B CN107322157B CN201710684313.7A CN201710684313A CN107322157B CN 107322157 B CN107322157 B CN 107322157B CN 201710684313 A CN201710684313 A CN 201710684313A CN 107322157 B CN107322157 B CN 107322157B
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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
Abstract
The present invention relates to the exothermic welding method being grounded in a kind of Amazon tropic rain forest, include the following steps: that cutting pincers with circular arc is all whittled into the cone that cone angle is α for the connector to be welded being grounded at docking；The connector to be welded of ground line is stopped up with iron wire and is dried；Connector to be welded is wiped with cotton gauze until removing oxide layer is completely exposed metallic luster；Connector to be welded, which is put into mold welding booth, to be made at plumb joint face and mold diversion trench central outlet to be formed；Mold and connector to be welded are heated；Mold will integrally be heated again after mold clamping；The supporting spring of mold is placed on to the bottom of hot melt room；Suitable 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 into pyrophoric powder, other end extraction mold, and the rope of igniting outside mold is lighted after fastening die cover；Cooling 30-50s after having welded opens mold and takes 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 techniques of ground line, and in particular to the welding side being grounded in a kind of Amazon tropic rain forest
Method.
Background technique
Earthed system mainly selects the i.e. common galvanized strand wires of flexible ground line in Amazon tropic rain forest grounding construction.
The segmentation laying of flexible ground line, connector is more, and connector is bolted using generic connectivity fitting.Such connection type is not
Only cause flexible ground line can not robust connection, work progress center tap part zinc coat repeatedly worn, and
Since junction portion is directly contacted with soil so that the accelerated corrosion in the environment of Amazon tropic rain forest humidity of flexible ground line,
Greatly shorten earthed system service life, seriously affects earthed system safe and stable operation.
Therefore, this flexible ground line is bolted technology, can not connect the ground line robust of segmentation, conductive
Reliability is poor；Vulnerable to abrasion, junction portion is directly exposed to be contacted work progress center tap part zinc coat with soil, is made
The corrosion for accelerating earthed system in Amazon tropic rain forest wet environment is obtained, earthed system safe and stable operation is unfavorable for.It connects
Ground system reduced service life, increase later period operation maintenance personnel to ground connection system maintenance, transformation working strength, increase O&M at
This.
In the prior art, there are also one is with heat release welding technology, heat release weldering is also referred to as chamotte for the connection of ground line or grounded screen
Thermofussion welding is that two or more connectors to be welded of ground line are placed on the high fever generated in specific weld mold using chemical reaction
Can, it fuses into one to form molecule combination at place to be welded, this technology welding effect in copper ground line is preferable.On the one hand it is directed to
It is different to put heat weldable welding powder dosage welding quality to welding end and weld mold and have direct influence, on the other hand in such as sub- horse
This high temperature in inferior rainforest, in the adverse circumstances of high humility, galvanized strand wires plumb joint surface oxidation, corrosion rate are fast, institute
With at present be to be bolted.How to guarantee 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.
Summary of the invention
To solve the above-mentioned problems, the present invention provides the exothermic weld sides being grounded in a kind of Amazon tropic rain forest
Earthed system service life is greatly improved in method, and technique is accurate and reliable, reduces the maintenance work to earthed system, reduces production
Cost.
The technical solution adopted by the invention is as follows:
The exothermic welding method being grounded in a kind of Amazon tropic rain forest, includes the following steps:
S1, pincers are cut with circular arc the connector to be welded being grounded at docking is all whittled into the cone that cone angle is α, the α is 50 °
≤α≤70°；
S2, the connector to be welded of ground line is stopped up with iron wire, mold and connector to be welded are dried with flame gun,
The pre-heat treatment；
S3, connector to be welded is wiped with cotton gauze until removing oxide layer is completely exposed metallic luster, while cleaning out mould
Tool；
S4, connector to be welded is put into mold welding booth makes plumb joint face and mold diversion trench central outlet to be formed
Place；
S5, mold and connector to be welded are heated with flame gun；
S6, mold will integrally be heated again after mold clamping；
Diversion trench upper port is blocked in S7, the bottom that the supporting spring of mold is placed on to hot melt room；
S8, suitable welding powder is poured into the hot melt room with scale mark, is spilled into a small amount of pyrophoric powder, by the one end for rope of igniting
It is inserted into pyrophoric powder, other end extraction mold, the rope of igniting outside mold is lighted after fastening die cover；
S9, cooling 30-50s after having welded open mold and take out plumb joint and to its dress watch, it is qualified after in plumb joint
Upper anticorrosion with painting paint.
In above-mentioned steps S5, when heating to mold and connector to be welded, real time temperature measurement is carried out to the two with infrared temperature measurement gun,
Guarantee that the two temperature is all not less than 165 DEG C and the state continues 18-30s；In above-mentioned steps S6, make outside mold when being heated after molding
The temperature of wall is not less than 180 DEG C and continues 30-60s.
In above-mentioned steps S8, the dosage 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 line radius and unit mm.
In above-mentioned steps S1, the joint length to be welded of the cone is the 1/3-1/2 of mold welding booth length；Above-mentioned step
In rapid S4, the group of the connector to be welded is 1-2mm to gap.
The invention has the benefit that
Segmentation treats welding end, mold is heated and controls acid extraction, forms the copper with high mechanical strength
Envelope connection, plumb joint appearance are in ellipticity, and processing quality is beautiful；Implement to prove on the one hand postwelding cooling a period of time facilitates
Plumb joint cooled and solidified and surface formation have the oxidation film of corrosion-resisting function, have delayed ground line in moist hot environment
Corrosion rate；On the other hand vigorous reaction influences weldering after steam being contacted to avoid the plumb joint of high temperature in the big environment of humidity
It connects effect and even forms point on surface；
Room graduation mark mark is heated, welding powder additional amount, entire sweat soldering operation are accurately controlled by welding powder dosage formula
It is safe and efficient；
Plumb joint is not easy to relax, and welded joint does not have surface and residual stress, stable as grounded conductive body, reliable, subtracts
Few later maintenance service work, greatly reduction production cost；
Plumb joint sprays the anti-decaying paint made by two-part epoxy with gas tank, further extends the use of earthed system
Service life.
Detailed description of the invention
Fig. 1 is the mold structure diagram used in exothermic welding method of the present invention,
In figure: 1 be die cover, 2 for ignite rope, 3 be hot melt room, 4 be supporting spring, 5 be diversion trench, 6 be welding booth, 7 for
Plumb joint.
Specific embodiment
The present invention relates to the exothermic welding methods being grounded in a kind of Amazon tropic rain forest, include the following steps:
S1, circular arc cut pincers and the connector to be welded 7 being grounded at docking are all whittled into cone, the connector to be welded of the cone
7 length are the 1/3-1/2 of 6 length of mold welding booth, and the cone angle of the connector to be welded 7 of the cone is 50-70 °；
S2, the connector to be welded 7 of ground line is stopped up with iron wire, mold and connector to be welded 7 is dried with flame gun
Dry, the pre-heat treatment；
S3, it is completely exposed metallic luster until removing oxide layer with cotton gauze wiping connector 7 to be welded, while cleans out mould
Tool；
S4, connector 7 to be welded is put into mold welding booth 6 goes out plumb joint face and mold water conservancy diversion groove center to be formed
At mouthful, the group of the connector to be welded is 1-2mm to gap；
S5, mold and connector to be welded are heated with flame gun, real time temperature measurement is carried out to the two with infrared temperature measurement gun, is guaranteed
The two temperature is all not less than 165 DEG C and continues 18-30s；
S6, mold will integrally be heated again after mold clamping, make the temperature of outer mold wall not less than 180 DEG C and continues 30-
60s；
5 upper port of diversion trench is blocked in S7, the bottom that the supporting spring 4 of mold is placed on to hot melt room；
S8, suitable welding powder is poured into the hot melt room 3 with scale mark, is spilled into a small amount of pyrophoric powder, will ignite the one of rope 2
End is inserted into pyrophoric powder, the other end draws mold, and the rope 6 of igniting outside mold is lighted after fastening die cover 1；The dosage of the welding powder
For [0.0089L π r2+1200 °/α] g, wherein L is the total length of two groups of connectors 7 to be welded and unit is mm, and r is ground line radius
And unit mm；
S9, cooling 30-50s after having welded open mold and take out plumb joint and to its dress watch, it is qualified after in plumb joint
Upper anticorrosion with painting paint.
Beautiful mountain ± 800kV the extra-high voltage direct-current of the first extra high voltage line engineering built outside China sea below i.e. Brazil
In work transmission line, further explained by each embodiment and comparative example present invention.
All embodiment and comparative examples are all using the weld part of 30 "-" types as object, and pilot project is also to extract phase
With the sample of quantity.Embodiment 1 to 3 is to carry out constructing operation using above-mentioned exothermic welding method provided by the invention, is specifically shown in
Each embodiment.Under the premise of being grounded with the same welding surroundings of 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 be bolted ground line using in the prior art.
Embodiment 1
S1,30 are treated plumb joint 7 and is divided into three groups every group and treat plumb joint 7 for 10, cut pincers for three groups of ground lines with circular arc
It is first group 50 °, second group 60 ° and 70 ° of third group of cone that connector to be welded 7 at docking is whittled into cone angle respectively, each to
The conus portion length of plumb joint 7 is the 1/2 of 6 length of mold welding booth；
S2, the connector to be welded 7 of ground line is stopped up with iron wire, mold and connector to be welded 7 is dried with flame gun
Dry, the pre-heat treatment；
S3, it is completely exposed metallic luster until removing oxide layer with cotton gauze wiping connector 7 to be welded, while cleans out mould
Tool；
S4, connector 7 to be welded is put into mold welding booth 6 makes 5 center of plumb joint face and mold diversion trench to be formed
Exit, the group between the connector 7 to be welded is 1-2mm to gap；
S5, mold and connector to be welded 7 are heated with flame gun, real time temperature measurement is carried out to the two with infrared temperature measurement gun, is protected
Both cards temperature is at 200 DEG C or so and continues 18s；
S6, mold will integrally be heated again after mold clamping, made between 185-200 DEG C of temperature of outer mold wall and continued
60s；
5 upper port of diversion trench is blocked in S7, the bottom that the supporting spring 4 of mold is placed on to hot melt room 3；
S8, suitable welding powder is poured into the hot melt room 3 with scale mark, specific dosage is shown in Table lattice 1；It is spilled into later a small amount of
The one end for rope 2 of igniting is inserted into pyrophoric powder, other end extraction mold, lights drawing outside mold after fastening die cover 1 by pyrophoric powder
Fiery rope 2；
S9, rear three group welding portions cooling 30s, 40s, 50s respectively have been welded, has opened mold taking-up plumb joint and simultaneously it is cleared up
It checks, the detection of technological effect is carried out according to the test parameters of table 1 and 2.
Embodiment 2
S1, to treat plumb joint 7 by 30 to be all whittled into cone angle be 60 ° of cone, and the conus portion length of each connector 7 to be welded is
The 1/2 of 6 length of mold welding booth；
S2, the connector to be welded 7 of ground line is stopped up with iron wire, mold and connector to be welded 7 is dried with flame gun
Dry, the pre-heat treatment；
S3, it is completely exposed metallic luster until removing oxide layer with cotton gauze wiping connector 7 to be welded, while cleans out mould
Tool；
S4, connector 7 to be welded is put into mold welding booth 6 makes 5 center of plumb joint face and mold diversion trench to be formed
Exit, the group between the connector 7 to be welded is 1-2mm to gap；
S5, mold and connector to be welded 7 are heated with flame gun, real time temperature measurement is carried out to the two with infrared temperature measurement gun, is protected
Both cards temperature is all between 180-190 DEG C and continues 25s；
S6, mold will integrally be heated again after mold clamping, made between 220-240 DEG C of temperature of outer mold wall and continued
40s；
5 upper port of diversion trench is blocked in S7, the bottom that the supporting spring 4 of mold is placed on to hot melt room 3；
S8, suitable welding powder is poured into the hot melt room 3 with scale mark, is spilled into a small amount of pyrophoric powder, will ignite the one of rope 2
End is inserted into pyrophoric powder, the other end draws mold, and the rope 2 of igniting outside mold is lighted after fastening die cover 1；
S9, cooling 40s after having welded, opening mold takes out plumb joint and to its dress watch, according to the examination of table 1 and 2
Test the detection that parameter carries out technological effect.
Embodiment 3
S1, to treat plumb joint by 30 to be whittled into cone angle be 60 ° of cone, and the conus portion length of each connector 7 to be welded is mould
Has the 1/2 of 6 length of welding booth；
S2, the connector to be welded 7 of ground line is stopped up with iron wire, mold and connector to be welded 7 is dried with flame gun
Dry, the pre-heat treatment；
S3, it is completely exposed metallic luster until removing oxide layer with cotton gauze wiping connector 7 to be welded, while cleans out mould
Tool；
S4, connector 7 to be welded is put into mold welding booth 6 makes 5 center of plumb joint face and mold diversion trench to be formed
Exit, the group between the connector 7 to be welded is 1-2mm to gap；
S5, mold and connector to be welded 7 are heated with flame gun, real time temperature measurement is carried out to the two with infrared temperature measurement gun, is protected
Both cards temperature is between 165-180 DEG C and continues 30s；
S6, mold will integrally be heated again after mold clamping, make between 300 DEG C of temperature of outer mold wall and continues 30s；
5 upper port of diversion trench is blocked in S7, the bottom that the supporting spring 4 of mold is placed on to hot melt room 3；
S8, suitable welding powder is poured into the hot melt room 3 with scale mark, is spilled into a small amount of pyrophoric powder, will ignite the one of rope 2
End is inserted into pyrophoric powder, the other end draws mold, and the rope 2 of igniting outside mold is lighted after fastening die cover 1；
S9, welding cool down 50s respectively after having reacted, opening mold takes out plumb joint and to its dress watch, according to table 1
Test parameters with 2 carries out the detection of technological effect.
Comparative example 1
S1, to treat plumb joint by 30 to be whittled into cone angle be 60 ° of cone, and the conus portion length of each connector 7 to be welded is mould
Has the 1/2 of 6 length of welding booth；
S2, the connector to be welded 7 of ground line is stopped up with iron wire, mold and connector to be welded 7 is dried with flame gun
Dry-cure；
S3, it is completely exposed metallic luster until removing oxide layer with cotton gauze wiping connector 7 to be welded, while cleans out mould
Tool；
S4, connector 7 to be welded is put into mold welding booth 6 makes 5 center of plumb joint face and mold diversion trench to be formed
Exit, the group between the connector 7 to be welded is 1-2mm to gap；
5 upper port of diversion trench is blocked in S5, the bottom that the supporting spring 4 of mold is placed on to hot melt room 3；
S6, suitable welding powder is poured into the hot melt room 3 with scale mark, is spilled into a small amount of pyrophoric powder, will ignite the one of rope 2
End is inserted into pyrophoric powder, the other end draws mold, and the rope 2 of igniting outside mold is lighted after fastening die cover 1；
S7, mold is directly opened after having welded take out plumb joint and to its dress watch, joined according to the test of table 1 and 2
Number carries out the detection of technological effect.
Comparative example 2
Attachment cap with holes is set in ground line end using the prior art, tightening attachment cap with bolt makes ground line each other
Connection.
Table 1 is the technological effect after the completion of welding to weld part:
| 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 |
| The cone angle of connector 7 to be welded | First group is 50 °, and second group is 60 °, the Three groups are 70 ° | 60° | 60° | 60° | Nothing |
| The length of connector 7 to be welded L/2(mm) | 75 | 70 | 75 | 75 | Nothing |
| Welding powder dosage (g) | First group is 119, and second group is 115, the Three groups are 112 | 109 | 115 | 120 | Nothing |
| Weld part resistivity becomes Change value (* 10-3Ω· Mm2/m) | First group be ± 0.05, second group for- 0.01 ~+0.02, third group is ± 0.03 | ±0.01 | 0~+0.03 | -0.08~+0.10 | ±0.15 |
| Weld part outer surface matter Amount | Three groups are all the smooth no welding slag in surface, solderless Tumor, whole uniform, the both ends radian of weld part Smoothly | The smooth no welding slag in surface, without overlap, weldering Socket part is whole uniformly, both ends radian is smooth | Non-welding surface slag, without overlap, the whole uniformly both ends arc of weld part There are the fiber crops of slight convex at smooth, the intermediate face diversion trench 5 of degree Point | Face of weld at face diversion trench 5 has bright Aobvious welding slag, weld part both ends are thicker and can see To slight weld seam | Nothing |
| Weld cross section matter Amount | If the visible section of three group welding portion naked eyes has The dry identical minute bubbles of size, and uniformly divide Cloth | Naked eye is visible only close to outer surface Section on have several minute bubbles and Even distribution | Naked eye it is visible only close to outer surface section on have it is several Minute bubbles and be uniformly distributed, and 4 on section at or so it is light Micro- point | Naked eye can see that there is non-uniform gas in section Bubble and apparent point at 4-7 | 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
Situation after the buried work of weld part three months:
| Embodiment 1 | Embodiment 3 | Embodiment 3 | Comparative example 1 | Comparative example 2 | |
| Weld part change in resistance value (* 10-3Ω 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, cleaning rear surface have If the dry corrosion concave point of lax distribution | Surface without rust staining, has lax substantially If the dry corrosion concave point of distribution | The a small amount of rust staining in surface, cleaning rear surface have ratio If the slightly more dry corrosion concave point of embodiment 1 | Surface is completely covered by rust staining and rust staining thickness is in 1-2mm Degree, cleaning rear surface largely corrode concave point | Bolt gets rusty seriously, twists It completely can not be again after lower With |
| Weld part whether desoldering | It is no | It is no | It is no | The both ends of weld part are serious to intermediate direction desoldering | Attachment cap and ground line Connection loosens |
By above-mentioned Tables 1 and 2 as it can be seen that when being cooled down before weldering to mold and connector heating temperature to be welded, the dosage of welding powder, postwelding
Between etc. composite factors all have an impact to weld part quality and change in resistance.
Claims (3)
1. the exothermic welding method being grounded in a kind of Amazon tropic rain forest, which comprises the steps of:
S1, pincers are cut with circular arc the connector to be welded being grounded at docking is all whittled into the cone that cone angle is α, the α is 50 °≤α
≤70°；
S2, the connector to be welded of ground line is stopped up with iron wire, mold and connector to be welded is dried with flame gun, preheated
Processing；
S3, connector to be welded is wiped with cotton gauze until removing oxide layer is completely exposed metallic luster, while cleaning out mold；
S4, connector to be welded is put into mold welding booth makes at plumb joint face and mold diversion trench central outlet to be formed；
S5, mold and connector to be welded are heated with flame gun；
S6, mold will integrally be heated again after mold clamping；
Diversion trench upper port is blocked in S7, the bottom that the supporting spring of mold is placed on to hot melt room；
S8, suitable welding powder is poured 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 into
In pyrophoric powder, the other end draw mold, light rope of igniting outside mold after fastening die cover；The dosage of the welding powder is
[0.0089L π r2+1200 °/α] g, wherein L is the total length of two groups of connectors to be welded and unit is mm, r be ground line radius and
Unit is mm；
S9, cooling 30-50s after having welded, opening mold take out plumb joint and to its dress watch, spray on plumb joint after qualified
Apply anti-decaying paint.
2. exothermic welding method according to claim 1, it is characterised in that: in above-mentioned steps S5, to mold and to be welded
When head heating, real time temperature measurement is carried out to the two with infrared temperature measurement gun, guarantees that the two temperature is all not less than 165 DEG C and the state is held
Continuous 18-30s；In above-mentioned steps S6, makes the temperature of outer mold wall not less than 180 DEG C when heating after molding and continue 30-60s.
3. exothermic welding method according to claim 1, it is characterised in that: in above-mentioned steps S1, it is described cone to
Plumb joint length is the 1/3-1/2 of mold welding booth length；In above-mentioned steps S4, the group of the connector to be welded is 1- to gap
2mm。
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