CN101920365B - A kind of low-temperature welding method of galvanized steel grounding network - Google Patents
A kind of low-temperature welding method of galvanized steel grounding network Download PDFInfo
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- CN101920365B CN101920365B CN201010254773.4A CN201010254773A CN101920365B CN 101920365 B CN101920365 B CN 101920365B CN 201010254773 A CN201010254773 A CN 201010254773A CN 101920365 B CN101920365 B CN 101920365B
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- solder
- brazing flux
- galvanized steel
- joint
- backing plate
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- 238000003466 welding Methods 0.000 title claims abstract description 60
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 51
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005219 brazing Methods 0.000 claims abstract description 54
- 229910052751 metal Inorganic materials 0.000 claims abstract description 51
- 239000002184 metal Substances 0.000 claims abstract description 51
- 239000011701 zinc Substances 0.000 claims abstract description 50
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 48
- 230000004907 flux Effects 0.000 claims abstract description 44
- 229910000679 solder Inorganic materials 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000000155 melt Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 150000002739 metals Chemical class 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000008187 granular material Substances 0.000 claims description 27
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 14
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 14
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 14
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 235000011164 potassium chloride Nutrition 0.000 claims description 7
- 239000001103 potassium chloride Substances 0.000 claims description 7
- 235000003270 potassium fluoride Nutrition 0.000 claims description 7
- 239000011698 potassium fluoride Substances 0.000 claims description 7
- 235000005074 zinc chloride Nutrition 0.000 claims description 7
- 239000011592 zinc chloride Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000005476 soldering Methods 0.000 description 6
- 238000012876 topography Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 241000222065 Lycoperdon Species 0.000 description 1
- 241000768494 Polymorphum Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
Abstract
The present invention relates to a kind of low-temperature welding method of galvanized steel grounding network, it is characterised in that comprise the following steps: 1) the front preparation of weldering: take zinc-coated flat steel sheet mother metal two, two mother metals are overlapped, remove the impurity at faying surface；The side of overlap joint mother metal is left gap, and opposite side is in close contact；Leaving gap location at lap joint and place a backing plate, backing plate is in close proximity to overlapping by mother metal；Brazing flux homogeneous reactor is placed at backing plate, then solder is pressed close to joint and places, dispense on brazing flux, on solder, finally stack one layer of brazing flux again；2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter lap gap, and subsequently after brazing filler metal melts, solder liquid carries out calking；3) cooling: after solder is full of gap, stops heating, places natural cooling.The method is simple to operate, can be effectively improved joint metal corrosion resistance, increase jam-tolerant rush of current safety, be applicable to remote districts, field construction, joint course of reaction, be in low temperature, it is not necessary to high temperature heat source.
Description
[technical field]
The present invention relates to metal welding methods, specifically, relate to a kind of low-temperature welding method of galvanized steel grounding network.
[background technology]
Grounding device is very important link in project of transmitting and converting electricity, and its construction quality is not only related to great in electrical network setting
Standby operation safety, is also related to the personal safety of operation power personnel.As the material of grounded screen application, at present at me
What state was most widely used is galvanized steel and copper grounding grid, and wherein galvanized steel occupies ground connection field more than 90% especially.
China's commonly used hot-galvanized steel its reason of earthing material is as follows:
One is due to the copper stock number of China less (copper grounding grid is only applied to some key projects at home), it is difficult to wide
General application copper grounding grid.
Two be the technical system of China based on the technical system of the former Soviet Union, the former Soviet Union is widely used plating on earthing material
Zinc Steel material, what western countries' generation at the same time was the most more applies copper earthing material.
Three is that galvanized steel is cheap, has good economy.
During China's galvanized steel of more than 60 year uses, from the point of view of Ge Wangsheng company excavation situation, galvanized steel piecing devices
Corrosion be one of principal mode of causing grounded screen to lose efficacy.Galvanized steel is primarily present problems with:
One is that it is high in basic soil area corrosion rate, and service life is low, and partial alkaline area grounded screen is for ensureing safety
Within even 1 year, i.e. need excavation maintenance；And in acid and neutral soil area, galvanized steel has similar with copper grounding grid resistance to
Corrosivity.
Two are, galvanized steel be connected to the widely used arc welding of China, during welding, be parallel to taking of mother metal length direction
Connecing welding at interface edge, fusion length is more than twice band steel width or six times of round steel diameters, and the contact of joint mother metal is line
Contact, and often due in welding process workman lack a sense of responsibility or technical merit problem, welding quality is difficult to ensure that, this
Result in joint connection resistance bigger.Additionally arc welding mother metal in welding process melts, and high temperature causes the heat of welding position
The zone of influence is big, and joint mother metal tissue is thick and zinc coat destroys completely, and joint is at sour corrosion environment and earth current
Easily corrode under effect.
For the galvanized steel ground grid of domestic extensive application, for ensureing to run safety, State Grid Corporation of China is at 18 electrical networks
Great anti-accident measures requiring, the grounded screen excavation time limit was less than 5 years.
In sum, galvanized steel ground grid will continue to use in earthed system within one period, but its joint is even
Intrinsic problem in termination process should solve.The connection using soldering tech to carry out galvanized steel earthing material then can improve
The performance of original joint, improves grounded screen service life.
Soldering is a kind of to utilize the filler metal (referred to as solder) that fusing point is lower than mother metal, after heated fusing, utilizes liquid pricker
Material moistening mother metal, fill play movement and with mother metal phase counterdiffusion, it is achieved the welding method of connection.Brazing deformation is little, connects
Head smooth and beautiful appearance, is suitable for the component that welding is accurate, complicated and is made up of different materials, and mother metal is due to the capillary of solder
The face that act as connects, and contact resistance is little, is suitable for the connection of prominent electric property component.Therefore soldering processes are applied to ground connection
The connection of net has great advantage.
[summary of the invention]
Present invention aims to the drawbacks described above that prior art exists, it is provided that a kind of galvanized steel ground grid soldered
Method, with overcome above-mentioned galvanized steel ground grid present in the conventional arc weldering mode welding process not enough；Thus reduce and connect
Head resistivity, raising corrosion resistance.A kind of low-temperature welding method of galvanized steel grounding network that the present invention provides, the method operation letter
Single, can be effectively improved joint metal corrosion resistance, increase the safety of jam-tolerant rush of current, to be applicable to field inclined
The construction of remote area, joint are in low temperature in course of reaction, it is not necessary to high temperature heat source.
A kind of low-temperature welding method of galvanized steel grounding network that the present invention provides, comprises the following steps:
1) prepare before weldering: take galvanized steel mother metal two, two mother metals are overlapped, remove the impurity at faying surface；To take
Gap is left in the side connecing mother metal, and opposite side is in close contact；Leaving gap location at lap joint and place a backing plate, backing plate is tight
Close by overlap joint mother metal；Brazing flux homogeneous reactor is placed at backing plate, then solder is pressed close to joint and places, dispense in brazing flux
On, on solder, finally stack one layer of brazing flux again；
2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter and take
Seam gap, subsequently after brazing filler metal melts, solder liquid carries out calking；
3) cooling: after solder is full of gap, stops heating, places natural cooling.
The first preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, described backing plate is ceramic backing.
The second preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, described solder is diameter of 1 mm-3 mm rule
Lattice zinc granule.
The present invention provide the 3rd preferred low-temperature welding method of galvanized steel grounding network, described solder be diameter 1mm, 2mm and
3mm specification zinc granule.
The 4th preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, described zinc granule purity is 99%-100%.
The 5th preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, described brazing flux is commercially available zinc chloride, chlorine
Change lithium, potassium chloride, the mixing brazing flux of potassium fluoride preparation.
The 6th preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, the monolateral gap between described galvanized steel is
0.1-0.3mm。
The 7th preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, described backing plate is identical with galvanized steel thickness
Or backing plate is slightly above galvanized steel, to ensure that fusing solder flows from backing plate side to galvanized steel side.
The 8th preferred low-temperature welding method of galvanized steel grounding network that the present invention provides, described heated coupling preheating device is card
Formula gas tank and flame gun.
Mechanical means is used to remove the impurity such as the greasy dirt at faying surface；Solder zinc granule is the commercially available zinc granule bought；Brazing flux is city
Selling zinc chloride, lithium chloride, potassium chloride, the mixing brazing flux of potassium fluoride preparation, its mass ratio is formula known in the industry,
LiCl24%, KCl15.7%, ZnCl258%, KF2.3%；The backing plate used can not for Fe sill, in order to avoid solder with
Backing plate reacts.
Galvanized steel material carries out soldering and is equally applicable the lap joint that DL/T 621 recommends, solid-state solder is filled
On the overlap joint coincidence face of mother metal, by the heating of thermal source, brazing filler metal melts, under the common effect of brazing flux, solder wetting
Mother metal, fills up gap, makes mother metal that metallurgical binding is fully achieved.
Specifying according to DL/T 621, the permission temperature in short-term of steel earthing material is not to be exceeded 400 DEG C, therefore weld metal is on active service
Temperature should be higher than that 400 DEG C.
The solder of above-mentioned employing is graininess zinc granule solder, and its melting temperature is 420 degrees Celsius, when solder and mother metal matrix
After reacting, ferrum spreads in zinc layers, rapidly transforms into Fe solid solution in Zn or intermetallic compound, reaction
The fusing point of product drastically raises according to Fe-Zn binary phase diagraml.By this process, welding process is at low temperature (extremely
Close to service temperature) under occur, and the service temperature of joint metal is more than 500 DEG C；Ensure that soldered,
The feature of high-temperature service.
Compared with prior art, a kind of low-temperature welding method of galvanized steel grounding network that the present invention provides, have following useful
Effect
1, corrosion resistance good due to brazing temperature low, less than mother metal fusing point, thus welding in heat affected area little, for mother metal group
Knitting impact little, will not occur thick tissue near weld metal, this just alleviates and welds the shadow for former mother metal performance
Ring, improve the corrosion resistance of joint metal.
2, resistivity is low connects owing to joint is connected as face, rather than the three of arc welding weld lines connect, therefore the plating of soldering
It is lower that zinc steel joint connects resistance, thus adds the safety of failure-resilient rush of current.
3, field welding protection good due to welding material simple, it is only necessary to solder and scaling powder；Welding equipment is the lightest,
Only need flame gun and cassette gas cylinder, it is not necessary to heavy auxiliary equipment, (needing the electric welding machine of heaviness, power supply etc. such as arc welding)
Therefore, soldering is used to be particularly well-suited to the construction of remote districts, field.
4, soldered high-temperature service joint is in low temperature in course of reaction, it is not necessary to high temperature heat source, and postwelding is formed and connects
Head fusion temperature is far above welding temperature.
[accompanying drawing explanation]
Fig. 1 is: the storeroom position relationship structure in a kind of low-temperature welding method of galvanized steel grounding network that the present invention provides is shown
It is intended to.
In figure: 1, zinc-coated flat steel sheet；2, monolateral gap；3, zinc granule；4, backing plate.
[detailed description of the invention]
Illustrate below in conjunction with accompanying drawing and detailed description of the invention, a kind of galvanized steel ground grid soldered side that the present invention is provided
Method does further more detailed description.
[embodiment 1]
The low-temperature welding method of galvanized steel grounding network of the present embodiment, comprises the following steps:
1) prepare before weldering: take two pieces of zinc-coated flat steel sheet mother metals, utilize mechanical means to remove the impurity such as the greasy dirt at faying surface；Purchase
Buy commercially available zinc granule, sieve, choose diameter 1mm specification zinc granule as solder；Buy commercially available zinc chloride, lithium chloride,
The mixing brazing flux of potassium chloride, potassium fluoride preparation；As shown in Figure 1: with clearance gauge by between two pieces of zinc-coated flat steel sheet mother metals
Gap is maintained at 2mm, and another side is in close contact, and leaves gap location at lap joint and places a zinc-coated flat steel sheet more slightly higher than backing plate,
To ensure that fusing solder flows from backing plate side to zinc-coated flat steel sheet side, brazing flux homogeneous reactor is placed at backing plate, then by zinc
Grain is pressed close to joint and is placed, and dispenses on brazing flux, finally stacks one layer of brazing flux on zinc granule again.
2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter and take
Seam gap, subsequently after brazing filler metal melts, solder liquid carries out calking；
3) cooling: after zinc granule liquation is full of gap, stops heating, places natural cooling.
The welding effect of the low-temperature welding method of galvanized steel grounding network that the present embodiment uses: add gap complete, surface topography is ash
Color, the porosity is 3%.
[embodiment 2]
The low-temperature welding method of galvanized steel grounding network of the present embodiment, comprises the following steps:
1) prepare before weldering: take two pieces of zinc-coated flat steel sheet mother metals, utilize mechanical means to remove the impurity such as the greasy dirt at faying surface；Purchase
Buy commercially available zinc granule, sieve, choose diameter 2mm specification zinc granule as solder；Buy commercially available zinc chloride, lithium chloride,
The mixing brazing flux of potassium chloride, potassium fluoride preparation；As shown in Figure 1: with clearance gauge by between two pieces of zinc-coated flat steel sheet mother metals
Gap is maintained at 0.3mm, and another side is in close contact, and leaves gap location placement one and zinc-coated flat steel sheet uniform thickness pottery at lap joint
Backing plate, is placed at backing plate by brazing flux homogeneous reactor, then zinc granule is pressed close to joint and places, dispense on brazing flux, finally at zinc
One layer of brazing flux is stacked again on grain.
2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter and take
Seam gap, subsequently after brazing filler metal melts, solder liquid carries out calking；
3) cooling: after zinc granule liquation is full of gap, stops heating, places natural cooling.
The welding effect of the low-temperature welding method of galvanized steel grounding network that the present embodiment uses: adding gap relatively complete, surface topography is
Lycoperdon polymorphum Vitt, the porosity is 6%.
[embodiment 3]
The low-temperature welding method of galvanized steel grounding network of the present embodiment, comprises the following steps:
1) prepare before weldering: take two pieces of zinc-coated flat steel sheet mother metals, utilize mechanical means to remove the impurity such as the greasy dirt at faying surface；Purchase
Buy commercially available zinc granule, sieve, choose diameter 3mm specification zinc granule as solder；Buy commercially available zinc chloride, lithium chloride,
The mixing brazing flux of potassium chloride, potassium fluoride preparation；With clearance gauge, the gap, one side between two pieces of zinc-coated flat steel sheet mother metals is maintained at
0.1mm, another side is in close contact, and leaves gap location placement one and galvanized steel uniform thickness ceramic backing at lap joint, by pricker
Agent homogeneous reactor is placed at backing plate, then zinc granule is pressed close to joint and places, dispense on brazing flux, finally stack on zinc granule again
One layer of brazing flux.
2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter and take
Seam gap, subsequently after brazing filler metal melts, solder liquid carries out calking；
3) cooling: after zinc granule liquation is full of gap, stops heating, places natural cooling.
The welding effect of the low-temperature welding method of galvanized steel grounding network that the present embodiment uses: adding gap relatively complete, surface topography is
Dull gray, the porosity is 6%.
[embodiment 4]
The low-temperature welding method of galvanized steel grounding network of the present embodiment, comprises the following steps:
1) prepare before weldering: take two pieces of zinc-coated flat steel sheet mother metals, utilize mechanical means to remove the impurity such as the greasy dirt at faying surface；Purchase
Buy commercially available zinc granule, sieve, choose diameter 1mm specification zinc granule as solder；Buy commercially available zinc chloride, lithium chloride,
The mixing brazing flux of potassium chloride, potassium fluoride preparation；With clearance gauge, the gap, one side between two pieces of zinc-coated flat steel sheet mother metals is maintained at
0.2mm, another side is in close contact, and leaves gap location placement one and zinc-coated flat steel sheet equal thickness ceramic backing at lap joint,
Brazing flux homogeneous reactor is placed at backing plate, then zinc granule is pressed close to joint and places, dispense on brazing flux, finally zinc granule on again
Stack one layer of brazing flux.
2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter and take
Seam gap, subsequently after brazing filler metal melts, solder liquid carries out calking；
3) cooling: after zinc granule liquation is full of gap, stops heating, places natural cooling.
The welding effect of the low-temperature welding method of galvanized steel grounding network that the present embodiment uses: add gap complete, surface topography is ash
Color, the porosity is 3%.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although with reference to above-mentioned reality
Executing example to be described in detail the present invention, those of ordinary skill in the field are it is understood that technical staff reads present specification
After still the detailed description of the invention of the present invention can be modified or equivalent, but these amendment or change all without departing from Shen of the present invention
Please be within accompanying claims protection domain.
Claims (4)
1. a low-temperature welding method of galvanized steel grounding network, comprises the following steps:
1) prepare before weldering: take zinc-coated flat steel sheet mother metal two, two mother metals are overlapped, remove the impurity at faying surface；Will
Gap is left in the side of overlap joint mother metal, and opposite side is in close contact；Leave gap location at lap joint and place a backing plate, backing plate
By overlap joint mother metal；Brazing flux homogeneous reactor is placed at backing plate, then solder is pressed close to joint and places, dispense in pricker
In agent, on solder, finally stack one layer of brazing flux again；
2) welding: heat lap joint, after brazing flux melts, due to capillarity, brazing flux liquid can enter and take
Seam gap, subsequently after brazing filler metal melts, solder liquid carries out calking；Welding process occurs at low temperature 420 DEG C,
And the service temperature of joint metal is more than 500 DEG C；
3) cooling: after solder is full of gap, stops heating, places natural cooling；
Described heated coupling preheating device is cassette gas tank and flame gun；
Described backing plate is ceramic backing；
Described solder is diameter 2mm specification zinc granule；
Monolateral gap between described galvanized steel is 0.3mm.
Welding method the most according to claim 1, it is characterised in that described zinc granule purity is 99%-100%.
Welding method the most according to claim 1, it is characterised in that described brazing flux be commercially available zinc chloride, lithium chloride,
The mixing brazing flux of potassium chloride, potassium fluoride preparation.
Welding method the most according to claim 1, it is characterised in that described backing plate is identical with galvanized steel thickness or backing plate
Slightly above galvanized steel, to ensure that fusing solder flows from backing plate side to galvanized steel side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010254773.4A CN101920365B (en) | 2010-08-16 | 2010-08-16 | A kind of low-temperature welding method of galvanized steel grounding network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010254773.4A CN101920365B (en) | 2010-08-16 | 2010-08-16 | A kind of low-temperature welding method of galvanized steel grounding network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101920365A CN101920365A (en) | 2010-12-22 |
| CN101920365B true CN101920365B (en) | 2016-08-10 |
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| CN201010254773.4A Active CN101920365B (en) | 2010-08-16 | 2010-08-16 | A kind of low-temperature welding method of galvanized steel grounding network |
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| CN115415624B (en) * | 2022-08-23 | 2024-05-28 | 中车青岛四方机车车辆股份有限公司 | Braze welding sealing method, spot welding structure and railway vehicle |
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| JPH0732136A (en) * | 1993-07-13 | 1995-02-03 | Ohbayashi Corp | Joining method of magnetic plate in electromagnetic shield room |
| JP2004082212A (en) * | 2002-07-01 | 2004-03-18 | Mitsui Mining & Smelting Co Ltd | Tin-silver-based lead-free solder |
| JP4640995B2 (en) * | 2006-03-17 | 2011-03-02 | 株式会社神戸製鋼所 | Steel plate for brazing joint with aluminum material, joining method and joint using the steel plate |
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