CN105108281A - Welding process for oil pipe of main transformer of electric locomotive - Google Patents
Welding process for oil pipe of main transformer of electric locomotive Download PDFInfo
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- CN105108281A CN105108281A CN201510542245.1A CN201510542245A CN105108281A CN 105108281 A CN105108281 A CN 105108281A CN 201510542245 A CN201510542245 A CN 201510542245A CN 105108281 A CN105108281 A CN 105108281A
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- main transformer
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- 238000003466 welding Methods 0.000 title claims abstract description 211
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 30
- 229910052786 argon Inorganic materials 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 229910000679 solder Inorganic materials 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 5
- 238000003032 molecular docking Methods 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- 229910001651 emery Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 abstract 3
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 3
- 230000002688 persistence Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/00—Arc welding or cutting
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding process for an oil pipe of a main transformer of an electric locomotive. The process includes the steps of firstly, preparation performed before welding, secondly, positioned welding, thirdly, installed welding including pipe butt joint installed welding and installed welding of the pipe and a flange, fourthly, weld joint check and treatment, and fifthly water pressure test. According to the different positions of weld joints, different welding modes and different welding parameters are adopted for different connecting materials and different working environments. The pipe welded according to the specific requirements of the process is free of leakage, no leakage phenomenon exists even after loading operation, the sealing durability of the welding joints is good, the functionality of the main transformer is guaranteed, the operation of the locomotive is guaranteed, and waste of manpower, material resources and financial resources caused by rework is avoided as well. Meanwhile, the process is verified through practice and can be popularized to pipe welding processes of oil pipes of main transformers of electric locomotives of different projects and the popularization effect is good.
Description
Technical field
The present invention relates to pipeline welding technology, be specifically related to a kind of electric locomotive main transformer oil pipe welding procedure.
Background technology
Electric locomotive is configured with main transformer usually, main transformer compresses into row reduced output voltage to net, maintain in normal operating temperature range for making main transformer, usually some oil circuit pipings are connected in hull outside, the mode of forced guidance oil circulated air cooling is adopted to cool, the connection of pipeline adopts the form of flange group welding connection, the air-tightness quality of pipeline directly affects the performance of main transformer, if pipeline produces leakage phenomenon, can have an impact to oil stream and cooling effect, oil stream is detected lower than standard value or oil temperature higher than standard value once oil flow relay or oil temperature sensor, main transformer power stage will be caused to stop, the operation of locomotive is impacted, the cold oil revealed also brings certain potential safety hazard.
Existing technical scheme is performed the welding procedure of the welding of main transformer oil pipe according to conventional oil water lines such as locomotive machine oil, fuel oil and cooling water systems, argon arc welding together with docking assembly welding between pipeline with pipeline adopts, the Type of Welding of argon arc welding together with the inner side and outer side weld seam between flange with pipeline all adopts.
There is certain shortcoming in existing scheme: carries out the water pressure test on request carry out the pipe fitting assembly welding welded by this technique after, there is no leakage phenomenon, weld seam sealing is good, but after entrucking after locomotive operation a period of time, there is Seepage in indivedual pipeline, prove that the weld seam sealing that this is undertaken welding by former technique does not have persistence, be not exclusively applicable to the welding of main transformer cold oil pipeline; After there is seepage, oiling and the welding equipment of specialty can only be transported, and professional welding personnel need be sent to do over again, bring unnecessary human and material resources, the waste of financial resources.
Therefore, need to adopt a kind of perfect welding procedure, ensure that the weldquality of main fransformer oil water lines is good to guarantee the air-tightness of pipeline.
Summary of the invention
Technical problem solved by the invention is the not good problem of electric locomotive main transformer oil pipe weld seam sealing persistence, the pipeline entrucking that the water pressure test can be avoided to be up to the standards after locomotive operation, the leakage phenomenon of generation.
The technical solution used in the present invention is, electric locomotive main transformer oil pipe welding procedure, and its step is as follows:
The first step, prepare before welding, by carbon steel property of medicine welding rod oven for drying, temperature is set as 75 DEG C-150 DEG C, and during welding, environment temperature is higher than 5 DEG C, removes the impurity in about 20mm region, weld seam both sides;
Second step, tack welding,
Tack welding carries out on jig, determines the location dimension of pipe fitting, adopts electric arc welding mode, and solder joint is circumferentially being uniformly distributed, after welding, butt welding point carries out polishing, leveling, the welding rod model of tack welding is E4303, and core diameter is 3.2mm, and welding current is direct current 90-130A;
3rd step, assembly welding, first pipeline joint assembly welding, the then assembly welding of pipeline and flange,
1) pipeline joint assembly welding, lower end pipe carries out docking assembly welding with upper pipes, one end of welding is needed to do chamfered lower end pipe, upper pipes, during welding, first weld seam adopts twice argon arc welding welding manner to weld, welding position is that half way up the mountain upwards welds, and ensures that surface, every layer of solder design place is round and smooth;
2) assembly welding of pipeline and flange, flange and lower end pipe carry out assembly welding, lower end pipe is done chamfered with one end of flange welding, during welding, take first to weld the 3rd weld seam, the order of rear weldering second weld seam, the 3rd weld seam adopts argon arc welding welding manner, and weld seam 2 adopts carbon dioxide gas arc welding welding manner;
4th step, welding inspection and process, after full weld, butt welded seam checks, weld seam has not allowed crackle, pore, slag inclusion, incomplete tusion, undercut, pit and do not filled up defect, as defectiveness must polish after again weld, with flat chisel or emery wheel by weld seam and eliminating impurities around, guarantee appearance of weld is attractive in appearance, even width, excessively round and smooth with mother metal;
5th step, the water pressure test, the pipe fitting after welding carries out the water pressure test of 1000kPa, continues 5 minutes, ensures No leakage and emit globule phenomenon, as hydraulic pressure finds to leak, release must thoroughly remove repair welding on request again after former defect.
Baking oven adopts far-infrared self-controlling to dry the dual-purpose baking oven of insulation.
The solder joint of tack welding is no less than 3 places.
Twice argon arc welding welding is divided into first to weld and second welding, the welding wire model of twice welding is ER50-6, and gage of wire is 1.2mm, and gas flow is 5-8L/min, the welding current of first welding is direct current 120-160A, and the welding current of second welding is 120-140A.
Twice argon arc welding welding adopts TIG Welding Machine.
The welding wire model that 3rd weld seam and the second weld seam adopt is: ER50-6, gage of wire is 1.2mm, weldingvoltage is 20-22V, 3rd weld seam welding current is direct current 120-160A, gas flow is 5-8L/mi, second weld seam welding current is direct current 140-180A, and gas flow is 10-15L/min.
3rd step assembly welding, also can the assembly welding of first pipeline and flange, then pipeline joint assembly welding.
The invention has the beneficial effects as follows, electric locomotive main transformer oil pipe welding procedure, the position different according to weld seam, different connection materials, different working environments adopt different welding manners, welding parameter, by the pipe fitting that the specific requirement of this technique is welded, No leakage phenomenon, after loading operation, does not have Seepage to occur yet, weld seam sealing persistence is good, ensure that the functional of main transformer, ensured the operation of locomotive, the human and material resources that it also avoid does over again brings, the waste of financial resources; Meanwhile, this technique has obtained the checking put into practice, can be generalized in the pipe fitting welding technique of the electric locomotive main transformer oil pipe of disparity items, has good popularizing action.
Accompanying drawing explanation
Fig. 1 is electric locomotive main transformer oil pipe welding procedure first weld seam of the present invention and the second position while welding figure.
Fig. 2 is electric locomotive main transformer oil pipe welding procedure the 3rd position while welding figure of the present invention.
Mark in figure: 1, flange, 2, lower end pipe, 3, upper pipes, the 4, first weld seam, the 5, second weld seam, the 6, the 3rd weld seam.
Detailed description of the invention
Now 1 to accompanying drawing 2 by reference to the accompanying drawings, the present invention is further illustrated: the present invention mainly adopts new welding procedure to the weld seam between pipe fitting, main transformer cold oil pipeline is primarily of flange and pipeline composition, pipeline adopts the form of welding to connect, what welding comprised pipeline and pipeline docks assembly welding, assembly welding between pipeline and flange, the structure of pipeline and position while welding are see Fig. 1, Fig. 2, and technique particular content is as follows:
The main setting specification from welding manner selection, each welding parameter, postwelding welding inspection and the aspect such as process, the water pressure test are illustrated, and concrete technology flow process is: welds prepares-tack welding-pipe fitting assembly welding-weld seam process-water pressure test.
The first step, welds prepares;
1) the electric welding carbon steel property of medicine used welding rod oven for drying, temperature is set as 75 DEG C-150 DEG C, adopts equipment: far-infrared self-controlling dries the dual-purpose baking oven of insulation;
2) during welding, environment temperature must higher than 5 DEG C;
3) impurity such as oil, water can weld after should be removed in about 20mm region in weld seam both sides.
Second step, tack welding;
For ensureing welding quality and welding precision, before pipe fitting assembly welding, first must implement tack welding, tack welding requires to carry out on jig, and ensures the location dimension of pipe fitting, adopt electric arc welding mode, and solder joint is circumferentially being uniformly distributed, and be no less than 3 places, after welding, butt welding point carries out polishing, leveling, to ensure welding quality.Tack welding design parameter is as follows: welding rod model is E4303, and core diameter is 3.2mm, and welding current is direct current 90-130A, and tack welding welding equipment is chosen as follows: jig, silicon rectifier electric welder.
3rd step, assembly welding; Assembly welding is divided into the assembly welding of pipeline joint assembly welding and pipeline and flange.
1) pipeline joint assembly welding, as shown in Figure 1, lower end pipe 2 carries out docking assembly welding with upper pipes 3, the one end of welding is needed to do chamfered, during welding, to the weld seam between pipeline i.e. the first weld seam 4 lower end pipe 2, upper pipes 3, twice argon arc welding welding manner is adopted to weld, welding position is that half way up the mountain upwards welds, and ensures that surface, every layer of solder design place is round and smooth, and TIG Welding Machine chosen by welding equipment.
The design parameter of twice argon arc welding welding is as follows:
The welding wire model of first argon arc welding is ER50-6, and gage of wire is 1.2mm, and welding current is direct current 120-160A, and gas flow is 5-8L/min;
The welding wire model of second argon arc welding is ER50-6, and gage of wire is 1.2mm, and welding current is direct current 120-140A, and gas flow is 5-8L/min.
2) assembly welding of pipeline and flange; as shown in Figure 1 and Figure 2; flange 1 and lower end pipe 2 carry out assembly welding; lower end pipe 2 is done chamfered with one end of welding of flange 1, during welding, takes first to weld weld joint on inner side i.e. the 3rd weld seam 6; the outer side weld i.e. order of the second weld seam 5 of rear weldering; 3rd weld seam 6 adopts argon arc welding welding manner, and the second weld seam 5 adopts carbon dioxide gas arc welding welding manner, and design parameter is as follows:
The welding wire model that weld seam 3 adopts is ER50-6, and gage of wire is 1.2mm, and welding current is direct current 120-160A, and weldingvoltage is 20-22V, gas flow: 5-8L/min.The welding wire model that weld seam 2 adopts is ER50-6, and gage of wire is 1.2mm, and welding current is direct current 140-180A, and weldingvoltage is 20-22V, and gas flow is 10-15L/min.
Welding equipment is wire feeder, TIG Welding Machine, carbon dioxide electric welding machine.
4th step, welding inspection and process, after full weld, butt welded seam checks, weld seam has not allowed crackle, pore, slag inclusion, incomplete tusion, undercut, pit and the defect such as not to have filled up, again weld after as occurred, defect must be polished, weld seam and surrounding do not allow to there are the foreign material such as splashing, must remove with the instrument such as flat chisel or emery wheel.Weld seam requires beautiful appearance, and even width is excessively round and smooth with mother metal.
5th step, the water pressure test, the pipe fitting after welding carries out the water pressure test of 1000kPa to check welding quality, continue 5 minutes, do not allowed leak and emit globule phenomenon, when hydraulic pressure finds to leak, forbid welding with pressure, release must thoroughly remove repair welding on request again after former defect.
In electric locomotive main transformer cold oil pipeline pipe fitting welding process, must carry out in strict accordance with the specific requirement of above-mentioned technique, each flow process is except the assembly welding docking assembly welding and pipeline and flange between pipeline, outside the two order can be selected arbitrarily, the sequencing of all the other flow processs can not be put upside down, after the assay was approved, can entrucking assembling.
Claims (7)
1. electric locomotive main transformer oil pipe welding procedure, is characterized in that: its step is as follows:
The first step, prepare before welding, by carbon steel property of medicine welding rod oven for drying, temperature is set as 75 DEG C-150 DEG C, and during welding, environment temperature is higher than 5 DEG C, removes the impurity in about 20mm region, weld seam both sides;
Second step, tack welding,
Tack welding carries out on jig, determines the location dimension of pipe fitting, adopts electric arc welding mode, and solder joint is circumferentially being uniformly distributed, after welding, butt welding point carries out polishing, leveling, the welding rod model of tack welding is E4303, and core diameter is 3.2mm, and welding current is direct current 90-130A;
3rd step, assembly welding, first pipeline joint assembly welding, the then assembly welding of pipeline and flange,
1) pipeline joint assembly welding, lower end pipe carries out docking assembly welding with upper pipes, one end of welding is needed to do chamfered lower end pipe, upper pipes, during welding, first weld seam adopts twice argon arc welding welding manner to weld, welding position is that half way up the mountain upwards welds, and ensures that surface, every layer of solder design place is round and smooth;
2) assembly welding of pipeline and flange, flange and lower end pipe carry out assembly welding, lower end pipe is done chamfered with one end of flange welding, during welding, take first to weld the 3rd weld seam, the order of rear weldering second weld seam, the 3rd weld seam adopts argon arc welding welding manner, and weld seam 2 adopts carbon dioxide gas arc welding welding manner;
4th step, welding inspection and process, after full weld, butt welded seam checks, weld seam has not allowed crackle, pore, slag inclusion, incomplete tusion, undercut, pit and do not filled up defect, as defectiveness must polish after again weld, with flat chisel or emery wheel by weld seam and eliminating impurities around, guarantee appearance of weld is attractive in appearance, even width, excessively round and smooth with mother metal;
5th step, the water pressure test, the pipe fitting after welding carries out the water pressure test of 1000kPa, continues 5 minutes, ensures No leakage and emit globule phenomenon, as hydraulic pressure finds to leak, release must thoroughly remove repair welding on request again after former defect.
2. electric locomotive main transformer oil pipe welding procedure according to claim 1, is characterized in that: described baking oven adopts far-infrared self-controlling to dry the dual-purpose baking oven of insulation.
3. electric locomotive main transformer oil pipe welding procedure according to claim 1, is characterized in that: the solder joint of described tack welding is no less than 3 places.
4. electric locomotive main transformer oil pipe welding procedure according to claim 1, it is characterized in that: described twice argon arc welding welding is divided into first to weld and second welding, the welding wire model of twice welding is ER50-6, gage of wire is 1.2mm, gas flow is 5-8L/min, the welding current of first welding is direct current 120-160A, and the welding current of second welding is 120-140A.
5. electric locomotive main transformer oil pipe welding procedure according to claim 4, is characterized in that: described twice argon arc welding welding adopts TIG Welding Machine.
6. electric locomotive main transformer oil pipe welding procedure according to claim 1, it is characterized in that: the welding wire model that the 3rd described weld seam and the second weld seam adopt is: ER50-6, gage of wire is 1.2mm, weldingvoltage is 20-22V, 3rd weld seam welding current is direct current 120-160A, gas flow is 5-8L/mi, and the second weld seam welding current is direct current 140-180A, and gas flow is 10-15L/min.
7. electric locomotive main transformer oil pipe welding procedure according to claim 1, is characterized in that: the 3rd described step assembly welding, also can the assembly welding of first pipeline and flange, then pipeline joint assembly welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510542245.1A CN105108281A (en) | 2015-08-29 | 2015-08-29 | Welding process for oil pipe of main transformer of electric locomotive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510542245.1A CN105108281A (en) | 2015-08-29 | 2015-08-29 | Welding process for oil pipe of main transformer of electric locomotive |
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| CN201510542245.1A Pending CN105108281A (en) | 2015-08-29 | 2015-08-29 | Welding process for oil pipe of main transformer of electric locomotive |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111185650A (en) * | 2020-01-21 | 2020-05-22 | 鞍钢股份有限公司 | Argon-electric combined welding process for carbon steel high-pressure oil pipe under condition of flowing oil |
| CN108031950B (en) * | 2017-11-02 | 2021-07-20 | 中国航发哈尔滨东安发动机有限公司 | Circumferential welding method for thin-wall pipeline parts |
| CN113458551A (en) * | 2021-06-01 | 2021-10-01 | 吕世雄 | Welding method and connecting pipe between double containers of narrow-gap double-container water heater |
| CN115451226A (en) * | 2022-07-19 | 2022-12-09 | 江苏长龄液压股份有限公司 | High-strength rotary joint and welding method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108031950B (en) * | 2017-11-02 | 2021-07-20 | 中国航发哈尔滨东安发动机有限公司 | Circumferential welding method for thin-wall pipeline parts |
| CN111185650A (en) * | 2020-01-21 | 2020-05-22 | 鞍钢股份有限公司 | Argon-electric combined welding process for carbon steel high-pressure oil pipe under condition of flowing oil |
| CN111185650B (en) * | 2020-01-21 | 2022-05-13 | 鞍钢股份有限公司 | A kind of argon electric welding process under the condition of flowing oil in carbon steel high pressure oil pipe |
| CN113458551A (en) * | 2021-06-01 | 2021-10-01 | 吕世雄 | Welding method and connecting pipe between double containers of narrow-gap double-container water heater |
| CN115451226A (en) * | 2022-07-19 | 2022-12-09 | 江苏长龄液压股份有限公司 | High-strength rotary joint and welding method thereof |
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Application publication date: 20151202 |
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