CN107009003A - The Rework Technics of Condenser Titanium Tube - Google Patents
The Rework Technics of Condenser Titanium Tube Download PDFInfo
- Publication number
- CN107009003A CN107009003A CN201710339790.XA CN201710339790A CN107009003A CN 107009003 A CN107009003 A CN 107009003A CN 201710339790 A CN201710339790 A CN 201710339790A CN 107009003 A CN107009003 A CN 107009003A
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- welding
- crackle
- titanium tube
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Classifications
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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
- 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
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The Rework Technics of Condenser Titanium Tube of the present invention, belong to welding field, it is therefore an objective to which raising disposably reprocesses qualification rate.Comprise the following steps：1), removal of defects；2), with the manual welder for having current attenuation and delay protection, the manual repair welding of progress is symmetrically welded using subregion；Welding current is 70-90A, and argon gas pre-set time is 3 5s, and argon flow amount is 6 8L/min, and interlayer temperature is less than or equal to 200 DEG C, and speed of welding is 7.5 10cm/min；3), postwelding inspection.The invention, it is that 3 5s and argon flow amount are 6 8L/min to ensureing that welding region molten bath and high-temperature heat-affected zone form protecting effect to use argon gas pre-set time, it is to avoid the pollution of oxygen, nitrogen, hydrogen etc. in air and cause the decline of titanium plasticity and toughness.Defective titanium surface is avoided to form harmful ferrotianium compound and carbide by removing；70-90A low current technological parameter is used in welding, welding point coarse grains are prevented.Repair welding quality finally is ensure that, weld defect is eliminated, makes the disposable qualification rate of repair welding up to more than 99.99%.
Description
Technical field
The invention belongs to the Rework Technics of welding field, particularly Condenser Titanium Tube.
Background technology
Condenser is that, for cooling down turbine low pressure cylinder steam drain, the temperature and pressure of reduction steam drain improves steam turbine
Rotating speed, to reach the generated output of needs.Titanium tube plate is then the core of condenser, and coastal engineering is all to use seawater conduct
Cooling agent is cooled down, and seawater flows through the low pressure (LP) cylinder steam drain around cooling tube out of titanium tube, it is necessary to assure seawater is curved with steam discharge
Song is separated, so titanium tube can not be leaked, otherwise will influence the water quality of condensate, therefore the quality of titanium tube plate construction directly influences vapour
The operation conditions of turbine and the generated output of generator.And titanium tube plate construction in most it is rambunctious and be easiest to problem appear to is that
In welding, and Rework Technics therein are just particularly important.At present, the welding procedure one in the welding and making in reprocessing
Sample, therefore, the Welding Problems occurred in making are retained in repair welding, cause number of rewelding to increase, and disposable percent of pass is low.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of Rework Technics of Condenser Titanium Tube, are disposably returned with improving
Repair qualification rate.
The technical solution adopted by the present invention is：The Rework Technics of Condenser Titanium Tube, comprise the following steps：
1), removal of defects：Including the impurity in back chipping crackle, cleaning titanium plate and titanium tube and removing overlap；
2), there is the manual welder of current attenuation and delay protection, the manual repair welding of progress is symmetrically welded using subregion；Welding electricity
Flow for 70-90A, argon gas pre-set time is 3-5s, and argon flow amount is 6-8L/min, and interlayer temperature is less than or equal to during welding
200 DEG C, speed of welding is 7.5-10cm/min；
3), postwelding inspection, if defect is present, repeats the above steps.
Before further, it is preferred that step 2), manual welding parameter is first determined, its concrete operations is first to weld by hand
With the mode of reduction hydrogen shield one group of crackle is manufactured that on exercise pipe；Then, crack defect is removed with sanding machine, and will
Cracked zone is cleaned up；Then one group of crackle is entered under one group of different welding parameter using high-frequency impulse GTAW
Row repair welding one by one, this group different welding parameters are in step 1) in welding parameter in the range of；Finally, using penetrant inspection
Mode to after repairing crackle carry out nondestructive inspection, select quality meet require repairing after crackle, the crackle after the repairing
Corresponding welding parameter is repair welding parameter.
Further, step 1) in, it is the step of back chipping crackle：First, it is using sanding machine that crackle is fully erased；So
Afterwards, the slit region cleaned with acetone after back chipping；Remove overlap the step of be：First, overlap is ground with carbide rotary tool
Fall, then using tube expander again tube expansion, the overlap region finally cleaned with acetone after rasion.
Further, step 2) in, during stomata repair welding, tungsten electrode point is directly directed at the hole area starting the arc, after after stomata fusing
Stop arc immediately, stop removing argon arc after carrying out cooling 3-6s to repair welding point with argon gas after arc.
Further, step 3) concrete operations be, after weld bond cooling after, checked first；Carried out again after 24 hours
It is secondary to check.
Further, the purity of the argon gas used is more than or equal to 99%.
The beneficial effects of the invention are as follows：The invention, uses that argon gas pre-set time is 3-5s and argon flow amount is 6-8L/min
To ensureing that welding region molten bath and high-temperature heat-affected zone form protecting effect, it is to avoid the pollution of oxygen, nitrogen, hydrogen etc. in air and cause
The decline of titanium plasticity and toughness.Defective titanium surface is avoided to form harmful ferrotianium compound and carbonization by removing
Thing；70-90A low current technological parameter is used in welding, welding point coarse grains are prevented.Repair welding quality finally is ensure that,
Weld defect is eliminated, makes the disposable qualification rate of repair welding up to more than 99.99%.
Embodiment
The Rework Technics of Condenser Titanium Tube, comprise the following steps：
1), removal of defects：Including the impurity in back chipping crackle, cleaning titanium plate and titanium tube and removing overlap；
2), there is the manual welder of current attenuation and delay protection, the manual repair welding of progress is symmetrically welded using subregion；Welding electricity
Flow for 70-90A, argon gas pre-set time is 3-5s, and argon flow amount is 6-8L/min, and interlayer temperature is less than or equal to during welding
200 DEG C, speed of welding is 7.5-10cm/min；
3), postwelding inspection, if defect is present, repeats the above steps.
The invention, uses that argon gas pre-set time is 6-8L/min for 3-5s, argon flow amount and interlayer temperature is less than or waited
In 200 DEG C to ensureing that welding region molten bath and high-temperature heat-affected zone form protecting effect, it is to avoid the dirt of oxygen, nitrogen, hydrogen etc. in air
Contaminate and cause the decline of titanium plasticity and toughness；Speed of welding is that 7.5-10cm/min is easy to welding slag to have enough time effusion,
Avoid the occurrence of the defects such as stomata, slag inclusion and crackle；Titanium surface is avoided to form harmful ferrotianium compound by the way that removing is defective
And carbide；70-90A low current technological parameter is used in welding, welding point coarse grains are prevented；Finally it ensure that benefit
Quality is welded, weld defect is eliminated, makes the disposable qualification rate of repair welding up to more than 99.99%.
It is preferred that, step 2) before, manual welding parameter is first determined, its concrete operations is first to weld and reduce by hand hydrogen
The mode of gas shielded is manufactured that one group of crackle on exercise pipe；Then, crack defect is removed with sanding machine, and cracked zone is clear
Wash clean；Then one group of crackle is mended one by one under one group of different welding parameter using high-frequency impulse GTAW
Weldering, this group different welding parameters are in step 1) in welding parameter in the range of；Finally, by the way of penetrant inspection pair
Crackle carries out nondestructive inspection after repairing, selects quality and meets the crackle after desired repairing, the corresponding weldering of crackle after the repairing
Connect parameter i.e. repair welding parameter.
Welding parameter is determined by testing, the influence of individual difference is eliminated, it is ensured that manual welding quality.
It is preferred that, step 1) in, it is the step of back chipping crackle：First, it is using sanding machine that crackle is fully erased；Then,
The slit region cleaned with acetone after back chipping；Remove overlap the step of be：First, overlap is ground off with carbide rotary tool,
Then using tube expander again tube expansion, the overlap region finally cleaned with acetone after rasion.
It was found that using sanding machine that crackle is fully erased after crackle, otherwise the crackle of depths may be by several after repair welding
Surface is slowly extended to after individual hour, new crackle is caused.Slit region after digging is checked, is confirmed after thoroughly removing
Repair welding can be just carried out,
Overlap producing cause is mainly tube expansion, and tight or automatic welder axiality is not inadequate, and welding gun deviates titanium tube center line and caused
's.Overlap is general relatively deep with incomplete fusion defective locations, and some overlaps are in the place from the mouth of pipe farther out, and repair welding position is more difficult, and
Because titanium tube is relatively thin, during repair welding easily by titanium tube scaling loss, position more inward, the more difficult result of repair welding.Overlap lacks with incomplete fusion
Fall into before repair welding, first should be ground off overlap with carbide rotary tool, then using tube expander again tube expansion, then after being cleaned with acetone
Carry out repair welding.
Titanium is that the reaction speed under a kind of active metal, high temperature with oxygen, nitrogen, hydrogen is very fast, the quick suction hydrogen more than 300 DEG C,
The quick oxygen uptake more than 600 DEG C, more than 700 DEG C are quickly inhaled nitrogen, and titanium is also easy to oxidation in atmosphere.With gas such as oxygen, nitrogen, hydrogen
Increase of the body content in titanium, the plasticity and toughness of titanium will decline to a great extent, molten bath and the weld seam gold just solidified in welding
Category and high-temperature heat-affected zone, can not be such as effectively protected, then easily be polluted by impurity such as air seawaters, it is also possible to
Cause the embrittlement of metal, be at this moment easy for cracking defect in the presence of welding stress.It is for welding pool and just solidifying
Solid weld metal and high-order heat affected area form good protection, it is preferred that step 2) in, during stomata repair welding, tungsten electrode point is straight
The alignment hole area starting the arc is connect, after stopping arc immediately after stomata fusing, stops carrying out repair welding point with argon gas general after cooling 3-6s after arc
Argon arc is removed.On the premise of other conditions all same, stop moving argon arc after carrying out cooling 3-6s to repair welding point with argon gas after arc
The likelihood ratio for outputing existing crackle stops after arc directly to remove argon gas and reduces one times.
In order to ensure without delayed crack, step 3) concrete operations be：After after weld bond cooling, checked first；24 is small
When after checked again for, further repaired if it there is crackle.
In order to which the weld metal for further ensuring that to molten bath and just solidifying and high-order heat affected area form good protection,
Avoid shielding failure, produce hydrogen induced cracking, the defect such as oxidation, preferably, the purity of the argon gas used is more than or equal to
99%.Welded in the purity of argon gas more than or equal to 99% time, the probability of shielding failure is zero.
Claims (6)
1. the Rework Technics of Condenser Titanium Tube, it is characterised in that：Comprise the following steps：
1), removal of defects：Including the impurity in back chipping crackle, cleaning titanium plate and titanium tube and removing overlap；
2), there is the manual welder of current attenuation and delay protection, the manual repair welding of progress is symmetrically welded using subregion；Welding current is
70-90A, argon gas pre-set time is 3-5s, and argon flow amount is 6-8L/min, and interlayer temperature is less than or equal to 200 during welding
DEG C, speed of welding is 7.5-10cm/min；
3), postwelding inspection, if defect is present, repeats the above steps.
2. the Rework Technics of Condenser Titanium Tube as claimed in claim 1, it is characterised in that：It is preferred that, step 2) before, first really
Determine manual welding parameter, its concrete operations is that the mode for first welding and reducing by hand hydrogen shield is manufactured that on exercise pipe
One group of crackle；Then, crack defect is removed with sanding machine, and cracked zone is cleaned up；Then using the manual tungsten of high-frequency impulse
Electrode argon arc welding carries out repair welding one by one under one group of different welding parameter to one group of crackle, and this group different welding parameters are in step
It is rapid 1) in welding parameter in the range of；Finally, crackle carries out nondestructive inspection after by the way of the penetrant inspection to repairing, selects matter
Amount meets the crackle after desired repairing, and the corresponding welding parameter of crackle after the repairing is repair welding parameter.
3. the Rework Technics of Condenser Titanium Tube as claimed in claim 1, it is characterised in that：Step 1) in, the step of back chipping crackle
Suddenly it is：First, it is using sanding machine that crackle is fully erased；Then, the slit region cleaned with acetone after back chipping；Remove overlap
Step is：First, overlap is ground off with carbide rotary tool, then using tube expander again tube expansion, finally cleaned with acetone
Overlap region after rasion.
4. the Rework Technics of the Condenser Titanium Tube as described in claim 1-3 any one claims, it is characterised in that：Step
2) in, during stomata repair welding, tungsten electrode point is directly directed at the hole area starting the arc, after stopping arc immediately after stomata fusing, stops using argon gas after arc
Argon arc is removed after carrying out cooling 3-6s to repair welding point.
5. the Rework Technics of Condenser Titanium Tube as claimed in claim 4, it is characterised in that：Step 3) concrete operations be to treat
After weld bond cooling, checked first；Checked again for after 24 hours.
6. the Rework Technics of Condenser Titanium Tube as claimed in claim 4, it is characterised in that：The purity of the argon gas used is more than
Or equal to 99%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339790.XA CN107009003A (en) | 2017-05-15 | 2017-05-15 | The Rework Technics of Condenser Titanium Tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339790.XA CN107009003A (en) | 2017-05-15 | 2017-05-15 | The Rework Technics of Condenser Titanium Tube |
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| CN107009003A true CN107009003A (en) | 2017-08-04 |
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| CN201710339790.XA Pending CN107009003A (en) | 2017-05-15 | 2017-05-15 | The Rework Technics of Condenser Titanium Tube |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108098180A (en) * | 2017-12-30 | 2018-06-01 | 山东豪迈机械制造有限公司 | Assessment method is reprocessed in a kind of welding |
| CN108340054A (en) * | 2018-03-13 | 2018-07-31 | 今创集团股份有限公司 | Confined space blocks the process of weldering |
| CN108971710A (en) * | 2018-07-24 | 2018-12-11 | 东方电气(广州)重型机器有限公司 | A kind of connection processing technology of tube-tube plate |
| CN109434253A (en) * | 2018-07-29 | 2019-03-08 | 合肥市智信汽车科技有限公司 | A kind of method for welding exhaust tubes of railway transport vehicles |
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| JP2016068593A (en) * | 2014-09-26 | 2016-05-09 | 新日鐵住金株式会社 | Truck frame for railway vehicle and method of manufacturing the same |
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2017
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| CN103962791A (en) * | 2013-02-01 | 2014-08-06 | 哈尔滨建成集团有限公司 | Welding repair method for large-sized heat-resistant steel castings |
| CN104128696A (en) * | 2014-06-30 | 2014-11-05 | 中国化学工程第十四建设有限公司 | Titanium pipeline argon arc welding process method |
| JP2016068593A (en) * | 2014-09-26 | 2016-05-09 | 新日鐵住金株式会社 | Truck frame for railway vehicle and method of manufacturing the same |
| CN105312743A (en) * | 2015-10-30 | 2016-02-10 | 长治清华机械厂 | On-site repair welding method for 5A06 aluminum barrel finished product welding joint stress corrosion crack |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108098180A (en) * | 2017-12-30 | 2018-06-01 | 山东豪迈机械制造有限公司 | Assessment method is reprocessed in a kind of welding |
| CN108340054A (en) * | 2018-03-13 | 2018-07-31 | 今创集团股份有限公司 | Confined space blocks the process of weldering |
| CN108971710A (en) * | 2018-07-24 | 2018-12-11 | 东方电气(广州)重型机器有限公司 | A kind of connection processing technology of tube-tube plate |
| CN109434253A (en) * | 2018-07-29 | 2019-03-08 | 合肥市智信汽车科技有限公司 | A kind of method for welding exhaust tubes of railway transport vehicles |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 250014 Building No. 5, district three, Han Yu financial business center, Ji'nan, Shandong Applicant after: China Electric Construction Group Shandong Electric Power Construction Co., Ltd. Address before: 250000, No. ten, No. 10567, Ji'nan, Shandong Applicant before: Shandong Electric Power Construction Corporation |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170804 |
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| RJ01 | Rejection of invention patent application after publication |