CN107414353A - A kind of demagnetization welding method for the pipeline that is magnetized - Google Patents
A kind of demagnetization welding method for the pipeline that is magnetized Download PDFInfo
- Publication number
- CN107414353A CN107414353A CN201710628146.4A CN201710628146A CN107414353A CN 107414353 A CN107414353 A CN 107414353A CN 201710628146 A CN201710628146 A CN 201710628146A CN 107414353 A CN107414353 A CN 107414353A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- demagnetization
- current
- magnetized
- carrying coil
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
Abstract
The invention discloses a kind of demagnetization welding method for the pipeline that is magnetized, comprise the following steps：Step 1: before the pipeline welding being magnetized, demagnetization processing is carried out using current-carrying coil demagnetization method first；It is specific as follows：Cover current-carrying coil respectively on the mouth of pipe both sides of pipeline, current-carrying coil connects resistance pressure regulator, and resistance pressure regulator is used for adjusting voltage, control electric current size, carries out anti-magnetic and handled to demagnetization, current-carrying coil is removed after the completion of processing；Step 2: fix the butting grooves relative position of pipeline, round steel is simmered into U-shaped and rolled up, across the both sides for being welded in groove, the both ends of round steel are apart from its respective nearest groove distance respectively less than 10mm, the both ends of round steel and pipeline full weld, along the groove circumference of pipeline, each 1 U-shaped of weldering is rolled up at 120 °, prescinds U-shaped volume after being soldered again, and the U-shaped volume after cutting, which is stayed in down on one of weld bond, to be used.The inventive method make to be magnetized erecting and welding quality of pipeline is guaranteed, easy to operate, expense is relatively low and workload is small.
Description
Technical field
The present invention relates to pipeline welding technical field, particularly a kind of demagnetization welding method for the pipeline that is magnetized.
Background technology
After steel pipe magnetizes, it will usually the normal weld of pipeline is influenceed, can not welding fabrication with the method for routine.In oil
In gas pipeline weld job, it sometimes appear that arc blow phenomenon, electric arc deviates pad.Arc blow has very to pipeline welding operation
Big harm.Pipeline remanent magnetism is a major reason for causing arc blow.It is because ferromagnetics is in externally-applied magnetic field that ferromagnetics, which is magnetized,
Or makes interior atoms more active because energy increases in the presence of other factors, so that magnetic domain arranges and right regularly
Outer display magnetic.Because the irreversibility of magnetic history is after the effect of externally-applied magnetic field or other factors stops, between each magnetic domain
Regular arrangement continues to retain to a certain extent, and shows as remanent magnetism.Remanent magnetism producing cause and welding quality influence building
If during with repairing gas piping progress weld job, it sometimes appear that arc blow influences the phenomenon of welding process.The shape of arc blow
Into being the result that remanent magnetism in pipe metal be present.Generally, remanent magnetism is divided into two kinds of induced magnetism and technique magnetic.Induced magnetism is often produced
Life is in the link of factory's tubulation, such as：Metal Melting, loaded and unloaded using electromagnetic lifter, steel pipe is parked in high-intensity magnetic field, uses
Magnetization method complete nondestructive inspection (NDI), steel pipe close to strength supply lines place etc..Technique magnetic, which often produces, is carrying out erection welding work
When industry and use magnetic clamper, fixture are with direct current welded pipe line, such as：The conductance being connected with dc source is contacted for a long time
Line, the short circuit of wire naked section or electrode holders and pipe etc..During welded bands magnetic steel pipe, the tired of arc ignition often can be appreciated that
Hardly possible, the destruction of arc burning stability, in magnetic field the deviation of electric arc, liquid metals and slag molten mass from splashing in welding pool
Go out.For stabilized welding process, improve quality of weld joint, the steel pipe being magnetized will carry out demagnetization before welding.
The external welding for example on the scene of traditional demagnetization method, connect in field.First steel pipe both ends are burn-on flange in factory, then transported
To joint connection in site, the influence of strong magnetic field circumstance when eliminating job site welding.Weak point is that pad adds one times, is come
Return and carry steel pipe, workload is big, long in time limit, expense increase.
The content of the invention
The technical problems to be solved by the invention are overcome the deficiencies in the prior art and provide a kind of disappearing for pipeline that is magnetized
Magnetic welding method, the inventive method make to be magnetized erecting and welding quality of pipeline are guaranteed, easy to operate, expense it is relatively low and
Workload is small.
The present invention uses following technical scheme to solve above-mentioned technical problem：
According to a kind of demagnetization welding method for the pipeline that is magnetized proposed by the present invention, comprise the following steps：
Step 1: before the pipeline welding being magnetized, demagnetization processing is carried out using current-carrying coil demagnetization method first；It is specific as follows：
Cover current-carrying coil respectively on the mouth of pipe both sides of pipeline, current-carrying coil connects resistance pressure regulator, and resistance pressure regulator is used for adjusting
Whole voltage, control electric current size, carry out anti-magnetic and handled to demagnetization, current-carrying coil is removed after the completion of processing；
Step 2: fixing the butting grooves relative position of pipeline, round steel is simmered into U shapes and rolled up, across the both sides for being welded in groove, circle
The both ends of steel are apart from its respective nearest groove distance respectively less than 10mm, both ends and the pipeline full weld of round steel, along the groove of pipeline
Circumference each 1 U shapes volume of weldering at 120 °, prescinds U shapes volume, the U shapes volume after cutting, which is stayed in down on one of weld bond, to be made again after being soldered
With.
As a kind of further prioritization scheme of demagnetization welding method of pipeline that is magnetized of the present invention, the step 1
One end of middle current-carrying coil is connected with one end of resistance pressure regulator, and the other end of resistance pressure regulator and one end of ammeter connect,
The other end of ammeter and one end of dc source connect, and the other end of dc source and one end of controlling switch connect, control
The other end of switch and the other end of current-carrying coil connect.
As a kind of further prioritization scheme of demagnetization welding method of pipeline that is magnetized of the present invention, current-carrying coil is
RVV.
As a kind of further prioritization scheme of demagnetization welding method of pipeline that is magnetized of the present invention, round steel specification is
17~22mm.
As a kind of further prioritization scheme of demagnetization welding method of pipeline that is magnetized of the present invention, U shapes roll up 2
Leg grows 140 mm.
The present invention compared with prior art, has following technique effect using above technical scheme：
（1）Welded for the Pipe installing being magnetized, it is necessary first to carry out demagnetization processing, then carry out welding, demagnetization welding again
Positive effect, improve efficiency of construction；
（2）The inventive method make to be magnetized erecting and welding quality of pipeline is guaranteed, easy to operate, expense is relatively low and works
Measure small.
Embodiment
Technical scheme is described in further detail below：
A kind of demagnetization welding method for the pipeline that is magnetized, comprises the following steps：
Step 1: before the pipeline welding being magnetized, demagnetization processing is carried out using current-carrying coil demagnetization method first；It is specific as follows：
Cover current-carrying coil respectively on the mouth of pipe both sides of pipeline, current-carrying coil connects resistance pressure regulator, and resistance pressure regulator is used for adjusting
Whole voltage, control electric current size, carry out anti-magnetic and handled to demagnetization, current-carrying coil is removed after the completion of processing；
Step 2: fixing the butting grooves relative position of pipeline, round steel is simmered into U shapes and rolled up, across the both sides for being welded in groove, circle
The both ends of steel are apart from its respective nearest groove distance respectively less than 10mm, both ends and the pipeline full weld of round steel, along the groove of pipeline
Circumference each 1 U shapes volume of weldering at 120 °, prescinds U shapes volume, the U shapes volume after cutting, which is stayed in down on one of weld bond, to be made again after being soldered
With.
One end of current-carrying coil is connected with one end of resistance pressure regulator in the step 1, the other end of resistance pressure regulator with
One end connection of ammeter, the other end of ammeter and one end of dc source are connected, and the other end and the control of dc source are opened
One end connection of pass, the other end of controlling switch and the other end of current-carrying coil connect.
Current-carrying coil is RVV.Round steel specification is 17~22mm.U shapes roll up 2 legs and grow 140 mm.
Welded for the Pipe installing being magnetized, it is necessary first to carry out demagnetization processing, then carry out welding, demagnetization welding again
Positive effect, improve efficiency of construction；The inventive method make to be magnetized erecting and welding quality of pipeline is guaranteed, easy to operate,
Expense is relatively low and workload is small.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deductions can also be made or substituted, should all be considered as belonging to the present invention's
Protection domain.
Claims (5)
1. a kind of demagnetization welding method for the pipeline that is magnetized, it is characterised in that comprise the following steps：
Step 1: before the pipeline welding being magnetized, demagnetization processing is carried out using current-carrying coil demagnetization method first；It is specific as follows：
Cover current-carrying coil respectively on the mouth of pipe both sides of pipeline, current-carrying coil connects resistance pressure regulator, and resistance pressure regulator is used for adjusting
Whole voltage, control electric current size, carry out anti-magnetic and handled to demagnetization, current-carrying coil is removed after the completion of processing；
Step 2: fixing the butting grooves relative position of pipeline, round steel is simmered into U shapes and rolled up, across the both sides for being welded in groove, circle
The both ends of steel are apart from its respective nearest groove distance respectively less than 10mm, both ends and the pipeline full weld of round steel, along the groove of pipeline
Circumference each 1 U shapes volume of weldering at 120 °, prescinds U shapes volume, the U shapes volume after cutting, which is stayed in down on one of weld bond, to be made again after being soldered
With.
2. the demagnetization welding method of a kind of pipeline that is magnetized according to claim 1, it is characterised in that in the step 1
One end of current-carrying coil is connected with one end of resistance pressure regulator, and the other end of resistance pressure regulator and one end of ammeter connect, electricity
The other end of flow table and one end of dc source are connected, and the other end of dc source and one end of controlling switch are connected, and control is opened
The other end of pass and the other end of current-carrying coil connect.
3. the demagnetization welding method of a kind of pipeline that is magnetized according to claim 1, it is characterised in that current-carrying coil is shield
Cover line.
4. the demagnetization welding method of a kind of pipeline that is magnetized according to claim 1, it is characterised in that round steel specification is 17
~22mm.
5. the demagnetization welding method of a kind of pipeline that is magnetized according to claim 1, it is characterised in that U shapes roll up 2 legs
Long 140 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710628146.4A CN107414353A (en) | 2017-07-28 | 2017-07-28 | A kind of demagnetization welding method for the pipeline that is magnetized |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710628146.4A CN107414353A (en) | 2017-07-28 | 2017-07-28 | A kind of demagnetization welding method for the pipeline that is magnetized |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107414353A true CN107414353A (en) | 2017-12-01 |
Family
ID=60431420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710628146.4A Pending CN107414353A (en) | 2017-07-28 | 2017-07-28 | A kind of demagnetization welding method for the pipeline that is magnetized |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621031A (en) * | 2020-12-07 | 2021-04-09 | 上海江南长兴造船有限责任公司 | Welding method of magnetized steel plate in ship building process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1271947A (en) * | 2000-06-15 | 2000-11-01 | 钢铁研究总院 | Demagnetizer for rotary magnetic field of ferromagnetic steel pipe |
| JP2004034254A (en) * | 2002-07-05 | 2004-02-05 | Akihisa Murata | Butt joint device for belt-like metal sheet |
| CN101017725A (en) * | 2006-12-11 | 2007-08-15 | 江苏通宇钢管集团有限公司 | Demagnetizing method and device of the spring welding pipe |
| CN102403084A (en) * | 2010-09-07 | 2012-04-04 | 中国石油天然气集团公司 | Hysteresis-damping demagnetizing method for pipeline port |
| CN103934548A (en) * | 2014-03-11 | 2014-07-23 | 中国化学工程第六建设有限公司 | Welding method of pure nickel pipelines |
-
2017
- 2017-07-28 CN CN201710628146.4A patent/CN107414353A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1271947A (en) * | 2000-06-15 | 2000-11-01 | 钢铁研究总院 | Demagnetizer for rotary magnetic field of ferromagnetic steel pipe |
| JP2004034254A (en) * | 2002-07-05 | 2004-02-05 | Akihisa Murata | Butt joint device for belt-like metal sheet |
| CN101017725A (en) * | 2006-12-11 | 2007-08-15 | 江苏通宇钢管集团有限公司 | Demagnetizing method and device of the spring welding pipe |
| CN102403084A (en) * | 2010-09-07 | 2012-04-04 | 中国石油天然气集团公司 | Hysteresis-damping demagnetizing method for pipeline port |
| CN103934548A (en) * | 2014-03-11 | 2014-07-23 | 中国化学工程第六建设有限公司 | Welding method of pure nickel pipelines |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621031A (en) * | 2020-12-07 | 2021-04-09 | 上海江南长兴造船有限责任公司 | Welding method of magnetized steel plate in ship building process |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171201 |