CN106514029B - The method of long tube end built-up welding - Google Patents
The method of long tube end built-up welding Download PDFInfo
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- CN106514029B CN106514029B CN201611187986.3A CN201611187986A CN106514029B CN 106514029 B CN106514029 B CN 106514029B CN 201611187986 A CN201611187986 A CN 201611187986A CN 106514029 B CN106514029 B CN 106514029B
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- welding
- long tube
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- tubulature
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
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- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of methods suitable for long tube end built-up welding, the following steps are included: waiting for that the end of built-up welding carries out retaining wall on slope to long tube, and make the backman's tubulature to match with long tube, backman's tubulature include tooling tube body and the setting of tooling tube body one end with the matched gasket ring of long tube；Complete long tube and backman's tubulature butt welding；Backman's tubulature is cut off, processes overlay cladding end face at the final groove of needs, to form the overlay cladding of long tube end.This method is by increasing backman's tubulature and gasket ring, the built-up welding of long end surfaces is set to be changed into the butt welding of long tube Yu backman's tubulature, welding position becomes downhand position from original horizontal position, keep welding operation more convenient, especially provide convenience condition for mechanised welding and automatic welding, it solves the problems, such as that long tube end built-up welding difficulty is big, at high cost, and is effectively guaranteed the quality of overlay cladding, greatly improve production efficiency.
Description
Technical field
The present invention relates to pipeline welding field, especially a kind of end built-up welding for boiler and chemical industry thin-wall tube
Method.
Background technique
Currently, in boiler and pressure vessels for the chemical industry product xenogenesis steel construction increase, be to solve dissimilar steel joint due to two
Side heat treatment of workpieces excessive temperature differentials is difficult to the problem of being heat-treated, and sensitization when prevention connector heat treatment to stainless steel work-piece,
It often requires that before dissimilar steel docking to wherein side workpiece end face built-up welding nickel-base material or stainless steel material.
In the prior art: as shown in Figure 1, thin-walled (pipe wall thickness≤15mm) short tube end groove face shorter for length
Built-up welding, major way is to place short tube (1) vertically at present, install additional on the inside of short tube (1) match with short tube (1) internal diameter it is interior
Side gasket ring (2) and outside install the outside gasket ring (3) to match with outer diameter additional and carry out built-up welding, are formed overlay cladding (11), built-up welding mode
Using manual welding, after the completion of welding, removal inside gasket ring (2) and outside gasket ring (3) are polished overlay cladding (11), after flaw detection is qualified
Reprocess groove.
But for thin-wall long pipe, since pipe is too long, if still if placing by the way of built-up welding vertically by place and
The influence of station is difficult to realize built-up welding, generally uses a kind of following two mode: mode at present are as follows: first by short tube (1) by existing
The built-up welding mode of technology carries out built-up welding, then again welds short tube (1) other end with long tube, this mode will increase docking
The quantity of weld bond, when especially producing in batches, weld bond quantity increases very much, and thus bring increased costs are very big, and some are produced
Product, which do not allow to dock overlay cladding inner wall, reinforcement, this will greatly increase the difficulty of docking overlay cladding；Another way are as follows: long tube water
Placing flat, the inside and outside wall of tube end install gasket ring additional and carry out built-up welding, and when built-up welding can only use horizontal position, and this mode not only be welded
It is difficult to connect, and surfacing layer quality is difficult to ensure.
Summary of the invention
The present invention provides a kind of method of long tube end built-up welding to solve above-mentioned technical problem.
The technical scheme adopted by the invention is that: the method for long tube end built-up welding, comprising the following steps: S1: to long tube
End to built-up welding carries out retaining wall on slope；S2: backman's tubulature that production matches with the long tube to built-up welding, and assemble backman
Tubulature and the elongate tubular to built-up welding are at docking groove type；S3: the welding of the butting grooves described in step S2 is completed, makes to be formed
Overlay cladding；S4: excision backman's tubulature；S5: to overlay cladding nondestructive inspection；S6: after flaw detection is qualified to the welding region of long tube into
Row heat treatment；S7: final retaining wall on slope is carried out to overlay cladding after heat treatment.This method is by increasing backman's tubulature and pad
Ring makes it be assembled into specific butting grooves form with to built-up welding long tube, and the built-up welding of long end surfaces is changed into long tube and auxiliary
The butt welding of tooling pipe makes welding position become downhand position from original horizontal position, keeps welding operation more convenient, especially
It is condition of providing convenience for mechanised welding and automatic welding.Gasket ring extend into certain distance in long tube and makes gasket ring when groove assembles
Outer surface can preferably guarantee the quality of overlay cladding Yu the basic overlay cladding of long end surfaces apart from inner wall of long pipe certain distance in this way；
It is vertical with long tube axis to cut off backman's tubulature post-processing overlay cladding end face, and processes overlay cladding inner wall and is flushed with inner wall of long pipe,
It can preferably guarantee detect a flaw accuracy and quality of detecting a flaw in this way.The width g of overlay cladding after final retaining wall on slope, according to subsequent right
Weldering mode is connect to determine, due to different welding methods welding heat affected zone it is of different size, and the thickness of overlay cladding is not less than
The heat affected area width of subsequent butt welding.
The bevel angle of backman's tubulature is 0 ° -50 °, in order to guarantee welding quality, needs out certain angle, but due to
Surfacing layer metal near backman's tubulature needs to remove when cutting off backman's tubulature, thus in order to reduce welding workload and
Machining allowance, avoids waste of time and material, and the bevel angle of backman's tubulature is further 0 ° -5 °.
In order to guarantee the root surfacing layer quality of long end surfaces, and dilution of the gasket ring to surfacing layer metal is prevented, gasket ring is deep
After entering into long tube, gasket ring outer surface is 1mm-5mm, the internal diameter of the overlay cladding (4) after welding in this way at a distance from inner wall of long pipe
The internal diameter of long tube will be less than, by the way that defect and dilution between gasket ring and overlay cladding will be eliminated after processing removal overlay cladding
Layer, is effectively guaranteed the root surfacing layer quality of long end surfaces.
For the root surfacing layer quality for guaranteeing long end surfaces, it is 1mm-10mm that gasket ring, which protrudes into the distance inside long tube, to protect
Root backing plate is demonstrate,proved not by burn-through, gasket ring is with a thickness of 2mm-8mm.
After long tube and auxiliary tube are assembled together, the root distance of long tube and backman's tubulature is 5mm-15mm, the width
It is in order to ensure width needed for being capable of processing out final overlay cladding on the overlay cladding welded.
After cutting off tooling pipe, the amount of axially reducing of processing overlay cladding (4) is 0mm-5mm, in order to avoid tooling pipe and built-up welding
Existing defects between layer add man-hour requirement the processing removal of tooling pipe is clean, while to reduce machining allowance, avoiding waste of time
And material, in the case where that can guarantee machining accuracy, the amount of axially reducing can be further designed to 0mm-2mm.
When to the final retaining wall on slope of heap overlay cladding, reduction amount of the overlay cladding of groove root along tube axis direction is
0mm-5mm avoids waste of time and material to reduce machining allowance, in the case where that can guarantee machining accuracy, the axial direction
Reduction amount can be further designed to 0mm-2mm.
After final retaining wall on slope, overlay cladding is 3-12mm along the minimum widith of pipe axial direction, and the width is according to subsequent
The method of butt welding determines that different welding method heat affected areas is different, and the width requirement of overlay cladding is greater than the heat of subsequent welding
The zone of influence, according to the welding method of current thin-wall tube, such overlay cladding mainly uses tungsten argon arc, heat in subsequent butt welding
It influences sector width and is generally 3mm-6mm, therefore overlay cladding can be further designed to 5mm-9mm along the minimum widith of pipe axial direction.
The beneficial effects of the present invention are: making the built-up welding of long end surfaces be changed into length by increasing backman's tubulature and gasket ring
The butt welding of pipe and backman's tubulature, welding position become downhand position from original horizontal position, make welding operation more just
Victory is especially provided convenience condition for mechanised welding and automatic welding, solves that long tube end built-up welding difficulty is big, at high cost asks
Topic, and it is effectively guaranteed the quality of overlay cladding, greatly improve production efficiency.
Detailed description of the invention
Fig. 1 is prior art short tube end built-up welding schematic diagram.
Fig. 2 is the long tube end built-up welding schematic diagram of the present invention.
Fig. 3 is excision backman's tubulature schematic diagram.
Fig. 4 is polishing overlay cladding schematic diagram.
Fig. 5 is dissimilar steel overlay cladding docking schematic diagram of the present invention.
In the figure, it is marked as 1, short tube；2, inside gasket ring；3, outside gasket ring；4, overlay cladding；5, long tube；6, backman's tubulature；
7, tooling tube body；8, gasket ring；10, SA-213T22 is managed；11, overlay cladding；A, gasket ring outer surface is at a distance from inner wall of long pipe；b,
Gasket ring protrudes into the distance inside long tube；C, gasket ring thickness；D, long tube and auxiliary mould pipe bevel root distance；E, machine adds overlay cladding
The amount of axially reducing；F, reduction amount of the overlay cladding in long tube axial direction；G, minimum widith of the overlay cladding in long tube axial direction；α, groove angle
Degree.
Specific embodiment
The following further describes the present invention with reference to the drawings.
The present embodiment is illustrated, dissimilar steel joint two sides by taking the different steel weld of certain company's steam superheater pipe as an example
Pipe be respectively SA-213T22 (hereinafter referred to as T22) and SA-213T91 (hereinafter referred to as T91), pipe specification are as follows: φ 38 ×
5, T91 tube lengths are 6m-7m, and T91 pipe is the long tube 5 for being processed groove.
As shown in Figure 2, Figure 3 and Figure 4, the present invention is the method for long tube end built-up welding: first to long tube 5 by the end of built-up welding
First time retaining wall on slope makes backman's tubulature 6, and backman's tubulature 6 includes gasket ring 8 and tooling tube body 7, to backman's tubulature
6 carry out retaining wall on slope, and backman's tubulature 6 uses specification for the pipe of φ 38 × 11, and processing gasket ring 8 and tooling tube body 7 are one
Whole, 8 length of gasket ring is 15mm, and 6 bevel angle of backman's tubulature is 5 °；Process 5 end face groove of long tube；In mechanised welding before welding
Root distance between two pipes of upper adjustment is 10mm, is clamped two pipes using the two sides fixture of mechanised welding after adjusting spacing
Securely, the form of groove Fig. 2 is formed；Welding method is motor-driven TIG weldering, and welding wire uses ERNiCrMo-3；It will be grown in downhand position
Pipe 5 welds together with backman's tubulature 6, forms overlay cladding 4, and overlay cladding 4 is nickel-base material；Along overlay cladding 4 and auxiliary mould
6 contact surface of pipe cuts off backman's tubulature 6；Machine adds overlay cladding end face extremely vertical with 5 axis of long tube, and machine adds removal overlay cladding end face
0-2mm is to guarantee overlay cladding end face zero defect；5 inner wall overlaying layer reinforcement of long tube is processed in interior boring, is made in overlay cladding inner wall and long tube 5
Wall flushes, and processing 5 outer wall of long tube makes to flush on the outside of overlay cladding with tube outer wall；100%RT+100%PT spy is carried out to overlay cladding 4
Wound；After flaw detection is qualified, the long tube 5 with overlay cladding is heat-treated, specification of heat treatment is 760 DEG C/1.5h；It is right after heat treatment
4 finished edge of overlay cladding；Long tube 5 and T22 pipe is mutually welded.
Claims (9)
1. the method for long tube end built-up welding, it is characterised in that: the following steps are included:
S1: retaining wall on slope is carried out to the end to built-up welding of long tube (5)；
S2: backman's tubulature (6) that production matches with the long tube (5) to built-up welding, backman's tubulature (6) includes tooling tube body
(7) and tooling tube body one end setting with long tube (5) matched gasket ring (8), long tube (5) is protruded into heap in the end face of gasket ring (8)
In the end of weldering, assembling backman's tubulature (6) forms butting grooves form with the long tube (5) to built-up welding, and the gasket ring (8) is protruded into
After in long tube (5), the outer surface of gasket ring (8) (a) at a distance from long tube (5) inner wall is 1mm-5mm；
S3: the welding of the butting grooves described in step S2 is completed, makes to form overlay cladding (4)；
S4: excision backman's tubulature (6)；
S5: to overlay cladding (4) nondestructive inspection；
S6: the welding region of long tube (5) is heat-treated after flaw detection is qualified；
S7: final retaining wall on slope is carried out to overlay cladding (4) after heat treatment.
2. the method for long tube end built-up welding according to claim 1, it is characterised in that: backman's tubulature described in step S2
(6) bevel angle is 0 ° -50 ° of (α).
3. the method for long tube end built-up welding as described in claim 1, it is characterised in that: gasket ring described in step S2 (8) and tooling pipe
Ontology (7) is integrally formed.
4. the method for long tube end built-up welding as described in claim 1, it is characterised in that: gasket ring described in step S2 (8) and tooling pipe
Ontology (7) is to weld together again after individually processing.
5. the method for long tube end built-up welding as described in claim 1, it is characterised in that: gasket ring described in step S2 (8) protrudes into long tube
(5) internal distance (b) is 1mm-100mm, and the thickness (c) of gasket ring (8) is 2mm-8mm.
6. the method for long tube end built-up welding as described in claim 1, it is characterised in that: long tube described in step S2 (5) and backman
Tubulature (6) assembly is after butting grooves form, groove root distance (d) is 5mm-15mm.
7. the method for long tube end built-up welding as described in claim 1, it is characterised in that: in the step S4, cut off auxiliary mould
Pipe (6) post-processing overlay cladding (4) section is smooth, and the root amount of axially reducing (e) after overlay cladding (4) processing is 0mm-5mm.
8. the method for long tube end built-up welding as described in claim 1, it is characterised in that: in step S7, to overlay cladding (4) final slope
After mouth processing, the overlay cladding (4) of groove root is 0mm-5mm along the reduction amount (f) of long tube (5) axis direction.
9. the method for long tube end built-up welding as described in claim 1, it is characterised in that: in step S7, to overlay cladding (4) final slope
After mouth processing, overlay cladding (4) is 3-12mm along the minimum widith (g) of long tube (5) axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611187986.3A CN106514029B (en) | 2016-12-20 | 2016-12-20 | The method of long tube end built-up welding |
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|---|---|---|---|
| CN201611187986.3A CN106514029B (en) | 2016-12-20 | 2016-12-20 | The method of long tube end built-up welding |
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| CN106514029A CN106514029A (en) | 2017-03-22 |
| CN106514029B true CN106514029B (en) | 2019-05-14 |
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| CN109128436A (en) * | 2018-10-15 | 2019-01-04 | 武汉船用机械有限责任公司 | A kind of process of the built-up welding aluminium bronze on steel |
| CN109773308B (en) * | 2019-01-31 | 2022-04-29 | 武汉船用机械有限责任公司 | End surface overlaying method of copper alloy guide rail |
| CN112756835B (en) * | 2021-01-29 | 2022-10-28 | 东方电气集团东方锅炉股份有限公司 | Method for processing surfacing layer of butt weld of tube plate |
| CN113770492A (en) * | 2021-09-16 | 2021-12-10 | 山东核电设备制造有限公司 | Surfacing welding method for transition layer at end part of tubular structure |
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| JP4766587B2 (en) * | 2004-02-02 | 2011-09-07 | 第一高周波工業株式会社 | Clad pipe |
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|---|---|---|---|---|
| JPS631886A (en) * | 1987-03-03 | 1988-01-06 | 川崎重工業株式会社 | End-section pretreatment welding unit double-pipe structure |
| JP2003225763A (en) * | 2002-02-04 | 2003-08-12 | Babcock Hitachi Kk | Tip end shape of nozzle for pressure vessel and method for build-up welding to tip end part |
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