CN109396610A - A kind of welding procedure of bellows - Google Patents

A kind of welding procedure of bellows Download PDF

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Publication number
CN109396610A
CN109396610A CN201811264469.0A CN201811264469A CN109396610A CN 109396610 A CN109396610 A CN 109396610A CN 201811264469 A CN201811264469 A CN 201811264469A CN 109396610 A CN109396610 A CN 109396610A
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CN
China
Prior art keywords
welding
bellows
procedure
welding procedure
arc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811264469.0A
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Chinese (zh)
Inventor
吉远宏
刘明安
张丽
吉远东
杨磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGSU FENGHE MACHINERY MANUFACTURING Co Ltd
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JIANGSU FENGHE MACHINERY MANUFACTURING Co Ltd
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Publication date
Application filed by JIANGSU FENGHE MACHINERY MANUFACTURING Co Ltd filed Critical JIANGSU FENGHE MACHINERY MANUFACTURING Co Ltd
Priority to CN201811264469.0A priority Critical patent/CN109396610A/en
Publication of CN109396610A publication Critical patent/CN109396610A/en
Pending legal-status Critical Current

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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
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3033—Ni as the principal constituent
    • 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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
    • B23K9/18—Submerged-arc welding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)

Abstract

A kind of welding procedure of bellows, which comprises the following steps: step 1: welding characteristic research；Step 2: welding material and welding procedure are formulated；Step 3: welding；Step 4: quality control, the quality control includes technical work, technology controlling and process and quality inspection and acceptance.

Description

A kind of welding procedure of bellows
Technical field
The present invention relates to welding technology fields, and in particular to a kind of welding procedure of bellows.
Background technique
Telescopic joint cost accounts for that total investment of engineering is few, but the reliability of its quality and safety are directly related to the peace of power generation Row for the national games, manufacturing quality will more attract great attention.Compound telescopic joint product structure is complicated, this body weight weight, bore is big, and three The displacement of a direction is bigger than normal in same type project compensation amount, so it has to be ensured that the properties of product and index it is safe and reliable, Certain safety coefficient must be taken into consideration in design, manufacturing process, and to consider the accurate size of the various components of on-site assembly Property, it is also contemplated that used technique and welding method when site welding, are tested with guaranteeing to examine after being completed with water pressure once Fold lattice.
It, can be effective in the welding material welding process for the feature that Ni-based fire check sensibility is strong, liquid fluidity is poor Incomplete fusion phenomenon is avoided, weld porosity rate is low, and room temperature satisfactory mechanical property.But found in application, ERNiCr-3 is as nickel The welding material of base still has deficiency, and outstanding behaviours is that weld seam mechanical behavior under high temperature is undesirable.This defect makes product exist There are hidden danger for stability and safety under high temperature application environment, to limit what product was required in certain pairs of mechanical properties Application under hot environment.
In view of performance especially mechanical behavior under high temperature is researched and developed more preferably in hot environment in many places to bellows in practical applications Mating welding material just seem particularly necessary.
Summary of the invention
The application overcomes the deficiencies in the prior art, provides, and solves the problems, such as.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of welding procedure of bellows, comprising the following steps:
Step 1: welding characteristic research；
Step 2: welding material and welding procedure are formulated；
Step 3: welding；
Step 4: quality control, the quality control includes technical work, technology controlling and process and quality inspection and acceptance.
Further, the welding characteristic research is ground to the chemical component and its mechanical performance of 07MnMoVR high-strength steel Study carefully.
Further, the 07MnMoVR high-strength steel Mn content is 1.2%~1.6%, tensile strength reaches 630~ 730MPa。
Further, the welding procedure is welding electrode arc welding and/or argon tungsten-arc welding and/or submerged-arc welding.
Further, the longitudinal joint groove of the welding procedure is the 1/3 asymmetric X-shaped without root face, and bevel angle is 60 °, It is processed using 12 edge planers, circumferential weld groove is the symmetrical X-shaped of 2mm root face, and bevel angle is also 60 °, using semi auto cutting machine Processing.
Further, the welding procedure should all set run-on tab in addition to girth joint.
Further, the run-on tab includes lead-in plate and end tab.
A kind of welding material, the welding material by mass percentage, are made of following chemical component: C≤0.5%, Cr 16.0~18.0%, Fe 6.0~10.0%, Mn≤1.0%, Nb 1.5~3.0%, Si 0.6~1.0%, S≤ 0.015%, P≤0.015%, Ni >=70.0%, k≤0.015%.
Further, the welding material by mass percentage, is made of following chemical component: C 0.3%, Cr 16.8%, Fe 7.2%, Mn 0.4%, Nb 2.45%, Si 0.85%, S0.002%, P 0.002%, k 0.002%.Ni Surplus.
Further, the welding procedure used when being welded using welding material is selected from gas metal-arc welding, non-melt Pole gas shielded arc welding or automatic welding, it is preferred to use non-consumable gas shielded arc welding technique.
The utility model has the advantages that not only there is the weld seam that the application is obtained by the welding material good surface topography (to be not in The defects of crackle, stomata, undercut) and corrosion resistance, and there is excellent room temperature and mechanical behavior under high temperature, it can be greatly Promote the quality and service life of product.
Known welding material in compared with the existing technology, the present invention by adjusting ingredient each in welding material type and ratio Example, so that more superior synergistic function can be played between each component.The weld seam of welding material welding is not in split The defects of line, stomata, undercut, and there is excellent corrosion resistance, room temperature and mechanical behavior under high temperature, in mechanical behavior under high temperature side Face shows clear superiority.
Detailed description of the invention
Fig. 1 is the application weld groove figure；
Fig. 2 is the application field joint symmetrical welding precedence diagram；
Fig. 3 is the application bellows-welding schematic diagram；
Fig. 4 is the application stiffening ring and the design drawing for reinforcing support.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not For limiting the present invention.
Embodiment 1:
A kind of welding procedure of bellows, comprising the following steps:
Step 1: welding characteristic research；
Step 2: welding material and welding procedure are formulated；
Step 3: welding；
Step 4: quality control, the quality control includes technical work, technology controlling and process and quality inspection and acceptance.
Further, the welding characteristic research is ground to the chemical component and its mechanical performance of 07MnMoVR high-strength steel Study carefully.
Further, the 07MnMoVR high-strength steel Mn content is 1.2%~1.6%, tensile strength reaches 630~ 730MPa。
Further, the welding procedure is welding electrode arc welding and/or argon tungsten-arc welding and/or submerged-arc welding.
Further, the longitudinal joint groove of the welding procedure is the 1/3 asymmetric X-shaped without root face, and bevel angle is 60 °, It is processed using 12 edge planers, circumferential weld groove is the symmetrical X-shaped of 2mm root face, and bevel angle is also 60 °, using semi auto cutting machine Processing.
Further, the welding procedure should all set run-on tab in addition to girth joint.
Further, the run-on tab includes lead-in plate and end tab.
Embodiment 2:
For Product jointing characteristic research, divide according to 07MnMoVR high-strength steel chemical component table and its mechanical performance table Analysis:
The high-strength steel chemical composition of 07MnMoVR and its mechanical performance table
07MnMoVR high-strength steel Mn content is higher, and about 1.2%~1.6%, containing the very low pressure vessel of C, S amount with quenched High-strength plate, tensile strength reach 630~730Mpa.Reduce the weldability that C content improves 07MnMoVR high-strength steel.
Therefore 07MnMoVR high-strength steel weldability generally occurs within the problem of two aspects:
(1) various welding defects caused by welding, mainly all kinds of crack problems.What 07MnMoVR was generally generated when welding Crackle is usually HOT CRACK FOR WELDING P and welding retardance crackle.
(2) variation of material property when welding: mainly heat affected area and seam organization change.
Welding material selects table
(3) 07MnMoVR high-strength steel selects welding material and welding procedure:
07MnMoVR steel manual electric arc welding longitudinal joint welds welding condition table
As shown in Figure 1, penstock longitudinal joint groove is the 1/3 asymmetric X-shaped without root face, bevel angle is 60 °, using 12 Edge planer processing, circumferential weld groove are the symmetrical X-shaped of 2mm root face, and bevel angle is also 60 °, is machined using semi-automatic cutting.
For welding points for attention:
A. in addition to girth joint, submerged-arc welding and manual welding should all be set run-on tab (lead-in plate and end tab), cannot be when welding Striking on base material, should striking in groove or on run-on tab.
B. the removal of work card tool is forbidden to hammer, and cuts off using carbon arc air gouging or gas cutting from tube wall 3mm or more, forbids to damage Base material, it is then smooth with grinder buffing.When stopping weldering due to cause specific midway, hot heat preservation should be carried out immediately, answered when welding again It can be welded by former level weld seam requirement after all being preheated.
C. using asymmetric X-shaped (1/3 groove), when welding, guarantees multilayer multiple tracks and is symmetrically welded, and now welds 2/3 side slope mouth Weld seam stays capping layer, after seam of turning round carries out gouge back chipping and qualification of polishing, then is welded.
D. field joint is girth joint, should weld one by one, be unable to skip welding, be all made of manual welding, is fallen back and is applied using segmentation The mode of weldering is welded, and to demarcate in pipe or so, manages interior first vertical position welding, overhead welding weld seam.Outer downhand welding, vertical position welding dorsal suture are managed, such as Fig. 2 institute Show,
On Fabrication quality control, including quality assurance measure, quality inspection and acceptance.
In quality assurance measure, technical work emphasis:
(1) engineers and technicians must conscientiously be familiar with and read drawing, understand design idea.Maximum possible Optimizing construction side Case plays the role of Instructing manufacture conscientiously.
(2) it conscientiously carries out and confides a technological secret, tasks clear and content, technical requirements, key problem in technology, technical difficulty, quality wants It asks.Construction personnel must receive work of confiding a technological secret, and strictly by the construction of the technological documents such as drawing, technique.
(3) in construction, severe quality management and construction note is improved, completion information is provided to management at any time, with for future reference It reads.Reliable inspection and experimental arrangement are established, and its activity is formed into file and/or is retained in the form of quality record, To from the overall process strict control into cash and delivery, comprising: receiving inspection, procedure inspection, final inspection, packed and transported examine, Personnel, instrument and equipment control and subpackage, cooperation part inspection etc..
For the technology controlling and process of entire engineering:
(1) using tooled joint tooling carry out steel pipe circle and circumferential weld press fitting, forbid using on tube wall any welded attachment into Row group circle and tooled joint.
(2) cold working and untrained welder is forbidden to carry out a group round tack welding.
(3) when removing tube wall attachment, the injury to base material should be avoided.
(4) fished pipe tube coupling should take reliable bearing, and with anti-deformation, the lumps of wood or concrete buttress are (liftoff when stacking Face 200mm or more).
(5) when steel pipe transmission, pallet for transporting is made, binding scheme is made, forbids directly to bind steel pipe with wirerope, really It is padded using wooden unit when need to bind, with antisitic defect sprayed surface.
In quality inspection and acceptance:
1) quality examination
Quality examination includes the work in raw material inspection, production quality inspection, anticorrosive quality inspection etc. and process control Quality examination between sequence.Steel, welding material, connector and coating material needed for steel pipe manufacture and installation etc. should all be by related skill Art clause and EJMA specification are tested and are checked and accepted.Should reinforce steel pipe production, welding and preservation process in each key procedure with And the self-test work after the completion of manufacture, quality examination is submitted after qualified and checks and accepts data.
2) detection record
Detection record is the important means for supervising constructor to pay attention to quality, and the important evidence of evaluation construction quality.Often A constructor, Quality Inspector and administrative staff will conscientiously fill in practical and realistic.Accomplish all information, does not leak item, restraining of stretching The quality testing record content of work see the table below.
Telescopic joint production quality scope of examination table
For from manufacturing process:
(1) component blanking and processing
The inside and outside casing of Bellows expansion joint and pressing ring tile fragment blanking are using scribing line by hand, semi-automatic cutting, outer tube and pressure The ring flat-plate of circle is cut with numerical control cutting machine, carries out polishing finishing with abrasive machine after cutting, and straight portion is dug using edge planer Side, specific tolerance are met the requirements.
(2) roll bending and inspection
The components tile fragment roll bending such as inside and outside casing, pressing ring, end ring, first production inspection template, tile fragment complete the process on inspection It carries out roll bending after qualification, after roll bending, tile fragment is freely stood on rigid plane, water (flow) direction checks radian, sample upward, with template ≤ 3mm is answered in the gap of plate and tile fragment, is not allow for sharp turn, while should carry out ground sample inspection, tile fragment to tile fragment in a free state With ground sample phase tolerace 3mm.
(3) component groups circle is assembled
First rigid plane is leveled up before the inside and outside pipe sleeve and pressing ring of telescopic joint are assembled, guarantee rigid plane levelness a≤ Tile fragment is hung and carries out assembly by radius requirement (+2mm~+4mm) on rigid plane by 2mm, is in free shape when welding longitudinal joint State.Longitudinal joint point with template checks commissure radian after being soldered, and≤3mm is answered in template and tile fragment gap；Check radius, perimeter, upper tube Mouthful horizontal saliva is flat, height, nozzle concentricity, template and tile fragment gap, and passed examination is simultaneously welded after reinforcing reserved longitudinal joint.
(4) Member Welding
Welding method: the longitudinal joint of inner sleeve, outer tube, the butt weld and fillet weld of end ring, reinforcing ring, pressing ring are indulged Seam, the butt weld of adapter tube and lifting lug use welding rod manual electric arc welding and submerged arc welding；The welding of bellows all uses tungsten Electrode argon arc welding；The welding of the other components such as weld seam of ring flat-plate, the circumferential weld of retaining ring, gusset is welded using welding rod manual electric arc welding.
Welding contracted quantity and welding quality control measure: each component must be strictly controlled perimeter when making, therefore assembly must Enough welding allowances for shrinkage must be reserved, and reserve 1 longitudinal joint in longitudinal seam welding to weld, circle to be strengthened is welded with adapter tube After the completion, it checks and is welded again after tube coupling perimeter meets design requirement；To control welding deformation, sample is used at any time in welding process Plate checks the radian of tube coupling and changes adjustment welding sequence according to radian；The welding of ring flat-plate, stiffening ring, stiffened panel, water seal retaining ring Several equal portions are first divided into, positioning is then carried out and reinforces weldering, by 6 welders welding simultaneously when formal welding, when welding strictly presses pre- The welding procedure and position of halving first formulated control welding deformation using means such as skip welding and multi-pass weldings.
(5) bellows assembling and welding
In bellows assembling process, bellows is the critical component of telescopic joint production, telescopic joint bellows assembling process It is required that:
Completely by inner sleeve and the surface derusting of end ring assembling, butting grooves cleaning, polishing；
Bellows bound using special hanger carry out on suspender lifting it is in place, with cork filler strip support pad, using fixture Close up bellows, and prevents that electric arc causes to puncture to it；
It adjusts bellows and inner sleeve, end ring gap is uniform, and be close to, argon tungsten-arc welding carries out spot welding by hand.Spot welding When with "painted-face" character in opera hammering beat, be adjacent to bellows with inner sleeve and outer tube end ring；
Point is soldered first bottoming, argon tungsten-arc welding bottom welding by hand, is then beaten with "painted-face" character in opera hammering, make bellows with it is interior Casing and end ring are adjacent to, and are then welded and are examined by technique.
During bellows-welding, bellows-welding technique is required as shown in figure 3, bellows-welding all uses tungsten electrode Argon arc welding.Design parameter is as follows,
Bellows-welding parameter list
(6) water pressure test
For the structure design of the quality, verifying telescopic joint of examining Bellows expansion joint to make, after telescopic joint completes The water pressure test is carried out to bellows as required.
Method particularly includes: utilize 40mm, material is that Q345R plate volume is set to and suppresses steel plate (outer diameter is flexible less than bellows Saving internal diameter is about 20mm), it is inserted in inside telescopic joint, and 10mm technique backing plate is added between the two, then carries out suppressing test.It surveys It is cut off after the completion of examination using carbon arc air gouging and suppresses steel band, and integrally polished.It can avoid injury base material.Point Upstream section and tract into Row hydraulic test.
It is suppressing in steel plate, reinforcement is supported using doughnut-shaped steel plate, is easy to implement, material economy, reinforcing ring and branch It supports reusable.The sectional that such as goes wrong carries out repairing and repair welding.
As shown in figure 4, considering that the economic cost for suppressing inner sleeve is fought each other using " external pressure cylinder is arranged stiffening ring and calculates " Pressure inner sleeve does wall thickness reduction and increases stiffening ring and reinforce the design of support.
(7) sealing performance: the sealing performance of telescopic joint should be tested by air-tightness or kerosene leak test, and test is answered Meet Section of 7.2 requirement of EJMA, test result should meet following requirements.
Test(ing) medium is clean air, and the design pressure that test pressure is 1.0 times slowly boosts to the examination of design code After testing pressure and holding pressure 10min, ne-leakage is answered on inspection.
(8) sequence is suppressed:
A. normal-temperature water is injected, access is suppressed equipment and suppressed after filling.
B. sealing test: being suppressed using hydraulic test pump, when pressure reaches 1.65MPa, closes water injection valve, pressure maintaining 10min carries out comprehensively careful visual circular test to wave shell surface and its longitudinal seam, girth joint using 5 times of magnifying glasses.
C. hydraulic pressure test: after the sealing test of 1.65MPa, water injection valve is opened, hydraulic pressure is slowly rushed on 1.65MPa 2.5MPa is risen to, then turns off water injection valve, pressure maintaining 20min, this again with 5 times of magnifying glasses, to wave shell surface and its is indulged in the process Weld seam, girth joint carry out comprehensively careful visual circular test, no to seep water, without deformation.
Embodiment 3:
A kind of welding material, the welding material by mass percentage, are made of following chemical component: C≤0.5%, Cr 16.0~18.0%, Fe 6.0~10.0%, Mn≤1.0%, Nb 1.5~3.0%, Si 0.6~1.0%, S≤ 0.015%, P≤0.015%, Ni >=70.0%, k≤0.015%.
Further, the welding material by mass percentage, is made of following chemical component: C 0.3%, Cr 16.8%, Fe 7.2%, Mn 0.4%, Nb 2.45%, Si 0.85%, S0.002%, P 0.002%, K 0.002%, Ni Surplus.
Further, the welding procedure used when being welded using welding material is selected from gas metal-arc welding, non-melt Pole gas shielded arc welding or automatic welding, it is preferred to use non-consumable gas shielded arc welding technique.
The connection type of welding machine and welded specimen is straight polarity direct current.Welding process the following steps are included:
(1) groove face of sample to be welded is cleaned out, cleaning drying is kept, then by groove according to above-mentioned V-type Then docking mode docking is led to argon gas and is protected with the fixed good position of spot welding；
(2) bottom welding, welding current 100A, voltage 12V, weldering speed 0.8mm/s, weldering full two are carried out to welded specimen Layer；
(3) weldering and cosmetic welding, welding current 100A, voltage 13V, weldering speed 1.0mm/s are filled.
Embodiment 3 (comparison)
Wlding in embodiment 3 is modified to the ERNiCr-3 welding wire that diameter is φ 2.4mm, other conditions are constant.
Embodiment 4 (comparison)
Wlding in embodiment 3 is modified to the ERNiCr-3 welding wire that diameter is φ 2.4mm, other conditions are constant.
Performance test
1, according to JB/T4730.5-2005, Liquid penetrant testing (PT) is carried out to face of weld
As the result is shown: the face of weld of embodiment 1-4 does not find the defects of crackle, stomata, undercut, meets JB/ T4730.5-2005I grades of requirements.
2, according to JB/T4730.2-2005, ray detection (RT) is carried out to weld seam
As the result is shown: the weld seam of embodiment 1-4 does not find any defect, meets JB/T4730.2-2005I grades of requirements.
3, according to GB/T228-2010, the test of room temperature (25 DEG C) tensile property is carried out to sample sampling
Test result is as shown in table 1.
1 room temperature tensile test result of table
Sample Tensile strength Fracture position
Embodiment 1 620MPa Base material
Embodiment 2 585MPa Base material
Embodiment 3 625MPa Base material
Embodiment 4 575MPa Base material
Above-mentioned test result shows that the sample of embodiment 1-4 is met the requirements of the standard.Welding material of the invention with ERNiCr-3 is roughly the same in the ambient temperature mechanical properties for being applied to show when ZG50Ni45Cr35NbM welding.
4, according to GB/T232-2010, to sample and side bend test test is carried out
As the result is shown: not finding crackle, meet GB/T232-2010 requirement.
5, sample is carried out at 670 DEG C according to GB/T4338-2006 " Metal Materials At High Temperature stretching test method " High temperature, short time Mechanics Performance Testing
Specific test process is as follows: according to standard requirements processed sample, sample being then fixed on WDE-300B with fixture block On high temperature universal testing machine, temperature is then increased to 670 DEG C；Temperature is kept, load is slowly increased, until sample fracture.
The intensity and fracture position loaded when record fracture, the results are shown in Table 2.
Table 2 is in 670 DEG C of extension test results
Sample Tensile strength at 670 DEG C Fracture position
Embodiment 1 480MPa Base material
Embodiment 2 473MPa Base material
Embodiment 3 410MPa Weld seam
Embodiment 4 400MPa Weld seam
From the results shown in Table 2, at 670 DEG C, using ERNiCr-3 is the sample of wlding 400MPa's or so Weld seam is just broken under drawing force；And the sample of wlding disclosed by the invention is used, even if being more than the stretching of 450MPa Power effect under, in the case where base material has been broken, weld seam is not also broken.Should the result shows that, the welding material as bellows Material, welding material disclosed by the invention are far superior to ERNiCr-3 in terms of mechanical behavior under high temperature.
In summary, for welding material of the invention when being used for bellows-welding, gained weld seam not only has good table Face pattern and ambient temperature mechanical properties, and there is the mechanical behavior under high temperature significantly improved.This can greatly promote the matter of product Amount, and good impetus can be played to application of the extended products under various hot environments.
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not office Be limited to form disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification and Environment, and can be changed within that scope of the inventive concept describe herein by the above teachings or related fields of technology or knowledge It is dynamic.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be appended by the present invention In scope of protection of the claims.

Claims (10)

1. a kind of welding procedure of bellows, which comprises the following steps:
Step 1: welding characteristic research；
Step 2: welding material and welding procedure are formulated；
Step 3: welding；
Step 4: quality control, the quality control includes technical work, technology controlling and process and quality inspection and acceptance.
2. the welding procedure of bellows as described in claim 1, which is characterized in that the welding characteristic research is pair The chemical component and its Study on Mechanical Properties of 07MnMoVR high-strength steel.
3. the welding procedure of bellows as claimed in claim 2, which is characterized in that the 07MnMoVR high-strength steel Mn content is 1.2%~1.6%, tensile strength reaches 630~730MPa.
4. the welding procedure of bellows as described in claim 1, which is characterized in that the welding procedure is welding electrode arc welding And/or argon tungsten-arc welding and/or submerged-arc welding.
5. the welding procedure of bellows as claimed in claim 4, which is characterized in that the longitudinal joint groove of the welding procedure is nothing The asymmetric X-shaped in the 1/3 of root face, bevel angle are 60 °, are processed using 12 edge planers, and circumferential weld groove is the symmetrical X-shaped of 2mm root face, Bevel angle is also 60 °, is machined using semi-automatic cutting.
6. the welding procedure of bellows as claimed in claim 5, which is characterized in that the welding procedure is in addition to girth joint, Run-on tab should be set.
7. the welding procedure of bellows as claimed in claim 6, which is characterized in that the run-on tab includes lead-in plate and extraction Plate.
8. a kind of welding material, which is characterized in that the welding material by mass percentage, is made of: C following chemical component ≤ 0.5%, Cr 16.0~18.0%, Fe 6.0~10.0%, Mn≤1.0%, Nb 1.5~3.0%, Si 0.6~1.0%, S≤0.015%, P≤0.015%, Ni >=70.0%, k≤0.015%.
9. welding material as claimed in claim 8, which is characterized in that the welding material by mass percentage, by following Chemical component composition: C 0.3%, Cr 16.8%, Fe 7.2%, Mn 0.4%, Nb 2.45%, Si 0.85%, S 0.002%, P 0.002%, k≤0.002%, Ni surplus.
10. welding material as claimed in claim 8, which is characterized in that the welding procedure used when being welded using welding material Selected from gas metal-arc welding, non-consumable gas shielded arc welding or automatic welding, it is preferred to use non-consumable gas shielded arc welding work Skill.
CN201811264469.0A 2018-10-29 2018-10-29 A kind of welding procedure of bellows Pending CN109396610A (en)

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CN111408909A (en) * 2020-05-08 2020-07-14 安徽伟宏钢结构集团股份有限公司 Production welding process for forged steel parts
CN114247961A (en) * 2020-09-21 2022-03-29 江苏利柏特股份有限公司 Method for welding and heat treating SA-335P11 and SA-240TYPE310S dissimilar steel

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Application publication date: 20190301