CN110216361A - A kind of sucked type vertically fixes submerged-arc welding welding in storage tank method - Google Patents
A kind of sucked type vertically fixes submerged-arc welding welding in storage tank method Download PDFInfo
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- CN110216361A CN110216361A CN201910544771.XA CN201910544771A CN110216361A CN 110216361 A CN110216361 A CN 110216361A CN 201910544771 A CN201910544771 A CN 201910544771A CN 110216361 A CN110216361 A CN 110216361A
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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
- B23K9/18—Submerged-arc welding
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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
- B23K9/235—Preliminary treatment
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Abstract
The present invention relates to a kind of sucked types vertically to fix submerged-arc welding welding in storage tank method.Storage tank top siding opens up circumferential weld groove；It is cleared up before weldering by groove and nearby；Sucked type track is fixed on to the top of circumferential weld groove in tank wall, vacuum cap type track is fixed on to the top of circumferential weld groove in tank wall, vacuum cap type track is parallel with circumferential weld, walking dolly is mounted on vacuum cap type track, submerged arc welding machine is fixed on walking dolly, welding wire, flux hopper are respectively fixed in the support frame two sides that welding wire is loaded on submerged arc welding machine, the welding gun of submerged arc welding machine is fixed on walking dolly, the muzzle of submerged arc welding machine welding gun is directed at weld seam, and walking dolly is moved along track and welded around siding to storage tank.It solves the problems, such as that the generation of welding defect, wall-hanging horizontal position welding machine equipment heaviness is easy to cause to be not suitable for upside-down construction in the welding process of storage tank inversion.Improve welding quality.
Description
Technical field
The invention belongs to submerged arc welding technique fields, and in particular to a kind of sucked type vertically fixes submerged-arc welding welding in storage tank side
Method.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty
It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art
Art.
Lincoln weld can only rotate weld bond in pipeline, Lincoln weld is suitble to downhand position in pipeline welding process
It uses, but is not able to satisfy the needs of the vertical fixing port all-position welding of pipeline.
Storage tank inversion refers to using storage tank bottom as benchmark plane, top layer siding and storage tank tank deck is first installed, then from upper
And lower layer-by-layer siding assembly welding and jack up, alternately, successively until construction method that bottom siding installs.Storage tank falls
Influence of the dress method process to conventional automatic welder equipment is particularly important, in using storage tank inversion hair construction, usually used extension
Wall type horizontal position welding machine needs are hung on tube wall, inventors have found that being not suitable for upside-down construction, simultaneously due to welding equipment heaviness
It is influenced by field work natural wind, it is stringenter to draught exclusion device using conventional welding method, it is easy to cause welding defect
Generation, process is relatively complicated, increases construction cost, and reducing efficiency can not meet the demand of engineering construction.
Summary of the invention
For above-mentioned problems of the prior art, it is an object of the present invention to provide a kind of sucked types vertically to fix
Submerged-arc welding welding in storage tank method.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
A kind of sucked type vertically fixes submerged-arc welding welding in storage tank method: the vertical Lincoln weld new process of sucked type；
Storage tank top siding opens up circumferential weld groove；First bevel is cleared up again；
It is cleared up before weldering by groove and nearby；
Vacuum cap type track is fixed on to the top of circumferential weld groove in tank wall, vacuum cap type track and circumferential weld are flat
Row, walking dolly are mounted on vacuum cap type track, and submerged arc welding machine is fixed on walking dolly, and welding wire is loaded on submerged arc welding machine
Support frame two sides respectively welding wire, flux hopper it is fixed on, the welding gun of submerged arc welding machine is fixed on walking dolly, submerged arc welding machine
The muzzle of welding gun is directed at weld seam, and walking dolly is moved along track and welded around siding to storage tank；
During welding, old solder flux is added in welding machine funnel, mass percent >=50% of new solder flux, old solder flux
Mass percent < 50%.
Submerged arc welding machine is loaded on walking dolly by the present invention by vacuum type sucked type track, makes walking dolly along ring
Seam is welded, and is solved the problems, such as that Lincoln weld can only carry out downhand welding, is realized vertical fixing port all-position welding, solder flux
It is transported to welding gun, subsequently into molten bath, the effective solution influence of outdoor wind welding quality avoids construction site high-altitude
Interference of the operation wind to molten bath, caused by welding defect, improve welding quality and construction efficiency.
During welding, old solder flux is mixed with new solder flux manually.Old solder flux is the solder flux recycled after welding.
Old solder flux and new solder flux carry out being used in mixed way the generation for reducing stomata.Principle are as follows: vertical fixed submerged-arc welding is in storage tank
In welding, welding wire and solder flux dissolve after under the high temperature action in molten bath, since the granularity of solder flux is uneven, poor air permeability melts
Gas in pond has not enough time to overflow, and bubble is formed in weld seam, is influenced to remain in metal inside formation gas by metallic crystal
Hole.Solder flux not enough generates open arc to the cladding thickness in molten bath.The granularity of bond flux selects suitable welding parameter, before use
It is toasted according to relevant standard, the old solder flux and new solder flux to recycling stir use by a certain percentage, reduce stomata
It generates.
Preferably, use electric angle grinder sundries such as greasy dirt, splashing, oxide skins within the scope of groove and two sides 20mm before weldering
It cleans out.
Preferably, temperature is no more than 150 DEG C between road in welding process, shortens during welding in 450~850 DEG C of temperature
Residence time in range.
Using layer thin point, string(er) bead, the weld seam cooling means for improving speed of welding, the process of welding during welding
Middle shortening is most sensitive to intercrystalline corrosion after heating in 450~850 DEG C of temperature ranges, when shortening the stop of sensitizing temperature section
Between.Temperature influences the intergranular corrosion resistance performance of weld seam between road, and the operating method in welding process helps to improve weldquality, mentions
High welding efficiency.
Preferably, storage tank is austenitic stainless steel TP304 material, and the wall thickness suitable for storage tank is 8-60mm.
The advantages of austenitic stainless steel TP304: intergranular corrosion resistance and resistance to intergranular stress corrosion are functional, plasticity and toughness
Preferably, heat-resisting, corrosion resisting property is preferable, have preferable weldability.
The shortcomings that austenitic stainless steel TP304: austenitic stainless steel TP304 poor heat conductivity increases welding deformation, constrains
The cooling velocity of weld seam is easily reduced the heat affected area corrosion resistance of weld seam, and thermal coefficient is small, and linear expansion coefficient is big.In office
Under conditions of portion is heated or cooled, tensile stress and deformation are likely to form in welding point.
When welding, after TP304 austenitic stainless steel stops in heating temperature (450-850 DEG C) range, austenite grain
Interior C is to grain boundary decision, and in conjunction with neighbouring Cr, intercrystalline precipitation, the Cr in crystal grain has little time to supplement, and it is chromium depleted intergranular occur
Phenomenon.Under the action of corrosive medium, intergranular corruption is just produced.
Austenite grain boundary is precipitated chromium carbide and causes crystal boundary chromium depleted, due to stainless steel TP304L thermal conductivity very little, seriously affects
The cooling velocity and welding quality of weld seam, so heat affected area corrosion resistance is easy decline.
The high directivity of dendrite in austenitic stainless steel weld joint is conducive to the segregation of low-melting impurities and gathering for crystal grain defect
Collection, along with the thermal conductivity of this steel is poor, makes weld metal zone form the biggish temperature difference and shrinkage stress, is easy to generate in weld seam
Fire check, especially crater crack.
Preferably, the groove of top siding is " K " type, and the angle of groove is 45 ± 2.5 °, lower part siding square groove.Under
Portion's siding square groove falls under the influence of by molten iron gravity, can drag to solder flux convenient for vertical fixed Lincoln weld in welding
Effect is applied, guarantees welding procedure quality.
Bevel angle is big, and weld seam filling metal amount is big, increases welding deformation amount；Bevel angle is small, end of welding when side is welded
The defects of root big less than prime coat is goed deep into portion, is easy to produce incomplete fusion slag inclusion.
According to the increase of wall thickness, bevel angle is gradually increased；Lower part siding square groove, it is automatic convenient for vertical fixed submerged arc
It is fallen when being welded in welding, under the influence of by molten iron gravity, deposited effect can be dragged to solder flux, guarantee welding procedure quality.
Preferably, the lower groove indwelling 0.5mm-1mm of tube wall.
To every layer of upper groove angle there are different gentle slopes, too small angle is easy to cause bottom weld seam with new layer
The defects of slag inclusion, incomplete fusion.The case where according to every layer of welding.Adjustment welding wire angle in time, reasonable multilayer multiple working procedure, filling
Layer it is levelling, stay the side of 0.5~1mm in tank skin circumferential weld lower edge groove, reduce and made by the gravity of electric arc heat effect liquid metal
With flowing, appearance of weld is more satisfactory.
Upper groove and lower groove refer to above and below weld seam opening.
Preferably, weldingvoltage 30-33.5V.
When the upper limit of the weldingvoltage beyond the welding procedure range formulated, the width of weld seam is increased, and arc burning is unstable
Calmly, a possibility that fusion area generation slag inclusion, incomplete fusion, increases, and brownout is then easy to appear current interruption phenomenon.It is stainless steel welded
The control of temperature is under the premise of guaranteeing welding quality, should to select small weld heat input as far as possible between middle road, the temperature of weld seam compared with
Height increases the aggregation of welding deformation and stress, too small, is easy to interfere molten bath crystallization effect, weld width is inadequate, bath temperature
Excessively high that molten bath is made to trickle, weld seam incomplete fusion, excessive then fusion penetration are shallow, welding quality unstable.
Preferably, welding current 220-290A, welding current are directly proportional to voltage.
The stainless steel storage tank girth welding of selection in to(for) welding current is more stringent, because stainless steel thermal conductivity is slow, liquid
State molten pool metal is dilute, good flowing properties, is influenced to be easy tenesmus by gravity, is difficult to control.Welding current and weldingvoltage
Directly proportional, increasing welding current can be improved the speed of wire melting, and welding efficiency is promoted, but be easy to cause breakdown weld seam and reinforcement
Exceeded, too small welding current easily causes interlayer and sidewall fusion bad, weld metal discontinuity, and arc burning is unstable.
Preferably, the stem elongation degree of welding wire is 10-15mm.
Dry extension of electrode degree is particularly evident to the stability influence of welding arc.When the stem elongation degree of welding wire increases, then
Welding wire resistance heat increases, and accelerates the burn-off rate of welding wire, and the reinforcement of weld seam increases, and dry extension of electrode spends short, easy scaling loss
Ignition tip.The stem elongation degree of welding wire increases with the increase of gage of wire.Welding parameter is constant and when gage of wire increases, weldering
Slit width degree increases, and fusion penetration reduces.Conversely, then fusion penetration increases and weld width reduces.Welding parameter is constant and electrode extension
When increase, resistance is also increased with it, and pre- heat effect suffered by extension welding wire increases, and welding wire melting rate is accelerated, as a result
Fusion penetration is set to shoal, weld reinforcement increases, and strict control welding wire stretches out the length of ignition tip.
Preferably, the diameter of welding wire is 1.6mm or 2mm.
The selection of gage of wire is affected to quality inside and outside weld seam, in conjunction with the different material in construction site, different walls
The actual conditions of thick welding, if welding wire is excessively thick, required welding current increases, and by the effect of bearing down, liquid state molten pool is downward
Stream, welding wire is meticulous, be easy to cause welding arc unstable, weld seam lack of fusion, welding quality stable.
Preferably, welding wire is vertical with weld seam, and the angle of welding wire and tube wall is 85~90 °.
Guarantee that fusion is good between weld seam or more the road tube wall groove Ji Daoyu, avoids undercut and incomplete fusion from generating, in weld seam
Outer quality is met the requirements of the standard.
Preferably, speed of welding is 80cm/min~90cm/min.
Speed of welding is between 80-90cm per minute.
Speed of welding is influenced in the welding process for stainless steel hot layer by material weld characteristics, and weldering degree is slightly fast,
The control of temperature between being conducive to, excessive weld heat input be easy to cause intercrystalline corrosion, prevent from puncturing prime coat in welding
Weld seam and sealing run oxidation, the speed of speed of welding overflow through welding to be demonstrate,proved, slag, gas to reduce folder sufficiently from welding bead
The defects of slag, stomata.Can accordingly it slow down in filled layer, lid capping pass speed, excessively slow welding bead cooling time is very short, is easy handle
Trace alloying element scaling loss in weld seam, reduces the comprehensive performance of weld seam, causes gas residue in welding bead and forms stomata,
It is bad easily to there is welding bead molding for accumulation thickening under liquid.
Preferably, using multi-pass welding, welding flux layer with a thickness of 2~4mm, welding point mutually staggers 30-50mm.
In stainless steel storage tank welding process, strict control is wanted for the thickness of layer, blocked up layer is especially filled
First layer, welding slag are not easily cleaned, and are easy to produce incomplete fusion, simultaneously because stainless steel poor thermal conductivity, the big characteristic of resistance, increase
Weld heat input causes coarse grains, generates defect.
Influence of the thickness of welding flux layer for bead contour and fusion penetration is prominent in welding, and when welding flux layer is excessively thin, electric arc is revealed
Out, the defects of molten bath protection is bad, and weld penetration is shallow, easily generates stomata, blocked up welding flux layer, fusion penetration increases, appearance of weld
Difference.Welding flux layer it is too thin or it is too thick all can cause pit, spot and stomata in face of weld, form rough weld bead shape.
A kind of sucked type vertically fixes submerged-arc automatic welding device, including, vacuum cap type track, walking dolly, wire reel,
Flux hopper, welding gun, welding machine, walking dolly are mounted on vacuum cap type track, and it is small that wire reel, flux hopper are fixed on walking
One end of vehicle, the opposite other end are fixedly connected with welding gun, and wire reel and welding gun are located at the two sides of vacuum cap type track, weldering
Rifle is connect with welding machine, and welding machine is fixed on the top of walking dolly.
Preferably, welding gun is connect with flux hopper by Thermostable flexible hose.
It preferably, further include welding recyclable device, positioned at the lower section of welding gun.
It preferably, further include control cabinet, one end of walking dolly is arranged in control cabinet, and control cabinet is located at vacuum cap type rail
The top in road.
Beneficial effects of the present invention:
Sucked type vertically fixes submerged-arc welding and manual arc is welded in stainless steel storage tank girth welding efficiency analysis, with thickness of pipe wall
It spends for 18mm butt weld, the thickness that vertical fixed submerged-arc welding need to only fill 9 can meet relevant welding inspection standard,
And manual electric arc welding needs 16 filling cover weldings, vertical fixed submerged arc welding speed 80cm/mi~90cm/mi, manual electricity
Arc welding speed is 50cm/mi~60cm/mi.Submerged-arc welding wire is lost 3 meters or so, loses small, it can be achieved that continuous welding, subtracts
Connector is welded less, welding efficiency is fast, and welder's operation is convenient, mitigates degree before labour, reduces cost of labor.Manual electric arc welding is to work
Skill is more demanding, and a such as electrode can continuously weld 90mm~100mm, and welding point is more, and welding point is welding matter again
Most weak link in amount, the time of welding rod replacement and electric resistance of stainless increase greatly wlding consumption, realize storage tank inversion
Welding procedure is sent out, effect improves about 3~4 times compared with manual welding.From the loss of wlding, the skull after melting in welding process is not easy clearly
Reason, shortens the cleaning work to layer.
Welding in storage tank construction, is concentrated mainly on construction site, is affected by a natural, the stability of welding quality for
The welding method of selection is most important, submerged-arc welding is vertically fixed using sucked type of the invention improves field and do one's assignment wind resistance energy
Power reduces the labor intensity of manipulator, improves welding efficiency；
The fixed submerged-arc welding of tray vertical is that sucked type track is fixed on tube wall to weld, and is installed additional on walking dolly
Flux delivery system, flux collection system is installed on welding gun, to unfused flux restoring, it can be achieved that continuous welding, drop
Low construction cost.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present application, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is the schematic diagram of groove；
Fig. 2 is the structural schematic diagram that sucked type vertically fixes submerged-arc automatic welding device；
Wherein, 1, vacuum cap type track, 2, sucker, 3, walking dolly, 4, wire reel, 5, flux hopper, 6, welding gun, 7,
Submerged-arc welding machine, 8, Thermostable flexible hose, 9, welding recyclable device, 10, control cabinet, 11, support frame, 12, weld seam.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Welding equipment uses CH-500Pro (including the source of welding current, walking dolly, control cabinet, control system, vacuum chuck
Track), welding tractor operates hand-held remote controller, it can be achieved that programming, system setting, machine along vacuum chuck track travel, welder
The operation needed in all welding processes such as head movement, for walking dolly regardless of left and right vehicle, equipment operation is simple, and device housings are hard
Gu being convenient for transition.
Wall-hanging horizontal position welding, Lincoln weld application in welding in storage tank is universal, and technique is more mature, but for storing up
It is just restricted by welding position in the hyperbatic construction of tank, can not meet Automation of Welding by conventional welding equipment and become
Gesture on the basis of constructing in conjunction with construction site welding in storage tank to the vertical fixing port all positon Lincoln weld of original rail mounted, installs additional
Sucked type track is fixed on tube wall and welds, and realizes continuous welding by increase and decrease sucker track, realizes storage tank inversion hair welding
Construction, while different solder flux toolings is made to different storage tanks to flux delivery and recycling tooling reformed AHP, sufficiently send out
The fixed Lincoln weld of the sucked type advantage strong in storage tank inversion and field work wind loading rating is waved, welding quality is improved and applies
Work efficiency rate realizes the welding of automation flowing water and production.
The main component and ambient temperature mechanical properties of austenitic stainless steel TP304 in the present invention in the following examples is analyzed
It is as follows:
1 TP304 stainless steel main chemical compositions (%) of table
| C | Mn | P | S | Si | Ni | Cr |
| 0.056 | 1.43 | 0.006 | 0.021 | 0.30 | 9.45 | 19.84 |
The mechanical property (%) of 2 TP304 stainless steel of table
Welding wire for submerged-arc welding uses CHW-308R in following embodiments, and specification isSolder flux trade mark CHF601R,
Specification 10-60 mesh.Weld metal is applied in combination with good mechanical property and anti intercrystalline corrosion performance, weld seam cracking resistance is good
It is good.
3 welding material main chemical compositions of table
As described in the background art, traditional horizontal position welding machine is suitble to storage tank upright method of hull section construction, and equipment needs simultaneously than cumbersome
It largely mating auxiliary tool, vertical fixed submerged-arc welding of the invention to solve the problems, such as are as follows:
1) the welding problem of storage tank inversion, welder only need remote controller, observation to bit line and flux delivery situation with
Track, so that it may complete welding；
2) angle of welding gun, welding the characteristics of fixing port all positon Lincoln weld vertical according to rail mounted, to welding equipment
The adjustment such as speed, wire feed rate, weldingvoltage, dry extension of electrode degree, has expanded especially with the characteristics of sucked type track and has hung down
Application range of the straight Lincoln weld in welding in storage tank construction；
3) reformed AHP has been carried out to the tooling of solder flux laying, recovery system, has reduced the labor intensity of welder, that is, improves
Construction efficiency, and welding quality stable is reliable；
4) generation of stomata is reduced；
5) it reduces slag inclusion and improves welding quality；
Submerged-arc welding electric arc is burnt under solder flux, and manipulator is not easy to observe the variation in molten bath, and when welding, there are one for welding gun
Fixed shift phenomenon melts the fast slag of metal cooling velocity between the road Dao Yu, in welding and has little time emersion, and welding current is small,
Weldering speed is too fast, and welding bead cleaning is clean etc. to cause slag inclusion.Suitable welding parameter especially is used in hot weld layer, is adjusted using contraposition
Rectifier adjusts angle of welding gun in time, effectively improves welding quality.
6) overcome the problems, such as incomplete fusion.
When welding, groove and filling metal between or welding bead do not fuse together sufficiently, first layer hot weld due to
Gap is small, and welding current and weldingvoltage mismatch, and the hot accumulation in molten bath there is no enough fusion penetrations, on welding tube wall
When groove side, angle is too deep, and bottom etc. is not achieved after wire melting and generates incomplete fusion.Using welding current appropriate and welding
Speed controls the angle degree between layer, overcomes the problems, such as incomplete fusion.
7) reduce the generation of crackle
It in stainless steel storage tank welding, is influenced by stainless steel characteristic, crosses greatly welding current, increase sealing wire energy
Amount, promotes coarse grains, the microelement scaling loss in weld seam reduces comprehensive performance.Fusion penetration is increased, is received cold by thermal expansion when arc
The influence of contracting stops stress and deformation at arc and increases, causes crater crack.Under the premise of guaranteeing welding quality, as far as possible using small
Heat input, controls the depth in molten bath, and layer shunting is orderly.
The disclosure is further illustrated below with reference to embodiment
Embodiment 1
On storage tank top, siding opens up circumferential weld groove, and storage tank wall thickness 16mm opens " K " type, and the angle of groove is 45 ± 2.5 °,
The lower groove indwelling 0.5mm of tube wall；
The sundries such as greasy dirt, splashing, oxide skin within the scope of groove and two sides 20mm are cleared up using electric angle grinder before weldering and are done
Only；
Sucked type track is fixed on to the top of circumferential weld groove in tank wall, walking dolly is fixed on sucked type track,
The solder flux tooling of submerged arc welding machine is fixed on walking dolly, and welding wire is loaded in solder flux tooling, and the diameter of welding wire is
The stem elongation degree of 1.6mm, welding wire are 10mm, and walking dolly is moved along track and welded around siding to storage tank, welding
It will be mixed at the old flux delivery to new solder flux of recycling with new solder flux in the process, welding current 220-270A, weldingvoltage is
30-31V, temperature is no more than 150 DEG C between road in welding process, and welding wire is vertical with weld seam during welding, welding wire and tube wall
Angle is 85 °, speed of welding 80cm/mi, welding flux layer with a thickness of 2mm, welding point mutually staggers 30mm.
Embodiment 2
On storage tank top, siding opens up circumferential weld groove, and storage tank wall thickness 36mm opens " K " type, and the angle of groove is 45 ± 2.5 °,
The lower groove indwelling 0.8mm of tube wall；
The sundries such as greasy dirt, splashing, oxide skin within the scope of groove and two sides 20mm are cleared up using electric angle grinder before weldering and are done
Only；
Sucked type track is fixed on to the top of circumferential weld groove in tank wall, walking dolly is fixed on sucked type track,
The solder flux tooling of submerged arc welding machine is fixed on walking dolly, and welding wire is loaded in solder flux tooling, and the diameter of welding wire is
The stem elongation degree of 1.6mm, welding wire are 13mm, and walking dolly is moved along track and welded around siding to storage tank, welding
It will be mixed at the old flux delivery to new solder flux of recycling with new solder flux in the process, welding current 240-280A, weldingvoltage is
32-33V, temperature is no more than 150 DEG C between road in welding process, and welding wire is vertical with weld seam during welding, welding wire and tube wall
Angle is 88 °, speed of welding 85cm/mi, welding flux layer with a thickness of 3mm, welding point mutually staggers 40mm.
Embodiment 3
As shown in Figure 1, the positive figure of weld seam, on storage tank top, siding opens up circumferential weld groove, and storage tank wall thickness 36mm opens " K "
Type, the angle of groove are 45 ± 2.5 °, the lower groove indwelling 1mm of tube wall；
The sundries such as greasy dirt, splashing, oxide skin within the scope of groove and two sides 20mm are cleared up using electric angle grinder before weldering and are done
Only；
Sucked type track is fixed on to the top of circumferential weld groove in tank wall, walking dolly is fixed on sucked type track,
The solder flux tooling of submerged arc welding machine is fixed on walking dolly, and welding wire is loaded in solder flux tooling, and the diameter of welding wire is 2mm,
The stem elongation degree of welding wire is 15mm, and walking dolly is moved along track and welded around siding to storage tank, during welding
It will be mixed at the old flux delivery to new solder flux of recycling with new solder flux, welding current 230-290A, weldingvoltage 31-
33.5V, temperature is no more than 150 DEG C between road in welding process, and welding wire is vertical with weld seam during welding, the folder of welding wire and tube wall
Angle be 90 °, speed of welding 90cm/mi, welding flux layer with a thickness of 4mm, welding point mutually staggers 50mm.
Embodiment 4
Welding machine is submerged-arc welding machine.
As shown in Figure 2, a kind of sucked type vertically fixes submerged-arc automatic welding device, including, vacuum cap type track 1, walking
Trolley 3, wire reel 4, flux hopper 5, welding gun 6, submerged-arc welding machine 7, walking dolly 3 are mounted on vacuum cap type track 1, weldering
Wire tray 4, flux hopper 5 are fixed on one end of walking dolly 3, and the opposite other end is fixedly connected with welding gun 6, wire reel 4 and welding gun 6
The two sides of vacuum cap type track 1 are located at, welding gun 6 is connect with submerged-arc welding machine 7, and it is small that submerged-arc welding machine 7 is fixed on walking
The top of vehicle 3.
Flux hopper is fixed using hose clamp by bearing diagonal on walking dolly.
Welding gun 6 is connect with flux hopper 5 by Thermostable flexible hose.
It further include welding recyclable device 9, positioned at the lower section of welding gun 6.
It further include control cabinet 10, one end of walking dolly 3 is arranged in control cabinet 10, and control cabinet 10 is located at vacuum cap type rail
The top in road 1.
The control cabinet 10 can be connect with control system, realize that sucked type vertically fixes the automatic of submerged-arc automatic welding device
Control.
The arrow in upper right side indicates welding machine direction of advance in Fig. 2.
Comparative example 1
Solder flux is fysed flux as different from Example 2.
When using fysed flux, since density is small, solder flux heap height is higher by 20%~50% than sintered flux.Gage of wire
Bigger welding current is higher, and solder flux thickness height also accordingly increases；Since the operation of welding process is lack of standardization, the disposition of fine powder solder flux does not conform to
Reason, face of weld will appear interrupted uneven pit, and non-destructive testing is qualified but presentation quality is affected, and locally weakens shell
Body thickness.
Comparative example 2
The solder flux tooling of submerged arc welding machine is changed to the solder flux tooling of manual electric arc welding as different from Example 2.
The thickness that vertical fixed submerged-arc welding need to only fill 9 can meet relevant welding inspection standard, and manual arc
Weldering needs 16 filling cover weldings, vertical fixed submerged arc welding speed 80cm/mi~90cm/mi, manual electric arc welding welding speed
Degree is 50cm/mi~60cm/mi.Submerged-arc welding wire is lost 3 meters or so, loses small, it can be achieved that continuous welding, reduction, which has been welded, to be connect
Head, welding efficiency is fast, and welder's operation is convenient, mitigates degree before labour, reduces cost of labor.Manual electric arc welding to technique require compared with
Height, such as an electrode can continuously weld 90mm~100mm, and welding point is more, and welding point is most thin in welding quality again
Weak link, the time of welding rod replacement and electric resistance of stainless increase greatly wlding consumption, realize that storage tank inversion hair welding is applied
Work, effect improve about 3~4 times compared with manual welding.From the loss of wlding, the skull after melting in welding process is not easily cleaned, and is shortened
Cleaning work to layer.
Comparative example 3
Parameter welding current is 200A, weldingvoltage 30V as different from Example 2.In welding process, welding wire and weldering
Agent dissolve after under the high temperature action in molten bath, since welding parameter matches improper, poor air permeability, the gas in molten bath is following
And overflow, bubble is formed in weld seam, is influenced to remain in metal inside formation stomata by metallic crystal.Solder flux covers molten bath
Lid thickness low LCL generates open arc.The granularity of bond flux selects suitable welding parameter, using it is preceding according to relevant standard into
Row baking, old solder flux and new solder flux to recycling stir use by a certain percentage, reduce stomata and generate.
The welding of selection in to(for) welding current is more stringent, and because stainless steel thermal conductivity is slow, liquid state molten pool metal is dilute, flowing
Performance is good, is influenced to be easy tenesmus by gravity, is difficult to control.Welding current is directly proportional to weldingvoltage, welding current mistake
The small removability of slag is deteriorated, and welding efficiency reduces, but be easy to cause interlayer and sidewall fusion bad, weld metal discontinuity, electric arc
Combustion instability.
Comparative example 4
Welding current 215A as different from Example 2, weldingvoltage 30.5V.
Vertical Lincoln weld welding parameter selection is improper, and between groove and filling metal or welding bead is without sufficiently molten
It is combined, in first layer hot weld since gap is small, welding current and weldingvoltage are mismatched, the hot accumulation in molten bath does not obtain
Enough to fusion penetration, when welding tube wall upward slope mouth side, angle is too deep, be not achieved after wire melting bottom etc. generate it is unmelted
It closes.
In vertical fixed submerged-arc welding application, especially by the system of the characteristics of stainless steel storage tank welding material and welding position
About, liquid metal is again not easy to control under solder flux, is easy tenesmus and generates overlap, undercut, weld seam two sides Jia Gou, is uneven etc. and to ask
Topic, it is desirable that manipulator's strict implement welding technique and measure is familiar with grasping operation skill, carries out every procedure, guarantees that welding is applied
Working medium amount.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Claims (10)
1. a kind of sucked type vertically fixes submerged-arc welding welding in storage tank method, it is characterised in that: specific steps are as follows:
Storage tank top siding opens up circumferential weld groove；First bevel is cleared up again；
It is cleared up before weldering by groove and nearby；
Vacuum cap type track is fixed on to the top of circumferential weld groove in tank wall, vacuum cap type track is parallel with circumferential weld, row
It walks trolley to be mounted on vacuum cap type track, submerged arc welding machine is fixed on walking dolly, and the branch of welding wire is loaded on submerged arc welding machine
Welding wire, flux hopper are respectively fixed in support two sides, and the welding gun of submerged arc welding machine is fixed on walking dolly, submerged arc welding machine welding gun
Muzzle be directed at weld seam, walking dolly moves along track and welds around siding to storage tank；
During welding, old solder flux is added in welding machine funnel, mass percent >=50% of new solder flux, the matter of old solder flux
Measure percentage < 50%.
2. according to the method described in claim 1, it is characterized by: in welding process between road temperature be no more than 150 DEG C, welding
Shorten the residence time in 450~850 DEG C of temperature ranges in the process.
3. according to the method described in claim 1, it is characterized by: storage tank is austenitic stainless steel TP304 material, the wall of storage tank
Thickness is 8-60mm.
4. according to the method described in claim 1, the angle of groove is 45 it is characterized by: the groove of top siding is " K " type
± 2.5 °, lower part siding square groove；
Preferably, the lower groove indwelling 0.5mm-1mm of tube wall.
5. according to the method described in claim 1, it is characterized by: weldingvoltage is 30-33.5V.
6. according to the method described in claim 1, it is characterized by: welding current be 220-290A, welding current and voltage at
Direct ratio.
7. according to the method described in claim 1, it is characterized by: the stem elongation degree of welding wire is 10-15mm；
Preferably, the diameter of welding wire is 1.6mm or 2mm；
Preferably, welding wire is vertical with weld seam, and the angle of welding wire and tube wall is 85~90 °.
8. according to the method described in claim 1, it is characterized by: speed of welding is 80cm/mi~90cm/mi.
9. according to the method described in claim 1, it is characterized by: using multi-pass welding, welding flux layer with a thickness of 2~4mm,
Welding point mutually staggers 30-50mm.
10. a kind of sucked type vertically fixes submerged-arc automatic welding device, it is characterised in that: including vacuum cap type track, walking are small
Vehicle, wire reel, flux hopper, welding gun, welding machine, walking dolly are mounted on vacuum cap type track, and wire reel, flux hopper are solid
It is scheduled on one end of walking dolly, the opposite other end is fixedly connected with welding gun, and wire reel and welding gun are located at vacuum cap type rail
The two sides in road, welding gun are connect with welding machine, and welding machine is fixed on the top of walking dolly；
Preferably, welding gun is connect with flux hopper by Thermostable flexible hose；
It preferably, further include welding recyclable device, positioned at the lower section of welding gun；
It preferably, further include control cabinet, one end of walking dolly is arranged in control cabinet, and control cabinet is located at vacuum cap type track
Top.
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| CN101412136A (en) * | 2008-11-18 | 2009-04-22 | 上海市安装工程有限公司 | Welding process of large-sized liquefied natural gas storage tank |
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| KR20130077659A (en) * | 2011-12-29 | 2013-07-09 | 현대중공업 주식회사 | Welding apparatus |
| CN106425048A (en) * | 2016-11-10 | 2017-02-22 | 河北二十冶建设有限公司 | Soldering method and soldering device for storage tank flip method |
| CN106624284A (en) * | 2016-12-28 | 2017-05-10 | 山东大学 | Whole-set welding equipment for automatic vertical welding of 9%-Ni steel for LNG storage tank and working method thereof |
| CN108856992A (en) * | 2018-08-15 | 2018-11-23 | 招商局重工（江苏）有限公司 | A kind of high heat-input double wire hidden arc welding high-efficiency welding method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412136A (en) * | 2008-11-18 | 2009-04-22 | 上海市安装工程有限公司 | Welding process of large-sized liquefied natural gas storage tank |
| CN201783747U (en) * | 2010-07-16 | 2011-04-06 | 上海泰胜(东台)电力工程机械有限公司 | Soldering flux recovery device used for submerged arc welding |
| KR20130077659A (en) * | 2011-12-29 | 2013-07-09 | 현대중공업 주식회사 | Welding apparatus |
| CN106425048A (en) * | 2016-11-10 | 2017-02-22 | 河北二十冶建设有限公司 | Soldering method and soldering device for storage tank flip method |
| CN106624284A (en) * | 2016-12-28 | 2017-05-10 | 山东大学 | Whole-set welding equipment for automatic vertical welding of 9%-Ni steel for LNG storage tank and working method thereof |
| CN108856992A (en) * | 2018-08-15 | 2018-11-23 | 招商局重工（江苏）有限公司 | A kind of high heat-input double wire hidden arc welding high-efficiency welding method |
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