CN1464217A - Process for manufacturing steel sheet made butt-welded single seam pulling bend - Google Patents
Process for manufacturing steel sheet made butt-welded single seam pulling bend Download PDFInfo
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- CN1464217A CN1464217A CN 02121261 CN02121261A CN1464217A CN 1464217 A CN1464217 A CN 1464217A CN 02121261 CN02121261 CN 02121261 CN 02121261 A CN02121261 A CN 02121261A CN 1464217 A CN1464217 A CN 1464217A
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Abstract
The present invention belongs to the field of metal pipe manufacturing technology, and relates to the manufacture process of steel plate butt welding single-seam elbow. The manufacture process includes the technological steps of cutting steel plate, winding, welding, pushing to form, finishing, surface treatment and others. During the mass manufacture, no mechanical allowance is needed and the MF current and voltage are controlled properly to raise product quality, reduce loss, lower pollution and raise production efficiency.
Description
Technical field
The invention belongs to metal pipe element and make the field, relate to a kind of manufacture method of steel plate system butt welding single seam pulling system elbow.
Background technique
Traditional steel plate system elbow is generally butt welding double slit punched bend, and its production technology comprises a blanking: adopt the blanking of directly ruling of model measurer, each elbow housing needs following two steel plate blank sheets, and the type shape is fan-shaped, consults shown in Figure 1; B compacting:, generally need in oven, heat three times corresponding compacting cube energy compression moulding on press machine with the compression moulding of steel plate blank sheet; C assembling: need assembling, gas cutting machine shaping repeatedly, on the elbow housing, leave twice weld seam, the groove of grinding longitudinal seam repeatedly behind the welding fabrication; D groove integer: in the integer process, directly firmly hit steel plate, also need heat back round mouth on press machine when adjusting counterfeiting an emperor's order pipe fitting body diameter with sledgehammer.This butt welding double slit punched bend need give and stay amount of finish, materials are many, weld seam is many, and working life is short, the fabricating cost height, and the manufacture method of steel plate system butt welding double slit punched bend, exist technology and fall behind, time-consuming, effort, waste coal resource, befouling environment in a large number, can not form deficiencies such as production in enormous quantities, wayward quality of product.
Deficiency at traditional steel plate system butt welding double slit punched bend existence, I have applied for that application number is 002235690.8 utility model patent, proposed a kind of steel plate system butt welding single seam pulling system elbow, consulted shown in Figure 2ly, its structure is to have only weld seam 2 on the elbow housing 1 one, this butt welding single seam pulling system elbow does not need to reserve amount of finish, materials are few, save material about 20% than butt welding double slit punched bend, and weld seam is few, long service life, fabricating cost can reduce about 30%.
Summary of the invention
The objective of the invention is to solve above-mentioned the problems of the prior art and a kind of technology advanced person is provided, save time, laborsaving, the manufacture method of the steel plate system butt welding single seam pulling system elbow that fabricating cost is low.
The technical solution used in the present invention: a kind of manufacture method of steel plate system butt welding single seam pulling system elbow, comprise and buy, check and accept raw material, blanking, welding, moulding, integer, process of surface treatment step, its single seam pulling system elbow is provided with pipe crimping → welding → pushing molding procedure after the blanking operation.Its single seam pulling system elbow is provided with outward appearance detection, X ray non-destructive inspection operation behind welding process.Its single seam pulling system elbow blanking type shape is the square type, and the blanking width: the thickness that the diameter of pipe deducts steel plate multiply by 3.14; Cutting length: elbow curvature R multiply by 3.14 and multiply by the elbow external diameter divided by 2 and add 3 times of wall thickness divided by tube outer diameter.Its single seam pulling system elbow welds bottoming by hand with the steel pipe of roll-forming in welding process, with twice moulding of weldering welding automatically; During the welding first pass: electric current is 350-450A, and arc voltage is 20-25V, and welding speed is 550-650mm/ minute; When welding second time: electric current is 550-600A, and arc voltage is 35-40V, and welding speed is 690-750mm/ minute.Its single seam pulling system elbow is in the pushing molding procedure, and voltage of intermediate frequency is 360-450V, when heating-up temperature is 800-950 ℃, start the pushing machine hydraulic system, beginning picks work normally, and picking electric current is 150-600A, the speed of picking is 9-25cm/ minute, and pushing pressure is 5-12Mpa.Its single seam pulling system elbow is in the integer operation, and the semi-finished product elbow that pushing is qualified is put on the mold, starts the 500T press machine and once suppresses success.
The present invention only need descend a slice steel plate blank sheet, do not need to reserve amount of finish, in the pushing process, only need electric current, the voltage of suitable control intermediate frequency, just can produce and control quality of product in enormous quantities, help reducing the wasting of resources and environmental pollution, greatly improve manufacturing efficiency, saved cost of labor, technology advanced person of the present invention, save time, laborsaving, fabricating cost is low.
Description of drawings
Fig. 1 is conventional steel plates system butt welding double slit punched bend blanking type shape schematic representation;
Fig. 2 is steel plate system butt welding single seam pulling system elbow structure schematic representation of the present invention;
Fig. 3 is the manufacturing process flow diagram of steel plate system butt welding single seam pulling system elbow of the present invention;
Fig. 4 is a blanking type shape schematic representation of the present invention;
Fig. 5 is a pipe crimping type shape schematic representation of the present invention;
Fig. 6 is the manual multilayer welding of the present invention schematic representation;
Fig. 7 welds the single groove schematic representation automatically for the present invention;
Fig. 8 welds the double groove schematic representation automatically for the present invention;
Fig. 9 is one of welding line joint shape defect of the present invention schematic representation;
Figure 10 is two schematic representation of welding line joint shape defect of the present invention;
Figure 11 is three schematic representation of welding line joint shape defect of the present invention;
Figure 12 welds one of hipped end mouth structure pattern schematic representation for the present invention;
Figure 13 welds two schematic representation of hipped end mouth structure pattern for the present invention.
Embodiment
Consult shown in Figure 3, a kind of manufacture method of steel plate system butt welding single seam pulling system elbow, mainly comprise and buy, check and accept raw material → blanking → pipe crimping → manual welding or process steps such as welding → outward appearance detection → X ray non-destructive inspection automatically → pushing moulding → integer → non-destructive inspection → groove processing → surface treatment, packing, wherein
A. buy, check and accept raw material technology rules:
1. the raw material to welding of elbow are steel plate, and its common used material trade mark is: Q235A, Q235B, 20#, 20R, 16Mn, 16MnR;
2. make and all need have the Certificate Of Conformance book (or other manifolies) of production steel mill to the raw material of welding of elbow, and should carry out an acceptance inspection to steel according to certificate, necessary fashion should be reviewed, and confirms can use after qualified;
3. according to customer requirements, can increase Interventions Requested,, but need consult, and in contract, indicate through both sides of supply and demand as ultrasonic, infiltration, magnetic particle flaw detection or other Interventions Requested to material;
4. welding consumables should meet GB/T5117-95 carbon steel and GB/T5118-95 low-alloy welding rod standard.
B. technology for blanking rules:
Consult shown in Figure 4,
1. directly adopt the gage measurings blankings of ruling according to the kind specification of elbow different;
2. when directly ruling with gage measuring, the machining allowance of welding contracted quantity and weld groove with due regard to is to guarantee to weld the correct of back pipe size;
3. after the steel plate line,, after the blanking molten slag is removed clean with the direct blanking of automatic oxygen cutting flame machine.
Illustrate:
The thickness of steel plate is 8～20mm, and blanking type shape is the square type;
The blanking width: the thickness that the diameter of pipe deducts steel plate multiply by 3.14;
Cutting length: elbow curvature R multiply by 3.14 and multiply by the elbow external diameter divided by 2 and add 3 times of wall thickness divided by tube outer diameter.
C. pipe rolling technique rules:
Consult shown in Figure 5ly, down good steel plate material is placed on the plate bending rolls scrolling 4～7 times, until being rolled into pipe;
Technical requirements: (1) ovality: pipe end ovality: maximum ≯ D+1%*D
Minimum ≮ D-1%*D
Pipe shaft ovality: maximum ≯ D+3%*D
Minimum ≮ D-3%*D
(2) weld can not mismatch, and the end is smooth smooth.
D. welding procedure rules:
The pipe material that rolls adopts manual welding respectively and welds the dual mode welding fabrication automatically;
A) manual welding technology
1. prepare before the weldering and the welding environment
1) storage of welding rod, solder flux and other welding consumabless should be kept dry, and relative moisture must not be greater than 60%;
2) following arbitrary situation occurs when the welding environment, and when not having effective protective measures, forbid welding;
Wind speed is greater than 10m/s during manual welding;
Relative moisture is greater than 90%;
The sleet environment
When weldering body temperature degree is lower than 0 ℃, should in welding place 100mm scope, be preheating to about 15 ℃;
2. welding position
Be chosen in the flat position of welding welding, the elbow body is placed on the rotational fixation frame, molten drop can fall into the molten bath by gravity, gas, the easy emersion of slag surface in the molten bath, therefore available at ordinary times big electric current welding, the manufacturing efficiency height, weld seam forms, welding quality guarantees easily, so generally should weld in the flat position of welding as far as possible;
3. bevel for welding should keep smooth, and defectives such as crackle, layering, slag inclusion must not be arranged, and groove face and both sides (each 20mm of manual metal-arc welding) should clean out water, iron rust, greasy dirt, accumulated slag and other objectionable impurities;
4. when selecting welding machine for use, at first according to welding rod coating (coating) type selecting welding machine kind.Low hydrogen sodium electrode must be selected DC arc welding machine for use, to guarantee the arc stability burning.Though the acid electrode AC/DC all can, generally select AC arc welding machine for use, during alternating current arc welding, the magnetic blow phenomenon is not obvious;
5. welding condition
1) core diameter: core diameter is generally selected according to pipe fitting thickness;
The first layer of groove opening multi-layer welding and the welding of non-flat position of welding should be adopted less core diameter;
2) welding current:
Welding current is the main technologic parameters of manual metal-arc welding;
When welding current was too big, the welding rod afterbody was rubescent, and partial coating will lose efficacy or avalanche, and the mechanical protection weak effect can cause pore; Can cause undercut in addition, defective such as burn, also can make joint zone of influence crystal grain thick, the ductility of welded joint descends;
Welding current too hour can cause defectives such as lack of penetration, incomplete fusion, pore and slag inclusion, and manufacturing efficiency is low;
Therefore, select welding current, at first should guarantee welding quality, secondly should adopt bigger electric current as far as possible, to improve labor productivity;
Welding current generally can carry out initial option according to core diameter, for important structure welding current scope (input is determined according to heat) according to the rules, determine welding current (being applicable to carbon steel and low alloy steel) with reference to the welding current of following table and the relation of core diameter, in addition, also to further consider thickness of slab, joint form, welding ambient temperature, factors such as elbow material and welding rod.
| Core diameter mm | ?1.6 | ?2.0 | ?2.5 | ?3.2 | ?4 | ?5 | ??6 |
| Welding current A | ?25-40 | ?40-65 | ?50-80 | ?100-130 | ?160-210 | ?200-270 | ??260-300 |
Consult shown in Figure 6ly, the welding of slab is generally wanted groove opening and is adopted multi-layer welding, and the microstructure of multi-layer welding weld seam is thinner, and the heat affected zone is narrow, and the ductility of joint and toughness are all relatively good.
B. the welding procedure of Lincoln weld
1. prepare before the weldering and the welding environment
1) with in the manual welding technology 1 1) with 2) regulation identical;
2) welding wire will clean, totally;
2. the steel pipe that rolls shaping is welded bottoming by hand, with twice moulding of weldering welding automatically;
3. two starting weld tabs of burn-oning at the weld seam two ends are to guarantee striking and to receive the welding quality at arc place;
4. welding position: steel pipe is fixed on the weld holder, then weld seam be transferred to steel pipe directly over;
5. regulation bevel for welding: with in the manual welding technology 3) is identical;
6. debugging automatic welding machine: do one will with the identical sample of object specifications and models of welding, automatic welding machine is welded preceding debugging, at the pipe material of different size electric current, voltage etc. is adjusted;
When 1) welding first pass: electric current is between 350-450A, and arc voltage is between 20-25V, and welding speed is 550-650mm/ minute;
When 2) welding second time: electric current is between 550-600A, and arc voltage is between 35-40V, and welding speed is 690-750mm/ minute;
7. the good solder flux (temperature of putting adjusting into was dried 1 hour at least) of oven dry is in advance put into the solder flux bucket, first-class welding wire in 200-300 ℃ dryer;
Support (promptly automatically welding welded rails) be placed on weld seam directly over, put welding machine well, and, mix up the distance (about 3-4cm) of welding head and weld seam then support, welding head and weld seam straightening;
9. open the solder flux bucket, press power switch, according to debugging good electric current, voltage starting the arc on starting weld tab, welding;
10. after welding finishes, wait 2-3 minute and take off solder flux again, be not affected with the welding quality of guaranteeing weld seam;
11. knock out the starting weld tab at weld seam two ends, and the steel of two ends and weld seam thorn, accumulated slag etc. cleaned out.
C. welding requirements
1) tack weld must not have crackle, rewelds otherwise must remove; As also should remove when having pore, slag inclusion; Arc should be convenient to connect in the tack weld two ends of fusing in the permanent weld seam, otherwise should give finishing;
2) welding by both sides need be cleared up root of weld, manifests the weld metal of positive bottoming; Meet the arc place and should guarantee through welding and fusion;
Should control the scope that interpass temperature is no more than regulation in the welding process; When the weldment preheating, interpass temperature should be controlled and preheating temperature must not be lower than;
3) when welding should striking in starting weld tab or groove, forbids that in the striking of non-welding part the arc crater at arc scratch place needs through polishing, make its even transition to the mother metal surface, if the mother metal thickness after the polishing during less than specified value, then needs repair welding;
4) every weld seam should as far as possible once weld;
5) geomery of face of weld and appearance requirement:
Consult Fig. 7, shown in Figure 8, the reinforcement e of single groove, the welding of double groove two class joints
1, e
2Press the regulation (GB150-1998) in the table:
| Steel and the Cr-Mo low alloy steel steel of standard tensile strength lower limit δ b＞540Mpa | Other steel | ||||||
| Single groove | Double groove | Single groove | Double groove | ||||
| E 1 | e 2 | e 1 | e 2 | e 1 | e 2 | e 1 | e 2 |
| 0-10％ δ 2≤3 | ≤1.5 | 0-10％δ 1And≤3 | 0-10％δ 2And≤3 | 0-15％δ 2And≤4 | ≤1.5 | 0-15％δ 1And≤4 | 0-15％δ 2And≤4 |
D. weld seam is reprocessed
1) defective that welding is reprocessed to needs should be analyzed and reprocess reason, proposes corrective measure, carries out welding procedure qualification by standard, and technology is reprocessed in the establishment welding;
2) the same position of welding number of rewelding should not be above 2 times;
3) reprocess preceding the need defective is removed totally, can adopt surface inspection check affirmation in case of necessity;
4) position to be welded should open width evenly, surfacing, the groove of being convenient to weld, and there is certain gradient at two ends;
5) as the need preheating, preheating temperature should suitably improve by more former weld seam;
6) reprocessing Weld Performance should be identical with former weld seam with quality requirement.
E. welding quality and welding inspection technology rules:
(1) welding quality:
Welding quality generally comprises three aspects: weld appearance size, joint continuity and joint performance;
1) geomery of weld seam
Should seamlessly transit between weld seam and the mother metal, reduce stress and concentrate;
Consult Fig. 9, Figure 10, shown in Figure 11, the face shaping defective of welding line joint mainly contains undercut, overlap, burns, incompletely filling and misalignment etc.;
The undercut degree of depth of face of weld must not be greater than 0.5mm, and continuous length must not be greater than 100mm, the length overall of weld seam both sides undercut must not surpass 10% of this fusion length/;
2) continuity of welding line joint
The successional weld defects of destruction joint that joint should not be above standard and allow comprises crackle, pore and shrinkage cavity, incomplete fusion and lack of penetration etc.;
Weld defects can cause stress to be concentrated, and reduces bearing capacity, reduction of service life, even to cause brittle failure, brittle failure be that weld defects from joint begins.The general technology regulation: crackle, incomplete fusion and surperficial slag inclusion etc. are unallowed, pore, and lack of penetration, interior defective such as all slag inclusion and undercut etc. can not surpass certain permitted value.
(2) welding inspection:
The method of inspection that adopts is line nondestructive inspection as appearance test in the nondestructive examination and the X, and the inside and outside defective of butt welded seam is tested.
(3) technology of seam inspection:
What adopt is the plate rolling tube butt weld defects detecting technology that the photograph of JB4730-94 standard A B level requires establishment, and butt welded seam carries out 100% transillumination and detects, and commenting the qualified rank of sheet is secondary;
1) test specimen inspection and cleaning: if any hindering ray to penetrate or hinder the addition of paster, as equipment appurtenance, thermal insulating material etc. should be removed as far as possible on the test specimen; The test specimen surface quality should be qualified through visual examination, may produce when covering defective in the weld seam visual the finishing of polishing of reply surface on egative film as the surface imperfection state;
2) the transillumination mode of Xuan Zeing: double-walled list shadow carries out transillumination;
3) resembling matter meter and mark puts: line style resembles the matter meter and is placed on the workpiece surface of film side, and an end (1/4 place of the tested length) steel wire that is positioned at the detected weld district is across weld seam and vertical with bead direction, and filament places the outside; Various font marks should be complete, should comprise centre mark, overlap joint mark, workpiece numbering, welding seam No, position numbering at least: when reprocessing transillumination, should add and reprocess mark R; To the weld seam transillumination that reinforcement polishes, should add the round dot or the arrow mark of indicating position while welding; The putting position of various marks should be apart from weld edge 5mm at least, and the position that wherein overlaps mark is placed on the film side;
4) paster: adopt reliable method (magnet, rope band etc.) that film (magazine) is fixed on the tested position, film (magazine) should fit tightly with workpiece surface, does not stay the gap as far as possible;
5) focusing: radiation source is placed in the appropriate location, makes the tested district center of bundle of rays centrally aligned, and make focal length about 500-600mm according to the pipe material of different size, a transillumination length is between 250-280mm; Film adopts the film of 8 * 30.5cm normalization normal size, and brand can be Li Weina, Tianjin III or Lekai, Baoding etc.;
6) exposure: after above step is finished, can according to the rules parameter and instrumentation rule expose (according to the pipe material of different size, transillumination voltage is between the 175-230 kilovolt, and the transillumination electric current is between 4-5mA, and the exposure time is about 3-5 minute);
7) develop a film: the film that exposure finishes is taken the darkroom, removes magazine, film ditch to good developing solution in, according to the difference of development situation, after development 4-7 minute, put ditch again into in the good fixing solution, just can take out to be placed on about about 12-20 minute and wash in the clear water, it is cool good to take out.
8) comment sheet: press the JB4730-94 standard, quality of weld joint divides level Four, and the acceptable quality level rank is a secondary; Flawless, incomplete fusion, lack of penetration and strip slag inclusion allow indivedual pores and point-like slag inclusion in the first-order weld; Second-order weld planted agent flawless, incomplete fusion and lack of penetration allow a small amount of pore and slag inclusion.
F. weld qualified steel pipe pushing moulding process rules:
1. at first by the intermediate frequency operator who picks the workshop, electric equipment is carried out detailed inspection: whether scrutiny inverter bridge main circuit connection and each nut, components and parts dress weld firm; Check that each road cooling water is whether unimpeded and leak, regulate or check that water-pressure relay makes it at 0.5kg/cm
2In time, move, and notices that hydraulic pressure value should be greater than 1kg/cm
2Check the inversion plate, check be inserted on the assigned position and contact good, start-up board QD also will insert, check " Converting terminal row " whether be connected on the work gear put (right side in the middle of the intermediate frequency screen) normal by checking the affirmation equipment state;
2. be ready to instruments such as sledgehammer to take emergency measures;
3. by the plant operations worker accept section that last process welds is checked mutually with specification, model, quantity on producing advice note, confirm errorless after, shift material onto the pushing machine afterbody with go-cart, pile up neat, the operator is coated in the plumbago of dilute with water on the inwall of material section more equably, needs to guarantee to produce;
4. the plant operations worker hangs the plug of required specification on pushing machine, fixes the position, by the pushing machine afterbody section of expecting is put on one by one again, and is more than full of well, adjusts the gap of core print and inductor then, according to the difference of specification, with different adjusting method;
5. the intermediate frequency operator checks medium-frequency power, voltage whether normal (between the 360-450V), confirms that normal back opens intermediate frequency, hears calling then for intermediate frequency starts successfully, and the operator adds high-power gradually, is increased to suitable power by the difference of specification;
6. operator check that the temperature of core print stops intermediate frequency when reaching between 800-900 ℃, adjust the gap of inductor and core print more again according to the requirement of proper functioning, plate before and after putting down after adjusting, by the operator seam between the material section is alignd, the intermediate frequency operator starts intermediate frequency once more, when being heated to 800-950 ℃, start the pushing machine hydraulic system, beginning picks work normally, difference according to specification, pick electric current between 150-600A, the speed of picking is between 9-25cm/ minute, and pushing pressure is between 5-12MPa;
7. when pushing first elbow, with model check and correction elbow inner arc, length, measure bore with steel tape and reach and produce in batches after qualified by the exclusive surveyor;
8. when reject occurring aborning, search reason by operator or full-time technician, after fixing a breakdown again follow procedure produce.
G. integer technology rules:
1. whether the mold of at first checking the compacting elbow is qualified, place under repair in case of necessity, and until qualified fully, the mold fixation is correct;
2. take safety measures, worn appliances for labor protection, the semi-finished product elbow that pushing is qualified is put on the mold, starts the 500T press machine and once suppresses success;
3. in the integer process, note the scale in the cleaning mold, to guarantee the integer quality.
H. non-destructive inspection technology rules:
Will carry out non-destructive inspection with X ray to the elbow weld seam position that pushing goes out, adopt sampling observation at random and emphasis detection to combine, elbow be taked 20% percentage of detection detect, the nondestructive inspection characterization processes is ditto described.
I. elbow welds hipped end opening processing process rules:
Consult Figure 12, shown in Figure 13, elbow weldering hipped end mouth structure pattern can be two kinds of processing patterns among the figure.
J. the process of surface treatment rules of elbow:
The inner and outer surface of elbow should carry out processing of rust removing, and the coating anticorrosive paint; As medium that the client purchases is inflammable, explosive pipeline elbow, and inner and outer surface then forbids applying any rust proof paint, and for example: the elbow inner and outer surface of oxygen channel then forbids applying various paint.
Acceptable product packing through above-mentioned process step is dispatched from the factory.
The used manufacturing mechanism of the present invention is prior art, and various device can be bought from following manufacturer:
| Sequence number | Device name | Manufacturer | |
| ????1 | Semi auto cutting machine | Tianjin, Tianjin salt gas cutting machine factory | |
| ????2 | Rolling machine | Jinan City rolling machine factory | |
| ????3 | Electric welding machine | East, Beijing rises the electric welder factory | |
| ????4 | Carbon arc air gouging | East, Beijing rises the electric welder factory | |
| ????5 | Automatic submerged-arc welding machine | Arc welding rectifier | Tianjin gas compressor factory |
| ????6 | Automaticwelding head | Shanghai Welding Machine Factory | |
| ????7 | The frequency conversion portable X-ray detection apparatus of drawing last breath | Dandong Ray Instrument Group Corp. | |
| ????8 | The medium-frequency power heating plant | Hebei province Mengcun Hui Nation Autonomy Country Liming Electronic Mechanism Factory | |
| ????9 | Pushing machine | Tianjin little liquid lathe manufactory | |
| ????10 | Universal press | The forging press factory, Tianjin | |
Claims (6)
1. the manufacture method of a steel plate system butt welding single seam pulling system elbow, comprise and buy, check and accept raw material, blanking, welding, moulding, integer, process of surface treatment step, it is characterized in that single seam pulling system elbow is provided with pipe crimping → welding → pushing molding procedure after the blanking operation.
2. the manufacture method of steel plate system butt welding single seam pulling system elbow according to claim 1 is characterized in that single seam pulling system elbow is provided with outward appearance detection, X ray non-destructive inspection operation behind welding process.
3. the manufacture method of steel plate system butt welding single seam pulling system elbow according to claim 1 is characterized in that single seam pulling system elbow blanking type shape is the square type, and the blanking width: the thickness that the diameter of pipe deducts steel plate multiply by 3.14; Cutting length: elbow curvature R multiply by 3.14 and multiply by the elbow external diameter divided by 2 and add 3 times of wall thickness divided by tube outer diameter.
4. the manufacture method of steel plate system butt welding single seam pulling system elbow according to claim 1 is characterized in that single seam pulling system elbow welds bottoming by hand with the steel pipe of roll-forming in welding process, with twice moulding of weldering welding automatically; During the welding first pass: electric current is 350-450A, and arc voltage is 20-25V, and welding speed is 550-650mm/ minute; When welding second time: electric current is 550-600A, and arc voltage is 35-40V, and welding speed is 690-750mm/ minute.
5, the manufacture method of steel plate system butt welding single seam pulling system elbow according to claim 1, it is characterized in that single seam pulling system elbow is in the pushing molding procedure, voltage of intermediate frequency is 360-450V, when heating-up temperature is 800-950 ℃, start the pushing machine hydraulic system, beginning picks work normally, and picking electric current is 150-600A, the speed of picking is 9-25cm/ minute, and pushing pressure is 5-12Mpa.
6. the manufacture method of steel plate system butt welding single seam pulling system elbow according to claim 1 is characterized in that single seam pulling system elbow in the integer operation, and the semi-finished product elbow that pushing is qualified is put on the mold, starts the 500T press machine and once suppresses success.
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| CN 02121261 CN1464217A (en) | 2002-06-12 | 2002-06-12 | Process for manufacturing steel sheet made butt-welded single seam pulling bend |
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| CN101774113A (en) * | 2010-02-28 | 2010-07-14 | 河北沧海管件集团有限公司 | Hot-pushing process for manufacturing large-caliber high-steel grade single-seam elbow |
| CN101791746A (en) * | 2010-03-29 | 2010-08-04 | 中冶实久建设有限公司 | Large high-temperature refractory steel pipeline welding process |
| CN102218642A (en) * | 2011-04-29 | 2011-10-19 | 深圳市建筑设计研究总院有限公司 | Manufacturing method of thick wall steel pipe with small radius-thickness ratio used for building structure |
| CN102679079A (en) * | 2012-04-20 | 2012-09-19 | 苏州制氧机有限责任公司 | Aluminum compressed elbow and machining process thereof |
| CN102886659A (en) * | 2012-11-06 | 2013-01-23 | 江苏华阳金属管件有限公司 | Manufacturing method of large-caliber magnesium alloy pipe fitting |
| CN102921808A (en) * | 2012-11-15 | 2013-02-13 | 江阴中南重工股份有限公司 | Inner arc sheet pressing die for steel plate elbows with symmetrical weld seams |
| CN103604014A (en) * | 2013-11-14 | 2014-02-26 | 上海沈达空调配件厂（普通合伙） | Reducing pipe fitting and manufacturing method thereof |
| CN106870860A (en) * | 2015-12-11 | 2017-06-20 | 齐克先 | A kind of new prefabricated direct-buried heat insulation elbow |
| CN105606048A (en) * | 2016-03-11 | 2016-05-25 | 安徽新生力生物科技有限公司 | Method of manufacturing hot-blast stove |
| CN111085819A (en) * | 2018-10-24 | 2020-05-01 | 中核核电运行管理有限公司 | Method for preparing neutron flux measuring tube power station on site |
| CN111085819B (en) * | 2018-10-24 | 2021-11-12 | 中核核电运行管理有限公司 | Method for preparing neutron flux measuring tube power station on site |
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