CN106903399A - The high strength pipe semiautomatic welding method of more than X80 grade of steels - Google Patents

The high strength pipe semiautomatic welding method of more than X80 grade of steels Download PDF

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Publication number
CN106903399A
CN106903399A CN201710158155.1A CN201710158155A CN106903399A CN 106903399 A CN106903399 A CN 106903399A CN 201710158155 A CN201710158155 A CN 201710158155A CN 106903399 A CN106903399 A CN 106903399A
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China
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welding
pipe
gas
pipeline
steels
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CN106903399B (en
Inventor
李益平
许玉东
蒲江涛
徐杨
伍召成
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China National Petroleum Corp
Xinjiang Petroleum Engineering Construction Co Ltd
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China National Petroleum Corp
Xinjiang Petroleum Engineering Construction Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/173Arc welding or cutting making use of shielding gas and of a consumable electrode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/0026Arc welding or cutting specially adapted for particular articles or work
    • B23K9/0052Welding of pipe panels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00Materials to be soldered, welded or cut
    • B23K2103/02Iron or ferrous alloys
    • B23K2103/04Steel or steel alloys

Abstract

The present invention relates to the welding technique field of long distance pipeline; it is a kind of high strength pipe semiautomatic welding method of more than X80 grade of steels; including the pretreatment of the welding mouth of pipe and pipeline welding operation; it is characterized in that pipeline welding operation carries out all-position welding using fusible solid welding wire, pulse current and gas metal-arc welding technology to pipeline, its welding condition is as follows:Using semi-automatic downward welding technology, welding current is between 130A to 170A, weldingvoltage is between 14V to 24V, speed of welding is between 15cm/min to 28cm/min, wire feed rate is between 300cm/min to 500cm/min.The present invention compensate for the blank without semiautomatic welding method of the high strength pipe of current more than X80 grade of steels, can effectively solve Full-automatic welding cost and environmental requirement is high, manual welding efficiency is low shortcoming, substantially increase operating efficiency, save construction cost;It is compared Full-automatic welding and can reduce the direct construction cost of more than half, compared to the weld interval that manual welding can reduce 2/3rds.

Description

The high strength pipe semiautomatic welding method of more than X80 grade of steels
Technical field
It is a kind of high strength pipe of more than X80 grade of steels half the present invention relates to the welding technique field of long distance pipeline Automatic soldering method.
Background technology
For lie waste Continental Area natural gas transportation, feasible method is then to use pipeline, pipeline as oil, A kind of economic, long distance delivery instrument safely, uninterruptedly of natural gas, it is then to improve natural to improve its discharge pressure and performance The key of the economy of gas.Although as the raising of pipe line steel rank, the unit price of steel pipe can also be improved, but average to natural The construction costs of the unit conveying capacity of gas will be greatly decreased, therefore, the conveyance conduit being made up of high-strength line-pipe steel is then urgent Demand.
For the welding of more than X80 grade of steels, the current country there is no the application practice of concrete engineering, and China's heavy caliber at present Long distance pipeline frequently with main flow welding procedure-STT root beads+semi-automatic flux cored arc welding(FCAW)Welding procedure Requirement can not be met.It is excessive that its main cause is welding current(Typically in more than 220A), cause weld heat input, heat input It is excessive, make the mechanical property of completion weld bond especially bend test performance extreme difference.
Year, the second west to east gas pipeline project major scientific and technological project(Second phase)The special topic six of problem seven has carried out the weldering of X100 high-strength line-pipe steels Construction technique research is connect, for 1016 steel pipes of Nippon Steel, by weldability test, welding material preferably, preliminarily forms 5 kinds Welding procedure, is molten electrode protected by gas automatic welding.But because steel pipe manufactory global at that time does not all manufacture on a large scale The ability of X100 high tensile steel tubes, therefore its welding procedure only rests on theory stage.
In three lines of transfering natural gas from the west to the east in 2013(West section)In the construction of the 3rd bid section, pipeline office has carried out 0.8 more than 200km The welding of ratio test section, the depot siding is all using the steel pipe material close to X90 steel.Through piping office Langfang Han Pei centers Multiple welding is tested, and the final welding procedure for determining the STT root beads+semi-automatic flux-cored wire of Chinese main flow at that time can not meet this The welding of Duan Guancai needs.Due to semi-automatic welding, it uses the mechanical property of all weld bonds of semi-automatic flux-cored wire welding equal Requirement can not be met.Finally, by test of many times, the depot siding is finally determined and all uses full automatic welding(GMAW)And craft Weldering(SMAW)Welding.According to final result, automatic welding AUT detections qualification rate is more satisfactory, but RT detections qualification rate is relatively low, by hand Not only RT detections qualification rate is relatively low for weldering welding, and efficiency of construction is extremely low.
In sum, at present for the pipeline of more than X80 grade of steels, feasible welding manner only has full-automatic and stick electrode Two kinds of weldering.However, due in the practice of construction of long distance pipeline, often existing, mountain region, level angle be more, cubic meter of stone section needs to be welded under ditch Situations such as connecing.In the case of such, if taking Full-automatic welding, due to the Full-automatic welding spy high to welding surroundings and space requirement Point, then must carry out developing finishing to welding setting, certainly will increase substantial amounts of earth and rock works, and cost influence is high.If taking Stick electrode is welded, then efficiency of construction is extremely low, is completely unsuitable for bigbore pipeline welding.
The content of the invention
The invention provides a kind of high strength pipe semiautomatic welding method of more than X80 grade of steels, overcome above-mentioned existing The deficiency of technology, the Full-automatic welding that it can effectively solve existing high strength pipe presence is high to welding surroundings and space requirement, Cost influence is high, and manual welding efficiency is low, and product qualified rate is low, is not suitable for the problem of large diameter pipeline welding.
The technical scheme is that realized by following measures:A kind of high strength pipe of more than X80 grade of steels half Automatic soldering method, including the pretreatment of the welding mouth of pipe and pipeline welding operation, it is characterised in that pipeline welding operation is using fusible Change solid welding wire, pulse current and gas metal-arc welding technology carries out all-position welding to pipeline, its welding condition It is as follows:Using semi-automatic downward welding technology, welding current is between 130A to 170A, and weldingvoltage is weldering between 14V to 24V Speed is connect between 15cm/min to 28cm/min, wire feed rate is between 300cm/min to 500cm/min, welding wire stretches out length Spend between 8 mm to 12mm, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.
Here is the further optimization and/or improvements to foregoing invention technical scheme:
Above-mentioned welding mouth of pipe pretreatment may include following steps:
1st, retaining wall on slope, retaining wall on slope is processed using mechanical means, and groove is the outside weld groove without inner liner, and slope type is Compound double V-groove, and finished edge end face is smooth, uniform, smooth;
2nd, the mouth of pipe cleaning, the mouth of pipe cleaning should using mechanical means will be cleared up in the range of the mouth of pipe surfaces externally and internally groove each 25mm in both sides to Metallic luster is presented, and soldered surface should be uniform, smooth, should not there is delamination, abrasion, iron rust, slag dirt, grease, paint and shadow Ring the other harmful substances matter of welding quality;
3rd, mouth of pipe group pair, mouth of pipe group correspondence is grouping using interior contra-aperture device, and interior contra-aperture device should not be in inner surface of pipeline Leave indentation, polishing scratch and greasy dirt;The two ends of pipeline should not be tapped in mouth of pipe group pair, mouth of pipe group answers unfitness of butt joint≤2.2mm, and Should be distributed along mouth of pipe even circumferential.
The design parameter of above-mentioned compound double V-groove can be:Upper bevel angle β is between 10 ° to 15 °, lower bevel angle α is Between 25 ° to 30 °, group is to gap between 1.5mm to 2.5mm, root face is between 0.8mm to 1.5mm, change groove flex point is away from pipe The distance of inwall is 7 ± 0.2mm, and thickness of pipe wall is 14.8mm.
Above-mentioned pipeline welding operation may include that step is as follows:
1st, checked before welding specially whether in place to check each rotary switches such as equipment, indicating meter, switch, electric power polarity, circuit Whether connect, whether gas transmission pipe joint tightens, whether welding gun connector loosens, whether ignition tip is tightened, commissioning device, it is ensured that weldering Connect circuit normal, check gas cylinder, each gas gauge and air inlet pipe, it is ensured that gas circuit is unimpeded and gas pressure stability;
2nd, weldering preceding pipeline groove preheating, will specially be managed using sensing heating or the method for electrical heating or flame heating before welding Road groove is preheated between 100 DEG C to 150 DEG C, preheating width with not less than being advisable in the range of each 50mm in tube groove both sides, and Ensure that preheating temperature is uniform;
3rd, the welding of root bead layer, the welding of hot weld layer, packed layer welding and capping layer welding are carried out successively, and should be protected in welding process Interlayer temperature is held between 80 DEG C to 150 DEG C, wherein, when interlayer temperature is higher than 150 DEG C, answer waiting temperature to be cooled to 150 DEG C Hereinafter, when interlayer temperature is less than 80 DEG C, the method heated using sensing heating or electrical heating or flame carries out heating to be made Temperature is higher than more than 80 DEG C.
The welding condition of above-mentioned root bead layer welding can be:Using semi-automatic downward welding technology, welding current is 140A To between 170A, weldingvoltage is between 14V to 18V, speed of welding is between 17cm/min to 28cm/min, wire feed rate is Between 300 cm/min to 500cm/min, electrode extension is between 8 mm to 12mm, the amplitude of oscillation is with weld metal deposition to weldering Road edge is defined.
The welding of above-mentioned hot weld layer, packed layer welding and the welding of capping layer can use identical welding condition, specifically such as Under:Using semi-automatic downward welding technology, welding current is between 130A to 160A, and weldingvoltage is welding between 17V to 24V Speed be 15cm/min to 25cm/min between, wire feed rate be 350 cm/min to 500cm/min between, electrode extension For between 8 mm to 12mm, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.
It is square-wave pulse arc welding equipment silk that above-mentioned pipeline welding operates adoptable welding equipment.
Protective gas in above-mentioned gas metal-arc welding technology can use mixed gas, the mixed gases matching by 80% argon gas and 20% carbon dioxide gas are constituted, and its gas purity is respectively:Argon gas >=99.99%, carbon dioxide gas >=99.95%, The L/min to 25L/min of output flow 18 of mixed gas.
The present invention compensate for the blank without semiautomatic welding method of the high strength pipe of current more than X80 grade of steels, can be with Effectively solution Full-automatic welding cost and the shortcoming that environmental requirement is high, manual welding efficiency is low, substantially increase operating efficiency, save About construction cost;It is compared Full-automatic welding and can reduce the direct construction cost of more than half, can be with compared to manual welding Reduce by 2/3rds weld interval.The semi-automatic welding of pipeline all-position, total wall thickness is realized using the present invention, is saved big The high acquisition expenses of Full-automatic welding equipment needed for the high-strength pipeline of bore.When being welded using the present invention, every layer of welding bead institute The weld metal amount of deposition is less than flux cored wire arc welding FCAW and manual electric arc welding SMAW, i.e., so-called " layer is thin, layer It is many ".But for welding bead, because rear road layer welding Shi Duiqian roads layer plays the role of similar heat treatment, therefore layer is thin right The mechanical property of weld bond is favourable.Using the present invention without welding slag, operating personnel can easily observe electric arc and molten bath Situation, so as to improve control.Simultaneously because without welding slag, every layer of interlayer cleaning work welded of weld seam greatly reduces, it is real Show that welding procedure is safe and clean, continuity is good, efficiency high purpose.
Brief description of the drawings
Accompanying drawing 1 in the present invention unilateral tube groove be the main view cross section structure diagram of compound double V-groove.
Accompanying drawing 2 is the cross section structure diagram of compound double V-groove of the tube groove group to being formed in the present invention.
Accompanying drawing 3 is the main view cross section structure diagram of the weld seam welding number of plies of inventive pipeline welding.
Coding in accompanying drawing is respectively:1 is root bead layer, and 2 is hot weld layer, and 3 is packed layer, and 4 is capping layer, and ɑ is lower groove Angle, β is upper bevel angle, and H is the height for becoming groove flex point away from inwall, and δ is thickness of pipe wall, and p is root face, and b is group to gap, h It is face of weld reinforcement, W is cap weld width.
Specific embodiment
The present invention is not limited by following embodiments, can technology according to the present invention scheme and actual conditions determine specifically Implementation method.
In the present invention, for the ease of description, the description of the relative position relation of each part is according to Figure of description 1 Butut mode be described, such as:The position relationship of forward and backward, upper and lower, left and right etc. is according to the Butut of Figure of description Direction determines.
With reference to embodiment and accompanying drawing, the invention will be further described:
As shown in accompanying drawing 1,2,3, the high strength pipe semiautomatic welding method of more than the X80 grade of steels includes welding mouth of pipe pretreatment Operated with pipeline welding, it is characterised in that pipeline welding operation is using fusible solid welding wire, pulse current and consumable electrode gas Protection welding technology carries out all-position welding to pipeline, and its welding condition is as follows:Using semi-automatic downward welding technology, welding electricity Flow between 130A to 170A, weldingvoltage is between 14V to 24V, speed of welding is between 15cm/min to 28cm/min, to send Silk speed is between 300cm/min to 500cm/min, electrode extension is between 8 mm to 12mm, the amplitude of oscillation is with weld metal Deposition is defined to welding bead edge.Thus total wall thickness, the all-position welding of long distance pipeline can be realized, in welding process, electric arc melts The molten bath and welding region of change welding wire and mother metal formation can effectively prevent week under the protection of inert gas or active gases Enclose the illeffects of surrounding air.Pipeline down hill welding is from pipeline upper top striking, the behaviour that all-position welding is carried out from top to bottom Make technology, the method speed of welding is fast, and weld seam forms attractive in appearance, and welding quality is good, can save welding material, reduce workman's work Intensity;Using semi-automatic downward welding technology, the welding efficiency that can both overcome manual welding to exist is low, product qualified rate is low, inapplicable In the problem of large diameter pipeline welding, the high to environment and space requirement of Full-automatic welding presence, needs can be also overcome to welding Setting carries out developing finishing, cost problem high, with welding efficiency it is high, product qualified rate is high, to environment and space requirement It is low, can be suitably used for large diameter pipeline welding under operating mode complex environment and the characteristics of low cost.
Can according to actual needs, the high strength pipe semiautomatic welding method to above-mentioned more than X80 grade of steels makees further excellent Change or/and improve:
As shown in accompanying drawing 1,2,3, welding mouth of pipe pretreatment comprises the following steps:
1st, retaining wall on slope, retaining wall on slope is processed using mechanical means, and groove is the outside weld groove without inner liner, and slope type is Compound double V-groove, and finished edge end face is smooth, uniform, smooth;
2nd, the mouth of pipe cleaning, the mouth of pipe cleaning should using mechanical means will be cleared up in the range of the mouth of pipe surfaces externally and internally groove each 25mm in both sides to Metallic luster is presented, and soldered surface should be uniform, smooth, should not there is delamination, abrasion, iron rust, slag dirt, grease, paint and shadow Ring the other harmful substances matter of welding quality;
3rd, mouth of pipe group pair, mouth of pipe group correspondence is grouping using interior contra-aperture device, and interior contra-aperture device should not be in inner surface of pipeline Leave indentation, polishing scratch and greasy dirt;The two ends of pipeline should not be tapped in mouth of pipe group pair, mouth of pipe group answers unfitness of butt joint≤2.2mm, and Should be distributed along mouth of pipe even circumferential.Thus can ensure that being smoothed out for follow-up welding process.
As shown in accompanying drawing 1,2,3, the design parameter of compound double V-groove is:Upper bevel angle β be 10 ° to 15 ° between, under Bevel angle α be 25 ° to 30 ° between, group to gap b be 1.5mm to 2.5mm between, root face p be 0.8mm to 1.5mm between, It is 7 ± 0.2mm apart from H to become groove flex point away from inside pipe wall, and thickness of pipe wall δ is 14.8mm.According to demand, pipeline can select X100 steel The pipe line steel of level, caliber is 1219 × 14.8mm of ¢, wherein upper bevel angle β and lower bevel angle α refers to one side angle.
As shown in accompanying drawing 1,2,3, pipeline welding operation includes that step is as follows:
1st, checked before welding specially whether in place to check each rotary switches such as equipment, indicating meter, switch, electric power polarity, circuit Whether connect, whether gas transmission pipe joint tightens, whether welding gun connector loosens, whether ignition tip is tightened, commissioning device, it is ensured that weldering Connect circuit normal, check gas cylinder, each gas gauge and air inlet pipe, it is ensured that gas circuit is unimpeded and gas pressure stability;
2nd, weldering preceding pipeline groove preheating, will specially be managed using sensing heating or the method for electrical heating or flame heating before welding Road groove is preheated between 100 DEG C to 150 DEG C, preheating width with not less than being advisable in the range of each 50mm in tube groove both sides, and Ensure that preheating temperature is uniform;
3rd, the welding of root bead layer 1, the welding of hot weld layer 2 are carried out successively, packed layer 3 is welded and capping layer 4 is welded, and in welding process Interlayer temperature should be kept between 80 DEG C to 150 DEG C, wherein, when interlayer temperature is higher than 150 DEG C, answer waiting temperature to be cooled to Less than 150 DEG C, when interlayer temperature is less than 80 DEG C, the method heated using sensing heating or electrical heating or flame is carried out at heating Reason makes temperature be higher than more than 80 DEG C.In concrete operations, when operating environment is poor, when temperature drop rate is fast, can be by tube groove Heat range be adjusted between 100 DEG C to 200 DEG C, so that it is guaranteed that the welding of root bead layer 1, the welding of hot weld layer 2, packed layer 3 welds And interlayer temperature during capping 4 welding of layer can be maintained between 80 DEG C to 150 DEG C.According to demand, the welding of root bead layer 1, hot weld layer 2 Welding, packed layer 3 are welded and thus the welding of capping layer 4 can be improved whole using continuous productive process without re-adjustments parameters The efficiency of construction of body engineering;In the welding process of packed layer 3, can be by 3 points of packed layer for five-layer structure is subjected to.
As shown in accompanying drawing 1,2,3, the welding condition of the welding of root bead layer 1 is:Using semi-automatic downward welding technology, welding Electric current be 140A to 170A between, weldingvoltage be 14V to 18V between, speed of welding be 17cm/min to 28cm/min between, Wire feed rate is between 300 cm/min to 500cm/min, electrode extension is between 8 mm to 12mm, the amplitude of oscillation is with weld seam gold Category deposition is defined to welding bead edge.
As shown in accompanying drawing 1,2,3, the welding of hot weld layer 2, packed layer 3 are welded and the welding of capping layer 4 uses identical Welder Skill parameter, it is specific as follows:Using semi-automatic downward welding technology, welding current is between 130A to 160A, weldingvoltage be 17V extremely Between 24V, speed of welding be 15cm/min to 25cm/min between, wire feed rate be 350 cm/min to 500cm/min between, Electrode extension is between 8 mm to 12mm, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.The welding of root bead layer 1, heat The welding condition table of comparisons that layer 2 is welded, packed layer 3 is welded and capping layer 4 is welded is as shown in appendix 1.
According to demand, the welding equipment that pipeline welding operation is used is square-wave pulse arc welding equipment silk.According to demand, weld Equipment can select the bear paddy MPS-500 sources of welding current and be matched with bear paddy XG-93 wire-feed motors, and welding wire selects Greensboro ER100S-G Φ The consumable electrode gas-arc solid welding wire of 1.2mm.
According to demand, the protective gas in gas metal-arc welding technology uses mixed gas, the mixed gases matching It is made up of 80% argon gas and 20% carbon dioxide gas, its gas purity is respectively:Argon gas >=99.99%, carbon dioxide gas >= 99.95%, the L/min to 25L/min of output flow 18 of mixed gas.
In the present invention:The percentage of gas is all percent by volume.
By taking the pipeline welding of X100 Grade Pipeline Steels as an example, its caliber is 1219 × 14.8mm of ¢, welding step to the present embodiment It is rapid as follows:
The first step, welding mouth of pipe pretreatment, specifically includes following steps:
1st, retaining wall on slope, retaining wall on slope is processed using mechanical means, and groove is the outside weld groove without inner liner, and slope type is Compound double V-groove, and finished edge end face is smooth, uniform, smooth;The design parameter of compound double V-groove is:Upper bevel angle β is between 10 ° to 15 °, lower bevel angle α is between 25 ° to 30 °, group is to gap b between 1.5mm to 2.5mm, root face p is Between 0.8mm to 1.5mm, it is 7 ± 0.2mm apart from H to become groove flex point away from inside pipe wall, and thickness of pipe wall δ is 14.8mm;
2nd, the mouth of pipe cleaning, the mouth of pipe cleaning should using mechanical means will be cleared up in the range of the mouth of pipe surfaces externally and internally groove each 25mm in both sides to Metallic luster is presented, and soldered surface should be uniform, smooth, should not there is delamination, abrasion, iron rust, slag dirt, grease, paint and shadow Ring the other harmful substances matter of welding quality;
3rd, mouth of pipe group pair, mouth of pipe group correspondence is grouping using interior contra-aperture device, and interior contra-aperture device should not be in inner surface of pipeline Leave indentation, polishing scratch and greasy dirt;The two ends of pipeline should not be tapped in mouth of pipe group pair, mouth of pipe group answers unfitness of butt joint≤2.2mm, and Should be distributed along mouth of pipe even circumferential.
Second step, pipeline welding operation includes that step is as follows:
1st, checked before welding specially whether in place to check each rotary switches such as equipment, indicating meter, switch, electric power polarity, circuit Whether connect, whether gas transmission pipe joint tightens, whether welding gun connector loosens, whether ignition tip is tightened, commissioning device, it is ensured that weldering Connect circuit normal, check gas cylinder, each gas gauge and air inlet pipe, it is ensured that gas circuit is unimpeded and gas pressure stability;
2nd, weldering preceding pipeline groove preheating, will specially be managed using sensing heating or the method for electrical heating or flame heating before welding Road groove is preheated between 100 DEG C to 150 DEG C, preheating width with not less than being advisable in the range of each 50mm in tube groove both sides, and Ensure that preheating temperature is uniform;
3rd, the welding of root bead layer 1, the welding of hot weld layer 2 are carried out successively, packed layer 3 is welded and capping layer 4 is welded, and in welding process Interlayer temperature should be kept between 80 DEG C to 150 DEG C, wherein, when interlayer temperature is higher than 150 DEG C, answer waiting temperature to be cooled to Less than 150 DEG C, when interlayer temperature is less than 80 DEG C, the method heated using sensing heating or electrical heating or flame is carried out at heating Reason makes temperature be higher than more than 80 DEG C;Welding equipment can select the bear paddy MPS-500 sources of welding current and be matched with bear paddy XG-93 wire-feed motors, Consumable electrode gas-arc solid welding wire of the welding wire from Greensboro ER100S-G Φ 1.2mm;In gas metal-arc welding technology Protective gas uses mixed gas, and the mixed gases matching is made up of 80% argon gas and 20% carbon dioxide gas, its gas purity point It is not:Argon gas >=99.99%, carbon dioxide gas >=99.95%, the L/min to 25L/min of output flow 18 of mixed gas;Its In, the welding condition of the welding of root bead layer 1 is:Using semi-automatic downward welding technology, welding current is between 140A to 170A, Weldingvoltage is between 14V to 18V, speed of welding is between 17cm/min to 28cm/min, wire feed rate is 300 cm/min To between 500cm/min, electrode extension is between 8 mm to 12mm, the amplitude of oscillation is to welding bead edge with weld metal deposition It is accurate;The welding of hot weld layer 2, packed layer 3 are welded and the welding of capping layer 4 uses identical welding condition, specific as follows:Using half Automatic downward welding technology, welding current is between 130A to 160A, weldingvoltage is between 17V to 24V, speed of welding is Between 15cm/min to 25cm/min, wire feed rate is between 350 cm/min to 500cm/min, electrode extension is 8 mm To between 12mm, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.The welding of root bead layer 1, the welding of hot weld layer 2, packed layer 3 are welded Connect the welding condition table of comparisons welded with capping layer 4 as shown in appendix 1.
Thus the welding operation of the pipeline to X100 Grade Pipeline Steels can be completed, according to closest at present after the completion of operation Standard Q/SY GJX 0210-2012《Transfer natural gas from the west to the east three spool road engineering circuit solder technology specifications》It is required that, the welding to pipeline Joint is tested, and its inspection project includes visual examination, RT detections and mechanical property test.
Inspection result shows:Weld appearance shapes uniformity, crackle does not occur on weld seam and its neighbouring surface, does not melt The defects such as conjunction, stomata, slag inclusion, depression;Cap weld width W than outer surface groove width per side increase 0.5mm~2.0mm it Between, between 0mm~2mm, undercut depth is between 0.2mm~0.5mm for unfitness of butt joint≤1/8 δ, face of weld reinforcement h;Outward appearance is examined Look into it is qualified after, carry out RT detections, meet《Transfer natural gas from the west to the east three line pipeline engineering Non-Destructive Testings》The requirement of ray standard;RT detections are closed After lattice, then mechanical property test is carried out, its tension test, the disconnected experiment of cutting hammer, bend test, low-temperature impact test, macroscopic view gold Phase, hardness test etc. meet the requirement of Q/SY GJX 0210-2012 standards and matching X100 steel strength of parent.
In sum, the high strength pipe flowing water weld job of more than X80 grade of steels is the composite can be widely applied to, its is beneficial Effect is as follows:
1st, the present invention compensate for the blank without semiautomatic welding method of the high strength pipe of current more than X80 grade of steels, Ke Yiyou The shortcoming that effect solves Full-automatic welding cost and environmental requirement is high, manual welding efficiency is low, substantially increases operating efficiency, saves Construction cost.It is compared Full-automatic welding and can reduce the direct construction cost of more than half, can subtract compared to manual welding Few 2/3rds weld interval.
, realize using the present invention semi-automatic welding of pipeline all-position, total wall thickness, save the high-strength pipeline institute of heavy caliber Need the high acquisition expenses of Full-automatic welding equipment.
, when being welded using the present invention, the weld metal amount of every layer of welding bead institute deposition is less than flux cored wire arc welding FCAW and manual electric arc welding SMAW, i.e., so-called " layer is thin, layer is more ".But for welding bead, when being welded due to rear road layer There is similar heat treatment to preceding road layer, therefore the mechanical property of the thin butt welding mouth of layer is favourable.
, using the present invention without welding slag, operating personnel can easily observe the situation in electric arc and molten bath, so as to improve control System.Simultaneously because without welding slag, every layer of interlayer cleaning work welded of weld seam greatly reduces, welding procedure peace is realized Entirely, clean, continuity is good, efficiency high purpose.
Above technical characteristic constitutes highly preferred embodiment of the present invention, and it has stronger adaptability and optimal implementation effect Really, can according to actual needs increase and decrease non-essential technical characteristic to meet the demand of different situations.

Claims (10)

1. a kind of pretreatment of high strength pipe semiautomatic welding method of more than X80 grade of steels, including welding mouth of pipe and pipeline welding Operation, it is characterised in that pipeline welding operation is using fusible solid welding wire, pulse current and gas metal-arc welding technology All-position welding is carried out to pipeline, its welding condition is as follows:Using semi-automatic downward welding technology, welding current be 130A extremely Between 170A, weldingvoltage is between 14V to 24V, speed of welding is between 15cm/min to 28cm/min, wire feed rate is Between 300cm/min to 500cm/min, electrode extension is between 8 mm to 12mm, the amplitude of oscillation is with weld metal deposition to weldering Road edge is defined.
2. the high strength pipe semiautomatic welding method of more than X80 grade of steels according to claim 1, it is characterised in that welding Mouth of pipe pretreatment comprises the following steps:
1st, retaining wall on slope, retaining wall on slope is processed using mechanical means, and groove is the outside weld groove without inner liner, and slope type is Compound double V-groove, and finished edge end face is smooth, uniform, smooth;
2nd, the mouth of pipe cleaning, the mouth of pipe cleaning should using mechanical means will be cleared up in the range of the mouth of pipe surfaces externally and internally groove each 25mm in both sides to Metallic luster is presented, and soldered surface should be uniform, smooth, should not there is delamination, abrasion, iron rust, slag dirt, grease, paint and shadow Ring the other harmful substances matter of welding quality;
3rd, mouth of pipe group pair, mouth of pipe group correspondence is grouping using interior contra-aperture device, and interior contra-aperture device should not be in inner surface of pipeline Leave indentation, polishing scratch and greasy dirt;The two ends of pipeline should not be tapped in mouth of pipe group pair, mouth of pipe group answers unfitness of butt joint≤2.2mm, and Should be distributed along mouth of pipe even circumferential.
3. the high strength pipe semiautomatic welding method of more than X80 grade of steels according to claim 2, it is characterised in that compound The design parameter of double V-groove is:Upper bevel angle β is between 10 ° to 15 °, lower bevel angle α is between 25 ° to 30 °, it is right to organize Gap is between 1.5mm to 2.5mm, root face be between 0.8mm to 1.5mm become distance of the groove flex point away from inside pipe wall into 7 ± 0.2mm, thickness of pipe wall is 14.8mm.
4. the high strength pipe semiautomatic welding method of more than the X80 grade of steels according to claim 1 or 2 or 3, its feature exists Include that step is as follows in pipeline welding operation:
1st, checked before welding specially whether in place to check each rotary switches such as equipment, indicating meter, switch, electric power polarity, circuit Whether connect, whether gas transmission pipe joint tightens, whether welding gun connector loosens, whether ignition tip is tightened, commissioning device, it is ensured that weldering Connect circuit normal, check gas cylinder, each gas gauge and air inlet pipe, it is ensured that gas circuit is unimpeded and gas pressure stability;
2nd, weldering preceding pipeline groove preheating, will specially be managed using sensing heating or the method for electrical heating or flame heating before welding Road groove is preheated between 100 DEG C to 150 DEG C, preheating width with not less than being advisable in the range of each 50mm in tube groove both sides, and Ensure that preheating temperature is uniform;
3rd, the welding of root bead layer, the welding of hot weld layer, packed layer welding and capping layer welding are carried out successively, and should be protected in welding process Interlayer temperature is held between 80 DEG C to 150 DEG C, wherein, when interlayer temperature is higher than 150 DEG C, answer waiting temperature to be cooled to 150 DEG C Hereinafter, when interlayer temperature is less than 80 DEG C, the method heated using sensing heating or electrical heating or flame carries out heating to be made Temperature is higher than more than 80 DEG C.
5. the high strength pipe semiautomatic welding method of more than X80 grade of steels according to claim 4, it is characterised in that root bead Layer welding welding condition be:Using semi-automatic downward welding technology, welding current is weldingvoltage between 140A to 170A For between 14V to 18V, speed of welding is between 17cm/min to 28cm/min, wire feed rate is 300 cm/min to 500cm/ Between min, electrode extension is between 8 mm to 12mm, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.
6. the high strength pipe semiautomatic welding method of more than X80 grade of steels according to claim 4, it is characterised in that hot weld Layer welding, packed layer welding and capping layer welding use identical welding condition, specific as follows:Using semi-automatic down hill welding Technique, welding current be 130A to 160A between, weldingvoltage be 17V to 24V between, speed of welding be 15cm/min extremely Between 25cm/min, wire feed rate be 350 cm/min to 500cm/min between, electrode extension be 8 mm to 12mm it Between, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.
7. the high strength pipe semiautomatic welding method of more than X80 grade of steels according to claim 5, it is characterised in that hot weld Layer welding, packed layer welding and capping layer welding use identical welding condition, specific as follows:Using semi-automatic down hill welding Technique, welding current be 130A to 160A between, weldingvoltage be 17V to 24V between, speed of welding be 15cm/min extremely Between 25cm/min, wire feed rate be 350 cm/min to 500cm/min between, electrode extension be 8 mm to 12mm it Between, the amplitude of oscillation is defined by weld metal deposition to welding bead edge.
8. the high strength pipe semiautomatic welding method of more than the X80 grade of steels according to claim 1 or 2 or 3, its feature exists The welding equipment used in pipeline welding operation is square-wave pulse arc welding equipment silk;
Or/and, the protective gas in gas metal-arc welding technology uses mixed gas, and the mixed gases matching is by 80% argon Gas and 20% carbon dioxide gas are constituted, and its gas purity is respectively:Argon gas >=99.99%, carbon dioxide gas >=99.95%, gaseous mixture The L/min to 25L/min of output flow 18 of body.
9. the high strength pipe semiautomatic welding method of more than X80 grade of steels according to claim 4, it is characterised in that pipeline The welding equipment that welding operation is used is square-wave pulse arc welding equipment silk;
Or/and, the protective gas in gas metal-arc welding technology uses mixed gas, and the mixed gases matching is by 80% argon Gas and 20% carbon dioxide gas are constituted, and its gas purity is respectively:Argon gas >=99.99%, carbon dioxide gas >=99.95%, gaseous mixture The L/min to 25L/min of output flow 18 of body.
10. the high strength pipe semiautomatic welding method of more than the X80 grade of steels according to claim 5 or 6 or 7, its feature It is that the welding equipment that pipeline welding operation is used is square-wave pulse arc welding equipment silk;
Or/and, the protective gas in gas metal-arc welding technology uses mixed gas, and the mixed gases matching is by 80% argon Gas and 20% carbon dioxide gas are constituted, and its gas purity is respectively:Argon gas >=99.99%, carbon dioxide gas >=99.95%, gaseous mixture The L/min to 25L/min of output flow 18 of body.
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