CN106180991A - A kind of nuclear power station built-in fitting buried arc stud welding welding method - Google Patents

A kind of nuclear power station built-in fitting buried arc stud welding welding method Download PDF

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Publication number
CN106180991A
CN106180991A CN201610707879.2A CN201610707879A CN106180991A CN 106180991 A CN106180991 A CN 106180991A CN 201610707879 A CN201610707879 A CN 201610707879A CN 106180991 A CN106180991 A CN 106180991A
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China
Prior art keywords
welding
reinforcing bar
fitting
built
nuclear power
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CN201610707879.2A
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Chinese (zh)
Inventor
别刚刚
许红梅
王暖暖
许开勋
马少欣
江杰
朱姝姝
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China Nuclear Industry Huaxing Construction Co Ltd
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China Nuclear Industry Huaxing Construction Co Ltd
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Priority to CN201610707879.2A priority Critical patent/CN106180991A/en
Publication of CN106180991A publication Critical patent/CN106180991A/en
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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
    • B23K9/20—Stud welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/362—Selection of compositions of fluxes
    • 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
    • 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
    • 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
    • B23K9/24—Features related to electrodes
    • B23K9/28—Supporting devices for electrodes
    • B23K9/287—Supporting devices for electrode holders
    • 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
    • B23K9/32—Accessories

Abstract

The present invention relates to a kind of welding method, particularly relate to a kind of nuclear power station built-in fitting buried arc stud welding welding method, belong to nuclear power generating equipment technical field.The present invention uses rational welding procedure to weld, with coupling solder flux, the built-in fitting that bar diameter is 16～32mm, built-in fitting steel plate is ordinary carbon steel or low-alloy steel, welding condition is: weld interval: 4～12s, reinforcing bar extension elongation 7～13mm, reinforcing bar hoisting depth 6～12mm, current polarity is DC reverse connection, and size of current is 800～1700A；Flux constituent (percentage by weight) is: SiO2+TiO2: 25～35%, MnO+Al2O3: 25～35%, CaO+MgO:20～30%, CaF2+ FeO:5～15%, S≤0.03%, P≤0.04%.The present invention solves slag inclusion and the problem of arc blow present in conventional buried arc stud welding so that built-in fitting welding efficiency reaches about 5 times of traditional-handwork weldering, and welding quality is excellent, saves substantial amounts of labour cost.

Description

A kind of nuclear power station built-in fitting buried arc stud welding welding method
Technical field
The present invention relates to a kind of welding method, particularly relate to a kind of nuclear power station built-in fitting buried arc stud welding welding method, belong to In nuclear power generating equipment technical field.
Background technology
Nuclear power station built-in fitting is as the component being embedded in concrete, for a large amount of pipeline, equipment, supports etc. in nuclear island factory building The connection providing important supports, it is achieved the function that structural elements is firmly connected with foundation of civil work.Built-in fitting mainly by steel plate and The anchoring piece composition being welded thereon, built-in fitting mainly has built-in fitting and the band anchor of two kinds of versions, respectively band anchor studs Gu the built-in fitting of reinforcing bar.Built-in fitting welding traditional welding method is mainly the welding of Manual electric welding bar with CO 2 gas-shielded Weldering, but these welding methods exist, and following some is not enough: 1) welding efficiency is relatively low；2) welding first-time qualification rate is relatively low；3) weld seam Surface quality is the best, and between welding bead, transition is unsmooth；4) when welding many reinforcing bars on a block plate, owing to heat input causes more greatly Steel plate is yielding, needs correction.Buried arc stud welding, as a kind of novel built-in fitting welding method, welds at nuclear power station built-in fitting In there is no application.Standard JBJ 18-2012 " reinforcement welding control of acceptance " recommends built-in fitting buried arc stud welding welding procedure, But the built-in fitting welding that this welding procedure is only applicable in general industry and civil buildings, easily produces inside weld seam during welding The problem such as slag inclusion and arc blow, and nuclear power station built-in fitting welding quality requires very strict, the thing being connected with built-in fitting with guarantee Part is safe and reliable.
Summary of the invention
It is an object of the invention to the defect existed for prior art, propose a kind of nuclear power station built-in fitting buried arc stud welding weldering Connect method, improve welding efficiency and the solder yield of nuclear power station built-in fitting.
The present invention solves technical problem by the following technical programs: a kind of nuclear power station built-in fitting buried arc stud welding welding side Method, comprises the following steps:
Step one, rust cleaning of being polished position to be welded for built-in fitting surface of steel plate, polishing region is the circle of diameter >=80mm Built-in fitting reinforcing bar two ends are carried out polishing rust cleaning by territory, polishing length all >=20mm；
Step 2, grip reinforcing bar with welding gun, utilize reinforcing bar arrangement for adjusting height adjust the extension elongation of reinforcing bar and carry Rise；
Step 3, the reinforcing bar of step 2 is inserted in welding flux box and vertical top is pressed on built-in fitting steel plate；
The solder flux that step 4, injection have been dried；
Step 5, the welding parameter of regulation welding machine, weld interval: 4～12s, current polarity is DC reverse connection, size of current It is 800～1700A；
Step 6, employing welding machine weld；
Step 7, welded after strike slag.
The built-in fitting steel plate of the described step one of said method is ordinary carbon steel or low-alloy steel, and described built-in fitting reinforcing bar is straight Footpath is 16～32mm.
Described step 2 regulates reinforcing bar extension elongation 7～13mm, reinforcing bar hoisting depth 6～12mm.Reinforcing bar altitude mixture control Device includes external damper box and the adjusting slider being assemblied on welding gun, and the height of described damper box is more than the height of welding flux box Degree, this height difference is equal with the reinforcing bar extension elongation value required in welding condition；Described adjusting slider is mutual by a pair The slide block slided and the rotary handle composition being used for limiting slide position.The two ends of described slide block are provided with caging bolt.During use, Installing above-mentioned altitude mixture control slide block on welding gun, then then welding gun clamping reinforcing bar extend in above-mentioned damper box, unscrews height Set lever on adjusting slider, by top shoe with glide fast relative slip and drive reinforcing bar below moves up and down, Make termination bottom reinforcing bar touch the cassette bottom of damper box, then the set lever on instrument is tightened, mention welding gun, stretching out of reinforcing bar Length and hoisting depth the most i.e. regulate complete.
The welding flux box of described step 3 is open-close type, is made up of two pieces of symmetrical semicolumn cylinders, two pieces of semicolumn cylinders Side straight line by gemel connection, opposite side connects and completes opening and closing movement by snap close, can quickly beat after welding Opening lock catch i.e. can be taken off welding flux box.When closing, welding flux box having reinforcing bar insert port, the diameter ratio of described reinforcing bar insert port is to be welded The diameter big 1～2mm of reinforcing bar, it is to avoid reinforcing bar insert port diameter is excessive causes reinforcing bar in welding process to offset when declining.
The flux constituent of described step 4 includes SiO by weight percentage2+TiO225～35%, MnO+Al2O3 25 ～35%, CaO+MgO 20～30%, CaF2+ FeO 5～15%, S≤0.03%, P≤0.04%, and calculated by formula (1) Obtain flux basicity B,
B = C a O + M g O + B a O + Na 2 O + K 2 O + CaF 2 + 0.5 ( M n O + F e O ) SiO 2 + 0.5 ( Al 2 O 3 + TiO 2 + ZrO 2 ) - - - ( 1 )
In formula, each compound all represents that mass percent, described basicity B are 0.9～1.4.
Height >=the 5mm of reinforcing bar surrounding weld seam after using said method to weld；Reinforcing bar relative to steel plate right angle deviation≤ 2°；The yield strength of welding point tensile strength >=125% × reinforcing bar, and tensile sample fracture position is in mother metal；By reinforcing bar After carrying out 90 ° of bendings, the equal flawless in Seam and heat effected zone produces.
In above-mentioned welding parameter, weld interval is 4～12s, adjusts accordingly according to bar diameter size, bar diameter The biggest, weld interval is the longest.Time between when soldered less than this value range, owing to weld interval is short, welding energy is not enough, causes molten Pond is little, and cooling is fast, and the metallic solution the being extruded part relatively low with reinforcing bar temperature can not organically be combined, thus easily causes reinforcing bar And exist between weld seam in gap, and gap along with slag inclusion；Time between when soldered higher than this value range, easily cause reinforcing bar and sting Limit, the undercut degree of depth is more than 0.5mm.
Reinforcing bar extension elongation is 7～13mm, the extension elongation of reinforcing bar with weld after the height of weld seam be substantially proportional to, in order to The height making weld seam meets the weld bead height required in JBJ 18-2012 " reinforcement welding control of acceptance ", when bar diameter is i.e. 18mm and following time, cannot be less than 3mm；When bar diameter be 20mm and above time, cannot be less than 4mm, therefore the stretching out of reinforcing bar Length is set to not less than 7mm, and when reinforcing bar extension elongation is more than 13mm, weld bead height meets standard-required but waste reinforcing bar, Therefore reinforcing bar extension elongation is not more than 13mm.
Reinforcing bar hoisting depth is 6～12mm, when reinforcing bar hoisting depth is less than this value range, due to reinforcing bar compression distance mistake Little (during reinforcement welding, descending depth is equal with the reinforcing bar hoisting depth that early stage adjusts), reinforcing bar declines the too early power-off of process, molten bath Metal temperature is low, it is impossible to be completely exhausted out by slag, thus causes face of weld to have a circle slag inclusion；When reinforcing bar hoisting depth is higher than being somebody's turn to do During value range, in welding process, slag is pressed into depths, molten bath when declining by reinforcing bar, and owing to weld interval is short, slag has little time ease Go out, easily cause weld seam slag inclusion inside.
Welding current size is 800～1700A, adjusts accordingly according to bar diameter size, and bar diameter is the biggest, weldering Connect electric current the biggest.When welding current is less than 800A, it is easily generated gap at reinforcing bar and solder design, gap has slag inclusion, it is impossible to Knock out；When welding current is higher than 1700A, easily there is undercut phenomenon, the undercut degree of depth >=0.3mm in reinforcing bar.
In flux constituent, SiO2+TiO2Mass percent be 25～35%.SiO2It is slag former, is also that pilot arc is steady Main component qualitatively, when content is too low, electric arc is unstable, and too high levels can cause viscosity coefficient of dross excessive, and mobility is bad, molten Slag emersion weld pool surface is relatively difficult, thus easily causes weld seam slag inclusion；TiO2Can improve the removability of slag, but TiO2Expensive, contain Amount should not be the highest；
MnO+Al2O3Mass percent be 25～35%.MnO can reduce the fusing point of slag, improves the flowing of slag Property, reduce surface tension, beneficially appearance of weld, the Mn content in weld metal can also be adjusted simultaneously, and play certain de-S Effect, when MnO content is on the low side, the effect above is inconspicuous, but has the tendency of dry slag during too high levels；Al2O3As slag former, The mobility of slag can be improved, and there is the raising concentrative effect of electric arc, electric arc can be reduced and produce the tendentiousness of arc blow, when When its content is too low, the viscosity of slag is too low, it is difficult to ensure preferable weld appearance, and during too high levels, the viscosity of slag increases, easily Cause weld seam slag inclusion；
The mass percent of CaO+MgO is 20～30%.CaO can improve the basicity of slag, and to the binding ability of S, P relatively By force, the content of S, P in weld metal can be reduced.MgO can improve the basicity of slag, increases the breathability of slag and reduces expansion Dissipate hydrogen content, but during too high levels, the fusing point of slag is too high, in weld metal, easily form slag inclusion；
CaF2The mass percent of+FeO is 5～15%.CaF2The mobility of slag can be increased, reduce pore, slag inclusion etc. Defect, improves appearance of weld, when its content is too low, it is impossible to play the effect above, electric arc can be caused during its too high levels unstable； FeO is the composition that raw material is brought into, reduce weld metal impact flexibility, general control at its content in relatively low scope；
The mass percent of S and P is respectively as follows: S≤0.03%, P≤0.04%.S and P is bring in raw material harmful miscellaneous Matter, needs to control its content, is more easily caused weld seam and produces pore and slag inclusion compared with S with P, and therefore the restriction to S should be tightened up；
The flux basicity B meeting mentioned component requirement is 0.9～1.4, and when flux basicity is less than 0.9, weld seam slag inclusion inclines Tropism increases, and when flux basicity is higher than 1.4, weld seam is easily generated arc blow phenomenon.
The invention has the beneficial effects as follows:
Welding method the most of the present invention improves nuclear power station built-in fitting welding efficiency, and traditional method uses manual electric arc welding gentle Body protection weldering average the most about 15 minutes and the 10 minutes time often welding a reinforcing bar, and use the buried arc stud welding of the present invention to weld The method that connects the most often is welded the time of a reinforcing bar and is about 3 minutes, and welding efficiency is approximately equivalent to 5 times of manual electric arc welding.
Welding method the most of the present invention solves weld seam slag inclusion common in buried arc stud welding and arc blow problem, and welding is once Qualification rate reaches more than 98%.
3. the weld seam smooth in appearance using welding method of the present invention to obtain is attractive in appearance, excellent in mechanical performance.
4., after welding many reinforcing bars on same steel plate, steel plate is substantially without deformation, it is not necessary to be corrected.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that altitude mixture control slide block used in the present invention is assemblied on welding gun.
Fig. 2 is reinforcing bar altitude mixture control slide block structure detailed maps used in the present invention.
Fig. 3 is open-close type welding flux box structural representation used in the present invention.
Reference in Fig. 1 to Fig. 3 is: buried arc stud welding welding gun gun body 1, reinforcing bar altitude mixture control slide block 2, top shoe 21, sliding block 22, rotary handle 23, open-close type welding flux box 3, reinforcing bar insert port 4, rapid latch 5, hinge 6.
Detailed description of the invention
Embodiment one
A kind of nuclear power station built-in fitting reinforcing bar buried arc stud welding welding method of the present invention, the steel plate of welded built-in fitting is 20mm Thick Q390B, the reinforcing bar of welded built-in fitting is the HRB400E of Φ 20mm, reinforcing bar length 700mm.The basicity of used solder flux is 1.0, the chemical constituent of this solder flux and percentage by weight be: SiO2+TiO2: 31.3%, MnO+Al2O3: 31.5%, CaO+MgO: 26.5%, CaF2+ FeO:10.0%, S:0.030%, P:0.032%.
As shown in Figure 1 to Figure 3, embodiment uses reinforcing bar arrangement for adjusting height adjust the extension elongation of reinforcing bar and promote height Degree, extension elongation and the hoisting depth of this enforcement regulation reinforcing bar are respectively 10mm and 9mm.Reinforcing bar arrangement for adjusting height includes submerged arc Stud welding gun and external damper box, described buried arc stud welding welding gun includes gun body 1 and the reinforcing bar height being connected in gun body Adjusting slider 2, described reinforcing bar altitude mixture control slide block 2 is made up of top shoe 21 and sliding block 22 and a rotatable handgrip 23, Top shoe 21 can do relative slip with sliding block 22；Described damper box is similar to welding flux box shape but aspect ratio welding flux box 3 high, This height difference is equal with the reinforcing bar extension elongation value required in welding condition, and in the present embodiment, the height of damper box is 110mm, the height of welding flux box 3 is 100mm.
A diameter of 23mm of the reinforcing bar insert port 4 on welding flux box 3 in the present embodiment, welding flux box is by two pieces of symmetrical semicolumns Cylinder forms, and the side straight line of two pieces of semicolumn cylinders is connected by hinge 6, and opposite side is connected by rapid latch 5, solder flux Box 3 is opened by rapid latch 5 and closes and carry out folding.
The present embodiment follows the steps below welding:
1) before welding, solder flux is dried 2 hours at 350 DEG C, and surface of steel plate carries out polishing rust cleaning, and the polishing of reinforcing bar two ends removes Rust, polishing region, surface of steel plate position to be welded is the border circular areas of diameter >=80mm, respectively polishes rust cleaning in reinforcing bar two ends, polishing length All not less than 20mm；
2) extension elongation and the hoisting depth of reinforcing bar are regulated.Open the bonnet of welding gun gun body 1, the gag lever post within turn with Spring degree on regulation welding gun, is adjusted to 19mm by the total compression amount of spring.Clamp reinforcing bar with welding gun, reinforcing bar is inserted into In damper box, then unscrew the rotary handle 23 of altitude mixture control slide block 2, by adjusting the relative position of top shoe 21 and sliding block 22 The cassette bottom touching damper box bottom reinforcing bar is made to complete the extension elongation regulation of reinforcing bar, then by the rotation hands of altitude mixture control slide block 2 Handle 23 is tightened, and mentions welding gun, and now reinforcing bar is 10mm relative to the extension elongation of welding flux box 3.Owing to the spring on welding gun is total Decrement is equal to reinforcing bar extension elongation and hoisting depth sum, and therefore the hoisting depth value of reinforcing bar subtracts equal to the total compression amount of spring Remove the extension elongation value i.e. 19mm-10mm=9mm of reinforcing bar.After the aforementioned total compression amount adjusting spring, then regulate stretching of reinforcing bar Going out length, the hoisting depth of reinforcing bar i.e. has determined that；
3) regulation welding parameter: weld interval is 5s, and current polarity is DC reverse connection, and size of current is 920～1050A；
4) pressing welding shift knob, welding machine is automatically performed welding procedure；
5) carry out after having welded striking slag.
In the present embodiment, the time of a piece reinforcing bar of average weldering is 3 minutes, and after welding, the average height of reinforcing bar surrounding weld seam is 6mm, reinforcing bar is relative to deviation≤2 °, right angle of steel plate；Welding point metal lographic examination is qualified, the defect such as pore-free, slag inclusion, crackle； The tensile strength average of weld joint samples is 620MPa, and fracture position is respectively positioned on parent material of reinforcement rebar, and this tensile strength values is more than steel 125% (i.e. 400MPa × 125%=500MPa) of the yield strength of muscle HRB400E, conformance with standard AWS D1.4/D1.4M: About the requirement of arc stud welding tensile strength in 2011 " Structural Welding Code Reinforcing Steel "；Press Sighting target quasi-AWS D1.1/D1.1M:2010 " Structural Welding Code Steel " Welded Joints is curved examination Testing detection, after reinforcing bar carries out 90 ° of bendings, the equal flawless in Seam and heat effected zone produces, and testing result is the most qualified.The present embodiment Welding first-time qualification rate reaches 98.75%.Embodiment two
A kind of nuclear power station built-in fitting reinforcing bar buried arc stud welding welding method of the present embodiment, the steel plate of welded built-in fitting is 20mm thickness Q390B, the reinforcing bar of welded built-in fitting is the HRB400E of Φ 22mm, reinforcing bar length 700mm.Solder flux used and embodiment One is identical.
The structure of the present embodiment is identical with embodiment one, and difference is to regulate extension elongation and the hoisting depth of reinforcing bar It is respectively 11mm and 10mm.In embodiment, the height of welding flux box 3 is 100mm, the reinforcing bar insert port 4 on welding flux box 3 a diameter of 24mm, the height of damper box is 111mm.
The welding step of the present embodiment is identical with embodiment one, and the total compression amount regulating spring in the present embodiment is 21mm, Welding parameter is: weld interval is 5.5s, and current polarity is DC reverse connection, and size of current is 950～1080A.
In embodiment, the time of a piece reinforcing bar of average weldering is 2.9 minutes, and after welding, the average height of reinforcing bar surrounding weldering bag is 6.5mm, reinforcing bar is relative to deviation≤2 °, right angle of steel plate；Welding point metal lographic examination is qualified, and pore-free, slag inclusion, crackle etc. lack Fall into；The tensile strength average of weld joint samples is 630MPa, and fracture position is respectively positioned on parent material of reinforcement rebar, and this tensile strength values is more than 125% (i.e. 400MPa × 125%=500MPa) of the yield strength of reinforcing bar HRB400E, conformance with standard AWS D1.4/D1.4M: About the requirement of arc stud welding tensile strength in 2011 " Structural Welding Code Reinforcing Steel "；Press Sighting target quasi-AWS D1.1/D1.1M:2010 " Structural Welding Code Steel " Welded Joints is curved examination Testing detection, after reinforcing bar carries out 90 ° of bendings, the equal flawless in Seam and heat effected zone produces, and testing result is the most qualified.The present embodiment Welding first-time qualification rate reaches 99%.
In addition to above-mentioned enforcement, the present invention can also have other embodiments.All employing equivalents or equivalent transformation are formed Technical scheme, all fall within the protection domain of application claims.

Claims (9)

1. a nuclear power station built-in fitting buried arc stud welding welding method, comprises the following steps:
Step one, rust cleaning of being polished position to be welded for built-in fitting surface of steel plate, polishing region is the border circular areas of diameter >=80mm, will Built-in fitting reinforcing bar two ends carry out polishing rust cleaning, polishing length all >=20mm；
Step 2, grip reinforcing bar with welding gun, utilize reinforcing bar arrangement for adjusting height adjust the extension elongation of reinforcing bar and promote height Degree；
Step 3, the reinforcing bar of step 2 is inserted in welding flux box and vertical top is pressed on built-in fitting steel plate；
The solder flux that step 4, injection have been dried；
Step 5, the welding parameter of regulation welding machine, weld interval is 4～12s, and current polarity is DC reverse connection, and size of current is 800～1700A；
Step 6, employing welding machine weld；
Step 7, welded after strike slag.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 1, it is characterised in that: described step one Built-in fitting steel plate is ordinary carbon steel or low-alloy steel, and described built-in fitting bar diameter is 16～32mm.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 1, it is characterised in that: in described step 2 Regulation reinforcing bar extension elongation 7～13mm, reinforcing bar hoisting depth 6～12mm.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 1, it is characterised in that: described step 2 Reinforcing bar arrangement for adjusting height includes external damper box and the adjusting slider being assemblied on welding gun, and the height of described damper box is more than The height of welding flux box, this height difference is equal with the reinforcing bar extension elongation value required in welding condition；Described adjusting slider By a pair mutual slide block slided and form for limiting the rotary handle of slide position.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 4, it is characterised in that: the two of described slide block End is provided with caging bolt.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 1, it is characterised in that: described step 3 Welding flux box is open-close type, is made up of two pieces of symmetrical semicolumn cylinders, and the side straight line of two pieces of semicolumn cylinders passes through hinge Connecting, opposite side is connected by snap close and completes opening and closing movement, when closing, welding flux box has reinforcing bar insert port,
The diameter bigger than the diameter of reinforcing bar to be welded 1～2mm of described reinforcing bar insert port.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 1, it is characterised in that: described step 4 Flux constituent includes SiO by weight percentage2+TiO225～35%, MnO+Al2O325～35%, CaO+MgO 20～ 30%, CaF2+ FeO 5～15%, S≤0.03%, P≤0.04%, and it is calculated flux basicity B by formula (1),
B = C a O + M g O + B a O + Na 2 O + K 2 O + CaF 2 + 0.5 ( M n O + F e O ) SiO 2 + 0.5 ( Al 2 O 3 + TiO 2 + ZrO 2 ) - - - ( 1 )
In formula, each compound all represents mass percent.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 7, it is characterised in that: described basicity B is 0.9～1.4.
Nuclear power station built-in fitting buried arc stud welding welding method the most according to claim 1, it is characterised in that: reinforcing bar four after welding Height >=the 5mm of all weld seams；Reinforcing bar is relative to deviation≤2 °, right angle of steel plate；Welding point tensile strength >=125% × reinforcing bar Yield strength, and tensile sample fracture position is in mother metal；After reinforcing bar is carried out 90 ° of bendings, the equal nothing in Seam and heat effected zone Crackle produces.
CN201610707879.2A 2016-08-23 2016-08-23 A kind of nuclear power station built-in fitting buried arc stud welding welding method Pending CN106180991A (en)

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Cited By (1)

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CN107239591A (en) * 2017-04-17 2017-10-10 中国核工业华兴建设有限公司 A kind of nuclear power large scale structure welding distortion prediction analysis method and its system

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