CN107052536A - A kind of low-alloy steel heat exchanger tube docking automatic soldering technique without packing material - Google Patents

A kind of low-alloy steel heat exchanger tube docking automatic soldering technique without packing material Download PDF

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Publication number
CN107052536A
CN107052536A CN201710313833.7A CN201710313833A CN107052536A CN 107052536 A CN107052536 A CN 107052536A CN 201710313833 A CN201710313833 A CN 201710313833A CN 107052536 A CN107052536 A CN 107052536A
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China
Prior art keywords
heat exchanger
exchanger tube
welding
tungsten electrode
alloy steel
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Granted
Application number
CN201710313833.7A
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Chinese (zh)
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CN107052536B (en
Inventor
谢彦武
郑明涛
王莉
伦辛杰
邹迪婧
张立德
李倩
殷帅
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Harbin Electric Group (qinhuangdao) Heavy Equipment Co Ltd
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Harbin Electric Group (qinhuangdao) Heavy Equipment Co Ltd
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Priority to CN201710313833.7A priority Critical patent/CN107052536B/en
Publication of CN107052536A publication Critical patent/CN107052536A/en
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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
    • B23K9/167Arc welding or cutting making use of shielding gas and of a non-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
    • B23K9/00Arc welding or cutting
    • B23K9/02Seam welding; Backing means; Inserts
    • 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
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/04Tubular or hollow articles
    • B23K2101/06Tubes
    • 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

Automatic soldering technique is docked the invention provides a kind of low-alloy steel heat exchanger tube, the technique comprises the following steps:Assemble heat exchanger tube I (1) and heat exchanger tube II (2);Install, debug welding equipment;Welding condition is set, soldering is carried out.The low-alloy steel heat exchanger tube docking automatic soldering technique that the present invention is provided, no packing material carries out the assembling of heat exchanger tube using frock (7), it is ensured that coaxial;Welding head coordinates clamping with frock (7), control the position of tungsten electrode and heat exchanger tube, welding parameter and operation requirement by this technique, the welding head centre of gyration drives tungsten electrode rotation to carry out from molten automatic welding, welding process is stable, weldquality and appearance of weld can be effectively controlled, heat exchanger tube banjo fixing butt jointing performance meets product requirement.

Description

A kind of low-alloy steel heat exchanger tube docking automatic soldering technique without packing material
Technical field
Automatic soldering technique is docked the present invention relates to a kind of low-alloy steel heat exchanger tube of heat exchanger-type pressure vessel and equipment, it is special It is not to be related to a kind of nuclear power to exchange heat main equipment especially with the Generation Ⅳ for representative such as HTGR, fast neutron reactor Steam generator low-alloy steel heat exchanger tube docking automatic soldering technique.
Background technology
The temperature gas cooled reactor steam generator spiral coil low-temperature zone of China's autonomous Design and space bent pipe feedwater connecting tube Between for low-alloy steel SA-213T22 heat exchanger tubes docking.Heat exchanger tube specification is external diameter 19mm, wall thickness 3mm, and diameter is small and wall thickness Greatly, according to steam generator design requirement, the docking of low-alloy steel SA-213T22 heat exchanger tubes need to meet the same of radiographing requirements When, appearance of weld requirement is more harsh.Welding process is both needed to ensure that heat exchanger tube butt weld fusion is good, and weld seam is controlled again Bilateral is not recessed, while can not be beyond heat exchange pipe surface 0.45mm, it is ensured that logical ball φ 12.1mm, welding difficulty is very big.Weld force Degree can neither be too strong, makes weldering meat too high it cannot be guaranteed that logical ball, weaker can not produce incomplete fusion or lack of penetration.
It is worth noting that, the heat exchanger tube of the steam generator of HTGR etc. is intensive, tube wall distance between heat exchanger tube Small, welding operation space is small, further increases the difficulty of welding operation, and such as laser welding or class laser welding technology can not Butt welding applied to heat exchanger tube on the steam generator of HTGR etc..
Due to the presence of above mentioned problem in the prior art, the present inventor is studied existing heat exchanger tube welding technique, Stable to study welding process, weld seam fusion is good, and weld seam bilateral is not recessed, it is ensured that lead to ball etc. meets the low of product requirement Steel alloy heat exchanger tube docks automatic soldering technique.
The content of the invention
In order to overcome above mentioned problem, present inventor has performed studying with keen determination, design suitable for diameter is small and wall thickness is big The automatic soldering technique of low-alloy steel heat exchanger tube docking, the automatic soldering technique is not required to set filling material in heat exchanger tube joint Material, by the strict control to welding condition etc., may be implemented in welding in small operating space, and welding process is stable, melts Close good, appearance of weld is attractive in appearance.
It is an object of the invention to provide a kind of low-alloy steel heat exchanger tube butt welding process, the technique includes following step Suddenly:
Step 1), assembling heat exchanger tube I 1 and heat exchanger tube II 2;
Step 2), install, debug welding equipment;
Step 3), welding condition is set, soldering is carried out.
The present invention have the advantage that including:
(1) welding procedure that the present invention is provided is directed to specific materials (low-alloy steel) heat exchanger tube, is not required to fill material during welding Material, weldquality and shaping are effectively guaranteed under applicable welding condition;
(2) welding procedure that the present invention is provided connects technique using automatic TIG welding, and the technique can be to welding condition and mistake Journey is programmed control, and welding process is stable, can obtain good appearance of weld and welding quality;
(3) welding procedure that provides of the present invention is intensive in the heat exchanger tube of steam generator, between heat exchanger tube tube wall apart from small, In the case that welding operation space is small, low-alloy between spiral coil low-temperature zone and space bent pipe feedwater connecting tube can be effectively realized Effective welding between steel heat exchanger tube;
(4) welding procedure that the present invention is provided determines welding condition and tungsten electrode according to specific heat exchanger tube, it is adaptable to Heat exchanger tube specification is the butt welding between external diameter about 19mm, wall thickness about 3mm, the low-alloy steel heat exchanger tube that diameter is small and wall thickness is big Connect so that welding quality is high, process stabilization is reliable, the uniform attractive in appearance, fusion of appearance of weld is good, welding efficiency is high, and through items Nondestructive testing and physicochemical property experiment, its result meet the steam generator heat exchange tube welding quality requirement of HTGR etc..
Brief description of the drawings
Fig. 1 is shown according to a kind of assembling structure schematic diagram of preferred embodiment of the invention;
Fig. 2 shows to be connect according to a kind of low-alloy steel SA-213T22 heat exchanger tube butt welding of preferred embodiment of the invention Head composition structural representation;
Fig. 3 shows the welding schematic diagram according to a kind of preferred embodiment of the invention;
Fig. 4 shows the tungsten electrode structural representation according to a kind of preferred embodiment of the invention.
Drawing reference numeral explanation:
1- heat exchanger tubes I;
2- heat exchanger tubes II;
4- tungsten electrode bars;
5- tungsten electrodes end circular cone;
6- tips platform;
7- frocks;
81- arms section;
82- welding platforms.
Embodiment
Below by drawings and examples, the present invention is described in more detail.Illustrated by these, the features of the present invention It will be become more apparent from clearly with advantage.
Special word " exemplary " is meant " being used as example, embodiment or illustrative " herein.Here as " exemplary " Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.Although each of embodiment is shown in the drawings In terms of kind, but unless otherwise indicated, it is not necessary to accompanying drawing drawn to scale.
The invention provides a kind of low-alloy steel heat exchanger tube butt welding process, the technique comprises the following steps:
Step 1), assembling heat exchanger tube I 1 and heat exchanger tube II 2;
Step 2), install, debug welding equipment;
Step 3), welding condition is set, soldering is carried out.
Step 1), assembling heat exchanger tube I 1 and heat exchanger tube II 2.
In the present invention, as shown in figure 1, carrying out heat exchanger tube I 1 using frock 7, the assembling of heat exchanger tube II 2 is positioned.The work 7 axial alignments for being used for minor diameter heat exchanger tube butt welding and fixation are filled, including for clamping minor diameter heat exchanger tube to be welded Two pressing plates, and other associated components.
In the present invention, heat exchanger tube I 1 and heat exchanger tube II 2 pipe end is not provided with groove, is directly fixed, welds.Institute State assembly method as follows:Any heat exchanger tube is clamped with a pressing plate of frock 7 first, the pressing plate is adjusted to pipe end setting position Place, then clamp another heat exchanger tube with another pressing plate.The position of two heat exchanger tubes is adjusted by frock 7, makes heat exchanger tube coaxial, and ensure Both sides heat exchanger tube adjacent pipe end is fitted close, and two heat exchange pipe end spacing are not more than 0.20mm.Structure is as shown in Figure 2 after assembling.
In a preferred embodiment, the heat exchanger tube I 1 is SA-213T22 heat exchanger tubes, and the heat exchanger tube II 2 is SA-213T22 heat exchanger tubes.
In a preferred embodiment, the external diameter of the heat exchanger tube I 1 is 19 ± 0.10mm, 3 ± 0.10mm of wall thickness; The external diameter of the heat exchanger tube II 2 is 19 ± 0.10mm, 3 ± 0.10mm of wall thickness;It is preferred that the external diameter of heat exchanger tube I 1 and heat exchanger tube II 2 And/or wall thickness is equal.
According to the material and specification of heat exchanger tube in the present invention, do not used in welding procedure any packing material such as welding wire or Melting ring, heat exchanger tube I 1 and heat exchanger tube II 2 are without setting groove.Conveying welding wire, the operation of finished edge when eliminating welding Step, reduces the influence of manual operation, reduces welding operation difficulty, has saved time cost, only need to strictly control two to change The spacing of heat pipe end is up to standard, is conducive to the control of welding quality.
Because the pollution at the butt welding quality exchange heat pipe position to be welded of heat exchanger tube is extremely sensitive.In order to ensure welding matter Amount, must clear up heat exchanger tube, not leave pollutant before weldering.For ease of cleaning treatment, heat pipe is exchanged before assembly and is cleaned.
Cleaning is as follows:The inside and outside wall exchanged using sand paper in the range of 20~25mm of heat pipe pipe end is polished, and is removed The debris such as the passivating film and oxide, oil, rust of heat exchanger tube pipe end inside and outside wall, are allowed to expose metallic luster, then with non-woven fabrics or in vain Cloth dips acetone exchange heat pipe inside and outside wall at least 20mm surface range and cleared up, until non-woven fabrics or calico nondiscolouring.This When, cleanliness control meets product requirement.
Step 2), install, debug welding equipment.
In a preferred embodiment, soldering is carried out by the argonaut welding equipment with tungsten electrode.It is described Welding equipment can be programmed and store to welding condition, can also realize data in the welding process work(such as monitoring in real time Can, welding efficiency is effectively increased, reduces influence of the human factor to weldquality in welding process.
In a preferred embodiment, because the docking between heat exchanger tube needs to carry out annular welds, welding can be set Standby welding head coordinates clamping with frock 7, is easy to manipulate welding head during rotating welding.
As shown in figure 3, the welding head is L-type welding head, welding head includes arm section 81 and welding platform 82.Dress After the completion of matching somebody with somebody, arm section 81 is parallel with heat exchanger tube, and welding platform 82 is set in outside heat exchanger tube.The welding head of this structure takes empty Between it is small, can the welding in the dense space of steam generator heat exchange tube.
In a preferred embodiment, welding head coordinates after installation with frock 7, and tungsten electrode points to two heat exchange end surfaces Joint, that is, when welding, tungsten electrode alignment end face joint carries out welding.
Adjust automatic welding head tungsten electrode position, when tungsten electrode and heat exchanger tube apart from it is too small when easily cause shaped on the outside of weld seam it is recessed Fall into, and the easy scaling loss of tungsten electrode causes weld seam tungsten inclusion, apart from it is excessive when it cannot be guaranteed that welding arc stablility, influences welding quality. Therefore, in heat exchanger tube in the radial direction, it is 1.5~2mm to control tungsten electrode tip and the distance of two heat exchange end surfaces joints.
Tungsten electrode plays conduction electric current, ignition current and pilot arc normal combustion as electrode.The specification of tungsten electrode with Weldment thickness and weld seam size of current are closely related, and its end shape has a significant impact to arc stability and appearance of weld. According to material, the specification of heat exchanger tube and fusing part, the welding requirements based on minor diameter, big wall thickness heat exchanger tube, and combine setting work Skill parameter, from the tungsten electrode of specific model.
As shown in figure 4, tungsten electrode is fixed in welding platform 82, the tungsten electrode includes tungsten electrode bar 4, the and of tungsten electrode end circular cone 5 It is arranged on the sophisticated platform 6 on tungsten electrode end circular cone 5.Wherein, a diameter of 1.6mm or 2.4mm of tungsten electrode bar 4, tungsten electrode end circle The coning angle of cone 5 is 25 °~30 °, a diameter of 0.35~0.40mm of sophisticated platform 6, the center of circle and the tungsten electrode end of sophisticated platform 6 The axis collinear of circular cone 5, axis and the axis collinear of tungsten electrode bar 4 of tungsten electrode end circular cone 5.
In a preferred embodiment, the tungsten electrode is thoriated tungsten electrode.Different types of tungsten electrode, its electron emissivity Difference, the arc voltage and weld penetration of formation are differed, and its contamination resistance and service life are also different.The electricity of thoriated tungsten electrode Sub- emissivity is high, increases current range allowable, reduces floating voltage, striking and stabilising arc performance is improved, compared to other Tungsten electrode is more suitable for welding operation in the present invention.
Implement before butt welding, above-mentioned welding equipment is installed, debugged, equipment is checked, it is ensured that each circuit Connection is correct, each function is normal, and welding gas etc., which is met, to be required, welding condition is programmed into deposit welder Manipulate in box.
Step 3), welding condition is set, soldering is carried out.
According to the material of heat exchanger tube, specification, welding shape, the situation in the absence of welding wire, through setting and testing repeatedly, obtain The welding condition of optimization, the welding condition is as follows:25~45A of background current, 60~120A of peak point current, arteries and veins Rush 1.5~2Hz of frequency, peak pulse duration 40%~50%, 20~35V of weldingvoltage, 75~90mm/min of speed of welding, front protecting Gas be helium (purity >=99.995%), 10~30L/min of gas flow, backing gas be argon gas (purity >= 99.997%), 10~40L/min of gas flow.
Welding current is the main parameter for determining weld penetration, and welding current is big, fusion penetration increase;When welding current is excessive Easily form exoncoma and the defect such as burn, also result in the phenomenons such as undercut, appearance of weld be bad;And electric current is small, it is difficult to control weldering Type is seamed into, incomplete fusion and the defect such as lack of penetration is easily formed, while low current causes productivity ratio to reduce and wastes protection gas.This Invention selected background current 25~45A, 60~120A of peak point current, to reach that good appearance of weld and weld seam are fused.
It is worth noting that, in the present invention, using two groups of protection gas in heat exchanger tube outside weldings position and heat exchanger tube Inside carries out welding protection respectively.Front protecting gas sprays the gas for protecting welding position for welding head, and it influences Situations such as welding arc spatial shape, arc energy density and welding process are splashed.By studying and verifying, from helium conduct Front protecting gas, it can stablize arc space form and arc energy density, improve appearance of weld, and reduction is splashed, eliminate and The generation of defect is prevented, weldquality is improved.
Backing gas is to be passed through the protection gas inside the heat exchanger tube of docking, and it selects argon gas.Argon gas density is big, uses Shi Buyi floatings are scattered and disappeared, and after argon gas outflow, can form stable airflow layer.
In a preferred embodiment, due to being directly combined welding, tungsten electrode using by low-alloy steel heat exchanger tube With heat exchanger tube in the longitudinal direction angle very little or it is almost parallel when, electric arc is difficult to be applied to two heat exchange end surfaces joints.Make Tungsten electrode is obtained with heat exchanger tube in angle that is bigger, being more suitable for so that electric arc quality is high, and then ensure that fusion quality, improves weldering Connect total quality.In the present invention, tungsten electrode is vertical with heat exchanger tube axis or almost vertical in two heat exchange end surfaces joints, excellent It is 90 ± 5 ° in two heat exchange end surfaces joints and the angle of heat exchanger tube axis to select tungsten electrode.
In a preferred embodiment, as shown in figure 3, by the heat exchanger tube I 1 assembled, heat exchanger tube II 2 by axis Vertical fixed, tungsten electrode is vertical with heat exchanger tube axis, and the centre of gyration in welding head welding platform 82 drives tungsten electrode rotation, Horizontal position welding position carries out automatic welding by heating two heat exchanger tube joints.
Require to carry out low-alloy steel heat exchanger tube butt welding using the welding condition and operation of the present invention, can reach good Good appearance of weld and weld seam fusion, are tested, its result meets HTGR steam through every nondestructive testing and physicochemical property The requirement of generator heat exchanger tube welding quality.
The low-alloy steel heat exchanger tube as described above docking automatic soldering technique provided using the present invention is detected after being welded As a result it is as follows:
Visual detection:Postwelding even weld is full, is visible by naked eyes defect, and outer wall is not recessed;
Commissure pore inner diameter measurement:Outer wall projection is no more than 0.45mm, leads to ball φ and is not less than 12.1mm;
Liquid Penetrant:Assay represents no liquid seepage without display;
Rod positive ray detects (RT):Inwall is not recessed;Flawless, undercut, incomplete fusion or lack of penetration;Circular display size Less than 0.6mm, number is no more than 4;
Room temperature tensile:Tensile strength >=415MPa;
(350 DEG C) stretchings of high temperature:Tensile strength >=401MPa;
Face is curved, root bend test:180 ° of angle of bend, any direction is more than 3mm crackle without wall scroll length on Extrude Face Or defect;
Metallographic test:The defects such as mother metal, weld dimensions pore-free, crackle.
Embodiment
The said welding method provided according to the present invention is to temperature gas cooled reactor steam generator spiral coil low-temperature zone and sky Between bend pipe feedwater connecting tube between low-alloy steel SA-213T22 heat exchanger tubes welded, heat exchanger tube specification be Φ 19 × 3mm, heat exchanger tube minimum tube wall spacing is 41mm, specific as follows:
Step 1), before welding, the position to be welded of low-alloy steel SA-213T22 heat exchanger tubes be polishing to seeing metal light Pool, and dip acetone with white non-woven cloth and wipe to non-woven fabrics nondiscolouring;
Exchange heat pipe is assembled:Any heat exchanger tube is clamped with a pressing plate of frock 7 first, the pressing plate is adjusted to pipe end Setting position, then clamp another heat exchanger tube with another pressing plate.The position of two heat exchanger tubes is adjusted by frock 7, makes heat exchanger tube same Axle, and ensure both sides heat exchanger tube tight fit;
Step 2), the welding head of TIG weld equipment and frock 7 are coordinated into clamping;Welding head coordinates with frock 7 to be installed Afterwards, tungsten electrode points to the position of two heat exchange end surfaces docking;In heat exchanger tube in the radial direction, control tungsten electrode tip and two heat exchange pipe ends The distance of the position of face contact is 1.5mm.From thoriated tungsten electrode, a diameter of 1.6mm of tungsten electrode bar 4, the circular cone of tungsten electrode end circular cone 5 Angle is 25 °, a diameter of 0.35mm of sophisticated platform 6;
Step 3), welded by the welding parameter and operation requirement of this technique, the welding condition that this technique is used Selection is as follows:25~45A of background current, 60~120A of peak point current, pulse frequency 2Hz, peak pulse duration 40%, weldingvoltage 30V, Speed of welding 80mm/min, front protecting gas is helium (purity 99.997%), gas flow 20L/min, back-protective gas Body is argon gas (purity 99.999%), gas flow 25L/min.During welding, tungsten electrode is in two heat exchange end surfaces joints and heat exchange Pipe axis is vertical.In advance in editor's welding procedure deposit welding equipment manipulation box, welding process passes through welding procedure control.
Welding product carries out following examine:
Visual detection:Postwelding even weld is full, is visible by naked eyes defect, and outer wall is not recessed;
Commissure pore inner diameter measurement:Outer wall projection is 0.15mm, leads to ball φ 12.7mm;
Liquid Penetrant:Assay represents no liquid seepage without display;
Rod positive ray detects (RT):Inwall is not recessed;Flawless, undercut, incomplete fusion or lack of penetration;
Room temperature tensile:Tensile strength 550MPa;
(350 DEG C) stretchings of high temperature:Tensile strength 384MPa;
Face is curved, root bend test:180 ° of angle of bend, any direction is more than 3mm crackle without wall scroll length on Extrude Face Or defect;
Metallographic test:The defects such as stomata, crackle are not found.
As a result show, welding product made from the present embodiment reaches above-mentioned test stone, meet HTGR steam hair Raw device middle-low alloy steel SA-213T22 heat exchanger tube butt welding quality requirements.
In the description of the invention, it is necessary to explanation, term " on ", " interior ", the orientation of the instruction such as " outer " or position pass It is to be described based on the orientation or position relationship under working condition of the present invention, to be for only for ease of the description present invention and simplifying, and It is not instruction or implies that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore It is not considered as limiting the invention.
The present invention is described in detail above in association with preferred embodiment and exemplary example.But need what is stated It is that these embodiments are only the illustrative explanations to the present invention, do not constitute any limit to protection scope of the present invention System.In the case of without departing from spirit and scope of the present invention, the technology of the present invention content and embodiments thereof can be carried out Various improvement, equivalencing or modification, these are each fallen within protection scope of the present invention.Protection scope of the present invention is with appended power Profit requires to be defined.

Claims (10)

1. a kind of low-alloy steel heat exchanger tube docks automatic soldering technique, it is characterised in that the technique includes:
Step 1), assembling heat exchanger tube I (1) and heat exchanger tube II (2);
Step 2), install, debug welding equipment;
Step 3), welding condition is set, soldering is carried out.
2. welding procedure according to claim 1, it is characterised in that step 1) in, the heat exchanger tube I (1) is low-alloy Steel SA-213T22 heat exchanger tubes, the heat exchanger tube II (2) is SA-213T22 heat exchanger tubes;And/or
The external diameter of the heat exchanger tube I (1) is 19 ± 0.10mm, 3 ± 0.10mm of wall thickness;The external diameter of the heat exchanger tube II (2) is 19 ± 0.10mm, 3 ± 0.10mm of wall thickness;
Preferably, the external diameter of heat exchanger tube I (1) and heat exchanger tube II (2) is equal and/or wall thickness is equal.
3. welding procedure according to claim 1, it is characterised in that step 1) in, heat exchanger tube I (1) and heat exchanger tube II (2) Pipe end not finished edge.
4. the welding procedure according to one of claims 1 to 3, it is characterised in that step 1) in, exchanged using frock (7) Heat pipe I (1) and heat exchanger tube II (2) are assembled, and the frock (7) includes being used for two pressures for clamping heat exchanger tube to be welded Plate;
Preferably, assembly method is as follows:Any heat exchanger tube first is clamped with a pressing plate of frock (7), the pressing plate is adjusted to pipe end Setting position, then another heat exchanger tube is clamped with another pressing plate, the position of two heat exchanger tubes is adjusted, makes two heat exchanger tubes coaxial and adjacent Pipe end is fitted close.
5. welding procedure according to claim 4, it is characterised in that step 2) in, pass through the automatic argon arc with tungsten electrode Soldering equipment carries out soldering;And/or
Tungsten electrode includes tungsten electrode bar (4), tungsten electrode end circular cone (5) and the sophisticated platform (6) being arranged on tungsten electrode end circular cone (5), Wherein, a diameter of 1.6mm or 2.4mm of tungsten electrode bar (4), the coning angle of tungsten electrode end circular cone (5) is 25 °~30 °, sophisticated platform (6) a diameter of 0.35~0.40mm, the center of circle of sophisticated platform (6) and the axis collinear of tungsten electrode end circular cone (5), tungsten electrode end The axis of circular cone (5) and tungsten electrode bar (4) axis collinear.
6. welding procedure according to claim 5, it is characterised in that step 2) in, by the welding head of welding equipment with Frock (7) coordinates clamping, and tungsten electrode points to two heat exchange end surfaces joints;And/or
In heat exchanger tube in the radial direction, tungsten electrode tip and two distances for exchanging heat end surfaces joints are 1.5~2mm.
7. welding procedure according to claim 1, it is characterised in that step 3) in, exchange heat pipe I (1) and heat exchanger tube II (2) when being welded, without using packing material such as welding wire or melting ring.
8. welding procedure according to claim 1, it is characterised in that step 3) in, the welding condition is as follows:Base Value 25~45A of electric current, 60~120A of peak point current, 1.5~2Hz of pulse frequency, peak pulse duration 40%~50%, weldingvoltage 20~ 35V, 75~90mm/min of speed of welding, front protecting gas are helium, purity >=99.995%, 10~30L/ of gas flow Min, backing gas is argon gas, purity >=99.997%, 10~40L/min of gas flow.
9. welding procedure according to claim 8, it is characterised in that step 3) in, by the heat exchanger tube I (1) assembled and Heat exchanger tube II (2) is vertically fixed by axis, and tungsten electrode is vertical with heat exchanger tube axis, and the centre of gyration in welding head drives tungsten Pole is rotated, and automatic welding is carried out by heating two heat exchanger tube joints in horizontal position welding position.
10. the welding procedure according to one of claim 1 to 9, it is characterised in that after the low-alloy steel heat exchanger tube welding Testing result is as follows:
A. visual detection:Postwelding even weld is full, is visible by naked eyes defect, and outer wall is not recessed;
B. commissure pore inner diameter measurement:Outer wall projection is no more than 0.45mm, leads to ball φ 12.1mm;
C. Liquid Penetrant:Assay represents no liquid seepage without display;
D. rod positive ray is detected:Inwall is not recessed;Flawless, undercut, incomplete fusion or lack of penetration;Circular display size is less than 0.6mm, number is no more than 4;
E. room temperature tensile:Tensile strength >=415MPa;
F. 350 DEG C of stretchings of high temperature:Tensile strength >=401MPa;
G. face is curved, root bend test:180 ° of angle of bend, on Extrude Face any direction without wall scroll length be more than 3mm crackle or Defect;
H. metallographic test:The defects such as mother metal, weld dimensions pore-free, crackle.
CN201710313833.7A 2017-05-05 2017-05-05 Automatic butt welding process for low alloy steel heat exchange tubes without filler Active CN107052536B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN110576289A (en) * 2019-09-26 2019-12-17 上海电气核电设备有限公司 Clamping tool for improving forming quality of butt weld of heat exchange tube and welding process thereof
CN111360376A (en) * 2020-03-12 2020-07-03 江苏宜安建设有限公司 Inert gas shielded dynamic welding without adding filler metal to pipeline

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