CN105290579A - Single-layer and single-pass pipe row welding technology of ultra-supercritical boiler high-temperature screen type overheater - Google Patents
Single-layer and single-pass pipe row welding technology of ultra-supercritical boiler high-temperature screen type overheater Download PDFInfo
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- CN105290579A CN105290579A CN201510773593.XA CN201510773593A CN105290579A CN 105290579 A CN105290579 A CN 105290579A CN 201510773593 A CN201510773593 A CN 201510773593A CN 105290579 A CN105290579 A CN 105290579A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/035—Seam welding; Backing means; Inserts with backing means disposed under the seam
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a single-layer and single-pass pipe row welding technology of an ultra-supercritical boiler high-temperature screen type overheater. Compared with the prior art, the single-layer and single-pass pipe row welding technology is characterized in that firstly, the thickness of flat steel is reduced to 6 mm, and the restraint intensity of welding lines is reduced; secondly, alkaline soldering flux is adopted, and plasticity and tenacity of a connector are improved; and thirdly, small-standardization parameters are adopted for strict welding. On one hand, the heat input amount is reduced, and the high temperature standing time of a welding pool is shortened; and on the other hand, the crack resistance of the connector is improved. In addition, the thermal treatment parameters of corner welding lines are reasonably adjusted, the standard post-welding thermal treatment of 730-760 DEG C*1 h is carried out, and accordingly the hardness value of the corner welding lines is obviously reduced.
Description
Technical field
The present invention relates to boiler plant technical field, particularly relate to a kind of ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure.
Background technology
Boiler high temperature pendant superheater is used for boiler industry, superheater is arranged in burner hearth, the Main Function of superheater tube bank angle welding is heat transfer, and traditional ultra-supercritical boiler high temperature pendant superheater SA213-T91 pipe mining OE-S1CrMo2 Φ 2.0 welding wires/S-777MXT solder flux carries out submerged-arc welding composes and lay out, this welding manner reverse side Weld pipe mill of composing and laying out has longitudinal crack, and crack length is longer, expand fillet in normal shear center after checking and also find that there is interrupted longitudinal crack, and most of crackle occurs after being welded immediately, there is fire check and for solidification cracking in therefore traditional welding technique of composing and laying out, and this fire check directly affects the heat transfer coefficient of superheater angle welding, secondly, crystalline polamer in welding process is serious, find in the welding process of reality in addition: band steel is thick, narrow, postwelding welding stress cannot be adjusted by band steel, cause weld seam constraint (restraint) degree large, it is the main cause causing weld seam postwelding center longitudinal crack, weld-form factor is low is also the main cause causing crackle on Weld pipe mill crystallization line, band steel is narrow, welding process two welding torches are near, both sides angle welding postwelding weld seam is easily overlapping, influencing each other between weld seam is greatly the secondary main cause causing postwelding Weld pipe mill longitudinal crack, acid flux postwelding joint plasticity, Toughness Ratio basic flux postwelding joint is poor, be not suitable for Φ 51 × 8T91 pipe row submerged-arc welding to compose and lay out welding.
Summary of the invention
For above-mentioned Problems existing, the present invention aims to provide ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure, this welding procedure can reduce weld seam constraint (restraint) degree, improve joint plasticity, toughness, prevent weld metal and heat affected area grain growth, improve weld-form factor, increase joint anti-crack ability.
To achieve these goals, the technical solution adopted in the present invention is as follows:
Ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure, comprises the following steps:
(1) band steel that thickness is 6mm, width 12.5-13.7cm is is chosen; Pipe, high-pressure boiler compo pipe; Welding wire, is of a size of Φ 1.6mm; Solder flux, basic flux, basicity is 3:2;
(2) pipe welds front pretreatment with band steel, carries out polishing cleaning to the surface scale dirt of every root pipe, and adopts coloured enamel to mark tube welding face sealing wire, forms tack weld;
(3) carry out bevel process to each pretreated band steel, the equal symmetry in two sides of band steel has the groove of 30-45 °;
(4) method of submerged-arc welding is adopted to be welded by submerged-arc welding automation welding machine, welding process is undertaken orderly sending welding wire by submerged-arc welding automation welding machine, and above-mentioned basic flux is injected in the process of welding, the method of the band steel of the middle welding of pipe is between two adopted to weld in welding process, form superheater single-piece, a band steel will be welded between superheater single-piece between two again, compose and lay out by that analogy in this way;
(5) step (4) welding process adopts the welding of individual layer single-run welding connection, after the welding that individual layer single track welds is complete, back side air-arc cutting weld preheating temperature is 180 ~ 220 DEG C, welding current is 350 ~ 450A, weldingvoltage is 26.5 ~ 29V, speed of welding is 0.7-1.04m/min, after having welded, and back side air-arc cutting; (6) the pipe row after having welded is through grinder buffing;
(7) carry out 2h specification under the pipe after welding comes the temperature environment of 200 ~ 400 DEG C to disappear hydrogen process;
(8) carry out 1h specification under the pipe after welding comes the temperature environment of 730 ~ 760 DEG C to eliminate stress process;
(9) nondestructive testing.
Further, described pipe adopts the seamless high-pressure boiler compo pipe of SA213-T91, is of a size of Φ 51 × 8 × 12000mm or Φ 76 × 8 × 12000mm.
Further, described solder flux is fluorine alkalescent sintered flux.
Further, described welding wire adopts T91 welding wire.
Further, described Non-Destructive Testing comprises the intensity, angle welding hardness and the welding point crack resistance that detect the joint welded.
Further, be welded on described on welding flux backing and weld.
Further, described welded gasket is copper lining.
The invention has the beneficial effects as follows: the present invention mainly improves from the following aspects: one, the thickness reducing band steel is 6mm, and part welding stress is adjusted by band steel, reduces weld seam constraint (restraint) degree; Adopt basic flux.Improve joint plasticity, toughness; Adopt little normalized parameter strictly to weld, on the one hand reduce heat input, shorten welding pool high-temperature residence time, accelerate weld metal cool time to prevent weld metal and heat affected area grain growth; Secondly adopt little standardization parameter to improve weld-form factor, increase joint anti-crack ability; In addition, carry out reasonable adjusting to the heat treatment parameter of angle welding, make through the post weld heat treatment of 730 ~ 760 DEG C × 1h specification, angle welding hardness number obviously reduces.
Accompanying drawing explanation
Fig. 1 is prior art pipe assembly welding of the present invention seam section macrograph.
Fig. 2 is prior art weld seam section macrograph of the present invention.
Fig. 3 is hardness result figure before angle welding heat treatment of composing and laying out.
Fig. 4 is for for angle welding of composing and laying out is for by hardness result figure after heat treatment.
Detailed description of the invention
In order to make those of ordinary skill in the art can better understand technical scheme of the present invention, below in conjunction with embodiment, technical scheme of the present invention is further described.
For composing and laying out there is crack problem in angle welding, have collected all raw material (mother metal, wlding) quality certificate for SA213-T91 pipe row and raw material incoming test report, com-parison and analysis is carried out to material mechanical property, chemical element composition, confirm that raw material meet corresponding technical standard substantially, material property is not the main cause causing Weld pipe mill longitudinal crack.
embodiment one:ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure, comprises the following steps:
(1) the SA387-Gr91 band steel that thickness is 6mm, width 12.5cm is is chosen; Pipe, high-pressure boiler compo pipe, described pipe adopts the seamless high-pressure boiler compo pipe of SA213-T91, is of a size of Φ 51 × 8 × 12000mm; Welding wire, is of a size of Φ 1.6mm, and welding wire adopts T91 welding wire; Solder flux, basic flux, described solder flux is fluorine alkalescent sintered flux, basicity is 3:2, by using basic flux, crack position can be made obviously to depart from weld seam crystallization line and length is obviously short than acid flux, and basic flux postwelding joint quality has larger improvement than acid flux postwelding, improve joint plasticity, toughness;
(2) pipe welds front pretreatment with band steel, polishing cleaning is carried out to the surface scale dirt of every root pipe, and adopt coloured enamel to mark tube welding face sealing wire, form tack weld, the setting of this step is the dirt impurity effect welding quality preventing solder side too much, make welding point there is impurity and to cause the part hole of welding point occupied, thus affect the quality of angle welding;
(3) carry out bevel process to each pretreated band steel, the equal symmetry in two sides of band steel has the groove of 30-45 °, opens 30-45 ° before welding and welding root penetration can be made large, be conducive to preventing weld defect, firm welding;
(4) method of submerged-arc welding is adopted to be welded by submerged-arc welding automation welding machine, welding process is undertaken orderly sending welding wire by submerged-arc welding automation welding machine, and above-mentioned basic flux is injected in the process of welding, the method of the band steel of the middle welding of pipe is between two adopted to weld in welding process, form superheater single-piece, a band steel will be welded between superheater single-piece between two again, compose and lay out by that analogy in this way;
(5) step (4) welding process adopts the welding of individual layer single-run welding connection, the weld preheating temperature of individual layer single track welding is 180 ~ 220 DEG C, welding current is 350A, weldingvoltage is 26.5V, speed of welding is 0.7m/min, described in be welded on welding flux backing and weld, described welded gasket is copper lining, after having welded, back side air-arc cutting;
By the little standardization parameter adjustment of welding parameters, on the one hand reduce heat input, shorten welding pool high-temperature residence time, accelerate weld metal cool time to prevent weld metal and heat affected area grain growth; Secondly adopt little standard parameter to improve weld-form factor, increase joint anti-crack ability.
(6) the pipe row after having welded is through grinder buffing, and after grinder buffing, weld seam is beautiful, attractive in appearance;
(7) carry out 2h specification under the pipe after welding comes the temperature environment of 200 ~ 400 DEG C to disappear hydrogen process;
(8) carry out 1h specification under the pipe after welding comes the temperature environment of 730 ~ 760 DEG C to eliminate stress process, hardness result is analyzed: although T91 pipe row postwelding to disappear hydrogen process by 200 ~ 400 DEG C × 2h specification, but the hardness before angle welding heat treatment is still compiled high (as Fig. 3), occur that crackle tendency is larger; But sample is through the post weld heat treatment of 730 ~ 760 DEG C × 1h specification, and angle welding hardness number obviously reduces;
(9) nondestructive testing, described Non-Destructive Testing comprises the intensity, angle welding hardness and the welding point crack resistance that detect the joint welded.
embodiment two:with embodiment one unlike
(1) band steel that thickness is 6mm, width 13.7cm is is chosen; Pipe, high-pressure boiler compo pipe, described pipe adopts the seamless high-pressure boiler compo pipe of SA213-T91, is of a size of Φ 76 × 8 × 12000mm;
Step (4) welding process adopts the welding of individual layer single-run welding connection, and the weld preheating temperature of the individual layer single track welding of individual layer single track welding is 180 ~ 220 DEG C, and welding current is 450A, and weldingvoltage is 29V, and speed of welding is 1.04m/min;
Within the scope of the rational welding parameter of embodiment one, two, embodiment one is all relatively good with embodiment two welding effect.
The invention has the beneficial effects as follows:
1, arrange the pipe of SA213-T91, band steel thickness changes δ=6mm into from δ=9.5mm, and can reduce the constraint stress of pipe row welding, a part of welding deformation and welding stress can better be discharged by band steel.
2, SA213-T91 pipe row structure, adopts basic flux, effectively can control objectionable impurities, to reduce the tendency of solidification cracking, this is because one side postwelding plastic property of weld bead, toughness are higher than acid flux postwelding weld seam; Basic flux is more suitable for resembling the higher material welding of SA213-T91 mono-class alloying element on the other hand.
3, to SA213-T91 pipe row structure, T91 welding wire should be adopted to weld, make full use of crystal grain thinning element in welding wire: Mo, N, Nb etc. can form the feature with dispersion-strengtherning, make weld seam obtain thin brilliant and that segregation degree is lighter tissue, raising strength of joint and plasticity.
4, SA213-T91 pipe and SA387-Gr91 band steel adopt T91 welding wire to weld, pipe row disappear after hydrogen process by: 730 ~ 760 DEG C × 1h specification carries out the process that eliminates stress, and weld dimensions hardness is reduced, and meets related standard requirements completely.
Claims (7)
1. ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure, is characterized in that, comprise the following steps:
(1) band steel that thickness is 6mm, width 12.5-13.7cm is is chosen; Pipe, high-pressure boiler compo pipe; Welding wire, is of a size of Φ 1.6mm; Solder flux, basic flux, basicity is 3:2;
(2) pipe welds front pretreatment with band steel, carries out polishing cleaning to the surface scale dirt of every root pipe, and adopts coloured enamel to mark tube welding face sealing wire, forms tack weld;
(3) carry out bevel process to each pretreated band steel, the equal symmetry in two sides of band steel has the groove of 30-45 °;
(4) method of submerged-arc welding is adopted to be welded by submerged-arc welding automation welding machine, welding process is undertaken orderly sending welding wire by submerged-arc welding automation welding machine, and above-mentioned basic flux is injected in the process of welding, the method of the band steel of the middle welding of pipe is between two adopted to weld in welding process, form superheater single-piece, a band steel will be welded between superheater single-piece between two again, compose and lay out by that analogy in this way;
(5) step (4) welding process adopts the welding of individual layer single-run welding connection, after the welding that individual layer single track welds is complete, back side air-arc cutting weld preheating temperature is 180 ~ 220 DEG C, welding current is 350 ~ 450A, weldingvoltage is 26.5 ~ 29V, speed of welding is 0.7-1.04m/min, after having welded, and back side air-arc cutting;
(6) the pipe row after having welded is through grinder buffing;
(7) carry out 2h specification under the pipe after welding comes the temperature environment of 200 ~ 400 DEG C to disappear hydrogen process;
(8) carry out 1h specification under the pipe after welding comes the temperature environment of 730 ~ 760 DEG C to eliminate stress process;
(9) nondestructive testing.
2. ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure according to claim 1 is characterized in that: described pipe adopts the seamless high-pressure boiler compo pipe of SA213-T91, is of a size of Φ 51 × 8 × 12000mm or Φ 76 × 8 × 12000mm.
3. ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure according to claim 1 is characterized in that: described solder flux is fluorine alkalescent sintered flux.
4. ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure according to claim 1 is characterized in that: described welding wire adopts T91 welding wire.
5. ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure according to claim 1 is characterized in that: described Non-Destructive Testing comprises the intensity, angle welding hardness and the welding point crack resistance that detect the joint welded.
6. ultra-supercritical boiler high temperature pendant superheater pipe according to claim 1 row individual layer single track welding procedure is characterized in that: described in be welded on welding flux backing and weld.
7. the ultra-supercritical boiler high temperature pendant superheater pipe row individual layer single track welding procedure according to any one of claim 1-6 is characterized in that: described welded gasket is copper lining.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510773593.XA CN105290579A (en) | 2015-11-13 | 2015-11-13 | Single-layer and single-pass pipe row welding technology of ultra-supercritical boiler high-temperature screen type overheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510773593.XA CN105290579A (en) | 2015-11-13 | 2015-11-13 | Single-layer and single-pass pipe row welding technology of ultra-supercritical boiler high-temperature screen type overheater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106181091A (en) * | 2016-08-17 | 2016-12-07 | 浙江特富锅炉有限公司 | A kind of boiler welding process method |
| CN109623104A (en) * | 2018-10-26 | 2019-04-16 | 上海锅炉厂有限公司 | A kind of T91 panelized-tube-wall section scene counterpart mounting process method |
| CN110238494A (en) * | 2019-07-16 | 2019-09-17 | 江苏汇能锅炉有限公司 | A kind of mechanical welding procedure of boiler tube panel high-alloy steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106181091A (en) * | 2016-08-17 | 2016-12-07 | 浙江特富锅炉有限公司 | A kind of boiler welding process method |
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| CN109623104A (en) * | 2018-10-26 | 2019-04-16 | 上海锅炉厂有限公司 | A kind of T91 panelized-tube-wall section scene counterpart mounting process method |
| CN110238494A (en) * | 2019-07-16 | 2019-09-17 | 江苏汇能锅炉有限公司 | A kind of mechanical welding procedure of boiler tube panel high-alloy steel |
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Inventor after: Lu Zhengran Inventor after: Ni Huisheng Inventor after: Li Jie Inventor after: Wei Hongjie Inventor after: Liu Zhigang Inventor before: Zhou Xinliang Inventor before: Zhou Hao |
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Effective date of registration: 20160531 Address after: 200245 Shanghai city Minhang District Huaning Road No. 250 Applicant after: Shanghai Boiler Factory Co., Ltd. Address before: Chang Li Road 212327 Zhenjiang city of Jiangsu province Danyang City huangtang Town, No. 41 Applicant before: JIANGSU GREENLEAVES BOILER CO., LTD. |
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Application publication date: 20160203 |