CN111136398A - Boiler pipeline butt welding process - Google Patents
Boiler pipeline butt welding process Download PDFInfo
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- CN111136398A CN111136398A CN202010003010.6A CN202010003010A CN111136398A CN 111136398 A CN111136398 A CN 111136398A CN 202010003010 A CN202010003010 A CN 202010003010A CN 111136398 A CN111136398 A CN 111136398A
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/007—Heat treatment of ferrous alloys containing Co
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a boiler pipeline butt welding process, wherein the boiler pipeline is made of 9Cr3W3Co martensite heat-resistant steel, and the process comprises the following steps: sequentially carrying out normalizing treatment and tempering treatment on two boiler pipelines to be welded; arranging welding grooves at the butt joint ends of the two boiler pipelines subjected to tempering treatment; butt-jointing the welding grooves of the two boiler pipelines; preheating the welding groove before welding, wherein the temperature of the preheating before welding is more than or equal to 200 ℃; welding the boiler pipeline at the welding groove by adopting welding materials which are the same as the boiler pipeline so as to connect the two boiler pipelines; and (3) carrying out postweld heat treatment on the welded part of the two boiler pipelines, wherein the temperature of the postweld heat treatment is 760-790 ℃, and the heat preservation time of the postweld heat treatment is 6-8 h. The scheme solves the problem that the stability after welding is poor due to the existing welding process of 9Cr3W3Co steel.
Description
Technical Field
The invention relates to the technical field of welding processes, in particular to a boiler pipeline butt welding process.
Background
The 9Cr3W3Co is a novel martensite heat-resistant steel, and has the advantages that the 9Cr3W3Co steel has better structure stability in the temperature range of 630-650 ℃, and has better high-temperature creep property and steam oxidation resistance. Specifically, the endurance strength of the 9Cr3W3Co steel at 650 ℃ is 1.5 times that of the P92 steel, and meanwhile, the high-temperature steam oxidation resistance of the 9Cr3W3Co steel is equivalent to that of the P92 steel, so that the 9Cr3W3Co steel can be applied to the manufacturing of thick-wall parts such as large-caliber pipes and headers at the temperature range of 630 ℃ to 650 ℃, and small-caliber superheater and reheater pipes at the temperature of 630 ℃ to 650 ℃.
Generally, welding materials and their processing techniques are one of the keys to the successful manufacture of various types of components. However, since 9Cr3W3Co steel belongs to a new steel type, the research on the welding process of 9Cr3W3Co steel is less in China, so that the stability after welding is poor due to the existing welding process, which seriously restricts the development of 9Cr3W3Co steel.
Disclosure of Invention
The invention discloses a boiler pipeline butt welding process, which aims to solve the problem of poor stability after welding caused by the existing 9Cr3W3Co steel welding process.
In order to solve the problems, the invention adopts the following technical scheme:
a boiler pipeline butt welding process is characterized in that a boiler pipeline is made of 9Cr3W3Co martensite heat-resistant steel, and comprises the following steps:
sequentially carrying out normalizing treatment and tempering treatment on two boiler pipelines to be welded;
arranging a welding groove at the butt joint end of the two tempered boiler pipelines;
butt-jointing the welding grooves of the two boiler pipelines;
preheating the welding groove before welding, wherein the temperature of the preheating before welding is more than or equal to 200 ℃;
welding at the welding groove by adopting welding materials which are the same as the boiler pipelines so as to connect the two boiler pipelines;
and carrying out postweld heat treatment on the welded part of the two welded boiler pipelines, wherein the temperature of the postweld heat treatment is 760-790 ℃, and the heat preservation time of the postweld heat treatment is 6-8 h.
The technical scheme adopted by the invention can achieve the following beneficial effects:
in the boiler pipeline butt welding process disclosed by the embodiment of the invention, the boiler pipeline is made of 9Cr3W3Co martensite heat-resistant steel, so that the 9Cr3W3Co martensite heat-resistant steel can be better applied to the boiler pipeline, the boiler pipeline can have better strength, the service life of the boiler pipeline can be finally prolonged, and meanwhile, compared with other welding processes of 9Cr3W3Co martensite heat-resistant steel, in the embodiment of the invention, the homogeneous matching welding materials are adopted for welding, so that the stability after welding is better.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow chart of a boiler pipe butt welding process disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural view of a boiler pipe butt-welded according to an embodiment of the present invention.
Description of reference numerals:
100-boiler pipeline, 110-welding groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 2, an embodiment of the present invention discloses a boiler pipe butt welding process, wherein a material of a boiler pipe 100 is 9Cr3W3Co martensitic heat-resistant steel. The disclosed welding process comprises the following steps:
s101, sequentially carrying out normalizing treatment and tempering treatment on the two boiler pipelines 100 to be welded, so that the internal stress of the two boiler pipelines 100 to be welded is smaller.
And S102, arranging a welding groove 110 at the butt joint end of the two tempered boiler pipelines 100. The welding groove 110 may be a V-shaped groove, and of course, the welding groove 110 may have other shapes, and the invention is not limited to the specific shape of the welding groove 110.
And S103, butting the welding grooves 110 of the two boiler pipelines 100 so as to prepare for subsequent welding.
S104, preheating the welding groove 110 before welding, wherein the temperature of the preheating before welding is more than or equal to 200 ℃.
And S105, welding the boiler pipeline 100 at the welding groove 110 by adopting welding materials which are the same as the boiler pipeline 100 (namely, the materials of the boiler pipeline 100) so as to connect the two boiler pipelines 100.
S106, performing postweld heat treatment on the welded part of the two boiler pipelines 100, wherein the temperature of the postweld heat treatment is 760-790 ℃, and the heat preservation time of the postweld heat treatment is 6-8 h.
In the embodiment disclosed by the invention, the mechanical property test is performed on the welding position of the two boiler pipelines 100 subjected to the heat treatment after welding, and specifically, as shown in table 1, table 1 shows the relevant mechanical properties of the welding position of the two boiler pipelines 100. As can be seen from table 1, the welded joint has high tensile strength and good elongation after fracture, and meanwhile, the impact power of the heat affected zone and the impact power of the weld heat affected zone of the welded joint are both greater than 40J, and the lateral bending test is qualified, so that the welded joint has high strength and good toughness, and the stability of the two boiler pipes 100 after welding can be proved to be good.
TABLE 1
As can be seen from the above, in the boiler pipeline butt welding process disclosed in the embodiment of the present invention, the material of the boiler pipeline 100 is 9Cr3W3Co martensite heat-resistant steel, so that the 9Cr3W3Co martensite heat-resistant steel can be better applied to the boiler pipeline 100, so that the boiler pipeline 100 can have better strength, and finally the service life of the boiler pipeline 100 can be prolonged.
Meanwhile, in the embodiment disclosed by the invention, welding materials which are the same as those of the boiler pipeline 100 are adopted for welding at the welding groove 110, and the method can comprise the following steps:
step A1, backing welding is carried out at the welding groove 110 by manual argon arc welding by adopting welding wires which are the same as the boiler pipeline 100, so that two boiler pipelines 100 which need to be welded can be preliminarily fixed, and the boiler pipeline 100 can be prevented from generating an offset phenomenon during welding. Meanwhile, in order to improve work efficiency, the diameter of the welding wire may be 2.4mm, thereby achieving finer preliminary welding.
Step a2, after backing welding, welding may be performed at the welding groove 110 by manual arc welding using a welding rod that is homogenous to the boiler pipe 100, thereby improving the stability of the welding. Of course, in order to improve the working efficiency, the diameter of the welding rod can be 2.6-3.2 mm.
Correspondingly, adopt and weld the welding wire with boiler pipeline 100 is through manual argon arc welding and carry out backing weld in welding groove 110 department and adopt and weld the welding rod with boiler pipeline 100 is homogeneous through manual electric arc welding and weld in welding groove 110 department, all can include:
adopt multilayer, multichannel welding process to weld at welding groove 110 department, compare in adopting individual layer, single pass welding process, adopt multilayer, multichannel welding process can improve the welded quality, and is concrete, and the in-process that carries out next welding, the produced high temperature of next welding can play the effect of thermal treatment to last welding to can improve the plasticity of weld metal, and then can improve the welded quality. Meanwhile, the welding groove 110 is welded by adopting a multilayer and multi-pass welding process, so that the welding area is relatively balanced, and the welding effect is relatively good.
Meanwhile, in the process of welding at the welding groove 110 by manual arc welding using a multi-layer, multi-pass welding process, in a preferred embodiment, the thickness difference between adjacent welding passes may be smaller than the diameter of the welding rod, and at the same time, the width of each layer of welding pass may be smaller than three times the diameter of the welding rod. In such a mode, the heat treatment effect between the adjacent welding beads is better, and the adjacent welding beads can be better welded, so that the overall welding quality is better.
Based on this, in the process of welding at the welding groove 110 by adopting a multilayer and multi-pass welding process, in order to ensure that the effect of each welding is better, the slag cleaning operation can be carried out between two adjacent welding, thereby preventing the welding slag generated by the previous welding from influencing the welding effect of the next welding. Certainly, the mode of welding slag clearance can have the multiple, for example, can knock out the welding slag through the instrument, and is preferred, and the welding slag clearance operation can be for adopting the mode clearance welding slag of emery wheel polishing, and this kind of mode can be so that the welding surface after the welding slag clearance comparatively levels to conveniently carry out next welding.
Meanwhile, because the high temperature generated by the next welding can only perform the heat treatment effect on part of the welding metal formed by the previous welding, in order to improve the welding quality, the welding position can be preheated before the next welding, so that the temperature of the welding position is 240-260 ℃, and the welding quality of each welding can be improved.
Meanwhile, in the process of backing welding at the welding groove 110 by manual argon arc welding by adopting a welding wire which is the same as that of the boiler pipeline 100, the heat input is less than or equal to 13KJ/cm, the single-layer welding thickness is less than or equal to 2.4mm, and the width of a single-channel welding line is 4-9 mm. In the mode, the welding quality of backing welding can be improved, and meanwhile, the single-layer welding thickness is less than or equal to 2.4mm and the width of a single welding seam is 4-9 mm, so that the welding quality of each backing welding is high.
Similarly, after backing welding, in the process of welding at the welding groove 110 by adopting a welding rod which is the same as the boiler pipeline 100 through manual arc welding, the heat input is less than or equal to 18KJ/cm, the single-layer welding thickness is less than or equal to 3mm, and the width of a single welding line is 8-11 mm, so that the welding quality of each welding line is higher.
In the implementation disclosed by the invention, the welding process can further comprise the step of carrying out argon filling protection treatment on the boiler pipeline 100, the argon can play a role in isolating air, and in the specific working process, the argon can isolate the air outside the welding groove 110, so that the oxidation of the welding groove 110 can be prevented.
Specifically, the argon filling flow is 10L-20L/min before welding is carried out at the welding groove 110 by adopting a welding material which is the same as the boiler pipeline 100, and the argon filling flow is 8L-10L/min and the purity of the argon is more than 99.99 percent in the process of welding at the welding groove 110 by adopting the welding material which is the same as the boiler pipeline 100.
Meanwhile, in the embodiment of the present invention, after the welding grooves 110 are formed at the butt ends of the two tempered boiler pipes 100, the welding grooves 110 may be polished and cleaned first, and then the welding process is performed. In this way, the flatness of the welding groove 110 after polishing is good, thereby facilitating welding. Specifically, grinding by using a grinding wheel can be adopted, and of course, other grinding and cleaning modes can be adopted, and the invention is not limited to the specific cleaning mode.
In the embodiment of the present invention, in order to make the strength of the boiler pipe 100 after butt joint better, between performing welding and post-welding heat treatment at the welding groove 110 by using a welding material that is the same as that of the boiler pipe 100, the method may further include: cooling to 100-200 ℃ at a cooling rate of 150 ℃/h, and preserving heat for 1h, so that postweld heat treatment can be better performed.
Meanwhile, in order to facilitate detection and control of the temperature during the pre-weld heat treatment and the post-weld heat treatment of the boiler pipe 100, in the embodiment of the present invention, the temperature can be detected and controlled by thermocouples for both the pre-weld heat treatment and the post-weld heat treatment, so that the temperature of the post-weld heat treatment is easy to control, and further, the working efficiency is improved.
Meanwhile, after performing the post-weld heat treatment on the welded portion of the two welded boiler pipes 100, the method may further include: air cooling to 100-200 ℃ at a cooling rate of 150 ℃/h, and after heat preservation for 1h, heating to 760-790 ℃ at a heating rate of 80 ℃/h in an induction heating mode. Under the condition, the effect of postweld heat treatment is better, and the working efficiency can be improved.
In the above embodiments of the present invention, the difference between the embodiments is mainly described, and different optimization features between the embodiments can be combined to form a better embodiment as long as they are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a boiler pipe butt welding technology, the material of boiler pipe (100) is 9Cr3W3Co martensite heat-resistant steel, its characterized in that includes:
sequentially carrying out normalizing treatment and tempering treatment on two boiler pipelines (100) to be welded;
arranging a welding groove (110) at the butt joint end of the two tempered boiler pipelines (100);
butt-jointing the welding grooves (110) of the two boiler pipelines (100);
preheating the welding groove (110) before welding, wherein the temperature of the preheating before welding is more than or equal to 200 ℃;
welding at the welding groove (110) by adopting welding materials which are the same as those of the boiler pipeline (100) so as to connect the two boiler pipelines (100);
and carrying out postweld heat treatment on the welding position of the two welded boiler pipelines (100), wherein the temperature of the postweld heat treatment is 760-790 ℃, and the heat preservation time of the postweld heat treatment is 6-8 h.
2. The boiler pipe butt welding process of claim 1, wherein welding at the welding groove (110) with a welding material that is homogenous with the boiler pipe (100) comprises:
adopting a welding wire which is the same as the boiler pipeline (100) to perform backing welding at the welding groove (110) through manual argon arc welding, wherein the diameter of the welding wire is 2.4 mm;
and after the bottoming welding, welding rods which are the same as the boiler pipeline (100) are adopted to weld the welding groove (110) through manual arc welding, and the diameter of each welding rod is 2.6-3.2 mm.
3. The boiler pipe butt welding process according to claim 2, wherein the performing of the backing welding at the welding groove (110) by the manual argon arc welding using the welding wire homogeneous with the boiler pipe (100) and the performing of the welding at the welding groove (110) by the manual arc welding using the welding rod homogeneous with the boiler pipe (100) each comprise:
and welding the welding groove (110) by adopting a multilayer and multi-pass welding process.
4. The boiler pipe butt welding process of claim 3, wherein welding at the welding groove (110) is performed using a multi-layer, multi-pass welding process comprising:
carrying out welding slag cleaning operation between two adjacent welding processes, wherein the welding slag cleaning operation is to clean welding slag by adopting a grinding wheel polishing mode;
and preheating the welding position before the next welding so as to enable the temperature of the welding position to be 240-260 ℃.
5. The boiler pipe butt welding process according to claim 4, wherein the backing welding is performed at the welding groove (110) by manual argon arc welding using a welding wire homogeneous to the boiler pipe (100), comprising:
and performing backing welding by adopting manual argon arc welding, wherein the heat input is less than or equal to 13KJ/cm, the single-layer welding thickness is less than or equal to 2.4mm, and the width of a single welding seam is 4-9 mm.
6. The boiler pipe butt welding process of claim 4, wherein after the backing weld, welding at the welding groove (110) by manual arc welding with a welding rod that is homogenous with the boiler pipe (100) comprises:
and (3) adopting manual electric arc welding for welding, wherein the heat input is less than or equal to 18KJ/cm, the single-layer welding thickness is less than or equal to 3mm, and the width of a single welding seam is 8-11 mm.
7. The boiler tube butt welding process according to claim 1, further comprising subjecting the boiler tube (100) to an argon-filling protection treatment, wherein:
before welding at the welding groove (110), adopting welding materials which are the same as the boiler pipeline (100) to perform argon filling flow of 10L-20L/min, and in the process of welding at the welding groove (110), adopting welding materials which are the same as the boiler pipeline (100), performing argon filling flow of 8L-10L/min, wherein the purity of argon is more than 99.99%.
8. The boiler pipe butt welding process according to claim 1, wherein after the welding groove (110) is provided at the butt ends of the two tempered boiler pipes (100), the process further comprises: and polishing and cleaning the welding groove (110).
9. The boiler pipe butt welding process of claim 1, wherein between welding at the welding groove (110) with a welding material that is homogenous to the boiler pipe (100) and the post-weld heat treatment, further comprising: cooling to 100-200 ℃ at a cooling rate of 150 ℃/h, and keeping the temperature for 1 h;
and the pre-welding preheating treatment and the post-welding heat treatment are carried out by adopting thermocouples to detect and control the temperature.
10. The boiler pipe butt welding process according to claim 9, wherein the post-weld heat treatment is performed on the welded part of the two boiler pipes (100) after welding, and comprises:
air cooling to 100-200 ℃ at a cooling rate of 150 ℃/h, and after heat preservation for 1h, heating to 760-790 ℃ at a heating rate of 80 ℃/h in an induction heating mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010003010.6A CN111136398A (en) | 2020-01-02 | 2020-01-02 | Boiler pipeline butt welding process |
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| CN202010003010.6A CN111136398A (en) | 2020-01-02 | 2020-01-02 | Boiler pipeline butt welding process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992855A (en) * | 2020-09-02 | 2020-11-27 | 中国电建集团山东电力建设第一工程有限公司 | Welding and combined heat treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline |
| CN112872555A (en) * | 2021-01-05 | 2021-06-01 | 中国神华能源股份有限公司国华电力分公司 | Dissimilar steel welding method for 9Cr-3W-3Co series and 9Cr-2W series |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992855A (en) * | 2020-09-02 | 2020-11-27 | 中国电建集团山东电力建设第一工程有限公司 | Welding and combined heat treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline |
| CN112872555A (en) * | 2021-01-05 | 2021-06-01 | 中国神华能源股份有限公司国华电力分公司 | Dissimilar steel welding method for 9Cr-3W-3Co series and 9Cr-2W series |
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Application publication date: 20200512 |