CN112355512A - Welding structure and welding method - Google Patents
Welding structure and welding method Download PDFInfo
- Publication number
- CN112355512A CN112355512A CN202011183715.7A CN202011183715A CN112355512A CN 112355512 A CN112355512 A CN 112355512A CN 202011183715 A CN202011183715 A CN 202011183715A CN 112355512 A CN112355512 A CN 112355512A
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- Prior art keywords
- welding
- pipe
- remelting
- surfacing
- spray
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- 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
-
- 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
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention provides a welding structure, which comprises a spray welding remelting pipe and a build-up welding pipe, wherein: the outer surface of the spray welding remelting pipe is provided with a spray welding remelting layer and a pre-surfacing layer, and the pre-surfacing layer is provided with a position close to the pipe orifice; the surface of the surfacing pipe is provided with a surfacing layer at the position close to the pipe orifice. A pre-surfacing layer is preset on the surface of one end of the spray welding remelting pipe, and then heating remelting is carried out, so that cracking of the spray welding remelting layer can be effectively prevented when the pipes are subjected to butt welding.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding structure and a welding method.
Background
The boiler superheater or the water-cooled wall runs in high-temperature and high-corrosivity substances for a long time, and a pipe without any anticorrosion measure is easily corroded by high temperature and chemically corroded, so that the pipe wall becomes thin and even explodes, and the production quality safety is seriously influenced.
The spray welding remelting technology and the surfacing technology are used as common anti-corrosion measures and are widely applied to protection of boiler superheaters and water-cooled walls. The surfacing technology is generally applied to areas with serious corrosion because a surfacing layer is thick and has good corrosion prevention effect; the spray welding remelting technology has the advantages of thin melting layer thickness and good corrosion prevention effect, and can be applied to general severe corrosion areas.
However, when the two technologies are used in combination, and the spray welding remelting pipe and the overlaying pipe are butt-welded, because the welding directly performed on the spray welding remelting layer can cause cracking and damage of the remelting layer, the existing technical scheme can only protect the joint of the overlaying pipe and the spray welding remelting pipe through a manual spray welding remelting technology after welding. The manual spray welding remelting process for the position of the light pipe or the crack of the spray welding remelting pipe is difficult to realize the quantitative index, the operation experience of technicians can be only passed, the quality is unstable, and meanwhile, the manual spray welding remelting cannot be carried out due to the limited space of the internal installation environment of the boiler. And the requirement on the surface cleanliness of the pipe is high by manual spray welding remelting, but a large amount of ash and slag are adhered to the surface of the pipe after the boiler runs for a period of time, and the welding quality is influenced by the manual spray welding remelting.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a welding structure and a welding method, which can effectively prevent the spray welding remelted layer from cracking when the pipes are butt welded by presetting a pre-surfacing layer on the surface of one end of the spray welding remelted pipe and then heating and remelting the pre-surfacing layer.
The embodiment of the invention adopts the technical scheme that:
in one aspect, an embodiment of the present invention provides a welding structure, including:
the outer surface of the spray welding remelting pipe is provided with a spray welding remelting layer and a pre-surfacing layer, and the pre-surfacing layer is provided with a position close to a pipe orifice;
the surfacing pipe is characterized in that a surfacing layer is arranged on the surface of the surfacing pipe close to the pipe orifice;
compared with the traditional welding mode, in the embodiment of the invention, a pre-surfacing layer is preset on the surface of one end of the spray welding remelting tube and then heated for remelting, so that the spray welding remelting layer is prevented from cracking when the tubes are subjected to butt welding, in addition, a surfacing layer is arranged on the surface of the surfacing tube close to the orifice, and when the spray welding remelting tube and the surfacing tube are remelted, the pre-surfacing layer and the surfacing layer are welded together, so that the welding quality is improved, and therefore, the pre-surfacing layer is formed: prevent the spray welding remelting pipe from cracking and realize mechanized operation. Therefore, the invention has simple and reasonable design, can save labor, improve welding efficiency and has excellent service performance.
Further, the spray welding remelting pipe and the overlaying welding pipe are both made of stainless steel materials.
Further, the spray welding remelting pipe and the overlaying welding pipe are both round steel pipes or square steel pipes.
Furthermore, a V-shaped welding seam is arranged between the spray welding remelting pipe and the overlaying welding pipe.
Further, the width of the pre-surfacing layer is 5-10 cm.
Further, the width of the weld overlay is 2.5 to 5 cm.
On the other hand, the embodiment of the invention also provides a welding method, which is applied to a welding structure, wherein the welding structure comprises a spray welding remelting pipe and a build-up welding pipe, and the method comprises the following steps:
presetting a pre-surfacing layer on the surface of one end of the spray welding remelting pipe;
surfacing a surfacing layer on the surface of one end of the surfacing pipe;
spraying the welding part by using flame;
the sprayed layer is heated to cause remelting thereof.
Compared with the traditional welding mode, in the embodiment of the invention, the surfacing layer is arranged on the surface of the surfacing pipe close to the pipe orifice, when the spray welding remelting pipe and the surfacing pipe are remelted, the pre-surfacing layer and the surfacing layer are welded together, so that the welding quality is improved, in addition, a section of pre-surfacing layer is preset on the surface of one end of the spray welding remelting pipe, and then heating remelting is carried out, so that the spray welding remelting layer can be effectively prevented from cracking and visible pre-surfacing layer when the pipes are butt welded: prevent the spray welding remelting pipe from cracking and realize mechanized operation. Therefore, the invention has simple and reasonable design, can save labor, improve welding efficiency and has excellent service performance.
Further, a segment of the build-up section is pre-built up using GTAW, GMAW or laser methods. GMAW (gas metal arc welding) is an electric arc welding process that achieves metal bonding by heating the metal with an electric arc established between a continuously fed filler metal (consumable electrode) and the workpiece, the arc and molten bath being completely shielded by an externally supplied gas or gas mixture; GTAW (gas tungsten arc welding), somewhat similar to gas metal arc welding except that its electrodes are made of tungsten, have a very high melting point, and because it does not melt, there is no loss during the welding process, the shielding gas is used as a flux, if necessary, a filler rod can be used to provide metal to the weld, and almost all metals can be welded by argon tungsten arc welding, including most steels, aluminum alloys, magnesium alloys, copper, some brasses and bronzes, titanium, gold and silver, which process can provide high quality welds to thin plates; the laser surfacing is a technological process for forming a metal coating with specific performance on the surface of a workpiece by using a fusion welding method, and the technology can prepare an alloy layer with special performance on the surface of a cheap material or carry out local repair on parts, and particularly has wide application prospect in the aspect of shaft part repair.
Further, the welding site was sprayed with mechanical automated flame.
Further, the sprayed layer is remelted using a mechanical auto-induction heating, flame heating or laser heating method.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic view of a weld configuration of an embodiment of the invention;
fig. 2 is a flow chart of a welding method of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1, fig. 1 is a schematic view of a welding structure of an embodiment of the present invention.
With reference to fig. 1, in one aspect, an embodiment of the present invention provides a welding structure, including:
the method comprises the following steps of spray welding a remelting tube 100, wherein a spray welding remelting layer 101 and a pre-surfacing layer 102 are arranged on the outer surface of the spray welding remelting tube 100, and the pre-surfacing layer 102 is arranged at a position close to a tube opening;
a surfacing layer 111 is arranged on the surface of the surfacing pipe 110 close to the pipe orifice;
compared with the traditional welding mode, in the embodiment of the invention, a section of pre-surfacing layer 102 is preset on the surface of one end of the spray welding remelting tube 100, and then heating remelting is carried out, so that cracking of the spray welding remelting layer 101 can be effectively prevented when the tubes are subjected to butt welding, in addition, a surfacing layer 111 is arranged on the surface of the surfacing tube 110 close to the tube opening, when the spray welding remelting tube 100 and the surfacing tube 110 are remelted, the pre-surfacing layer 102 and the surfacing layer 111 are welded together, the welding quality is improved, and therefore, the pre-surfacing layer 102: prevents the spray welding of the remelted tube 100 from cracking and realizes mechanized operation. Therefore, the invention has simple and reasonable design, can save labor, improve welding efficiency and has excellent service performance.
In one embodiment of the present invention, both the spray welded remelted tube 100 and the build-up welded tube 110 are stainless steel, which is acid, alkali, and salt resistant, and has great advantages in hardness, corrosion resistance, and heat resistance.
In one embodiment of the present invention, both the spray welded remelted tube 100 and the flash welded tube 110 are round steel tubes or square steel tubes.
In an embodiment of the present invention, a V-shaped weld 120 is further included between the spray welded remelted tube 100 and the build-up welded tube 110, and the V-shaped weld is welded during welding, so that the stability of the welded structure can be further improved.
In one embodiment of the present invention, the width of the pre-weld overlay 102 is 5 to 10 cm.
In one embodiment of the present invention, the width of the weld overlay 111 is 2.5 to 5 cm.
As shown in fig. 2, fig. 2 is a flow chart of a welding method according to an embodiment of the present invention.
In another aspect, with reference to fig. 2, an embodiment of the present invention further provides a welding method applied to a welded structure, where the welded structure includes a reflow pipe 100 and a build-up welded pipe 110, and the method includes:
presetting a pre-surfacing layer 102 on the surface of one end of the spray welding remelting tube 100;
overlaying a segment of overlaying layer 111 on the surface of one end of the overlaying tube 110;
spraying the welding part by using flame;
the sprayed layer is heated to cause remelting thereof.
Compared with the traditional welding mode, in the embodiment of the invention, the surfacing layer 111 is arranged on the surface of the surfacing pipe 110 close to the pipe orifice, when the spray welding remelting pipe 100 and the surfacing pipe 110 are remelted, the pre-surfacing layer 102 and the surfacing layer 111 are welded together, so that the welding quality is improved, in addition, a section of the pre-surfacing layer 102 is preset on the surface of one end of the spray welding remelting pipe 100 and then heated and remelted, so that the spray welding remelting layer 101 can be effectively prevented from cracking when the pipes are subjected to butt welding, and therefore, the pre-surfacing layer 102: prevents the spray welding of the remelted tube 100 from cracking and realizes mechanized operation. Therefore, the invention has simple and reasonable design, can save labor, improve welding efficiency and has excellent service performance.
In one embodiment of the invention, a segment of the build-up is pre-welded using GTAW, GMAW or laser methods. GMAW (gas metal arc welding) is an electric arc welding process that achieves metal bonding by heating the metal with an electric arc established between a continuously fed filler metal (consumable electrode) and the workpiece, the arc and molten bath being completely shielded by an externally supplied gas or gas mixture; GTAW (gas tungsten arc welding), somewhat similar to gas metal arc welding except that its electrodes are made of tungsten, have a very high melting point, and because it does not melt, there is no loss during the welding process, the shielding gas is used as a flux, if necessary, a filler rod can be used to provide metal to the weld, and almost all metals can be welded by argon tungsten arc welding, including most steels, aluminum alloys, magnesium alloys, copper, some brasses and bronzes, titanium, gold and silver, which process can provide high quality welds to thin plates; the laser surfacing is a technological process for forming a metal coating with specific performance on the surface of a workpiece by using a fusion welding method, and the technology can prepare an alloy layer with special performance on the surface of a cheap material or carry out local repair on parts, and particularly has wide application prospect in the aspect of shaft part repair.
In one embodiment of the invention, the welding part is sprayed by using mechanical automatic flame, so that the automation of the welding process is realized, and the welding efficiency is improved.
In one embodiment of the invention, the spray coating is remelted by using a mechanical automatic induction heating, flame heating or laser heating method, so that the working procedure can be operated far away from the welding structure, and the safety of operators is further ensured.
While the preferred embodiments and basic principles of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments, but is intended to cover various modifications, equivalents and alternatives falling within the scope of the invention as claimed.
Claims (10)
1. A welded structure, comprising:
the outer surface of the spray welding remelting pipe is provided with a spray welding remelting layer and a pre-surfacing layer, and the pre-surfacing layer is arranged at a position close to the pipe orifice;
the surfacing pipe, the position that the surface of surfacing pipe is close to the mouth of pipe is provided with the surfacing layer, the mouth of pipe of surfacing pipe with the mouth of pipe welding of spray-welding remelted tube is in the same place.
2. A welded structure according to claim 1, wherein: the spray welding remelting pipe and the overlaying welding pipe are both made of stainless steel materials.
3. A welded structure according to claim 2, wherein: the spray welding remelting pipe and the overlaying welding pipe are both round steel pipes or square steel pipes.
4. A welding method according to claim 1, characterized in that: and a V-shaped welding seam is further included between the spray welding remelting pipe and the overlaying welding pipe.
5. A welding method according to claim 1, characterized in that: the width of the pre-surfacing layer is 5-10 cm.
6. A welding method according to claim 1, characterized in that: the width of the weld overlay is 2.5 to 5 cm.
7. A welding method applied to a welded structure including a spray welded remelted tube and a build-up welded tube, the method comprising:
presetting a pre-surfacing layer on the surface of one end of the spray welding remelting pipe;
surfacing a surfacing layer on the surface of one end of the surfacing pipe;
spraying the welding part by using flame;
the sprayed layer is heated to cause remelting thereof.
8. A welding method according to claim 7, wherein a pre-weld overlay is preset on the surface of one end of the spray-welded remelting tube, and the method comprises the following steps: a segment of the build-up is pre-welded using GTAW, GMAW or laser methods.
9. A welding method as defined in claim 7, wherein the welding site is sprayed with flame, characterized in that: and spraying the welding part by using mechanical automatic flame.
10. A welding method as defined in claim 7, wherein the sprayed layer is heated to be remelted, characterized in that: remelting the sprayed layer by using a mechanical automatic induction heating method or a laser heating method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011183715.7A CN112355512A (en) | 2020-10-29 | 2020-10-29 | Welding structure and welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011183715.7A CN112355512A (en) | 2020-10-29 | 2020-10-29 | Welding structure and welding method |
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| CN112355512A true CN112355512A (en) | 2021-02-12 |
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| CN202011183715.7A Pending CN112355512A (en) | 2020-10-29 | 2020-10-29 | Welding structure and welding method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053024A (en) * | 2009-10-30 | 2011-05-11 | 中国石化集团第十建设公司 | Method for manufacturing test piece of hgdrogen induced cracking (HIC) and sulfide stress cracking (SSC) of welding material melting laid metal |
| CN104976201A (en) * | 2015-05-20 | 2015-10-14 | 株洲金韦硬质合金有限公司 | Single-face bonding method suitable for hard alloy strips in hard alloy hard-face machining process and application |
| CN105945393A (en) * | 2016-07-15 | 2016-09-21 | 中国核动力研究设计院 | Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station |
| CN106112263A (en) * | 2016-07-29 | 2016-11-16 | 西安交通大学 | Using T2 red copper as the titanium steel composite board laser of transition zone silk filling butt welding method |
| CN106270933A (en) * | 2015-05-13 | 2017-01-04 | 胜利油田金岛工程安装有限责任公司 | A kind of complex welding method of large aperture pipe end built-up welding corrosion resistant alloy composite steel tube |
-
2020
- 2020-10-29 CN CN202011183715.7A patent/CN112355512A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053024A (en) * | 2009-10-30 | 2011-05-11 | 中国石化集团第十建设公司 | Method for manufacturing test piece of hgdrogen induced cracking (HIC) and sulfide stress cracking (SSC) of welding material melting laid metal |
| CN106270933A (en) * | 2015-05-13 | 2017-01-04 | 胜利油田金岛工程安装有限责任公司 | A kind of complex welding method of large aperture pipe end built-up welding corrosion resistant alloy composite steel tube |
| CN104976201A (en) * | 2015-05-20 | 2015-10-14 | 株洲金韦硬质合金有限公司 | Single-face bonding method suitable for hard alloy strips in hard alloy hard-face machining process and application |
| CN105945393A (en) * | 2016-07-15 | 2016-09-21 | 中国核动力研究设计院 | Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station |
| CN106112263A (en) * | 2016-07-29 | 2016-11-16 | 西安交通大学 | Using T2 red copper as the titanium steel composite board laser of transition zone silk filling butt welding method |
Non-Patent Citations (1)
| Title |
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| 周利等: "轧辊制造技术与发展趋势", 《铸造》 * |
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Application publication date: 20210212 |