CN107962312B - Method for preventing molten drops from dripping during surfacing of membrane type water-cooled wall tube plate - Google Patents
Method for preventing molten drops from dripping during surfacing of membrane type water-cooled wall tube plate Download PDFInfo
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- CN107962312B CN107962312B CN201711182605.7A CN201711182605A CN107962312B CN 107962312 B CN107962312 B CN 107962312B CN 201711182605 A CN201711182605 A CN 201711182605A CN 107962312 B CN107962312 B CN 107962312B
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- welding
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- wall tube
- tube plate
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for preventing molten drops from flowing down during surfacing of a membrane type water-cooled wall tube plate, which comprises the following steps of firstly fixing the water-cooled wall tube plate on a rotatable surfacing platform, horizontally placing flat steels at two ends of a tube, longitudinally dividing the tube part clamped at the upper part of the flat steel into four welding passes, and sequentially welding each welding pass, wherein the welding process of the welding passes is as follows: firstly, rotating a surfacing platform, placing one side of a welding bead on the highest horizontal plane of a water wall tube plate, enabling a gun mouth of a welding gun to be always positioned on the highest horizontal plane of the water wall tube plate, keeping the welding gun still, starting to rotate the surfacing platform after welding, enabling the other side of the welding bead to be positioned on the highest horizontal plane of the water wall tube plate, moving one section of the welding gun along the welding bead, then rotating the surfacing platform in the opposite direction to enable the previous welding bead to be kept on the high horizontal plane again, circularly and repeatedly rotating the surfacing platform until the whole welding bead is welded, and then rotating the surfacing platform to weld. The invention has the beneficial effect of leading the welding to be smooth and firm.
Description
Technical Field
The invention belongs to the technical field of welding, and relates to a method for preventing molten drops from flowing during surfacing of a membrane type water-cooled wall tube plate.
Background
The membrane water wall tube plate is formed by splicing and welding flat steel and a tube together, and the process of overlaying the corrosion-resistant material on the surface of the water wall tube plate comprises overlaying on the surface of the flat steel and overlaying on the surface of the tube. The surfacing on the surface of the flat steel is flat welding, and molten drops naturally transit by the gravity of the molten drops, so the operation is easy and the production efficiency is high. The surfacing on the pipe belongs to transverse welding, and because molten metal is easy to flow down under the action of gravity to generate defects of undercut, welding beading, incomplete penetration and the like, stress concentration and cracks are generated, so that the corrosion resistance of the water wall pipe is seriously influenced. At present, the generation of welding defects is reduced and the welding defects are improved remarkably by adopting a short-arc welding rod with smaller diameter and a proper current intensity and strip conveying method, but the methods have strong experience and are not easy to control. Therefore, it is very important to solve the problem of dripping during the build-up welding process.
Disclosure of Invention
The invention aims to provide a method for preventing molten drops from flowing during surfacing of a membrane type water-cooled wall tube plate, which solves the problem of molten drops flowing during surfacing.
The technical scheme adopted by the invention is that firstly, a water wall tube plate is fixed on a rotatable surfacing platform, flat steels at two ends of a tube are horizontally placed, the tube part clamped at the upper part of the flat steel is longitudinally divided into four welding passes, and each welding pass is welded in sequence, wherein the welding process of the welding passes is as follows: firstly, rotating a surfacing platform, placing one side of a welding bead on the highest horizontal plane of a water wall tube plate, enabling a gun mouth of a welding gun to be always positioned on the highest horizontal plane of the water wall tube plate, keeping the welding gun still, starting to rotate the surfacing platform after welding, enabling the other side of the welding bead to be positioned on the highest horizontal plane of the water wall tube plate, moving one section of the welding gun along the welding bead, then rotating the surfacing platform in the opposite direction to enable the previous welding bead to be kept on the high horizontal plane again, circularly and repeatedly rotating the surfacing platform until the whole welding bead is welded, and then rotating the surfacing platform to weld.
Further, the rotation of the surfacing platform ensures that the surfacing plane is always a horizontal plane.
Further, the included angle between the welding gun and the highest horizontal plane of the water wall tube plate is α and is kept unchanged.
Further, the magnitude of the angular velocity of rotation of the build-up platform remains unchanged.
Further, the time interval of the two times of movement of the welding gun is the same as the time of rotation of the surfacing platform along the same direction.
The invention has the beneficial effect of leading the welding to be smooth and firm.
Drawings
FIG. 1 is a schematic view of a water wall tube sheet in an initial state before welding;
FIG. 2 is a top view of a waterwall tube sheet.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
As shown in fig. 1 and 2, (a) is a pipe, (b) is a flat steel, black arrows indicate a welding torch direction, α indicates an angle between the welding torch and a welding surface, white arrows indicate a welding direction, and B, C indicates trisection points (AB, BC, and CD indicate three corresponding welding passes on a water wall pipe).
1) Preparation work
Before welding, the water wall tube plate is firstly fixed on a rotatable overlaying platform.
2) Welding with AB weld bead
Firstly, the surfacing platform rotates 90 degrees anticlockwise, the welding gun is positioned at the position of the point A on the water wall pipe, and the included angle between the welding gun and a welding plane is α. in the surfacing process, the surfacing platform rotates at a fixed angular velocity omega in the clockwise direction, α is kept unchanged (namely, the welding surface is always a horizontal plane), when the position of the welding gun reaches the horizontal line where the point B is positioned, the welding gun moves in the welding direction, the welding platform rotates at the same angular velocity omega in the anticlockwise direction, and the process is repeated until the surfacing of the AB welding bead is finished.
3) Welding of BC bead
And rotating the surfacing platform clockwise to enable the welding surface where the point C is located to be a horizontal plane, then starting welding, rotating the surfacing platform along the counterclockwise direction at an angular velocity omega, moving a welding gun along the welding direction when welding to the straight line where the point B is located, rotating the device along the clockwise direction at the same angular velocity omega by the surfacing platform, and repeating the process until the BC weld bead surfacing is finished.
4) Build-up welding of CD weld bead
And rotating the surfacing platform clockwise to enable the welding surface where the point C is located to be in a horizontal position, then rotating the surfacing platform clockwise, moving a welding gun along the welding direction when surfacing is carried out to the point D, rotating the surfacing platform anticlockwise, and repeating the operations until the CD weld bead is completely surfaced.
The invention effectively solves the problem that molten drops flow down in the previous surfacing process, inhibits the welding defect and improves the quality of a weldment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (5)
1. A method for preventing molten drops from flowing in surfacing of a membrane type water-cooled wall tube plate is characterized by comprising the following steps of: firstly fix the water-cooled wall tube sheet on rotatable build-up welding platform, the band steel level at pipe both ends is placed, will be located the pipe part that band steel upper portion pressed from both sides and vertically divide into four sections welding beads, welds each section welding bead in proper order, and welding bead welding process is as follows: firstly, rotating a surfacing platform, placing one side of a welding bead on the highest horizontal plane of a water wall tube plate, enabling a gun mouth of a welding gun to be always positioned on the highest horizontal plane of the water wall tube plate, keeping the welding gun still, starting to rotate the surfacing platform after welding, enabling the other side of the welding bead to be positioned on the highest horizontal plane of the water wall tube plate, moving one section of the welding gun along the welding bead, then rotating the surfacing platform in the opposite direction to enable the previous welding bead to be kept on the high horizontal plane again, circularly and repeatedly rotating the surfacing platform until the whole welding bead is welded, and then rotating the surfacing platform to weld.
2. The method for preventing the molten drops from flowing in the process of surfacing the membrane type water-cooled wall tube plate according to claim 1, which is characterized by comprising the following steps of: the rotation of the surfacing platform ensures that the surfacing plane is always a horizontal plane.
3. The method for preventing the molten drops from flowing during the surfacing of the membrane type water-cooled wall tube plate according to claim 1, wherein the included angle between the welding gun and the highest horizontal plane of the water-cooled wall tube plate is α and is kept constant.
4. The method for preventing the molten drops from flowing in the process of surfacing the membrane type water-cooled wall tube plate according to claim 1, which is characterized by comprising the following steps of: the magnitude of the angular velocity of rotation of the weld deposit platform remains unchanged.
5. The method for preventing the molten drops from flowing in the process of surfacing the membrane type water-cooled wall tube plate according to claim 1, which is characterized by comprising the following steps of: the time interval of the two times of movement of the welding gun is the same as the time of the rotation of the surfacing platform along the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711182605.7A CN107962312B (en) | 2017-11-23 | 2017-11-23 | Method for preventing molten drops from dripping during surfacing of membrane type water-cooled wall tube plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711182605.7A CN107962312B (en) | 2017-11-23 | 2017-11-23 | Method for preventing molten drops from dripping during surfacing of membrane type water-cooled wall tube plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107962312A CN107962312A (en) | 2018-04-27 |
| CN107962312B true CN107962312B (en) | 2020-05-22 |
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| CN201711182605.7A Active CN107962312B (en) | 2017-11-23 | 2017-11-23 | Method for preventing molten drops from dripping during surfacing of membrane type water-cooled wall tube plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110936077B (en) * | 2019-12-31 | 2021-11-26 | 南京衍构科技有限公司 | Method for generating surfacing path of membrane type water-cooled wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1022991C (en) * | 1992-05-22 | 1993-12-08 | 机械电子部哈尔滨焊接研究所 | Automatic overlaying welding for inner wall of elbow |
| CN102357710A (en) * | 2011-09-16 | 2012-02-22 | 东芝水电设备（杭州）有限公司 | Method for cladding wear-resisting layer on surface of runner hub of hydraulic turbine |
| CN202780173U (en) * | 2012-08-10 | 2013-03-13 | 武汉武船重型装备工程有限责任公司 | Spherical surface structure overlaying device |
| JP6315672B2 (en) * | 2014-03-10 | 2018-04-25 | 川崎重工業株式会社 | Overlay welding system |
| CN107096979A (en) * | 2017-06-10 | 2017-08-29 | 中国人民解放军装甲兵工程学院 | A kind of arc-welding of Shaft of Titanium Alloy class wear-out part increases material reproducing method |
| CN107297558A (en) * | 2017-06-20 | 2017-10-27 | 四川石油天然气建设工程有限责任公司 | A kind of corrosion resistant alloy composite elbow bead-welding technology |
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- 2017-11-23 CN CN201711182605.7A patent/CN107962312B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 两种轮心内孔自动堆焊方式的比较;孙松岭等;《电焊机》;20051128;第35卷(第11期);文章第44页 * |
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