CN111774699A - Sulfur condenser pipe head structure and welding method thereof - Google Patents
Sulfur condenser pipe head structure and welding method thereof Download PDFInfo
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- CN111774699A CN111774699A CN202010489481.2A CN202010489481A CN111774699A CN 111774699 A CN111774699 A CN 111774699A CN 202010489481 A CN202010489481 A CN 202010489481A CN 111774699 A CN111774699 A CN 111774699A
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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
- B23K9/235—Preliminary treatment
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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
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A tube hole groove of a tube plate of a sulfur condenser is of an integral arc-shaped structure, a heat exchange tube extends out of the end face of the tube plate, the tube plate and the heat exchange tube are connected into a whole through a combined welding line, and the thickness of the welding line is not smaller than that of the heat exchange tube. The welding method of the pipe head structure of the sulfur condenser adopts manual argon tungsten-arc welding, the first pass adopts self-fluxing welding, and the other welding passes adopt filler wire welding; the current is 220-240A during backing welding, the voltage is 11-15V, the welding speed is larger than or equal to 100mm/min, the linear energy is 1.452-2.16 KJ/mm, a welding wire with the specification of 1.6mm is adopted during wire filling welding, the welding current is 180-200A, the voltage is 11-15V, the welding speed is larger than or equal to 110mm/min, and the linear energy is 1.08-1.636 KJ/mm. The invention optimizes the tube head root type and the welding space, provides key control measures for welding the heat exchange tube and the tube plate, solves the problems of difficult penetration of the welding root of the conventional tube head, easy tungsten clamping and low qualified rate of ray detection, and simultaneously ensures enough weld thickness by combining the weld type, thereby meeting the harsh requirement of the sulfur device in corrosive environment.
Description
Technical Field
The invention provides a pipe head structure of a sulfur condenser and a welding method thereof, and relates to the technical field of sulfur condensers of sulfur recovery devices in the industries of petroleum, chemical industry, coal chemical industry and the like.
Background
The sulfur condenser is mainly used for cooling process gas of a sulfur recovery device, the process gas comprises components such as hydrogen sulfide, sulfur dioxide and carbon dioxide, and the process gas is a typical stress corrosion environment and an acid dew point corrosion environment. The heat exchange tube and tube plate connecting joint (tube head structure) is applied to the environment for a long time, and when the tube head has insufficient weld thickness or welding defects, a large leakage risk exists; a tube head ray detection technology is introduced in similar use occasions, so that the quality of the tube head is strictly controlled, and the leakage risk is reduced; at present, a 45-degree V-shaped or deep U-shaped groove structure is mostly adopted in a common sulfur condenser, the net size of the root is generally less than or equal to 3mm, a manual or automatic argon arc welding-based welding method is adopted, the welding space at the root of a welding line is small, and defects are easily generated during welding; according to ray detection statistics, the common structure mostly has welding defects such as incomplete root fusion, incomplete penetration, tungsten inclusion, air holes and the like, and the total one-time qualification rate is less than 75%.
Disclosure of Invention
One of the purposes of the invention is to provide a pipe head structure of a sulfur condenser, which optimizes the groove type of a pipe head, forms structural parameters of the groove depth corresponding to the root size, ensures enough welding seam thickness and meets the harsh condition of a sulfur device in a corrosive environment.
The second purpose of the invention is to provide a welding method of a tube head structure of a sulfur condenser, which solves the problems that the welding root of the conventional tube head is not easy to be welded through and the qualified rate of radiographic inspection is low.
The technical scheme adopted by the invention is as follows:
a sulfur condenser tube head structure comprises a heat exchange tube and a tube plate, wherein a tube hole groove is formed in the end face of a tube hole in the tube plate, and the whole tube hole groove is of an arc-shaped structure; the heat exchange tube extends out of the end surface of the tube plate; the tube plate and the heat exchange tube are connected into a whole through a combined welding seam.
The arc radius of the integral arc-shaped structure of the pipe hole groove is 1.0-1.5 times of the groove depth and is not less than 4 mm.
The heat exchange tube extends out of the end face of the tube plate by 0.5-2.5 mm.
The combined welding line is composed of an arc welding line or an arc welding line and a fillet welding line, and the total thickness of the combined welding line is not less than the wall thickness of the heat exchange tube.
In order to complete the welding of the pipe head structure of the sulfur cooler, a welding method is provided, and the welding method comprises the following specific steps:
(1) controlling the depth deviation of the groove of the tube plate to be (0, +0.3 mm);
(2) the diameter of the pipe hole on the pipe plate is controlled to be within 0.3mm larger than the outer diameter of the heat exchange pipe;
(3) the end part of the heat exchange pipe needs to be cleaned before welding, and the cleaning length is more than or equal to the thickness of the pipe plate plus 40 mm;
(4) manual argon tungsten-arc welding is adopted during welding, a multi-pass welding process is adopted, the first pass adopts self-fluxing welding, the other welding passes adopt filler wire welding, and the thickness of each layer of welding seam is controlled within 1.5 mm;
(5) the current is 220-240A during backing welding, the voltage is 11-15V, the welding speed is more than or equal to 100mm/min, the linear energy is 1.452-2.16 KJ/mm, a welding wire with the specification of 1.6mm is adopted during wire filling welding, the welding current is 180-200A, the voltage is 11-15V, the welding speed is more than or equal to 110mm/min, and the linear energy is 1.08-1.636 KJ/mm; (6) welding two halves when each heat exchange tube is welded, wherein the running track of one half is in the direction from 5 o ' clock to 9 o ' clock and 11 o ' clock, and the arc of the other half is in the position from 5 o ' clock to 6 o ' clock and in the direction from 11 o ' clock to 12 o ' clock; (7) during welding, the welding gun needs to be swung in a small range, and the electric arc is controlled to deflect to one side of the tube plate.
The invention has the beneficial effects that:
the pipe hole groove of the pipe plate is integrally of an arc-shaped structure, the arc radius of the arc-shaped structure corresponds to the groove depth, the welding depth is ensured, the strength of a welding seam is met, meanwhile, the welding space of a welding root is increased, the possibility of welding defects is reduced, and the stress corrosion resistance is improved; the heat exchange pipe extends out of the end face of the pipe plate to form a combined welding seam structure of a groove welding seam and a fillet welding seam, so that a certain welding seam thickness is ensured, and the uniform corrosion resistance is improved. Through ray detection statistics, the primary qualified rate of the structure overall reaches more than 95%.
Drawings
FIG. 1 is a schematic structural view of a V-groove tube head in the prior art;
FIG. 2 is a schematic structural view of a deep U-groove tube head in the prior art;
FIG. 3 is a schematic view of a tube head structure according to example 1 of the present invention;
fig. 4 is a schematic view of a tube head structure according to embodiment 2 of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1, as shown in fig. 3, a sulfur condenser tube head structure has a heat exchange tube specification of Φ 32x3mm, and a tube hole groove depth of a tube plate is 2mm, that is, a groove weld thickness is 2 mm; the shape of the groove is arc-shaped as a whole, the arc radius is calculated to be 2mm according to the depth of 1.0 time, the arc radius is actually selected to be 4mm according to the principle that the minimum welding space of the root is 4 mm; considering that the wall thickness of the heat exchange tube is 3mm, the thickness of the uniform corrosion combined welding line is not less than 3mm, the tube head extends outwards to be 1.5mm, and the fillet weld is 1 mm.
Example 2, as shown in fig. 4, a sulfur condenser tube head structure has a heat exchange tube specification of Φ 45 × 5mm, and a tube hole groove depth of a tube plate is 4mm, that is, a groove weld thickness is 4 mm; the shape of the groove is arc-shaped, the arc radius is 6mm calculated according to the depth of 1.5 times, the arc radius is actually selected to be 6mm according to the principle that the minimum welding space of the root is 4 mm; considering that the wall thickness of the heat exchange tube is 5mm, considering that the thickness of the uniform corrosion combined welding line is not less than 5mm, the tube head extends outwards to be 0.5mm, and the fillet weld does not exist.
The welding method of the pipe structure of the sulfur condenser described in the above embodiment 1 and embodiment 2 includes the following specific steps:
(1) controlling the depth deviation of the groove of the tube plate 2 to be (0, +0.3 mm); can effectively ensure the root penetration and avoid the phenomenon of incomplete fusion of the root.
(2) The diameter of the pipe hole on the pipe plate 2 is controlled to be within 0.3mm larger than the outer diameter of the heat exchange pipe 1; also in order to effectively ensure the root penetration and avoid the phenomenon that the root is not fused.
(3) The end part of the heat exchange pipe needs to be cleaned before welding, and the cleaning length is more than or equal to the thickness of the pipe plate plus 40 mm; cleaning the pipe hole and the inner and outer surfaces of the heat exchange pipe, and polishing to remove oil stains, rust and other impurity substances until the metallic luster is exposed; the generation of air holes in the welding process can be effectively controlled.
(4) Manual argon tungsten-arc welding is adopted during welding, a multi-pass welding process is adopted, the first pass adopts self-fluxing welding, the other welding passes adopt filler wire welding, and the thickness of each layer of welding seam is controlled within 1.5 mm; the first process adopts self-fluxing welding, and also aims to effectively ensure root penetration, so that the phenomenon that the root is not fused can not occur. The thickness of each layer of welding seam of the filler wire welding is within 1.5mm, so that the generation of air holes in the welding process can be effectively controlled.
(5) The current is 220-240A during backing welding, the voltage is 11-15V, the welding speed is more than or equal to 100mm/min, the linear energy is 1.452-2.16 KJ/mm, a welding wire with the specification of 1.6mm is adopted during wire filling welding, the welding current is 180-200A, the voltage is 11-15V, the welding speed is more than or equal to 110mm/min, and the linear energy is 1.08-1.636 KJ/mm; (6) and each heat exchange tube is welded in two halves, wherein one half of the heat exchange tubes are welded in the direction from 5 o ' clock to 9 o ' clock and 11 o ' clock, and the other half of the heat exchange tubes are arc-off in the direction from 5 o ' clock to 6 o ' clock and 11 o ' clock to 12 o ' clock. Can ensure good fusion in the welding process and avoid the phenomenon that the side wall of the pipe hole of the pipe plate is not fused.
(7) During welding, the welding gun needs to be swung in a small range, electric arcs are controlled to be deflected to one side of the tube plate, and burning-through of the inner wall of the heat exchange tube in the welding process can be effectively prevented.
Claims (5)
1. The utility model provides a sulphur condenser tube head structure, includes heat exchange tube, tube sheet, characterized by: the end surface of the pipe hole on the pipe plate (2) is provided with a pipe hole groove, and the whole pipe hole groove is of an arc-shaped structure; the heat exchange tube (1) extends out of the end face of the tube plate (2); the tube plate (2) and the heat exchange tube (1) are connected into a whole through a combined welding line.
2. A sulfur condenser tube head construction as claimed in claim 1 wherein: the arc radius of the integral arc-shaped structure of the pipe hole groove is 1.0-1.5 times of the groove depth and is not less than 4 mm.
3. A sulfur condenser tube head construction as claimed in claim 1 wherein: the heat exchange tube (1) extends out of the end face of the tube plate (2) by 0.5-2.5 mm.
4. A sulfur condenser tube head construction as claimed in claim 1 wherein: the combined welding line is composed of an arc welding line or an arc welding line and a fillet welding line, and the total thickness of the combined welding line is not less than the wall thickness of the heat exchange tube.
5. A method of welding a sulfur condenser tube head structure as claimed in any one of claims 1 to 4, wherein: the method comprises the following specific steps:
(1) controlling the depth deviation of the groove of the tube plate (2) to be (0, +0.3 mm);
(2) the diameter of the pipe hole on the pipe plate (2) is controlled to be within 0.3mm larger than the outer diameter of the heat exchange pipe (1);
(3) the end part of the heat exchange pipe needs to be cleaned before welding, and the cleaning length is more than or equal to the thickness of the pipe plate plus 40 mm;
(4) manual argon tungsten-arc welding is adopted during welding, a multi-pass welding process is adopted, the first pass adopts self-fluxing welding, the other welding passes adopt filler wire welding, and the thickness of each layer of welding seam is controlled within 1.5 mm;
(5) the current is 220-240A during backing welding, the voltage is 11-15V, the welding speed is more than or equal to 100mm/min, the linear energy is 1.452-2.16 KJ/mm, a welding wire with the specification of 1.6mm is adopted during wire filling welding, the welding current is 180-200A, the voltage is 11-15V, the welding speed is more than or equal to 110mm/min, and the linear energy is 1.08-1.636 KJ/mm;
(6) welding two halves when each heat exchange tube is welded, wherein the running track of one half is in the direction from 5 o ' clock to 9 o ' clock and 11 o ' clock, and the arc of the other half is in the position from 5 o ' clock to 6 o ' clock and in the direction from 11 o ' clock to 12 o ' clock;
(7) during welding, the welding gun needs to be swung in a small range, and the electric arc is controlled to deflect to one side of the tube plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010489481.2A CN111774699A (en) | 2020-06-02 | 2020-06-02 | Sulfur condenser pipe head structure and welding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010489481.2A CN111774699A (en) | 2020-06-02 | 2020-06-02 | Sulfur condenser pipe head structure and welding method thereof |
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| Publication Number | Publication Date |
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| CN111774699A true CN111774699A (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010489481.2A Pending CN111774699A (en) | 2020-06-02 | 2020-06-02 | Sulfur condenser pipe head structure and welding method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756788A (en) * | 2021-02-19 | 2021-05-07 | 东方电气集团东方锅炉股份有限公司 | Welding process suitable for deep groove between tube plate and heat exchange tube |
| CN114434041A (en) * | 2020-11-04 | 2022-05-06 | 隆华科技集团（洛阳）股份有限公司 | Gas-shielded welding wire for improving weld performance of tube head of air cooler and welding method |
| CN114453706A (en) * | 2022-03-08 | 2022-05-10 | 常州市乐萌压力容器有限公司 | Crystallizer driving shaft welding process |
-
2020
- 2020-06-02 CN CN202010489481.2A patent/CN111774699A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114434041A (en) * | 2020-11-04 | 2022-05-06 | 隆华科技集团（洛阳）股份有限公司 | Gas-shielded welding wire for improving weld performance of tube head of air cooler and welding method |
| CN112756788A (en) * | 2021-02-19 | 2021-05-07 | 东方电气集团东方锅炉股份有限公司 | Welding process suitable for deep groove between tube plate and heat exchange tube |
| CN114453706A (en) * | 2022-03-08 | 2022-05-10 | 常州市乐萌压力容器有限公司 | Crystallizer driving shaft welding process |
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