CN110449697B - Inner pipe heating device for linear quencher and inner pipe welding method using same - Google Patents
Inner pipe heating device for linear quencher and inner pipe welding method using same Download PDFInfo
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- CN110449697B CN110449697B CN201910721259.8A CN201910721259A CN110449697B CN 110449697 B CN110449697 B CN 110449697B CN 201910721259 A CN201910721259 A CN 201910721259A CN 110449697 B CN110449697 B CN 110449697B
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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Abstract
The invention discloses an inner tube heating device for a linear quencher, which comprises an inner tube, an outer tube sleeved on the inner tube, and a connecting tube used for connecting the inner tube and the outer tube. The inner pipe heating device for the linear chiller can be conveniently inserted into the inner pipe of the linear chiller to heat the inner pipe, is convenient to operate and good in heating effect, can effectively maintain the heating temperature, and greatly improves the welding efficiency. The inner tube welding method for the linear quencher based on the inner tube heating device has the advantages of simple steps, convenience in operation, capability of well realizing pre-stretching welding of the inner tube and high working efficiency.
Description
Technical Field
The invention relates to the field of welding of inner pipes of linear quenchers, in particular to an inner pipe heating device for a linear quencher and an inner pipe welding method using the same.
Background
Along with the domestic petroleum refining and the development and utilization of large-scale ethylene engineering, the domestic demand on ethylene devices is increasing, and the linear quencher is most widely applied in the ethylene devices. The linear quencher adopts the structural design of a jacketed type slender inner pipe and a jacketed type slender outer pipe, and in the actual use process, the inner pipe of the linear quencher circulates high-temperature pyrolysis gas at about 1000 ℃, and high-temperature steam with relatively low circulating temperature exists between the outer pipe and the inner pipe, so that huge temperature difference exists between the inner pipe and the outer pipe, and the inner pipe can have a thermal extension phenomenon in the actual use process. In order to solve the problem of material extension in actual operation, the inner tube needs to be pre-stretched for a certain distance to be welded for elimination in manufacturing. Referring to fig. 1, there is shown a schematic axial cross-sectional view of an inner tube and an outer tube of a linear chiller with a gap reserved in the prior art, wherein a gap 103 is reserved between an inner tube 100 and a connecting tube 102, the gap is usually 8mm, and a pre-stretching space of the inner tube 100 is ensured by the gap 103, so that a thermal extension phenomenon is effectively avoided.
At present, domestic manufacturers usually adopt a ceramic block type heating device to pre-stretch an inner pipe when the inner pipe is welded. The ceramic block type heating device is composed of a plurality of ceramic block type heating rods which are connected in series through exposed copper core wires. Due to the structural characteristics of the ceramic block type heating device, the ceramic block type heating device has the following defects: (1) the ceramic block type heating rod has an extension expansion phenomenon during heating, so that a larger gap needs to be reserved between the ceramic block type heating rod and the inner pipe wall before the ceramic block type heating rod works, and the heating effect is influenced; (2) the porcelain block is fragile, so that the porcelain block type heating device needs extra attention when in use, and the operation is greatly influenced; (3) because the copper core of the copper core wire is exposed outside, short circuit and leakage accidents are easy to happen, and great potential safety hazards exist during use; (4) because the electric heating tolerance of the copper core wire is limited, the manufacturing length of the ceramic block type heating rod cannot be too long, and can only reach about 3 meters generally, for a longer inner tube, more ceramic block type heating rods are required to be connected in series for use, the copper core wire penetrates out from two ends of the inner tube to be communicated with a power supply, after the inner tube is pre-stretched, the ceramic block type heating rod at the welding position needs to be detached after power failure to be welded, and the inner tube is very easy to retract due to temperature reduction during welding, so that the welding is influenced, and the welding efficiency is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an inner tube heating device for a linear chiller, which can be conveniently inserted into an inner tube of the linear chiller to heat the inner tube, is convenient to operate and good in heating effect, can effectively maintain the heating temperature, and greatly improves the welding efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an inner tube heating device for linear chiller, linear chiller includes the inner tube, the cover is located outer tube on the inner tube, be used for connecting the inner tube with the connecting pipe of outer tube, inner tube heating device is used for heating the inner tube, inner tube heating device includes hollow device body, locates this internal heating element of device, fill out and locate this internal and lieing in the heat-conducting medium of heating element week side, the device body can be along the extending direction of inner tube is inserted and is located in the inner tube.
Preferably, the distance between the outer wall of the device body and the inner wall of the inner pipe is 2-3 mm.
Preferably, the heating unit is disposed along an extending direction of the apparatus body.
Preferably, the heating units are arranged uniformly along the circumferential direction of a cross section of the device body perpendicular to the extending direction of the inner pipe.
Preferably, the inner tube heating device further comprises a temperature measuring module arranged on the device body and used for measuring the temperature of the outer wall of the device body.
Further preferably, the temperature measuring modules are arranged at intervals along the extending direction of the device body.
Further preferably, the inner tube heating device further comprises a control unit, and the control unit is electrically connected with the heating unit and the temperature measuring module respectively and is used for receiving the temperature signal output by the temperature measuring module and adjusting the heating power of the heating unit.
Preferably, the device body has an insertion end located in the inner tube and a hand-held end located outside the inner tube, the hand-held end being fitted with a thermally insulated handle.
The invention also aims to provide an inner pipe welding method based on the inner pipe heating device, and in order to achieve the aim, the invention adopts the technical scheme that:
an inner tube welding method for a linear chiller for welding an inner tube and a connecting tube, comprising the steps of:
(1) the device body penetrates through the inner pipe and is inserted into the connecting pipe along the direction from the inner pipe to the connecting pipe, and the distance between the insertion end of the device body and one end, close to the inner pipe, of the connecting pipe is 80-120 mm;
(2) the control unit is started, the control unit drives the heating unit to operate, the heating unit transfers heat to the outer wall of the device body through a heat-conducting medium, the temperature measuring module detects the temperature of the outer wall of the device body and transmits a temperature signal to the control unit, the control unit sets a first target temperature range of the outer wall of the device body to be 500 +/-50 ℃, and the control unit adjusts the heating power of the heating unit according to the temperature signal output by the temperature measuring module, so that the temperature of the outer wall of the device body can be maintained in the first target temperature range;
(3) after the inner pipe is heated in the first target temperature range, the inner pipe extends towards the direction close to the connecting pipe and is in butt joint with the connecting pipe, after the butt joint is completed, the device body moves along the direction from the connecting pipe to the inner pipe, the inserting end moves into the inner pipe, and the distance between the inserting end and the end, close to the connecting pipe, of the inner pipe is 150-250 mm;
(4) welding the butt joint of the inner pipe and the connecting pipe, and after welding is finished, moving the device body along the direction from the inner pipe to the connecting pipe to enable the insertion end to be located in the connecting pipe, wherein the distance between the insertion end and one end, close to the inner pipe, of the connecting pipe is 80-120 mm;
(5) and adjusting the control unit to enable the control unit to set a second target temperature range of the outer wall of the device body to be 300 +/-50 ℃, adjusting the heating power of the heating unit according to the temperature signal output by the temperature measurement module by the control unit to enable the temperature of the outer wall of the device body to be maintained in the second target temperature range, and carrying out dehydrogenation treatment on the welding part of the inner pipe and the connecting pipe within the second target temperature range for 0.5-1 h.
Preferably, the inner tube welding method further comprises the steps of:
(6) and adjusting the control unit to enable the control unit to set a third target temperature range of the outer wall of the device body to be 670 +/-20 ℃, adjusting the heating power of the heating unit according to the temperature signal output by the temperature measurement module by the control unit to enable the temperature of the outer wall of the device body to be maintained in the third target temperature range, and performing local heat treatment on the welding part of the inner pipe and the connecting pipe for 1.5-2.5 hours.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the inner pipe heating device for the linear quencher has the following advantages that:
1) the structure is simple, the weight is light, the volume is small, the temperature rising speed is high, the stability is good, and the electric leakage accident is not easy to happen;
2) the gap between the outer wall of the device and the inner wall of the inner tube is small, the heating effect is good, and the integrated device body enables the inner tube to be heated uniformly;
3) the device can continuously heat the inner pipe, does not need to be powered off during welding, and can still maintain corresponding temperature, thereby avoiding the retraction of the inner pipe and improving the welding efficiency;
4) the device can effectively control the heating power of the heating unit, so that the heating temperature of the inner tube is stable, and the energy-saving and emission-reducing effects are good;
5) compared with a ceramic block type heating device, the ceramic block type heating device has long service life and greatly saves cost;
6) after the heating of an inner tube, can be under the circumstances of not cutting off the power supply convenient with the device remove to another inner tube in heat, very big improvement work efficiency.
The inner tube welding method based on the inner tube heating device is simple in steps and convenient to operate, can well achieve pre-stretching welding of the inner tube, and is high in working efficiency.
Drawings
FIG. 1 is a schematic axial cross-sectional view of an inner tube and an outer tube of a linear quencher with a gap reserved in the prior art;
fig. 2 is a schematic axial sectional view of the inner pipe heating apparatus of the present invention inserted in the inner pipe.
Wherein: 1. a device body; 1a, an insertion end; 1b, a handheld end; 2. a heating unit; 3. a heat-conducting medium; 4. a temperature measuring module; 5. a control unit; 6. a thermally insulated handle;
100. an inner tube; 101. an outer tube; 102. a connecting pipe; 103. a gap.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 2, an inner tube heating apparatus for a linear chiller, the linear chiller including an inner tube 100, an outer tube 101 fitted over the inner tube 100, a connecting tube 102 for connecting the inner tube 100 and the outer tube 101, and an inner tube heating apparatus for heating the inner tube 100, the inner tube heating apparatus including a hollow apparatus body 1, a heating unit 2 disposed in the apparatus body 1, and a heat transfer medium 3 filled in the apparatus body 1 and located on a peripheral side of the heating unit 2, the apparatus body 1 being capable of being inserted into the inner tube 100 along an extending direction of the inner tube 100. Here, the heating unit 2 is provided along the extending direction of the apparatus body 1, and the heating unit 2 is provided in plural, and is uniformly arranged along the circumferential direction of the section of the apparatus body 1 perpendicular to the extending direction of the inner pipe 100. The device body 1 is a heat-resistant stainless steel pipe, the heating unit 2 is an electric heating rod, and the heat-conducting medium 3 is magnesium oxide.
The integrated inner pipe heating device has the advantages of simple structure, light weight, small volume, high temperature rise speed and good stability; the service life of the stainless steel pipe is long, and the cost is greatly saved; meanwhile, the heating unit 2 is completely positioned in the device body 1, so that electric leakage accidents are not easy to happen; further, the inner tube heating device of integral type can make each position of inner tube be heated evenly, and when the welding, because the inner tube heating device's of integral type power cord is located the one end in the inner tube 100 outside, consequently can move certain distance with device body 1 and weld under the circumstances of not cutting off the power supply, still can maintain corresponding temperature during the welding, has avoided inner tube 100 to retract, has improved welding efficiency.
In this embodiment, the distance between the outer wall of the apparatus body 1 and the inner wall of the inner tube 100 is 2 to 3 mm. Specifically, this distance is 3mm, sets up through 3 mm's distance for 1 outer wall of device body can be close to inner tube 100 inner walls more, very big improvement the heating effect.
In this embodiment, the inner tube heating device further includes a temperature measuring module 4 and a control unit 5, which are disposed on the device body 1 and used for measuring the temperature of the outer wall of the device body 1, wherein the control unit 5 is electrically connected to the heating unit 2 and the temperature measuring module 4, respectively, and is configured to receive a temperature signal output by the temperature measuring module 4 and adjust the heating power of the heating unit 2. The temperature measuring module 4 is a plurality of thermocouples arranged at intervals along the extending direction of the device body 1. Through the arrangement of the control unit 5 and the temperature measuring module 4, the heating power of the heating unit 2 can be effectively controlled, the heating temperature of the inner tube 100 is stable, and the effects of energy conservation and emission reduction are good. The control unit 5 is a temperature control electric cabinet in the prior art, and can set a target heating temperature and adjust the heating power of the heating unit 2 to maintain the target temperature, and the specific structure thereof is not described in detail.
In the present embodiment, the apparatus body 1 has an insertion end 1a located in the inner pipe 100 and a hand-held end 1b located outside the inner pipe 100, and the hand-held end 1b is mounted with a heat-insulating handle 6. Through adiabatic handle 6's setting for this inner tube heating device can be after the heating of an inner tube 100, heats in the device removes to another inner tube 100 fast under the condition of not lowering the temperature of uninterrupted power, very big improvement work efficiency. The insulated handle 6 may be made of any insulating material known in the art, and is selected as required.
An inner tube welding method for a linear chiller based on the inner tube heating apparatus described above for welding an inner tube 100 and a connecting tube 102, the inner tube welding method comprising the steps of:
(1) the device body 1 is inserted through the inner tube 100 and inserted into the connecting tube 102 along the direction from the inner tube 100 to the connecting tube 102, and the distance between the insertion end 1a of the device body 1 and one end of the connecting tube 102 close to the inner tube 100 is 80-120 mm. Here, the distance between the insertion end 1a of the device body 1 and the end of the connection tube 102 close to the inner tube 100 is 100mm, and the distance between the connection tube 102 and the inner tube 100 is 8mm, where 8mm is a pre-stretched pre-tensioned pre-gap 103, so that the inner tube 100 can have a sufficient pre-stretched space through the pre-stretched gap 103.
(2) The control unit 5 is opened, the control unit 5 drives the heating unit 2 to operate, the heating unit 2 transfers heat to the outer wall of the device body 1 through the heat conducting medium 3, the temperature measuring module 4 detects the temperature of the outer wall of the device body 1 and transmits a temperature signal to the control unit 5, the control unit 5 sets the first target temperature range of the outer wall of the device body 1 to be 500 +/-50 ℃, and the heating power of the heating unit 2 is adjusted according to the temperature signal output by the temperature measuring module 4, so that the temperature of the outer wall of the device body 1 can be maintained in the first target temperature range. The temperature measuring module 4 is a thermocouple, the control unit 5 is a temperature control electric cabinet in the prior art, and can set a heating target temperature and adjust the heating power of the heating unit 2 to maintain the target temperature, the specific structure of the temperature measuring module is not described in detail, and the heating unit 2 is an electric heating rod.
(3) The inner tube 100 is heated in a first target temperature range, then extends in a direction close to the connection tube 102 and is in butt joint with the connection tube 102, after the butt joint is completed, the device body 1 is moved in a direction from the connection tube 102 to the inner tube 100, so that the insertion end 1a is moved into the inner tube 100, and the distance between the insertion end 1a and one end of the inner tube 100 close to the connection tube 102 is 150-250 mm. Here, the distance is 200 mm. Through extracting 200 mm's distance with device body 1, reserve sufficient space for the welding, need not the outage, can maintain suitable temperature always, avoided inner tube 100 to retract because of the temperature descends, avoided the reheat, improved welding efficiency. The inner tube 100 is preheated before welding, then is pre-stretched by 8mm and is welded after being butted with the connecting tube 102, so that the phenomenon of thermal extension is avoided.
(4) The butt joint of the inner tube 100 and the connecting tube 102 is welded, and the welding here uses a machine for automatic argon arc welding, the machine is an inner hole wire adding welding machine in the prior art, and the detailed structure is not described. After welding, the device body 1 is moved along the direction from the inner tube 100 to the connecting tube 102, so that the insertion end 1a is positioned in the connecting tube 102, and the distance between the insertion end 1a and one end of the connecting tube 102 close to the inner tube 100 is 80-120 mm. The distance here is 100mm, and after the welding is finished, the apparatus body 1 is inserted into the inner tube 100 again and exceeds the weld by 100mm to perform a hydrogen elimination treatment and a local heat treatment for the weld.
(5) And adjusting the control unit 5, setting a second target temperature range of the outer wall of the device body 1 to be 300 +/-50 ℃ by the control unit 5, adjusting the heating power of the heating unit 2 by the control unit 5 according to the temperature signal output by the temperature measuring module 4, maintaining the temperature of the outer wall of the device body 1 in the second target temperature range, and performing dehydrogenation treatment on the welding part of the inner tube 100 and the connecting tube 102 in the second target temperature range for 0.5-1 h. Here, the duration is 1 h.
(6) And adjusting the control unit 5, setting a third target temperature range of the outer wall of the device body 1 to 670 ℃ +/-20 ℃ by the control unit 5, adjusting the heating power of the heating unit 2 by the control unit 5 according to the temperature signal output by the temperature measurement module 4, maintaining the temperature of the outer wall of the device body 1 in the third target temperature range, and performing local heat treatment on the welding part of the inner tube 100 and the connecting tube 102 for 1.5-2.5 hours. Here, the duration is 8 h.
After the treatment is finished, the apparatus body 1 is pulled out and the apparatus body 1 is inserted into another inner tube to be pre-stretch welded.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (7)
1. An inner tube welding method for a linear chiller including an inner tube (100), an outer tube (101) fitted over the inner tube (100), and a connecting tube (102) for connecting the inner tube (100) and the outer tube (101), the inner tube welding method for welding the inner tube (100) and the connecting tube (102), characterized in that:
the inner tube heating device applied by the inner tube welding method comprises a hollow device body (1), a plurality of heating units (2) arranged in the device body (1), a heat-conducting medium (3) filled in the device body (1) and positioned on the periphery of the plurality of heating units (2), a temperature measurement module (4) and a control unit (5) which are arranged on the device body (1) and used for measuring the temperature of the outer wall of the device body (1), wherein the control unit (5) is electrically connected with the plurality of heating units (2) and the temperature measurement module (4) respectively;
the inner pipe welding method comprises the following steps:
(1) the device body (1) penetrates through the inner pipe (100) along the direction from the inner pipe (100) to the connecting pipe (102) and is inserted into the connecting pipe (102), and the distance between an insertion end (1 a) of the device body (1) and one end, close to the inner pipe (100), of the connecting pipe (102) is 80-120 mm;
(2) the method comprises the following steps that a control unit (5) is started, the control unit (5) drives a heating unit (2) to operate, the heating unit (2) transfers heat to the outer wall of a device body (1) through a heat conducting medium (3), a temperature measuring module (4) detects the temperature of the outer wall of the device body (1) and transmits a temperature signal to the control unit (5), the control unit (5) sets a first target temperature range of the outer wall of the device body (1) to be 500 +/-50 ℃, and adjusts the heating power of the heating unit (2) according to the temperature signal output by the temperature measuring module (4), so that the temperature of the outer wall of the device body (1) can be maintained in the first target temperature range;
(3) the inner pipe (100) is heated in the first target temperature range, extends towards the direction close to the connecting pipe (102) and is in butt joint with the connecting pipe (102), after the butt joint is completed, the device body (1) is moved along the direction from the connecting pipe (102) to the inner pipe (100), the inserting end (1 a) is moved into the inner pipe (100), and the distance between the inserting end (1 a) and one end, close to the connecting pipe (102), of the inner pipe (100) is 150-250 mm;
(4) welding the joint of the inner pipe (100) and the connecting pipe (102), and after welding is finished, moving the device body (1) along the direction from the inner pipe (100) to the connecting pipe (102) to enable the inserting end (1 a) to be located in the connecting pipe (102), wherein the distance between the inserting end (1 a) and one end, close to the inner pipe (100), of the connecting pipe (102) is 80-120 mm;
(5) adjusting the control unit (5), enabling the control unit (5) to set a second target temperature range of the outer wall of the device body (1) to be 300 ℃ +/-50 ℃, enabling the control unit (5) to adjust the heating power of the heating unit (2) according to the temperature signal output by the temperature measurement module (4), enabling the temperature of the outer wall of the device body (1) to be maintained in the second target temperature range, and performing dehydrogenation treatment on the welding position of the inner pipe (100) and the connecting pipe (102) in the second target temperature range for 0.5-1 h;
(6) adjusting the control unit (5), enabling the control unit (5) to set a third target temperature range of the outer wall of the device body (1) to be 670 ℃ +/-20 ℃, and adjusting the heating power of the heating unit (2) according to the temperature signal output by the temperature measurement module (4) by the control unit (5), so that the temperature of the outer wall of the device body (1) can be maintained in the third target temperature range, local heat treatment is carried out on the welding position of the inner tube (100) and the connecting tube (102), and the heating power lasts for 1.5-2.5 hours.
2. The method of claim 1 for welding an inner tube of a linear chiller, wherein: the distance between the outer wall of the device body (1) and the inner wall of the inner pipe (100) is 2-3 mm.
3. The method of claim 1 for welding an inner tube of a linear chiller, wherein: the heating unit (2) is arranged along the extending direction of the device body (1).
4. The method of claim 1 for welding an inner tube of a linear chiller, wherein: the plurality of heating units (2) are uniformly distributed along the circumferential direction of the section of the device body (1) vertical to the extension direction of the inner pipe (100).
5. The method of claim 1 for welding an inner tube of a linear chiller, wherein: the temperature measuring modules (4) are arranged at intervals along the extending direction of the device body (1).
6. The method of claim 1 for welding an inner tube of a linear chiller, wherein: the control unit (5) is used for receiving the temperature signal output by the temperature measuring module (4) and adjusting the heating power of the heating unit (2).
7. The method of claim 1 for welding an inner tube of a linear chiller, wherein: the device body (1) is provided with an insertion end (1 a) positioned in the inner pipe (100) and a handheld end (1 b) positioned outside the inner pipe (100), and the handheld end (1 b) is provided with a heat insulation handle (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910721259.8A CN110449697B (en) | 2019-08-06 | 2019-08-06 | Inner pipe heating device for linear quencher and inner pipe welding method using same |
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| CN201910721259.8A CN110449697B (en) | 2019-08-06 | 2019-08-06 | Inner pipe heating device for linear quencher and inner pipe welding method using same |
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| CN110449697B true CN110449697B (en) | 2021-09-28 |
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| CN201086182Y (en) * | 2007-07-25 | 2008-07-16 | 上海飞恩微电子有限公司 | Spun gold ball bonding clamper of deep-cavity device |
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| CN105397396B (en) * | 2015-12-14 | 2017-12-08 | 茂名重力石化装备股份公司 | Welding method of the inner tube shallow bore hole weldering group of jacket heat-exchanger jacket pipe to device, jacket heat-exchanger and jacket pipe |
| CN105710551B (en) * | 2016-04-20 | 2019-05-03 | 江南造船(集团)有限责任公司 | The welding method of bimetallic tube |
| CN205996471U (en) * | 2016-08-31 | 2017-03-08 | 沈阳汉科半导体材料有限公司 | Bimetallic tube welding machine |
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