CN112775508A - Welding method for hollow workpiece - Google Patents
Welding method for hollow workpiece Download PDFInfo
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- CN112775508A CN112775508A CN201911095074.7A CN201911095074A CN112775508A CN 112775508 A CN112775508 A CN 112775508A CN 201911095074 A CN201911095074 A CN 201911095074A CN 112775508 A CN112775508 A CN 112775508A
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a welding method of a hollow workpiece, which is used for carrying out sealing welding on two workpieces to be welded, wherein at least one workpiece to be welded is a hollow workpiece. The welding method of the hollow workpiece comprises the following steps: continuously filling nitrogen into the hollow workpiece within a preset time length; and aligning the welding positions of the two workpieces to be welded, and brazing the butt joint of the two welding positions. As the nitrogen is continuously filled into the hollow workpiece, the oxygen content in the hollow workpiece is lower, so as to meet the environmental requirement required by brazing, greatly reduce the probability of poor welding such as insufficient welding, broken welding and the like in the welding process of the hollow workpiece, and effectively improve the welding effect of the hollow workpiece during welding.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding method of a hollow workpiece.
Background
With the continuous development of the manufacturing industry, the processing requirements of products are higher and higher, and especially the sealing requirements of welding positions on products with air tightness requirements, such as cooling pipelines in a cooling system, are higher and higher.
However, the hollow workpiece is filled with air because the hollow workpiece has a large cavity. Therefore, in the brazing process, because the internal space of the hollow workpiece is large, air in the hollow workpiece is not easy to exhaust, so that the situation that the oxygen content in the hollow workpiece is too large in the brazing process is caused, and poor welding conditions such as insufficient welding, broken welding and the like can be caused due to the too large oxygen content in the welding position, so that the welding of the hollow workpiece at the welding position is not firm, the sealing performance of the hollow workpiece at the welding position is influenced, and the use of the product is greatly influenced.
Disclosure of Invention
Therefore, it is necessary to provide a welding method for hollow workpieces with good welding effect to solve the problem of poor welding effect of the conventional welding method.
A welding method of hollow workpieces for seal welding two workpieces to be welded, and wherein at least one of the workpieces to be welded is a hollow workpiece, the method comprising the steps of:
continuously filling nitrogen into the hollow workpiece within a preset time length;
and aligning the welding positions of the two workpieces to be welded, and brazing the butt joint of the two welding positions.
In one embodiment, the step of continuously filling nitrogen into the hollow workpiece within the preset time period comprises the following steps:
and filling nitrogen into the hollow workpiece by using an air gun communicated with the nitrogen storage device.
In one embodiment, the preset time is 30 seconds to 90 seconds.
In one embodiment, the step of continuously filling the hollow workpiece with nitrogen gas for the preset time period further comprises the following steps:
continuously filling nitrogen into the hollow workpiece, and detecting the oxygen content in the hollow workpiece in real time in the process of filling the nitrogen;
and determining the preset time required for filling the hollow workpiece with the nitrogen according to the oxygen content.
In one embodiment, the step of continuously filling the hollow workpiece with nitrogen and detecting the oxygen content in the hollow workpiece in real time in the process of filling the hollow workpiece with nitrogen is as follows;
and in the process of filling the nitrogen into the hollow workpiece, detecting the oxygen content in the hollow workpiece in real time by using a micro-oxygen analysis detector.
In one embodiment, the step of determining the preset time required for filling the hollow workpiece with nitrogen according to the oxygen content comprises:
and timing the process from the step of filling the hollow workpiece with nitrogen to the step of keeping the oxygen content in the hollow workpiece less than the preset value so as to obtain the preset duration.
In one embodiment, the step of continuously filling the hollow workpiece with nitrogen gas within the preset time period further comprises the following steps:
carrying out degreasing treatment on the workpiece to be welded;
cleaning the degreased workpiece to be welded;
and drying the cleaned workpiece to be welded.
In one embodiment, the step of continuously filling nitrogen into the hollow workpiece within the preset time period comprises the following steps:
continuously filling nitrogen into the hollow workpiece within the preset time length in the process that the hollow workpiece is conveyed from the drying station to the welding station;
the drying station is used for drying the workpiece to be welded, and the welding station is used for brazing the workpiece to be welded.
In one embodiment, the step of continuously filling nitrogen into the hollow workpiece within the preset time period comprises the following steps:
acquiring the transmission speed of the hollow workpiece from the drying station to the welding workpiece;
acquiring an inflation interval of the hollow workpiece according to the preset time length and the transmission speed;
and continuously filling nitrogen into the hollow workpiece in the gas filling interval.
In one embodiment, after aligning the welding positions of the two workpieces to be welded, and brazing the joint of the two welding positions comprises:
aligning the welding positions of the two workpieces to be welded, and placing brazing filler metal at the butt joint of the welding positions;
spraying protective gas to the welding positions of the two workpieces to be welded;
and heating the butt joint of the two welding positions until the brazing filler metal is melted and flows into a gap between the two welding positions to be solidified.
According to the welding method of the hollow workpiece, at least one of the two workpieces to be welded is a hollow workpiece, nitrogen is continuously filled into the hollow workpiece within a preset time period to discharge air in the hollow workpiece, so that the oxygen content in the hollow workpiece is low, and then the two workpieces to be welded are brazed. As the nitrogen is continuously filled into the hollow workpiece, the oxygen content in the hollow workpiece is lower, so as to meet the environmental requirement required by brazing, greatly reduce the probability of poor welding such as insufficient welding, broken welding and the like in the welding process of the hollow workpiece, and effectively improve the welding effect of the hollow workpiece during welding.
Drawings
FIG. 1 is a flow chart of a method of welding a hollow workpiece according to one embodiment of the present invention;
fig. 2 is a flowchart of step S20 of the welding method for the hollow workpiece shown in fig. 1;
FIG. 3 is a flow chart of a method of welding a hollow workpiece according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method of welding a hollow workpiece according to yet another embodiment of the present invention;
fig. 5 is a flowchart of step S10 of the welding method for the hollow workpiece shown in fig. 1.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a welding method for a hollow workpiece according to a preferred embodiment of the present invention is used for performing a sealing welding on two workpieces to be welded, wherein at least one of the workpieces to be welded is a hollow workpiece. Specifically, the welding method of the hollow workpiece can be used for sealing welding between two hollow workpieces, and can also be used for sealing welding between one hollow workpiece and one solid workpiece. The purpose of sealing and welding the two workpieces to be welded is to ensure that the hollow workpiece has better sealing performance at the welding position while connecting and fixing the two workpieces to be welded. The above method includes steps S10 to S20:
and step S10, continuously filling nitrogen into the hollow workpiece within a preset time.
Wherein, the hollow workpiece is a pipe fitting, a box body with a cavity, a shell and other structures. Specifically, the hollow workpiece is provided with a cavity with two open ends, nitrogen is filled into the cavity of the hollow workpiece through one of the open ends, and the gas in the cavity is discharged from the other open end, so that the purpose of discharging the air in the hollow workpiece is achieved, and the oxygen content in the hollow workpiece is effectively reduced.
In the present embodiment, the preset time period is 30 seconds to 90 seconds. In the process of filling nitrogen into the hollow workpiece, if the inflation time is too short, the oxygen content in the hollow workpiece is too high, and the brazing environment requirement cannot be met; if the inflation time is too long, nitrogen is wasted, and the welding cost is increased. Therefore, the preset time is set to be 30-90 seconds, so that the welding cost is effectively controlled while the oxygen content in the hollow workpiece meets the requirement.
In this embodiment, step S10 is: and filling nitrogen into the hollow workpiece by using an air gun communicated with the nitrogen storage device.
Specifically, the air gun is communicated with the nitrogen storage device through a hose. The arrangement of the hose enables the air gun to be used more freely, and further enables the operation of filling nitrogen into the hollow workpiece to be more convenient. Thus, the length of the hose can be determined according to the furthest distance of use of the airgun. In the actual use process, an operator can hold the air gun by hand to perform manual nitrogen filling operation on the hollow workpiece, and can clamp the air gun on a manipulator or a fixing frame of an automatic production line to perform automatic nitrogen filling operation on the hollow workpiece. Specifically, in this embodiment, the operator holds the air gun by hand to fill the hollow workpiece with nitrogen.
And step S20, aligning the welding positions of the two workpieces to be welded, and brazing the butt joint of the two welding positions.
Specifically, the welding positions of two workpieces to be welded may be automatically brazed by using a brazing machine, or the welding positions may be brazed by an operator holding a welding tool such as a welding gun. In the automatic welding process, in order to ensure the safety and the welding effect in the welding process, two welding workpieces are usually placed in a closed space for brazing.
Referring to fig. 2, in the present embodiment, the step S20 includes steps S201 to S202:
step S201, aligning the welding positions of two workpieces to be welded, and placing brazing filler metal at the butt joint of the two welding positions.
Specifically, after the welding positions of two workpieces to be welded are aligned, a welding gap exists at the joint of the two workpieces to be welded, and the brazing filler metal is placed at the welding gap between the two workpieces to be welded. The filler metal is a filler metal that forms a brazed joint during brazing.
Furthermore, after the welding positions of the two workpieces to be welded are aligned, the two workpieces to be welded are positioned in a binding mode and the like, so that the situation that the workpieces to be welded move in the welding process to cause poor welding or welding failure is avoided.
And step S202, spraying protective gas to the welding positions of the two stations to be welded.
Specifically, protective gas is sprayed to the welding positions of two workpieces to be welded by using a protective gas nozzle. The protective gas may be inert gas, rare gas, etc., specifically argon. The protective gas is used for protecting the welding position of the workpiece to be welded, so that the welding position is uniformly heated, and the workpiece to be welded is prevented from being oxidized at high temperature in the welding process, so that the use performance and the welding performance of the workpiece to be welded are influenced.
And step S203, heating the butt joint of the two welding positions until the brazing filler metal flows into a gap between the two welding positions to be solidified after being melted.
Specifically, the laser beam, the combustible gas or the induced current is used as a heat source to heat the brazing filler metal at the welding position of two workpieces to be welded until the brazing filler metal is melted, so as to complete the brazing work. Because the protective gas is continuously sprayed to the welding positions of the two workpieces to be welded in the brazing process, the welding positions are heated more uniformly, the probability of chemical and physical changes of the brazing filler metal and the workpieces to be welded in the brazing process can be reduced, and the welding effect is further improved.
Before brazing, nitrogen is continuously filled into the hollow workpiece to exhaust air in the hollow workpiece, so that the oxygen content in the hollow workpiece is low, the environmental requirement required by brazing is met, the probability of poor welding such as cold joint and broken joint in the process of welding the hollow workpiece is greatly reduced, the welding effect of the hollow workpiece during welding is effectively improved, and the sealing performance of the welded part of the hollow workpiece is high.
Referring to fig. 3, the preset time required for filling nitrogen is different because the sizes of the cavities in the hollow workpieces with different specifications are different. In order to enable the hollow workpieces with different specifications to meet the brazing environmental requirements and facilitate the subsequent processing of all the hollow workpieces with the specification, one hollow workpiece with each specification needs to be extracted, and the detection for a preset time is performed before step S10. In this embodiment, step S10 is preceded by steps S001 to S002:
and S001, continuously filling nitrogen into the hollow workpiece, and detecting the oxygen content in the hollow workpiece in real time in the process of filling the nitrogen.
Specifically, in the process of filling nitrogen, the oxygen content in the hollow workpiece is monitored in real time by using a micro-oxygen analysis detector.
Because the nitrogen gas flushed into the hollow workpiece can lead to the arrangement of the air in the hollow workpiece, the oxygen content in the hollow workpiece is lower and lower along with the prolonging of the nitrogen charging time. In the actual use process, the micro-oxygen analysis detector is connected into the hollow workpiece, and the numerical value of the oxygen content in the hollow workpiece can be directly read on the micro-oxygen analysis detector in the nitrogen filling process, so that the data acquisition of the oxygen content in the hollow workpiece is more convenient.
And step S002, determining the preset time length required for filling the hollow workpiece with the nitrogen according to the oxygen content.
In this embodiment, the process from the start of filling the hollow workpiece with nitrogen gas to the time when the oxygen content in the hollow workpiece is less than the preset value is timed to obtain the preset duration. The preset value is a standard value of oxygen content required by brazing, and when the oxygen content in the hollow workpiece is lower than the preset value, the probability of poor welding such as cold joint and broken joint in the welding process can be reduced, so that the welding effect of the hollow workpiece can be better.
Specifically, in the process of filling nitrogen, a timing tool such as a timer is used for timing the process from the step of filling nitrogen into the hollow workpiece to the step of keeping the oxygen content in the hollow workpiece lower than the preset value. And when the oxygen content in the hollow workpiece is detected to be lower than the preset value, stopping the work of filling the nitrogen, obtaining the time length from the start of filling the nitrogen into the hollow workpiece to the stop of filling the nitrogen into the hollow workpiece, and determining the time length of filling the nitrogen to be the preset time length.
It should be noted that, when products of several similar specifications use the same preset time length, the preset time length may be determined as the maximum inflation time length obtained in the detection process.
Thus, the steps S001 to S002 are mainly used to confirm the preset time duration of the new product. That is to say, the preset time length of the new product requiring nitrogen filling is unknown before the preset time length detection by an operator, and the preset time length of the product with the same specification is not recorded before the preset time length detection, so that the preset time length of the new product needs to be detected in order to ensure the welding effect of the new product, thereby facilitating the subsequent processing of the products with the same specification, and ensuring the production efficiency and the welding effect of the products with the same specification.
Referring to fig. 4, in the present embodiment, steps S010 to S030 are further included before step S10.
And step S010, degreasing the workpiece to be welded.
The oil stains on the surface of the workpiece to be welded can be removed by using a surfactant and the like. Specifically, the surfactant is sprayed on the surface of the workpiece to be welded, so that oil stains on the surface of the workpiece to be welded are dissolved by the surfactant and are not adhered to the surface of the workpiece to be welded.
And step S020, cleaning the degreased workpiece to be welded. Specifically, the workpiece to be welded is sprayed, so that impurities on the surface of the workpiece to be welded and a mixture of a surfactant and oil stains are washed away by water, and the purpose of cleaning the workpiece to be welded is achieved.
And S030, drying the cleaned workpiece to be welded. The cleaned workpiece to be welded is dried by the drying equipment to remove the moisture remained on the surface of the workpiece to be welded, so that the surface of the workpiece to be welded is relatively clean, factors influencing the subsequent brazing effect are reduced, and the welding effect is further improved.
Further, in this embodiment, step S10 is: and continuously filling nitrogen into the hollow workpiece within a preset time length in the process of conveying the hollow workpiece from the drying station to the welding station. The drying station is used for drying the workpiece to be welded, and the welding station is used for brazing the workpiece to be welded.
Therefore, the operation of injecting the nitrogen into the hollow workpiece is carried out in the process of conveying the hollow workpiece from the drying station to the welding station. Specifically, a conveying device such as a crawler machine is used for conveying the hollow workpiece from the drying station to the welding workpiece. Of course, all the processing of the hollow workpiece can be carried out on one production line, the drying station, the transmission device and the welding station are all positioned on the production line, and the drying device and the brazing device are respectively arranged on the drying station and the welding station.
Referring to fig. 5, in the present embodiment, the step S10 includes steps S101 to S103:
s101, acquiring the transmission speed of the hollow workpiece from a drying station to a welding station;
specifically, the conveying speed of a conveying device for conveying the hollow workpiece, such as the running speed of a crawler in a crawler machine, is acquired.
S102, obtaining an inflation interval of the hollow workpiece according to the transmission speed and the preset duration;
specifically, the length of the inflation interval is equal to the transmission speed × the preset time period. When the hollow workpiece is conveyed by the conveying device, a starting mark and an ending mark can be respectively marked on the conveying path of the conveying device, and the distance between the starting mark and the ending mark is the length of the inflation interval. The start mark and the end mark may be graduation marks, or may be simple scribed lines, or marks in other forms (e.g., dots, border lines, etc. on the transfer device). Specifically, in the present embodiment, the start mark and the end mark are both scale marks.
And S103, continuously filling nitrogen into the hollow workpiece in the gas filling interval.
In the actual operation process, an operator only needs to wait for the hollow workpiece to be transmitted to the starting mark position to start to fill the hollow workpiece with nitrogen, and when the hollow workpiece is transmitted to the ending mark position, the operation of filling the hollow workpiece with nitrogen can be stopped, so that the operation of filling the hollow workpiece with nitrogen is simpler, the condition that the welding effect is poor due to the fact that the operator forgets to time or times too short in the nitrogen filling process is avoided, and the welding effect of the hollow workpiece is effectively guaranteed.
According to the welding method of the hollow workpiece, at least one of the two workpieces to be welded is a hollow workpiece, nitrogen is continuously filled into the hollow workpiece within a preset time period to discharge air in the hollow workpiece, so that the oxygen content in the hollow workpiece is low, and then the two workpieces to be welded are brazed. As the nitrogen is continuously filled into the hollow workpiece, the oxygen content in the hollow workpiece is lower, so as to meet the environmental requirement required by brazing, greatly reduce the probability of poor welding such as insufficient welding, broken welding and the like in the welding process of the hollow workpiece, and effectively improve the welding effect of the hollow workpiece during welding.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A welding method of hollow workpieces for seal welding two workpieces to be welded, at least one of which is a hollow workpiece, characterized in that the method comprises the steps of:
continuously filling nitrogen into the hollow workpiece within a preset time length;
and aligning the welding positions of the two workpieces to be welded, and brazing the butt joint of the two welding positions.
2. The method for welding hollow workpieces according to claim 1, wherein the step of continuously filling the hollow workpieces with nitrogen gas for a preset period of time comprises the steps of:
and filling nitrogen into the hollow workpiece by using an air gun communicated with the nitrogen storage device.
3. The method for welding hollow workpieces according to claim 1, wherein the preset time is 30 to 90 seconds.
4. The method for welding hollow workpieces according to claim 1, wherein the step of continuously filling the hollow workpieces with nitrogen gas for a preset period of time further comprises the steps of:
continuously filling nitrogen into the hollow workpiece, and detecting the oxygen content in the hollow workpiece in real time in the process of filling the nitrogen;
and determining the preset time required for filling the hollow workpiece with the nitrogen according to the oxygen content.
5. The welding method of the hollow workpiece according to claim 4, characterized in that the steps of continuously charging nitrogen gas into the hollow workpiece and detecting the oxygen content in the hollow workpiece in real time in the process of charging the nitrogen gas are as follows;
and in the process of filling the nitrogen into the hollow workpiece, detecting the oxygen content in the hollow workpiece in real time by using a micro-oxygen analysis detector.
6. The method for welding hollow workpieces according to claim 4, wherein the step of determining the preset time period required for filling the hollow workpieces with nitrogen gas according to the oxygen content comprises:
and timing the process from the step of filling the hollow workpiece with nitrogen to the step of keeping the oxygen content in the hollow workpiece less than the preset value so as to obtain the preset duration.
7. The method for welding hollow workpieces according to claim 1, wherein the step of continuously filling the hollow workpieces with nitrogen gas for a preset time period further comprises the steps of:
carrying out degreasing treatment on the workpiece to be welded;
cleaning the degreased workpiece to be welded;
and drying the cleaned workpiece to be welded.
8. The method for welding the hollow workpieces according to claim 7, wherein the step of continuously filling the hollow workpieces with nitrogen gas for a preset time period comprises the following steps:
continuously filling nitrogen into the hollow workpiece within the preset time length in the process that the hollow workpiece is conveyed from the drying station to the welding station;
the drying station is used for drying the workpiece to be welded, and the welding station is used for brazing the workpiece to be welded.
9. The method for welding the hollow workpiece according to claim 8, wherein the step of continuously filling the hollow workpiece with nitrogen gas for a preset time period comprises the steps of:
acquiring the transmission speed of the hollow workpiece from the drying station to the welding workpiece;
acquiring an inflation interval of the hollow workpiece according to the preset time length and the transmission speed;
and continuously filling nitrogen into the hollow workpiece in the gas filling interval.
10. The welding method of the hollow workpieces according to claim 1, wherein the step of aligning the welding positions of the two workpieces to be welded and brazing the joint of the two welding positions comprises:
aligning the welding positions of the two workpieces to be welded, and placing brazing filler metal at the butt joint of the welding positions;
spraying protective gas to the welding positions of the two workpieces to be welded;
and heating the butt joint of the two welding positions until the brazing filler metal is melted and flows into a gap between the two welding positions to be solidified.
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| CN201911095074.7A CN112775508A (en) | 2019-11-11 | 2019-11-11 | Welding method for hollow workpiece |
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| CN201911095074.7A CN112775508A (en) | 2019-11-11 | 2019-11-11 | Welding method for hollow workpiece |
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| CN102357703A (en) * | 2011-09-22 | 2012-02-22 | 李择尊 | Welding method of copper pipes |
| CN102642065A (en) * | 2012-05-16 | 2012-08-22 | 力创(台山)电子科技有限公司 | Process for welding two devices for manufacturing copper-aluminum composite tube and welding ring |
| WO2013008975A1 (en) * | 2011-07-08 | 2013-01-17 | 제이엔케이히터(주) | Nitrogen gas purge kit for a brazing apparatus for a steam condensing heat transfer pipe for a generator, and brazing method using same for a steam condensing heat transfer pipe for a generator |
| CN106077907A (en) * | 2016-06-17 | 2016-11-09 | 合肥卡诺汽车空调有限公司 | A kind of refrigeration pipe part welding procedure |
| US20180133845A1 (en) * | 2015-05-22 | 2018-05-17 | Uacj Corporation | Method of manufacturing an aluminum structure |
| CN108188525A (en) * | 2018-03-16 | 2018-06-22 | 昆山联昌天成金属有限公司 | The Horizontal nitrogen protection soldering oven and welding method of a kind of honeycomb sheet metal forming |
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2019
- 2019-11-11 CN CN201911095074.7A patent/CN112775508A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5096110A (en) * | 1990-12-17 | 1992-03-17 | Ford Motor Company | Control system for vacuum brazing process |
| WO2013008975A1 (en) * | 2011-07-08 | 2013-01-17 | 제이엔케이히터(주) | Nitrogen gas purge kit for a brazing apparatus for a steam condensing heat transfer pipe for a generator, and brazing method using same for a steam condensing heat transfer pipe for a generator |
| CN102357703A (en) * | 2011-09-22 | 2012-02-22 | 李择尊 | Welding method of copper pipes |
| CN102642065A (en) * | 2012-05-16 | 2012-08-22 | 力创(台山)电子科技有限公司 | Process for welding two devices for manufacturing copper-aluminum composite tube and welding ring |
| US20180133845A1 (en) * | 2015-05-22 | 2018-05-17 | Uacj Corporation | Method of manufacturing an aluminum structure |
| CN106077907A (en) * | 2016-06-17 | 2016-11-09 | 合肥卡诺汽车空调有限公司 | A kind of refrigeration pipe part welding procedure |
| CN108188525A (en) * | 2018-03-16 | 2018-06-22 | 昆山联昌天成金属有限公司 | The Horizontal nitrogen protection soldering oven and welding method of a kind of honeycomb sheet metal forming |
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Application publication date: 20210511 |
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