CN114515942A - Traceless welding process for internal thread copper pipe - Google Patents
Traceless welding process for internal thread copper pipe Download PDFInfo
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- CN114515942A CN114515942A CN202210350496.XA CN202210350496A CN114515942A CN 114515942 A CN114515942 A CN 114515942A CN 202210350496 A CN202210350496 A CN 202210350496A CN 114515942 A CN114515942 A CN 114515942A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 214
- 239000010949 copper Substances 0.000 title claims abstract description 214
- 238000003466 welding Methods 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004140 cleaning Methods 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 230000035882 stress Effects 0.000 claims description 47
- 238000001816 cooling Methods 0.000 claims description 29
- 238000000227 grinding Methods 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 28
- 238000003801 milling Methods 0.000 claims description 25
- 239000000523 sample Substances 0.000 claims description 21
- 239000012535 impurity Substances 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 abstract description 12
- 238000007906 compression Methods 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002344 surface layer Substances 0.000 abstract description 7
- 238000004321 preservation Methods 0.000 description 10
- 238000005422 blasting Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 230000006378 damage Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000009210 therapy by ultrasound Methods 0.000 description 4
- 238000005493 welding type Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000003116 impacting effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a traceless welding process for an internal thread copper pipe, and particularly relates to the technical field of internal thread copper pipes, which comprises the following steps: blanking, namely cutting a copper pipe with a specified length; cleaning, cleaning the obtained copper pipe: and preheating the copper pipe, drying the cleaned copper pipe and carrying out preheating treatment. When the copper pipe is preheated in the welding process, the welding stress is reduced, meanwhile, an ultrasonic stress removing mode is adopted, high-power energy is utilized to impact the surface of the metal in a high-frequency mode through an impact tool, the surface layer of the copper pipe generates larger compression plastic deformation under the action of high-frequency, high-efficiency and focused high energy, meanwhile, the ultrasonic impact wave changes the original stress field, the compression stress with a certain numerical value is generated, the impacted part is strengthened, the temperature is slowly reduced, the stress generation at the welding position of the copper pipe is reduced, meanwhile, the stress can be treated to a larger degree through the subsequent ultrasonic stress removing mode, and the performance and the service life of the welded copper pipe are ensured to a certain degree.
Description
Technical Field
The invention relates to the technical field of internal thread copper pipes, in particular to a traceless welding process for an internal thread copper pipe.
Background
The internal thread copper pipe needs to be welded frequently due to use requirements to complete size adjustment of the internal thread copper pipe, obvious welding seams and welding traces do not exist on the inner surface and the outer surface of the internal thread copper pipe, welding operation is carried out in the existing welding mode, the welding process possibly has the condition of large stress concentration due to the fact that the temperature of the copper pipe is changed too fast in the welding process, meanwhile, obvious tensile stress appears after welding and cooling, the performance of the welding position of a follow-up copper pipe can be influenced, cracks and even gaps appear on the copper pipe, the service life of the copper pipe is influenced, and therefore the problem is solved by a seamless welding process of the internal thread copper pipe.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a traceless welding process for an internal thread copper pipe, and the technical problems to be solved by the invention are as follows: the welding means is mostly simple to perform welding operation, the welding process may have a large stress concentration condition due to the too fast temperature change of the copper pipe welding process, and meanwhile, the welding cooling process has a relatively obvious tensile stress, which may affect the performance of the subsequent copper pipe welding position, lead to the copper pipe to have cracks or even gaps, and affect the service life of the copper pipe.
In order to achieve the purpose, the invention provides the following technical scheme: a traceless welding process for an internal thread copper pipe comprises the following steps:
(1) blanking, namely cutting a copper pipe with a specified length;
(2) cleaning, cleaning the obtained copper pipe:
(3) preheating a copper pipe, drying the cleaned copper pipe and carrying out preheating treatment; the width of the welding seam is measured before preheating, the preheating range of the surface of the copper pipe is controlled to be more than or equal to three times of the wall thickness of the copper pipe on the premise of being based on the center of the welding seam, and meanwhile, heat preservation is carried out on the surface of the copper pipe except the preheating position.
(4) High-frequency welding, namely, controlling the input of high-frequency current and voltage by adopting a high-frequency induction welding power supply to realize the welding between the connecting surfaces of the two copper pipes;
(5) cooling and deslagging, namely grinding and cleaning welding slag at the position of the welding seam by adopting polishing equipment;
(6) stress treatment, namely performing stress treatment on the welding seam position by adopting ultrasonic waves;
(7) thread milling, namely performing thread milling on the welded copper pipe in a milling mode to form an internal thread copper pipe;
(8) and (4) ultrasonic flaw detection, namely performing ultrasonic flaw detection on the surface of the copper pipe in an ultrasonic mode and removing unqualified welded copper pipes.
As a further scheme of the invention: and (2) cleaning the copper pipe, namely removing oxides, impurities and oil stains on the surface of the copper pipe, and grinding burrs on the cut surface.
The method comprises the steps of adopting a shot blasting machine, throwing steel shots out of the shot blasting machine by utilizing centrifugal force to impact the surfaces of copper pipes, carrying out knocking grinding on oxides on the surfaces of the copper pipes, removing oxide skins and corrosion, then putting the copper pipes without the oxide skins and the corrosion into a cleaning box, putting alkali liquor into the cleaning box, immersing the copper pipes, realizing oil removal, taking out the copper pipes after the oil removal is finished, drying the copper pipes by adopting an air heater, and polishing burrs on the section of the copper pipes by adopting grinding equipment until the surfaces of the copper pipes are smooth.
As a further scheme of the invention: and (4) high-frequency welding comprises the steps of welding a copper pipe, cleaning and preheating a welding rod, and an alkaline welding rod is adopted in the welding process.
The welding rod is cleaned before being used, so that residual impurities are avoided, the welding rod is preheated simultaneously, the wet condition is avoided, different types of welding rods are stored respectively, and after being preheated and dried, the welding rod is placed in a heat preservation box at the temperature of 100-150 ℃ to keep a closed environment.
As a further scheme of the invention: and (5) cooling and deslagging, namely cooling the welded copper pipe by adopting a natural cooling mode, and grinding the welding seam positions inside and outside the copper pipe by adopting grinding equipment after cooling is finished until no obvious bulge is formed at the welding seam position.
As a further scheme of the invention: and (4) performing stress treatment in the step (6), and performing ultrasonic impact treatment on the position of the welding line on the surface of the copper pipe by adopting an HTUIT-20 type domestic ultrasonic aging instrument.
In the ultrasonic treatment process, the working current of the ultrasonic aging instrument is 1.2-1.5A, the vibration frequency is kept at 10KHz, the impact speed is 100mm/min, the three times of reciprocating impact are carried out, when the impact wave impacts a welding seam, high-power energy is utilized to impact the metal surface by an impact tool in a high-frequency mode, under the action of high-frequency, high-efficiency and focused large energy, the surface layer of the copper pipe generates large compression plastic deformation, and meanwhile, the ultrasonic impact wave changes the original stress field, generates compressive stress with a certain numerical value and strengthens the impacted part.
As a further scheme of the invention: and (4) milling the threads, namely, machining the threads by adopting a three-axis linkage machine tool, wherein the cutter is a hard alloy integral three-tooth thread milling cutter, the rotating speed of the cutter is 3000r/min, and the feeding amount is 2500 mm/min.
As a further scheme of the invention: and (8) carrying out ultrasonic flaw detection, wherein a phased array probe is adopted to carry out surface flaw detection operation on the copper pipe.
The ultrasonic flaw detection comprises the following steps:
selecting a proper phased array probe according to the diameter and the wall thickness of the copper pipe, and connecting the phased array probe with a phased array detector;
controlling a phased array probe to move along the axial direction on the surface of the copper pipe and simultaneously performing rotary scanning;
acquiring scanning images of all cross-section positions of the copper pipe, and acquiring a scanning result of the whole copper pipe according to the copper pipe data and the scanning data;
analyzing and judging the damage or abnormality of the copper pipe.
The invention has the beneficial effects that:
1. the invention can facilitate the subsequent welding process to be carried out smoothly when the copper pipe is preheated in the welding process, and simultaneously, after the welding is finished, the cooling speed of the welded copper pipe can be reduced due to the arranged heat preservation means, the welding stress is reduced, meanwhile, an ultrasonic stress removing mode is adopted, high-power energy is impacted on the metal surface by an impact tool in a high-frequency mode, the surface layer of the copper pipe generates larger compression plastic deformation under the action of high-frequency, high-efficiency and focused large energy, meanwhile, the ultrasonic impact wave changes the original stress field, generates a certain numerical value of compressive stress, strengthens the impacted part, slowly reduces the temperature, reduces the generation of the stress at the welding position of the copper pipe, simultaneously, and the subsequent ultrasonic stress removing mode can treat the stress to a larger degree, and ensures the performance and the service life of the welded copper pipe to a certain degree;
2. the welding rod adopted by the invention is an alkaline welding rod, the surface of the welding rod is cleaned and preheated before the welding rod is used, the preheating of the welding rod can dry the welding rod, the probability of air holes generated in the subsequent welding process is reduced, meanwhile, the alkaline welding rod is adopted, the generation of hydrogen is reduced in the welding process, the metallicity of a welding seam is improved, the hydrogen-induced cracks are reduced to a certain extent, the welding material is cleaned before the welding, the influence of oxides or impurities on the welding is avoided, and the probability of slag inclusion in the welding process is reduced;
3. the invention adopts ultrasonic flaw detection to detect and detect the finished copper pipe, the phased array probe is connected with the phased array detector for use, and the phased array probe is controlled to axially move and rotate on the surface of the copper pipe, so that the multi-angle detection and scanning of each section of the copper pipe are realized, after scanning images of different angles of each section position of the copper pipe are obtained, a corresponding three-dimensional scanning image of the copper pipe can be obtained, the scanning and detecting result of the copper pipe can be judged more intuitively, and the damage and the defect in the copper pipe can be conveniently judged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a traceless welding process for an internal thread copper pipe comprises the following steps:
(1) blanking, namely cutting a copper pipe with a specified length;
(2) cleaning, cleaning the obtained copper pipe:
(3) preheating a copper pipe, drying the cleaned copper pipe and carrying out preheating treatment; the width of the welding seam is measured before preheating, the preheating range of the surface of the copper pipe is controlled to be more than or equal to three times of the wall thickness of the copper pipe on the premise of being based on the center of the welding seam, and meanwhile, heat preservation is carried out on the surface of the copper pipe except the preheating position.
(4) High-frequency welding, namely, controlling the input of high-frequency current and voltage by adopting a high-frequency induction welding power supply to realize the welding between the connecting surfaces of the two copper pipes;
(5) cooling and deslagging, namely grinding and cleaning welding slag at the position of the welding seam by adopting polishing equipment;
(6) stress treatment, namely performing stress treatment on the welding seam position by adopting ultrasonic waves;
(7) thread milling, namely performing thread milling on the welded copper pipe in a milling mode to form an internal thread copper pipe;
(8) and (4) ultrasonic flaw detection, namely performing ultrasonic flaw detection on the surface of the copper pipe in an ultrasonic mode and removing unqualified welded copper pipes.
And (2) cleaning the copper pipe, namely removing oxides, impurities and oil stains on the surface of the copper pipe, and grinding burrs on the cut surface.
The method comprises the steps of adopting a shot blasting machine, throwing steel shots out of the shot blasting machine by utilizing centrifugal force to impact the surfaces of copper pipes, carrying out knocking grinding on oxides on the surfaces of the copper pipes to remove oxide skins and corrosion, then putting the copper pipes without the oxide skins and the corrosion into a cleaning box, putting alkali liquor into the cleaning box, immersing the copper pipes to remove oil, taking out the copper pipes after the oil removal is finished, drying the copper pipes by adopting a hot air blower, and polishing burrs on the section of the copper pipes by adopting grinding equipment until the surfaces of the copper pipes are smooth.
And (4) welding the copper pipe by high frequency welding, cleaning and preheating a welding rod, wherein the welding process adopts an alkaline welding rod.
The welding rod is cleaned before being used, so that residual impurities are avoided, the welding rod is preheated simultaneously, the wet condition is avoided, different types of welding rods are stored respectively, and after being preheated and dried, the welding rod is placed in a heat preservation box at the temperature of 100-150 ℃ to keep a closed environment.
And (5) cooling and deslagging, namely cooling the welded copper pipe by adopting a natural cooling mode, grinding the positions of the welding seam inside and outside the copper pipe by adopting grinding equipment after cooling is finished, and grinding until no obvious protrusion exists at the welding seam.
And (6) performing stress treatment, namely performing ultrasonic impact treatment on the welding seam position on the surface of the copper pipe by adopting an HTUIT-20 type domestic ultrasonic aging instrument.
In the ultrasonic treatment process, the working current of the ultrasonic aging instrument is 1.2-1.5A, the vibration frequency is kept at 20KHz, the impact speed is 100mm/min, the ultrasonic waves impact three times in a reciprocating manner, and impact tools impact the surface of the metal at high frequency while impacting welding seams, so that the surface layer of the copper pipe generates larger compression plastic deformation under the action of high-frequency, high-efficiency and focused large energy, and meanwhile, the ultrasonic impact waves change the original stress field to generate compression stress with a certain numerical value, convert partial tensile stress into compression stress and strengthen the impacted part.
And (7) thread milling, namely performing thread machining by adopting a three-axis linkage machine tool, wherein the cutter is a hard alloy integral three-tooth thread milling cutter, the rotating speed of the cutter is S3000 r/min, and the feed amount is 2500 mm/min.
And (8) carrying out ultrasonic flaw detection, namely carrying out surface flaw detection on the copper pipe by adopting a phased array probe.
The ultrasonic flaw detection comprises the following steps:
selecting a proper phased array probe according to the diameter and the wall thickness of the copper pipe, and connecting the phased array probe with a phased array detector;
controlling the phased array probe to move along the axial direction on the surface of the copper pipe and simultaneously performing rotary scanning;
acquiring scanning images of all cross-section positions of the copper pipe, and obtaining the overall scanning result of the copper pipe according to the copper pipe data and the scanning data;
analyzing and judging the damage or abnormality of the copper pipe.
Example 2:
a traceless welding process for an internal thread copper pipe comprises the following steps:
(1) blanking, namely cutting a copper pipe with a specified length;
(2) cleaning, cleaning the obtained copper pipe:
(3) preheating a copper pipe, drying the cleaned copper pipe and carrying out preheating treatment; the width of the welding seam is measured before preheating, the preheating range of the surface of the copper pipe is controlled to be more than or equal to three times of the wall thickness of the copper pipe on the premise of being based on the center of the welding seam, and meanwhile, heat preservation is carried out on the surface of the copper pipe except the preheating position.
(4) High-frequency welding, namely, controlling the input of high-frequency current and voltage by adopting a high-frequency induction welding power supply to realize the welding between the connecting surfaces of the two copper pipes;
(5) cooling and deslagging, namely grinding and cleaning welding slag at the position of the welding seam by adopting polishing equipment;
(6) stress treatment, namely performing stress treatment on the welding seam position by adopting ultrasonic waves;
(7) thread milling, namely performing thread milling on the welded copper pipe in a milling mode to form an internal thread copper pipe;
(8) and (4) ultrasonic flaw detection, namely performing ultrasonic flaw detection on the surface of the copper pipe in an ultrasonic mode and removing unqualified welded copper pipes.
And (2) cleaning the copper pipe, namely removing oxides, impurities and oil stains on the surface of the copper pipe, and grinding burrs on the cut surface.
The method comprises the steps of adopting a shot blasting machine, throwing steel shots out of the shot blasting machine by utilizing centrifugal force to impact the surfaces of copper pipes, carrying out knocking grinding on oxides on the surfaces of the copper pipes to remove oxide skins and corrosion, then putting the copper pipes without the oxide skins and the corrosion into a cleaning box, putting alkali liquor into the cleaning box, immersing the copper pipes to remove oil, taking out the copper pipes after the oil removal is finished, drying the copper pipes by adopting a hot air blower, and polishing burrs on the section of the copper pipes by adopting grinding equipment until the surfaces of the copper pipes are smooth.
And (4) welding the copper pipe by high frequency welding, cleaning and preheating a welding rod, wherein the welding process adopts an alkaline welding rod.
The welding rod is cleaned before being used, so that residual impurities are avoided, the welding rod is preheated simultaneously, the wet condition is avoided, different types of welding rods are stored respectively, and after being preheated and dried, the welding rod is placed in a heat preservation box at the temperature of 100-150 ℃ to keep a closed environment.
And (5) cooling and deslagging, namely cooling the welded copper pipe by adopting a natural cooling mode, and grinding the welding seam position inside and outside the copper pipe by adopting grinding equipment after cooling is finished until no obvious bulge is formed at the welding seam position.
And (6) performing stress treatment, namely performing ultrasonic impact treatment on the welding seam position on the surface of the copper pipe by adopting an HTUIT-20 type domestic ultrasonic aging instrument.
In the ultrasonic treatment process, the working current of the ultrasonic aging instrument is 1.2-1.5A, the vibration frequency is kept at 20KHz, the impact speed is 100mm/min, the ultrasonic waves impact three times in a reciprocating manner, and impact tools impact the surface of the metal at high frequency while impacting welding seams, so that the surface layer of the copper pipe generates larger compression plastic deformation under the action of high-frequency, high-efficiency and focused large energy, and meanwhile, the ultrasonic impact waves change the original stress field to generate compression stress with a certain numerical value, convert partial tensile stress into compression stress and strengthen the impacted part.
And (7) thread milling, namely performing thread machining by adopting a three-axis linkage machine tool, wherein the cutter is a hard alloy integral three-tooth thread milling cutter, the rotating speed of the cutter is S3000 r/min, and the feed amount is 2500 mm/min.
And (8) carrying out ultrasonic flaw detection, namely carrying out surface flaw detection on the copper pipe by adopting a phased array probe.
The ultrasonic flaw detection comprises the following steps:
selecting a proper phased array probe according to the diameter and the wall thickness of the copper pipe, and connecting the phased array probe with a phased array detector;
controlling a phased array probe to move along the axial direction on the surface of the copper pipe and simultaneously performing rotary scanning;
acquiring scanning images of all cross-section positions of the copper pipe, and obtaining the overall scanning result of the copper pipe according to the copper pipe data and the scanning data;
analyzing and judging the damage or abnormality in the copper pipe.
Example 3:
a traceless welding process for an internal thread copper pipe comprises the following steps:
(1) blanking, namely cutting a copper pipe with a specified length;
(2) cleaning, cleaning the obtained copper pipe:
(3) preheating a copper pipe, drying the cleaned copper pipe and carrying out preheating treatment; the width of the welding seam is measured before preheating, the preheating range of the surface of the copper pipe is controlled to be more than or equal to three times of the wall thickness of the copper pipe on the premise of being based on the center of the welding seam, and meanwhile, heat preservation is carried out on the surface of the copper pipe except the preheating position.
(4) High-frequency welding, namely, controlling the input of high-frequency current and voltage by adopting a high-frequency induction welding power supply to realize the welding between the connecting surfaces of the two copper pipes;
(5) cooling and deslagging, namely grinding and cleaning welding slag at the position of the welding seam by adopting polishing equipment;
(6) stress treatment, namely performing stress treatment on the welding seam position by adopting ultrasonic waves;
(7) thread milling, namely performing thread milling on the welded copper pipe in a milling mode to form an internal thread copper pipe;
(8) and (4) ultrasonic flaw detection, namely performing ultrasonic flaw detection on the surface of the copper pipe in an ultrasonic mode and removing unqualified welded copper pipes.
And (2) cleaning the copper pipe, namely removing oxides, impurities and oil stains on the surface of the copper pipe, and grinding burrs on the cut surface.
The method comprises the steps of adopting a shot blasting machine, throwing steel shots out of the shot blasting machine by utilizing centrifugal force to impact the surfaces of copper pipes, carrying out knocking grinding on oxides on the surfaces of the copper pipes, removing oxide skins and corrosion, then putting the copper pipes without the oxide skins and the corrosion into a cleaning box, putting alkali liquor into the cleaning box, immersing the copper pipes, realizing oil removal, taking out the copper pipes after the oil removal is finished, drying the copper pipes by adopting an air heater, and polishing burrs on the section of the copper pipes by adopting grinding equipment until the surfaces of the copper pipes are smooth.
And (4) welding the copper pipe by high frequency welding, cleaning and preheating a welding rod, wherein the welding process adopts an alkaline welding rod.
The welding rod is cleaned before being used, so that residual impurities are avoided, the welding rod is preheated simultaneously, the wet condition is avoided, different types of welding rods are stored respectively, and after being preheated and dried, the welding rod is placed in a heat preservation box at the temperature of 100-150 ℃ to keep a closed environment.
And (5) cooling and deslagging, namely cooling the welded copper pipe by adopting a natural cooling mode, and grinding the welding seam position inside and outside the copper pipe by adopting grinding equipment after cooling is finished until no obvious bulge is formed at the welding seam position.
And (6) stress treatment, namely performing ultrasonic impact treatment on the welding seam position on the surface of the copper pipe by adopting an HTUIT-20 type domestic ultrasonic aging instrument.
In the ultrasonic treatment process, the working current of an ultrasonic aging instrument is 1.2-1.5A, the vibration frequency is kept at 30KHz, the impact speed is 100mm/min, the ultrasonic wave impacts the weld joint for three times in a reciprocating mode, and simultaneously, the high-power energy is used for impacting the metal surface by an impact tool in a high-frequency mode, so that the surface layer of the copper pipe generates large compression plastic deformation under the action of high-frequency, high-efficiency and focused large energy, meanwhile, the ultrasonic wave impact wave changes the original stress field, a certain numerical value of compressive stress is generated, part of tensile stress is converted into the compressive stress, and the impacted part is strengthened.
And (7) performing thread milling, namely performing thread machining by adopting a three-axis linkage machine tool, wherein the cutter is a hard alloy integral type three-tooth thread milling cutter, the rotating speed of the cutter is 3000r/min, and the feeding amount is 2500 mm/min.
And (8) carrying out ultrasonic flaw detection, namely carrying out surface flaw detection on the copper pipe by adopting a phased array probe.
The ultrasonic flaw detection comprises the following steps:
selecting a proper phased array probe according to the diameter and the wall thickness of the copper pipe, and connecting the phased array probe with a phased array detector;
controlling a phased array probe to move along the axial direction on the surface of the copper pipe and simultaneously performing rotary scanning;
acquiring scanning images of all cross-section positions of the copper pipe, and acquiring a scanning result of the whole copper pipe according to the copper pipe data and the scanning data;
analyzing and judging the damage or abnormality of the copper pipe.
The following table is obtained according to examples 1 to 3:
in summary, the present invention:
the invention can facilitate the subsequent welding process to be smoothly carried out when the copper pipe is preheated in the welding process, and simultaneously, after the welding is finished, the cooling speed of the welded copper pipe can be reduced due to the arranged heat preservation means, the welding stress is reduced, meanwhile, an ultrasonic stress removing mode is adopted, high-power energy is impacted on the metal surface by an impact tool in a high-frequency mode, the surface layer of the copper pipe generates larger compression plastic deformation under the action of high-frequency, high-efficiency and focused large energy, meanwhile, the ultrasonic impact wave changes the original stress field, generates a certain numerical value of compressive stress, strengthens the impacted part, slowly reduces the temperature, reduces the generation of the stress at the welding position of the copper pipe, simultaneously, and the subsequent ultrasonic stress removing mode can treat the stress to a larger degree, and ensures the performance and the service life of the welded copper pipe to a certain degree.
The welding rod adopted by the invention is an alkaline welding rod, the surface of the welding rod is cleaned and preheated before the welding rod is used, the preheating of the welding rod can dry the welding rod, the probability of air holes generated in the subsequent welding process is reduced, meanwhile, the alkaline welding rod is adopted, the generation of hydrogen is reduced in the welding process, the metallicity of a welding seam is improved, the hydrogen-induced cracks are reduced to a certain extent, the welding material is cleaned before the welding, the influence of oxides or impurities on the welding is avoided, and the probability of slag inclusion in the welding process is reduced;
the invention adopts ultrasonic flaw detection to detect and detect the finished copper pipe, the phased array probe is connected with the phased array detector for use, and the phased array probe is controlled to axially move and rotate on the surface of the copper pipe, so that the multi-angle detection and scanning of each section of the copper pipe are realized, after scanning images of different angles of each section position of the copper pipe are obtained, a corresponding three-dimensional scanning image of the copper pipe can be obtained, the scanning and detecting result of the copper pipe can be judged more intuitively, and the damage and the defect in the copper pipe can be conveniently judged.
The points to be finally explained are: although the present invention has been described in detail with reference to the general description and the specific embodiments, on the basis of the present invention, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The traceless welding process for the internal thread copper pipe is characterized by comprising the following steps of:
(1) blanking, namely cutting a copper pipe with a specified length;
(2) cleaning, cleaning the obtained copper pipe:
(3) preheating a copper pipe, drying the cleaned copper pipe and carrying out preheating treatment;
(4) high-frequency welding, namely, controlling the input of high-frequency current and voltage by adopting a high-frequency induction welding power supply to realize the welding between the connecting surfaces of the two copper pipes;
(5) cooling and deslagging, namely grinding and cleaning welding slag at the position of the welding seam by adopting polishing equipment;
(6) stress treatment, namely performing stress treatment on the welding seam position by adopting ultrasonic waves;
(7) thread milling, namely performing thread milling on the welded copper pipe in a milling mode to form an internal thread copper pipe;
(8) and (4) ultrasonic flaw detection, namely performing ultrasonic flaw detection on the surface of the copper pipe in an ultrasonic mode and removing unqualified welded copper pipes.
2. The traceless welding process for the internal thread copper pipe according to claim 1, which is characterized in that: and (2) cleaning the copper pipe, namely removing oxides, impurities and oil stains on the surface of the copper pipe, and grinding burrs on the cut surface.
3. The traceless welding process for the internal thread copper pipe according to claim 1, wherein the traceless welding process comprises the following steps: and (4) high-frequency welding comprises the steps of welding a copper pipe, cleaning and preheating a welding rod, and an alkaline welding rod is adopted in the welding process.
4. The traceless welding process for the internal thread copper pipe according to claim 1, which is characterized in that: and (5) cooling and deslagging, namely cooling the welded copper pipe by adopting a natural cooling mode, and grinding the welding seam positions inside and outside the copper pipe by adopting grinding equipment after cooling is finished until no obvious bulge is formed at the welding seam position.
5. The traceless welding process for the internal thread copper pipe according to claim 1, which is characterized in that: and (4) performing stress treatment in the step (6), and performing ultrasonic impact treatment on the position of the welding line on the surface of the copper pipe by adopting an HTUIT-20 type domestic ultrasonic aging instrument.
6. The traceless welding process for the internal thread copper pipe according to claim 1, wherein the traceless welding process comprises the following steps: and (4) milling the threads, namely, machining the threads by adopting a three-axis linkage machine tool, wherein the cutter is a hard alloy integral three-tooth thread milling cutter, the rotating speed of the cutter is 3000r/min, and the feeding amount is 2500 mm/min.
7. The traceless welding process for the internal thread copper pipe according to claim 1, which is characterized in that: and (8) carrying out ultrasonic flaw detection, wherein a phased array probe is adopted to carry out surface flaw detection operation on the copper pipe.
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