CN117259888A - Method for eliminating fluorescent display of brazing weld of fuel header pipe - Google Patents
Method for eliminating fluorescent display of brazing weld of fuel header pipe Download PDFInfo
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- CN117259888A CN117259888A CN202311439106.7A CN202311439106A CN117259888A CN 117259888 A CN117259888 A CN 117259888A CN 202311439106 A CN202311439106 A CN 202311439106A CN 117259888 A CN117259888 A CN 117259888A
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- 238000005219 brazing Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 71
- 239000000446 fuel Substances 0.000 title claims description 18
- 238000003466 welding Methods 0.000 claims abstract description 130
- 230000008439 repair process Effects 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 239000000295 fuel oil Substances 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims description 43
- 238000010438 heat treatment Methods 0.000 claims description 42
- 238000001917 fluorescence detection Methods 0.000 claims description 19
- 238000011179 visual inspection Methods 0.000 claims description 18
- 238000005498 polishing Methods 0.000 claims description 16
- 230000007547 defect Effects 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000012459 cleaning agent Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000002932 luster Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 229910000679 solder Inorganic materials 0.000 description 14
- 238000007689 inspection Methods 0.000 description 10
- 239000010953 base metal Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007480 spreading Effects 0.000 description 4
- 238000003892 spreading Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- B23K1/008—Soldering within a furnace
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a method for eliminating the fluorescent display of a brazing weld joint of a fuel oil main pipe, which belongs to the technical field of welding, and adopts a detection means and a principle of ensuring the welding quality of the fuel oil main pipe at the same time, so that the position of a new brazing filler metal to be coated is defined, the vacuum brazing repair welding is carried out on the defined position, the vacuum brazing repair welding technological parameters are designed, and a fine and strict welding quality detection link is formulated. The method for eliminating the fluorescent display of the brazing weld joint has certain engineering application reference value for other vacuum brazing parts while reducing waste loss, reducing production cost and prolonging the service life of the fuel oil main pipe.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a method for eliminating fluorescent display of a brazing weld of a fuel oil main pipe.
Background
The fuel manifold is an important component in an aircraft gas turbine engine and functions to deliver fuel to the interior of the liner of the main combustion chamber of the engine. The fuel oil main pipe for certain aeroengine adopts vacuum brazing process to realize the connection among main pipe, branch pipe, tee joint and other components. After the fuel oil main pipe works for a period of time, a fluorescence detection method is required to be adopted to check that no crack exists at the brazing welding line part. In the actual fluorescence detection operation process, some brazing welding seams are found to show overall fluorescence display, namely the brazing welding seams are overall yellow, so that whether cracks exist on the surfaces of the brazing welding seams cannot be judged. According to the standard requirement of the prior art, the fluorescent display part of the brazing weld joint can be clamped, and then the fluorescent detection is carried out again on the position. However, even if the polishing is performed to a state without a solder angle, the fluorescent display cannot be eliminated. Conventional methods which can be considered by the engineering skilled in the art, such as a high-temperature vacuum purification process, a wet sand blowing process, an alkaline washing process and the like, are not used. And (3) carrying out energy spectrum detection on the fluorescence display part of the brazing weld joint, wherein no abnormal metal or nonmetal redundant matters are covered on the surface of the brazing weld joint. No solution that can be directly referenced is found in the existing patents and papers. Under the current technical background, the final result is that the fuel header pipe which is displayed by the brazing weld fluorescence and cannot be eliminated is scrapped.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for eliminating the fluorescent display of the brazing welding seam of the fuel oil main pipe, which eliminates the fluorescent display phenomenon of the brazing welding seam on the premise of ensuring the welding quality of the fuel oil main pipe, thereby reducing the waste loss, lowering the production cost and prolonging the service life of the fuel oil main pipe.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention discloses a method for eliminating the fluorescent display of a brazing weld joint of a fuel header pipe, which comprises the following steps:
s1: detecting and marking the corresponding position;
s2: polishing, cleaning and coating brazing filler metal at the marked position;
s3: repairing and welding by vacuum brazing and detecting;
s4: and (5) performing a sealing test after the detection is qualified.
Preferably, the detecting and marking the corresponding position specifically includes the following steps:
s101: fluorescence detection is carried out, and the corresponding positions are marked and recorded;
s102: checking repair welding times, searching files, determining the total welding times before the batch of fuel oil main pipes enter the furnace for repair welding at the time, and recording;
s103: x-ray detection and ultrasonic detection are carried out, and information such as the existence position, the size and the like of the brazing weld defect is marked and recorded;
s104: and (5) visually inspecting, and marking and recording information such as the existence position, the size and the like of the brazing weld defects.
Preferably, in S102, the total repair welding number should be no more than two, and if the total repair welding number has reached two, the subsequent steps are not performed.
Preferably, the polishing and cleaning steps are as follows:
polishing all braze welding seams on the fuel oil main pipe until fresh metal luster is exposed and a part matrix cannot be damaged by polishing;
and (3) ultrasonically cleaning and drying the whole part by using a water-based cleaning agent, wiping the part to be welded by using acetone, and airing.
Preferably, the technological parameters of the vacuum brazing repair welding are as follows:
s301: heating to 450 ℃ in a vacuum environment, and preserving heat;
s302: heating to 950 ℃ for the second time and preserving heat;
s303: heating to 1065-1075 ℃ for three times, preserving heat and brazing;
s304: vacuum cooling to below 900 deg.c, backfilling with argon gas, cooling to below 100 deg.c with argon-fan, and discharging.
Preferably, in the step S301, the temperature is raised to 450 ℃ at a heating rate of 330-390 ℃/h, and the temperature is kept for 10-15 min.
Preferably, in the step S302, the temperature is raised to 950 ℃ at a heating rate of 630-690 ℃/h, and the temperature is kept for 15-30 min.
Preferably, in the step S303, the temperature is raised to 1065-1075 ℃ at a heating rate of 390-510 ℃/h, and the temperature is kept for 20-30 min, so that the brazing is implemented.
Preferably, the detection after the repair welding of the vacuum brazing specifically comprises the following steps:
s305: visual inspection: visual inspection is carried out on appearance quality of all brazing welding seams on the fuel oil main pipe according to related process standard requirements;
s306: x-ray detection and ultrasonic detection: performing X-ray detection and ultrasonic detection on the quality of all brazing welding seams on the fuel oil main pipe according to the related process standard requirements;
s307: fluorescence detection: and carrying out fluorescence detection on all the brazing welding seams on the fuel oil main pipe according to the related process standard requirements.
Preferably, if the detection after the repair welding of the vacuum brazing is not qualified, repeating the repair welding within the range allowed by the two repair welding opportunities until all detection items of the part are qualified or no repair welding machine is available.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for eliminating the fluorescent display of a brazing weld joint of a fuel oil main pipe, which takes the welding quality of the fuel oil main pipe as a principle through a detection means, confirms the position of coating new brazing filler metal, carries out vacuum brazing repair welding aiming at the clear position, designs the technological parameters of the vacuum brazing repair welding, and formulates a fine and strict welding quality detection link. The method for eliminating the fluorescent display of the brazing weld joint has certain engineering application reference value for other vacuum brazing parts while reducing waste loss, reducing production cost and prolonging the service life of the fuel oil main pipe.
Drawings
FIG. 1 is a surface topography of a braze joint with a fluorescent display site;
FIG. 2 is a surface topography of a non-fluorescent display portion of a braze joint;
FIG. 3 is a flow chart of the present invention;
FIG. 4 is a flow chart of embodiment 1 of the present invention;
fig. 5 is a schematic diagram of the structure of the braze joint portion of the fuel manifold.
Wherein: 1-a main pipe; 2-branch pipes; 3-tee joint; 4-a first weld; 5-a second weld.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 5, a structural schematic diagram of a braze joint part of a fuel oil main pipe is shown, a first welding line 4 exists at a joint of the main pipe 1 and a tee joint 3, a second welding line 5 exists at a joint of the tee joint 3 and a branch pipe 2, and a fluorescent display part of the braze joint and a normal part of the braze joint are respectively observed by adopting a scanning electron microscope, which is particularly shown in fig. 1 and 2. It can be seen that the positions of the brazing weld joint with fluorescence display have different degrees of looseness or holes, the looseness or holes have a certain level and depth, and the surface of the brazing weld joint without fluorescence display is compact, and the looseness or holes are not seen.
Thus, it is speculated that the fluorescence is caused by loose or porous pockets in the braze joint, which retain the phosphor. Furthermore, to eliminate the fluorescent display on the braze joint, the porosity or holes on the braze joint should be eliminated first. The invention utilizes the welding repairing opportunities allowed in the vacuum brazing related standard, comprehensively considers the welding parameters and the process route arrangement in the new product processing, starts from the links of repairing welding process parameters, whether new brazing filler metal is coated or not, monitoring the welding quality before and after welding, and the like, develops a great deal of mechanism analysis and process test research, and finally refines and forms a method for eliminating the fluorescence display of the brazing welding seam of the fuel oil main pipe and simultaneously ensuring the welding quality.
Referring to fig. 3, the invention discloses a method for eliminating the fluorescent display of a brazing weld of a fuel header pipe, which comprises the following steps:
s1: detecting and marking the corresponding position;
s2: polishing, cleaning and coating brazing filler metal at the marked position;
s3: repairing and welding by vacuum brazing and detecting;
s4: and (5) performing a sealing test after the detection is qualified.
In some embodiments, the detecting and marking the corresponding position specifically includes the steps of:
s101: fluorescence detection is carried out, and the corresponding positions are marked and recorded;
fluorescence detection: and (3) performing fluorescence detection on all the brazing welding seams on the fuel oil main pipe according to the related process standard requirements, marking out the positions on the brazing welding seams, which are displayed by fluorescence and cannot be judged whether the brazing welding seam cracks exist, and recording the corresponding positions.
S102: checking repair welding times, searching files, determining the total welding times before the batch of fuel oil main pipes enter the furnace for repair welding at the time, and recording;
checking repair welding times: searching the file, determining the total welding times of the batch of fuel oil main pipes before the furnace repair welding and recording. The total repair welding times should not be greater than two times. Total repair welding times = total welding times-new product no repair welding one welding forming times. If the total repair welding times are up to two times when the step is executed, the subsequent steps are not executed any more.
S103: x-ray detection and ultrasonic detection are carried out, and information such as the existence position, the size and the like of the brazing weld defect is marked and recorded;
x-ray detection: x-ray detection is carried out on the quality of the brazing welding seam of the main pipe and the three-way joint according to the related process standard requirements, and information such as the existence position and the size of the brazing welding seam defect is marked and recorded.
Ultrasonic detection: ultrasonic detection is carried out on the quality of the brazing welding seam of the branch pipe and the three-way joint according to the related process standard requirements, and information such as the existence position and the size of the brazing welding seam defect is marked and recorded.
S104: and (5) visually inspecting, and marking and recording information such as the existence position, the size and the like of the brazing weld defects.
Visual inspection: visual inspection is carried out on appearance quality of all brazing welding seams on the fuel oil main pipe according to related process standard requirements, and information such as existence position and size of the brazing welding seam defects is marked and recorded.
In some embodiments, in S102, the total repair welding number should be no more than two, and if the total repair welding number has reached two, the subsequent steps are not performed.
In some embodiments, the polishing and cleaning is specifically:
polishing all braze welding seams on the fuel oil main pipe until fresh metal luster is exposed and a part matrix cannot be damaged by polishing;
and (3) ultrasonically cleaning and drying the whole part by using a water-based cleaning agent, wiping the part to be welded by using acetone, and airing. The surface of the cleaned part should be free from dirt and other dirt.
In some embodiments, the process parameters of the vacuum brazing repair are:
s301: heating to 450 ℃ in a vacuum environment, and preserving heat;
s302: heating to 950 ℃ for the second time and preserving heat;
s303: heating to 1065-1075 ℃ for three times, preserving heat and brazing;
s304: vacuum cooling to below 900 deg.c, backfilling with argon gas, cooling to below 100 deg.c with argon-fan, and discharging.
In some embodiments, in S301, the temperature is raised to 450 ℃ at a heating rate of 330-390 ℃ per hour, and the temperature is kept for 10-15 min.
In some embodiments, in S302, the temperature is raised to 950 ℃ at a heating rate of 630-690 ℃/h, and the temperature is kept for 15-30 min.
In some embodiments, in S303, the temperature is raised to 1065-1075 ℃ at a heating rate of 390-510 ℃ per hour, and the temperature is kept for 20-30 min, and brazing is performed.
The purpose of the furnace feeding repair welding in the step is to eliminate the fluorescent display of the brazing weld joint of the fuel oil main pipe, namely to eliminate the looseness or holes on the brazing weld joint. The melting of the base metal to the brazing filler metal and the diffusion of the brazing filler metal to the base metal in the vacuum brazing process lead to the improvement of the remelting temperature of the brazing seam compared with that of the welding of a new product. Therefore, when designing repair welding process parameters, the following aspects need to be comprehensively considered: remelting and spreading of the original solder, melting and spreading of the newly added solder, and interaction with the original solder, and influences of the vacuum brazing thermal cycle process on the internal quality of the weld joint, such as an X-ray detection result, an ultrasonic detection result, and the like. Through a large number of mechanism analysis and process test researches, the invention finally determines the repair welding process parameters required for eliminating the fluorescent display of the brazing weld joint as follows: heating to 450 ℃ at a heating rate of 330-390 ℃ per hour under a vacuum environment, and preserving heat for 10-15 min; heating to 950 ℃ at a heating rate of (630-690) DEG C/h, and preserving heat for (15-30) min; heating to (1065-1075) DEG C at a heating rate of (390-510) DEG C/h, and preserving heat for (20-30) min to braze the parts; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace.
In some embodiments, the vacuum brazing repair welding further comprises, before the brazing filler metal is coated: the powder nickel-base solder used in the welding of new products is mixed with adhesive according to a certain proportion to prepare a paste nickel-base solder. And (3) coating a proper amount of prepared paste solder on the corresponding positions with weld defects (such as fluorescent display, unqualified X-ray detection, unqualified ultrasonic detection, unqualified visual inspection and unqualified sealing test).
In some embodiments, the detection after the repair welding of the vacuum brazing specifically comprises the following steps:
s305: visual inspection: visual inspection is carried out on appearance quality of all brazing welding seams on the fuel oil main pipe according to related process standard requirements;
s306: x-ray detection and ultrasonic detection: performing X-ray detection and ultrasonic detection on the quality of all brazing welding seams on the fuel oil main pipe according to the related process standard requirements;
s307: fluorescence detection: and carrying out fluorescence detection on all the brazing welding seams on the fuel oil main pipe according to the related process standard requirements.
If the visual inspection, X-ray detection, ultrasonic detection and fluorescence detection are all qualified, the fuel oil main pipe is subjected to a sealing test according to the use function of the fuel oil main pipe in an engine, and all brazing welding seams are checked to be free of leakage.
In some embodiments, if the post-repair-weld inspection is not acceptable, then the repair welding is repeated within the range allowed by the two repair welding opportunities until all inspection items of the part are acceptable or no repair welding machine will be present.
It should be noted that if any one of the above-mentioned visual inspection, X-ray inspection, ultrasonic inspection, fluorescent inspection, and sealing test is failed, repair welding can be repeated within the range allowed by the two repair welding opportunities until all the inspection items of the parts are passed or no repair welding machine can be used.
[ example 1 ]
Referring to fig. 4, the embodiment provides a method for eliminating the fluorescent display of the brazing weld of the fuel header pipe, which specifically comprises the following steps:
step 1, fluorescence detection: and (3) performing fluorescence detection on all the brazing welding seams on the fuel oil main pipe according to the related process standard requirements, marking out the positions on the brazing welding seams, which are displayed by fluorescence and cannot be judged whether the brazing welding seam cracks exist, and recording the corresponding positions.
Step 2, checking repair welding times: searching the file, determining the total welding times of the batch of fuel oil main pipes before the furnace repair welding and recording. The total repair welding times should not be greater than two times. Total repair welding times = total welding times-new product no repair welding one welding forming times. If the total repair welding times are up to two times when the step is executed, the subsequent steps are not executed any more.
Step 3, X-ray detection: x-ray detection is carried out on the quality of the brazing welding seam of the main pipe and the three-way joint according to the related process standard requirements, and information such as the existence position and the size of the brazing welding seam defect is marked and recorded. Step 3 may also be performed after step 4.
Step 4, ultrasonic detection: ultrasonic detection is carried out on the quality of the brazing welding seam of the branch pipe and the three-way joint according to the related process standard requirements, and information such as the existence position and the size of the brazing welding seam defect is marked and recorded. Step 4 may also be performed before step 3.
Step 5, visual inspection: visual inspection is carried out on appearance quality of all brazing welding seams on the fuel oil main pipe according to related process standard requirements, and information such as existence position and size of the brazing welding seam defects is marked and recorded.
Step 6, polishing and cleaning: polishing all braze welding seams on the fuel oil main pipe until the fresh metallic luster is exposed, and taking care that the part matrix cannot be damaged by polishing. And (3) carrying out ultrasonic cleaning on the whole part by using a water-based cleaning agent, wiping a part to be welded by using clean acetone after the part is dried, and then airing the part, wherein the surface of the cleaned part is free from oil dirt and other dirt.
And 7, coating and injecting solder: the powder nickel-base solder used in the welding of new products is mixed with adhesive according to a certain proportion to prepare a paste nickel-base solder. And (3) coating a proper amount of prepared paste solder on the corresponding positions with weld defects (such as fluorescent display, unqualified X-ray detection, unqualified ultrasonic detection, unqualified visual inspection and unqualified sealing test).
Step 8, vacuum brazing repair welding: the purpose of the furnace feeding repair welding in the step is to eliminate the fluorescent display of the brazing weld joint of the fuel oil main pipe, namely to eliminate the looseness or holes on the brazing weld joint. The melting of the base metal to the brazing filler metal and the diffusion of the brazing filler metal to the base metal in the vacuum brazing process lead to the improvement of the remelting temperature of the brazing seam compared with that of the welding of a new product. Therefore, when designing repair welding process parameters, the following aspects need to be comprehensively considered: remelting and spreading of the original solder, melting and spreading of the newly added solder, and interaction with the original solder, and influences of the vacuum brazing thermal cycle process on the internal quality of the weld joint, such as an X-ray detection result, an ultrasonic detection result, and the like. Through a large number of mechanism analysis and process test researches, the invention finally determines the repair welding process parameters required for eliminating the fluorescent display of the brazing weld joint as follows: heating to 450 ℃ at a heating rate of 360 ℃/h under a vacuum environment, and preserving heat for 13min; heating to 950 ℃ at a heating rate of 660 ℃/h, and preserving heat for 23min; heating to 1070 ℃ at a heating rate of 450 ℃/h, and preserving heat for 25min to braze the parts; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace.
Step 9, visual inspection: visual inspection of all braze joint appearance quality on the fuel manifold was performed as required by the relevant process standards.
Step 10, X-ray detection: and carrying out X-ray detection on the quality of the brazing weld joint of the main pipe and the three-way joint according to the related process standard requirements. Step 10 may also be performed after step 11.
Step 11, ultrasonic detection: and carrying out ultrasonic detection on the quality of the brazing weld joint of the branch pipe and the three-way joint according to the related process standard requirements. Step 11 may also be performed before step 10.
Step 12, fluorescence detection: and carrying out fluorescence detection on all the brazing welding seams on the fuel oil main pipe according to the related process standard requirements.
Step 13, sealing test: if the visual inspection, X-ray detection, ultrasonic detection and fluorescence detection in the steps 9 to 12 are all qualified, the fuel oil main pipe is subjected to a sealing test according to the use function of the fuel oil main pipe in the engine, and all brazing welding seams are checked to be free of leakage.
It should be noted that if any one of the steps 9 to 13 is failed in the visual inspection, the X-ray inspection, the ultrasonic inspection, the fluorescent inspection, and the sealing test, the repair welding can be performed by repeating the steps 6 to 13 within the range allowed by the two repair welding opportunities until all the inspection items of the parts are qualified or no repair welding machine is available.
[ example 2 ]
The present embodiment is substantially the same as embodiment 1, except that in the present embodiment, the process parameters selected in step 8 are: heating to 450 ℃ at a heating rate of 390 ℃/h under a vacuum environment, and preserving heat for 15min; heating to 950 ℃ at a heating rate of 690 ℃/h, and preserving heat for 30min; heating to 1065 ℃ at a heating rate of 510 ℃/h, and preserving heat for 30min to braze the parts; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace. The rest of the process, parameters and method are the same as in example one.
[ example 3 ]
The present embodiment is substantially the same as embodiment 1, except that in the present embodiment, the process parameters selected in step 8 are: heating to 450 ℃ at a heating rate of 330 ℃/h under a vacuum environment, and preserving heat for 10min; heating to 950 ℃ at a heating rate of 630 ℃/h, and preserving heat for 15min; heating to 1075 ℃ at a heating rate of 390 ℃/h, and preserving heat for 20min to braze the parts; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ and discharged from the furnace. The rest of the procedure, parameters and method are the same as in example 2.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The method for eliminating the fluorescent display of the brazing weld joint of the fuel header pipe is characterized by comprising the following steps of:
detecting and marking the corresponding position;
polishing, cleaning and coating brazing filler metal at the marked position;
repairing and welding by vacuum brazing and detecting;
and (5) performing a sealing test after the detection is qualified.
2. The method for eliminating the fluorescent display of the brazing weld of the fuel header pipe according to claim 1, wherein the detecting and marking the corresponding position specifically comprises the following steps:
s101: fluorescence detection is carried out, and the corresponding positions are marked and recorded;
s102: checking repair welding times, searching files, determining the total welding times before the batch of fuel oil main pipes enter the furnace for repair welding at the time, and recording;
s103: x-ray detection and ultrasonic detection are carried out, and information such as the existence position, the size and the like of the brazing weld defect is marked and recorded;
s104: and (5) visually inspecting, and marking and recording information such as the existence position, the size and the like of the brazing weld defects.
3. The method for eliminating fluorescent display of brazing seams of a fuel header pipe according to claim 2, wherein in S102, the total repair welding number is not more than two, and if the total repair welding number has reached two, the subsequent steps are not performed.
4. The method for eliminating the fluorescent display of the brazing weld of the fuel header pipe according to claim 1, wherein the polishing and cleaning are specifically as follows:
polishing all braze welding seams on the fuel oil main pipe until fresh metal luster is exposed and a part matrix cannot be damaged by polishing;
and (3) ultrasonically cleaning and drying the whole part by using a water-based cleaning agent, wiping the part to be welded by using acetone, and airing.
5. The method for eliminating the fluorescent display of the brazing weld of the fuel header pipe according to claim 1, wherein the technological parameters of the vacuum brazing repair welding are as follows:
s301: heating to 450 ℃ in a vacuum environment, and preserving heat;
s302: heating to 950 ℃ for the second time and preserving heat;
s303: heating to 1065-1075 ℃ for three times, preserving heat and brazing;
s304: vacuum cooling to below 900 deg.c, backfilling with argon gas, cooling to below 100 deg.c with argon-fan, and discharging.
6. The method for eliminating the fluorescent display of the brazing seam of the fuel header pipe according to claim 5, wherein in the step S301, the temperature is raised to 450 ℃ at a heating rate of 330-390 ℃ per hour, and the temperature is kept for 10-15 min.
7. The method for eliminating the fluorescent display of the brazing seam of the fuel header pipe according to claim 5, wherein in the step S302, the temperature is raised to 950 ℃ at a heating rate of 630-690 ℃/h, and the temperature is kept for 15-30 min.
8. The method for eliminating the fluorescent display of the brazing seam of the fuel header pipe according to claim 5, wherein in the step S303, the temperature is raised to 1065-1075 ℃ at a heating rate of 390-510 ℃/h, and the temperature is kept for 20-30 min, so that the brazing is performed.
9. The method for eliminating the fluorescent display of the brazing weld joint of the fuel oil main pipe according to claim 1, wherein the detection after the repair welding of the vacuum brazing specifically comprises the following steps:
s305: visual inspection: visual inspection is carried out on appearance quality of all brazing welding seams on the fuel oil main pipe according to related process standard requirements;
s306: x-ray detection and ultrasonic detection: performing X-ray detection and ultrasonic detection on the quality of all brazing welding seams on the fuel oil main pipe according to the related process standard requirements;
s307: fluorescence detection: and carrying out fluorescence detection on all the brazing welding seams on the fuel oil main pipe according to the related process standard requirements.
10. The method for eliminating the fluorescent display of the brazing weld joint of the fuel oil main pipe according to claim 1, wherein if the detection after the repair welding of the vacuum brazing is failed, the repair welding is repeated within the range allowed by the two repair welding opportunities until all detection items of the parts are qualified or no repair welding machine can be used.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311439106.7A CN117259888A (en) | 2023-10-31 | 2023-10-31 | Method for eliminating fluorescent display of brazing weld of fuel header pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311439106.7A CN117259888A (en) | 2023-10-31 | 2023-10-31 | Method for eliminating fluorescent display of brazing weld of fuel header pipe |
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| CN117259888A true CN117259888A (en) | 2023-12-22 |
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| CN202311439106.7A Pending CN117259888A (en) | 2023-10-31 | 2023-10-31 | Method for eliminating fluorescent display of brazing weld of fuel header pipe |
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| CN (1) | CN117259888A (en) |
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