CN114210640A - Method and system for cleaning and checking welding defects of large stainless steel welding component - Google Patents
Method and system for cleaning and checking welding defects of large stainless steel welding component Download PDFInfo
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- CN114210640A CN114210640A CN202111391214.2A CN202111391214A CN114210640A CN 114210640 A CN114210640 A CN 114210640A CN 202111391214 A CN202111391214 A CN 202111391214A CN 114210640 A CN114210640 A CN 114210640A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 115
- 238000003466 welding Methods 0.000 title claims abstract description 75
- 230000007547 defect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- 239000010935 stainless steel Substances 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 65
- 239000002253 acid Substances 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 216
- 239000008367 deionised water Substances 0.000 claims description 64
- 229910021641 deionized water Inorganic materials 0.000 claims description 64
- 238000005238 degreasing Methods 0.000 claims description 42
- 238000003756 stirring Methods 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 19
- 238000007602 hot air drying Methods 0.000 claims description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 11
- 230000002378 acidificating effect Effects 0.000 claims description 10
- 229920000742 Cotton Polymers 0.000 claims description 9
- 239000003960 organic solvent Substances 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 27
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 description 22
- 230000035515 penetration Effects 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002357 osmotic agent Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- -1 welding beading Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/14—Removing waste, e.g. labels, from cleaning liquid
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a method and a system for cleaning and checking welding defects of large stainless steel welding components, which comprises the following steps: s1: preliminarily removing oil stains on the surface of the component; s2: thoroughly removing oil stains on the surface of the component; s3: preliminarily removing deoiling liquid on the surface of the component; s4: removing the deoiling liquid remained on the surface of the component; s5: checking whether the oil removal on the surface of the component is complete; s6: removing residual impurities on the component by using an acid cleaning solution, and simultaneously exposing a welding area; s7: removing the cleaning liquid on the member; s8: removing foreign matters and dust adhered to the member; s9: drying the component; s10: visually inspecting the entire component surface; according to the invention, a complete cleaning production line is formed, the labor amount of staff is reduced, the potential safety hazard is reduced, and secondary pollution is avoided in the detection process.
Description
Technical Field
The invention relates to the technical field of welding defect detection, in particular to a method for cleaning and detecting welding defects of a large stainless steel welding component.
Background
Large stainless steel welding components need to be subjected to weld quality detection before assembly; the traditional detection scheme adopts fluorescence penetration detection, and the specific process of the fluorescence penetration detection is as follows: pre-cleaning before infiltration, drying, applying an osmotic agent, removing the osmotic agent, inspecting in a movable darkroom, drying, applying a developer, and inspecting in the darkroom; fluorescence penetrant detection has the following disadvantages:
1. turnover is troublesome in the fluorescence penetration detection process; whether online movable darkroom inspection is washd in place, still need to move into fixed darkroom with the component after applying the developer, judge by detection personnel under the ultraviolet light at last, because component specification size is big: 10000X2000X3000, about 21T, no matter the activity darkroom or fixed darkroom is difficult to operate, so huge component transfer, must increase staff's amount of labour and have serious potential safety hazard.
2. The fluorescent penetration detection needs to apply developer to the component for powder explosion treatment, the phenomenon that the residual part of the developer is in the inner cavity, the groove and the hole of the component must exist when the developer is applied to adsorb the fluorescent penetrating fluid at the defective part, the developer is difficult to remove completely after the detection, and new pollution is added to the component when the defect is detected.
3. The fluorescent penetrant is relatively high in cost, so that penetrant on a member flows into a fluorescent waste liquid pipeline and is collected to a sewage treatment station when the member with the penetrant is cleaned.
4. The fluorescence penetration detection is to detect defects in a dark room, and has large influence factors on vision.
Disclosure of Invention
The invention aims to: aiming at the problems of troublesome turnover, high potential safety hazard, easy generation of secondary pollution, high cost and certain influence on vision of the existing fluorescence penetration detection, the method for cleaning and checking the welding defects of the large stainless steel welding component is provided, and the problems are solved.
The technical scheme of the invention is as follows:
a method for cleaning and checking welding defects of large stainless steel welding components comprises the following steps:
s1: cleaning the component by using an organic solvent, and preliminarily removing oil stains on the surface of the component; in the step S1, most of oil stains which are visible and can be contacted with naked eyes on the surface of the component are mainly removed, so that the effect of preliminary oil stain removal is achieved;
s2: thoroughly removing oil stains on the surface of the component by adopting water-based degreasing liquid; the step S2 is used for completely removing oil stains on the surface of the component and cleaning obstacles for subsequent cleaning liquid;
s3: cleaning the component by hot deionized water, and preliminarily removing deoiling liquid on the surface of the component; the step S3 is used for rapidly washing away the deoiling liquid remained on the surface of the component by using hot deionized water, so as to avoid bringing the deoiling liquid into subsequent cleaning liquid and polluting the cleaning liquid;
s4: cleaning the component by cold deionized water, and removing the deoiling liquid remained on the surface of the component; the step S4 is used for cleaning the residual trace degreasing fluid on the component again by using cold deionized water so as to thoroughly clean the degreasing fluid on the component;
s5: checking whether the oil removal on the surface of the component is complete or not by adopting a water film non-breaking method; if the water film is not broken, performing step S6; if the water film is broken, repeating the steps S2-S5, and continuously removing the deoiling liquid remained on the surface of the component; the step S5 is mainly aimed at checking the degreasing effect of the steps S2-S4; ensuring that the surface of the component is completely deoiled so as to enter the next step;
s6: removing residual impurities on the component by using acid washing cleaning liquid, and simultaneously exposing a welding area; such impurities include, but are not limited to: foreign matters such as scrap iron, welding slag, welding beading, slag inclusion and the like;
s7: cleaning the component with cold deionized water to remove the cleaning liquid on the component; detection errors caused by cleaning fluid are avoided;
s8: spraying and cleaning the component by a high-pressure water gun to remove foreign matters and dust adhered on the component; the step S8 is to remove a small amount of foreign matters adhered on the surface of the processed component and the hanging ash generated by the chemical reaction in the step S6, so as to achieve the purpose of clean cleaning;
s9: drying the component after spray cleaning; the function of the step S9 is: providing an inspection target for step S10 for judging whether the welding quality of the member is acceptable;
s10: visually inspecting the entire component surface; i.e. the inspector inspects (visually inspects) the entire component surface with VT:
when no residual liquid seeps out of the welding area, judging that the welding quality of the component is qualified; and when the residual liquid seeps out of the welding area, judging that the welding quality of the component is not qualified.
Preferably, the detailed step of step S1 is:
s11: placing the component on an upper thread station; step S11, the existing running mechanism is adopted to stably place the component on the online station to wait for the processing of the staff;
s12: the surface of the component is scrubbed by cotton cloth dipped with an organic solvent to remove most of oil stains on the surface of the component; the cotton cloth is non-fluffy, so that the cotton threads on the cotton cloth are prevented from being hung on the surface of the component in the scrubbing process to cause new pollution;
preferably, the organic solvent is conventional absolute ethanol or gasoline.
Preferably, the detailed step of step S2 is:
s21: moving the component to a first water tank filled with water machine deoiling liquid; step S21, placing the component in the first water tank by a travelling mechanism, and completely covering the component by the hot deionized water in the first water tank;
s22: filling clean compressed air into the first water tank to stir the water-based degreasing liquid; meanwhile, the water-based degreasing liquid is continuously replaced by adopting a circulating filter, so that the water-based degreasing liquid obtained in the first water tank is fully circulated, and the cleaned oil stain is continuously collected in the circulating process; preventing secondary pollution.
Ultrasonic waves may also be applied to the first water tank in step S22 to enhance the oil removal force and oil removal efficiency.
According to the amount of greasy dirt on the surface of the component, the following different water-based degreasing liquids can be selected:
1. self-prepared alkaline degreasing fluid is selected when oil stains are more
The main components of the composition comprise:
when the self-prepared alkaline degreasing liquid is used as the water-based degreasing liquid, the temperature is ensured to be 70-90 ℃, and the cleaning time is 20-30 min.
2. Selecting finished water-based degreasing fluid when oil contamination is low
The model number is: TURCO 4215NC-LT 45-60 g/L
When the finished water-based degreasing liquid is adopted as the water-based degreasing liquid, the temperature is ensured to be 45-55 ℃, and the cleaning time is 10-20 min.
Preferably, when in use, the self-prepared alkaline degreasing fluid can be selected for pre-degreasing according to the amount of oil stains, and then the finished water-based degreasing fluid is used for fine degreasing.
Preferably, the detailed step of step S3 is:
s31: moving the member to a second water tank containing heated deionized water; step S31, placing the component in a second water tank by a travelling mechanism, and completely covering the component by the hot deionized water in the second water tank;
s32: filling clean compressed air into the second water tank to stir the hot deionized water;
the temperature of the hot deionized water is kept between 40 and 60 ℃; the resistivity of the deionized water is more than or equal to 100000 omega cm; the stirring time is controlled to be 0.5-1 min.
The detailed step of step S4 is:
s41: moving the member to a third water tank containing cold deionized water; step S41, placing the component in a third water tank by a travelling mechanism, and completely covering the component by cold deionized water in the third water tank;
s42: filling clean compressed air into the third water tank to stir the cold deionized water;
the temperature of the cold deionized water is normal temperature, namely the temperature of the cold deionized water is consistent with the room temperature; the resistivity of the deionized water is more than or equal to 100000 omega cm; the stirring time is controlled to be 0.5-1 min.
Preferably, the detailed step of step S5 is: after the component is far away from the cold deionized water, a water film is formed on the surface of the component; if the water film is complete and continuous within a certain time, the oil stain on the surface of the component is judged to be completely removed; if the water film is shrunk and broken within a certain time, determining that the oil stain on the surface of the component is not completely removed, and returning to the step S2 to carry out oil removal treatment again; namely, a travelling mechanism is adopted to lift the component out of the water surface, and the component is observed by naked eyes; the certain time is preferably within 30 seconds.
Preferably, the detailed step of step S6 is:
s61: moving the member to a fourth tank containing an acidic cleaning solution; step S61, placing the component in a fourth water tank by adopting a travelling mechanism, and completely covering the component by the acidic cleaning solution in the fourth water tank;
s62: filling clean compressed air into the fourth water tank to stir the acid cleaning solution, and continuously replacing the acid cleaning solution by adopting a circulating filter; the acid cleaning solution is contacted with the component to erode residual impurities on the component, and simultaneously, the acid etching is carried out on the weld joint defect to expose the weld joint defect.
The acidic cleaning solution comprises the following components: 15 to 25 percent of nitric acid and 8 to 10 percent of hydrofluoric acid; and the temperature of the acidic cleaning solution is kept at normal temperature, and the stirring time is controlled to be 5-10 min.
The specific gravity of the acid in the nitric acid is 1.42 g/ml; the specific gravity of the acid in the hydrofluoric acid is 1.1 g/ml.
Preferably, the detailed step of step S7 is:
s71: moving the member to a fifth water tank containing cold deionized water; step S71, placing the component in a fifth water tank by a travelling mechanism, and completely covering the component by cold deionized water in the fifth water tank;
s72: filling clean compressed air into the fifth water tank to stir the cold deionized water;
the temperature of the cold deionized water is normal temperature, the resistivity of the deionized water is more than or equal to 100000 omega-cm, and the cleaning time is kept between 0.5 and 1 min.
Preferably, the detailed step of step S8 is:
s81: moving the member into the void; step S81, placing the component in the empty groove by adopting a travelling crane mechanism; a small amount of foreign matters are adhered to the surface of a component in the lifting process of the traveling mechanism and hanging dust generated by chemical reaction in the cleaning process of acid cleaning liquid;
s82: after the components are placed stably, a high-pressure water gun connected with clean compressed air is adopted to spray and clean the components; thereby achieving the purpose of cleaning; preferably, the pressure of the clean compressed air is kept between 0.3 and 0.5 MPa.
The water used by the high-pressure water gun is cold deionized water; the resistivity of the cold deionized water is more than or equal to 100000 omega cm.
Preferably, the detailed step of step S9 is:
s91: moving the member into a hot air drying tank; step S91, placing the component in a hot air drying groove by adopting a travelling crane mechanism; hot air for drying is introduced into the hot air drying groove;
s92: contacting the member with hot air to dry the member; if the component has welding defects, the welding defects can return exudation liquid in the drying process, the liquid flows out gradually, and traces are left in the drying process for the inspection of the step S10;
the temperature of the hot air is kept at 60-80 ℃, and the drying time is controlled at 20-30 min.
Preferably, in step S10, the component is moved to the offline VT inspection station by the crane mechanism for inspection.
A system for cleaning, cleaning and checking welding defects of large stainless steel welding components comprises an on-line station, a first water tank, a second water tank, a third water tank, a fourth water tank, a fifth water tank, an empty tank, a hot air drying tank and an off-line VT checking station which are sequentially arranged to form a complete detection assembly line; the first water tank and the fourth water tank are externally connected with a circulating filter; and a clean compressed air pipeline is arranged outside the system, is respectively communicated with the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank through branch pipelines, and is provided with a valve.
Compared with the prior art, the invention has the beneficial effects that:
1. the whole cleaning process comprises the steps that hot air drying treatment is completely finished on one cleaning production line, the components do not need to be moved in a large range, the labor amount of workers is reduced, and potential safety hazards are reduced.
2. A method and a system for cleaning and checking welding defects of large stainless steel welding components adopt a plurality of steps to realize complete cleaning and detection of the components without causing secondary pollution of the components.
3. A method and system for cleaning and checking welding defect of large stainless steel welding component, while cleaning the component, the cleaning solution is processed by the circulation filter and then recycled, the carry-over amount after cleaning is little, even under the same carry-over amount, the cost of the cleaning solution in the invention is less than one tenth of the fluorescent penetrating fluid (the cleaning solution is composed of HNO3 and HF, 1 liter of the prepared solution is about 50 yuan, while 1 liter of the fluorescent penetrating fluid is 500 yuan), if the cleaning is careless after the penetration, the penetration treatment is needed again, the amount of the penetrating fluid is multiplied by the operation; compared with a fluorescence permeation detection process, the clean cleaning detection method provided by the invention is low in cost and strong in operability.
4. A method and a system for cleaning and checking welding defects of large stainless steel welding components are provided, after cleaning and drying, VT checking (visual checking) is carried out under natural illumination, the visual effect is small, the defects are more visual and recognizable, and the detection efficiency is higher.
Drawings
FIG. 1 is a flow chart of a method for cleaning and inspecting large stainless steel welded components for weld defects;
FIG. 2 is a schematic diagram of a system for cleaning and inspecting large stainless steel welded components for weld defects.
Reference numerals: 1-an online station, 2-a first water tank, 3-a second water tank, 4-a third water tank, 5-a fourth water tank, 6-a fifth water tank, 7-an empty tank, 8-a hot air drying tank, 9-a offline VT inspection station, 10-a circulating filter and 11-a clean compressed air pipeline.
Detailed Description
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example one
Referring to fig. 1-2, a method for cleaning and inspecting a large stainless steel welding component for welding defects comprises the following steps:
s1: cleaning the component by using an organic solvent, and preliminarily removing oil stains on the surface of the component; in the step S1, most of oil stains which are visible and can be contacted with naked eyes on the surface of the component are mainly removed, so that the effect of preliminary oil stain removal is achieved;
s2: thoroughly removing oil stains on the surface of the component by adopting water-based degreasing liquid; the step S2 is used for completely removing oil stains on the surface of the component and cleaning obstacles for subsequent cleaning liquid;
s3: cleaning the component by hot deionized water, and preliminarily removing deoiling liquid on the surface of the component; the step S3 is used for rapidly washing away the deoiling liquid remained on the surface of the component by using hot deionized water, so as to avoid bringing the deoiling liquid into subsequent cleaning liquid and polluting the cleaning liquid;
s4: cleaning the component by cold deionized water, and removing the deoiling liquid remained on the surface of the component; the step S4 is used for cleaning the residual trace degreasing fluid on the component again by using cold deionized water so as to thoroughly clean the degreasing fluid on the component;
s5: checking whether the oil removal on the surface of the component is complete or not by adopting a water film non-breaking method; if the water film is not broken, performing step S6; if the water film is broken, repeating the steps S2-S5, and continuously removing the deoiling liquid remained on the surface of the component; the step S5 is mainly aimed at checking the degreasing effect of the steps S2-S4; ensuring that the surface of the component is completely deoiled so as to enter the next step;
s6: removing residual impurities on the component by using acid washing cleaning liquid, and simultaneously exposing a welding area; such impurities include, but are not limited to: foreign matters such as scrap iron, welding slag, welding beading, slag inclusion and the like;
s7: cleaning the component with cold deionized water to remove the cleaning liquid on the component; detection errors caused by cleaning fluid are avoided;
s8: spraying and cleaning the component by a high-pressure water gun to remove foreign matters and dust adhered on the component; the step S8 is to remove a small amount of foreign matters adhered on the surface of the processed component and the hanging ash generated by the chemical reaction in the step S6, so as to achieve the purpose of clean cleaning;
s9: drying the component after spray cleaning; the function of the step S9 is: providing an inspection target for step S10 for judging whether the welding quality of the member is acceptable;
s10: visually inspecting the entire component surface; i.e. the inspector inspects (visually inspects) the entire component surface with VT:
when no residual liquid seeps out of the welding area, judging that the welding quality of the component is qualified; and when the residual liquid seeps out of the welding area, judging that the welding quality of the component is not qualified.
Compared with the existing fluorescence penetration detection method, the detection method in the embodiment does not need to apply a developer to the component for powder explosion treatment, does not have the problem that the residual part of the developer is in the inner cavity, the groove and the hole of the component and is difficult to remove after detection, and can not cause secondary pollution to the component after cleaning, detecting and welding defects; and the fluorescence penetration detection method needs to detect defects in a dark room, and has large visual influence factors, but the detection method of the embodiment performs VT (visual inspection) under natural illumination after cleaning, cleaning and drying, and has small visual influence, more visual and recognizable defects and higher detection efficiency.
Example two
Second embodiment is a further description of the first embodiment, the same components are not repeated herein, please refer to fig. 1-2, and the detailed step of step S1 is:
s11: placing a component on an upper thread station 1; in the step S11, the existing traveling mechanism is adopted to stably place the component on the upper thread station 1 to wait for the processing of workers;
s12: the surface of the component is scrubbed by cotton cloth dipped with an organic solvent to remove most of oil stains on the surface of the component; the cotton cloth is non-fluffy, so that the cotton threads on the cotton cloth are prevented from being hung on the surface of the component in the scrubbing process to cause new pollution;
preferably, the organic solvent is conventional absolute ethanol or gasoline.
EXAMPLE III
Embodiment three is a further description of embodiment one, and the same components are not repeated herein, please refer to fig. 1-2, and the detailed step of step S2 is:
s21: moving the component into a first water tank 2 filled with water machine deoiling liquid; step S21, placing the component in the first water tank 2 by using a traveling mechanism, so that the component is completely covered by the hot deionized water in the first water tank 2;
s22: clean compressed air is filled into the first water tank 2 to stir the water-based degreasing liquid; meanwhile, the water-based degreasing liquid is continuously replaced by the circulating filter 10, so that the water-based degreasing liquid obtained in the first water tank 2 is fully circulated, and the cleaned oil stains are continuously collected in the circulating process; preventing secondary pollution.
Ultrasonic waves may also be applied to the first water tank 2 in step S22 to enhance the degreasing force and degreasing efficiency.
According to the amount of greasy dirt on the surface of the component, the following different water-based degreasing liquids can be selected:
1. self-prepared alkaline degreasing fluid is selected when oil stains are more
The main components of the composition comprise:
when the self-prepared alkaline degreasing liquid is used as the water-based degreasing liquid, the temperature is ensured to be 70-90 ℃, and the cleaning time is 20-30 min.
2. Selecting finished water-based degreasing fluid when oil contamination is low
The model number is: TURCO 4215NC-LT 45-60 g/L
When the finished water-based degreasing liquid is adopted as the water-based degreasing liquid, the temperature is ensured to be 45-55 ℃, and the cleaning time is 10-20 min.
When in use, the self-matched alkaline degreasing fluid can be selected for pre-degreasing according to the amount of oil stains, and then the finished water-based degreasing fluid is used for fine degreasing.
Example four
The fourth embodiment is a further description of the first embodiment, and the same components are not repeated here, please refer to fig. 1-2, and the detailed step of step S3 is:
s31: moving the member into a second water tank 3 containing hot deionized water; in the step S31, the component is placed in the second water tank 3 by using a traveling mechanism, so that the component is completely covered by the hot deionized water in the second water tank 3;
s32: filling clean compressed air into the second water tank 3 to stir the hot deionized water;
the temperature of the hot deionized water is kept between 40 and 60 ℃; the resistivity of the deionized water is more than or equal to 100000 omega cm; the stirring time is controlled to be 0.5-1 min.
The detailed step of step S4 is:
s41: moving the member into a third water tank 4 containing cold deionized water; in the step S41, the component is placed in the third water tank 4 by using a traveling mechanism, so that the component is completely covered by the cold deionized water in the third water tank 4;
s42: filling clean compressed air into the third water tank 4 to stir the cold deionized water;
the temperature of the cold deionized water is normal temperature, namely the temperature of the cold deionized water is consistent with the room temperature; the resistivity of the deionized water is more than or equal to 100000 omega cm; the stirring time is controlled to be 0.5-1 min.
EXAMPLE five
Embodiment five is a further description of embodiment one, and the same components are not repeated herein, please refer to fig. 1-2, and the detailed step of step S5 is: after the component is far away from the cold deionized water, a water film is formed on the surface of the component; if the water film is complete and continuous within a certain time, the oil stain on the surface of the component is judged to be completely removed; if the water film is shrunk and broken within a certain time, determining that the oil stain on the surface of the component is not completely removed, and returning to the step S2 to carry out oil removal treatment again; namely, a travelling mechanism is adopted to lift the component out of the water surface, and the component is observed by naked eyes; the certain time is preferably within 30 seconds.
EXAMPLE six
The sixth embodiment is a further description of the first embodiment, and the same components are not repeated here, please refer to fig. 1-2, and the detailed step of step S6 is:
s61: moving the member into a fourth tank 5 containing an acidic cleaning solution; step S61, placing the component in the fourth water tank 5 by using a traveling mechanism, so that the component is completely covered by the acidic cleaning solution in the fourth water tank 5;
s62: filling clean compressed air into the fourth water tank 5 to stir the acid cleaning solution, and continuously replacing the acid cleaning solution by adopting a circulating filter 10; the acid cleaning solution is contacted with the component to erode residual impurities on the component, and simultaneously, the acid etching is carried out on the weld joint defect to expose the weld joint defect.
The acidic cleaning solution comprises the following components: 15 to 25 percent of nitric acid and 8 to 10 percent of hydrofluoric acid; and the temperature of the acidic cleaning solution is kept at normal temperature, and the stirring time is controlled to be 5-10 min.
The specific gravity of the acid in the nitric acid is 1.42 g/ml; the specific gravity of the acid in the hydrofluoric acid is 1.1 g/ml.
EXAMPLE seven
Embodiment seven is a further description of embodiment one, and the same components are not repeated herein, please refer to fig. 1-2, and the detailed step of step S7 is:
s71: moving the member into a fifth water tank 6 containing cold deionized water; in the step S71, the component is placed in the fifth water tank 6 by using a travelling crane mechanism, so that the component is completely covered by the cold deionized water in the fifth water tank 6;
s72: filling clean compressed air into the fifth water tank 6 to stir the cold deionized water;
the temperature of the cold deionized water is normal temperature, the resistivity of the deionized water is more than or equal to 100000 omega-cm, and the cleaning time is kept between 0.5 and 1 min.
Example eight
Embodiment eight is a further description of embodiment one, and the same components are not repeated herein, please refer to fig. 1-2, and the detailed step of step S8 is:
s81: moving the member into the empty slot 7; step S81, placing the component in the empty groove 7 by adopting a travelling crane mechanism; a small amount of foreign matters are adhered to the surface of a component in the lifting process of the traveling mechanism and hanging dust generated by chemical reaction in the cleaning process of acid cleaning liquid;
s82: after the components are placed stably, a high-pressure water gun connected with clean compressed air is adopted to spray and clean the components; thereby achieving the purpose of cleaning; preferably, the pressure of the clean compressed air is kept between 0.3 and 0.5 MPa.
The water used by the high-pressure water gun is cold deionized water; the resistivity of the cold deionized water is more than or equal to 100000 omega cm.
Example nine
Embodiment nine is a further description of embodiment one, and the same components are not repeated herein, please refer to fig. 1-2, and the detailed step of step S9 is:
s91: moving the member into a hot air drying tank 8; step S91 is to place the component in the hot air drying tank 8 by using a traveling mechanism; hot air for drying is introduced into the hot air drying groove 8;
s92: contacting the member with hot air to dry the member; if the component has welding defects, the welding defects can return exudation liquid in the drying process, the liquid flows out gradually, and traces are left in the drying process for the inspection of the step S10;
the temperature of the hot air is kept at 60-80 ℃, and the drying time is controlled at 20-30 min.
In step S10, the component is moved to the offline VT inspection station 9 by the traveling mechanism and inspected.
Example ten
In the first to ninth embodiments, a system for cleaning and inspecting welding defects of large stainless steel welding components is adopted, and comprises an online station 1, a first water tank 2, a second water tank 3, a third water tank 4, a fourth water tank 5, a fifth water tank 6, an empty tank 7, a hot air drying tank 8 and an offline VT inspection station 9 which are sequentially arranged to form a complete detection assembly line; the first water tank 2 and the fourth water tank 5 are externally connected with a circulating filter 10; and a clean compressed air pipeline 11 is arranged outside the system, the clean compressed air pipeline 11 is respectively communicated with the first water tank 2, the second water tank 3, the third water tank 4, the fourth water tank 5 and the fifth water tank 6 through branches, and valves are arranged on the branches.
The whole process of cleaning and washing comprises hot air drying treatment which is completely finished on a washing production line; the labor capacity of the staff is reduced, and the potential safety hazard is reduced.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (10)
1. A method for cleaning and checking welding defects of large stainless steel welding components is characterized by comprising the following steps:
s1: cleaning the component by using an organic solvent, and preliminarily removing oil stains on the surface of the component;
s2: thoroughly removing oil stains on the surface of the component by adopting water-based degreasing liquid;
s3: cleaning the component by hot deionized water, and preliminarily removing deoiling liquid on the surface of the component;
s4: cleaning the component by cold deionized water, and removing the deoiling liquid remained on the surface of the component;
s5: checking whether the oil removal on the surface of the component is complete or not by adopting a water film non-breaking method; if the water film is not broken and shrunk continuously, performing step S6; if the water film is broken, repeating the steps S2-S5 until the water film is continuous;
s6: removing residual impurities on the component by using acid washing cleaning liquid, and simultaneously exposing a welding area;
s7: cleaning the component with cold deionized water to remove the cleaning liquid on the component;
s8: spraying and cleaning the component by a high-pressure water gun to remove foreign matters and dust adhered on the component;
s9: drying the component after spray cleaning;
s10: visually inspecting the entire component surface;
when no residual liquid seeps out of the welding area, judging that the welding quality of the component is qualified; and when the residual liquid seeps out of the welding area, judging that the welding quality of the component is not qualified.
2. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 1, wherein the detailed steps of the step S1 are as follows:
s11: placing the component on an upper thread station;
s12: the surface of the component is scrubbed by cotton cloth dipped with an organic solvent to remove most of oil stains on the surface of the component;
the organic solvent is absolute ethyl alcohol or gasoline.
3. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 1, wherein the detailed steps of the step S2 are as follows:
s21: moving the component to a first water tank filled with water machine deoiling liquid;
s22: filling clean compressed air into the first water tank to stir the water-based degreasing liquid; meanwhile, the water-based degreasing fluid is continuously replaced by adopting a circulating filter.
4. The method for cleaning and inspecting a large-sized stainless steel welded component for weld defects according to claim 3, wherein ultrasonic waves are applied to the first water tank in step S22 to increase the degreasing force.
5. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 1, wherein the detailed steps of the step S3 are as follows:
s31: moving the member to a second water tank containing heated deionized water;
s32: filling clean compressed air into the second water tank to stir the hot deionized water;
the temperature of the hot deionized water is kept between 40 and 60 ℃;
the detailed step of step S4 is:
s41: moving the member to a third water tank containing cold deionized water;
s42: filling clean compressed air into the third water tank to stir the cold deionized water;
the temperature of the cold deionized water is normal temperature.
6. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 5, wherein the detailed steps of the step S5 are as follows: after the component is far away from the cold deionized water, a water film is formed on the surface of the component; if the water film is complete and continuous within a certain time, the oil stain on the surface of the component is judged to be completely removed; if the water film is shrunk and broken within a predetermined time, it is determined that the oil stain on the surface of the member is not completely removed, and the process returns to step S2 to perform the oil removal process again.
7. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 1, wherein the detailed steps of the step S6 are as follows:
s61: moving the member to a fourth tank containing an acidic cleaning solution;
s62: filling clean compressed air into the fourth water tank to stir the acid cleaning solution, and continuously replacing the acid cleaning solution by adopting a circulating filter; the acid cleaning solution is contacted with the component to erode residual impurities on the component, and simultaneously, the expansion acid erosion is carried out on the welding seam defect to expose the welding seam defect;
the acidic cleaning solution comprises the following components: 15 to 25 percent of nitric acid and 8 to 10 percent of hydrofluoric acid;
the specific gravity of the acid in the nitric acid is 1.42 g/ml; the specific gravity of the acid in the hydrofluoric acid is 1.1 g/ml.
8. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 1, wherein the detailed steps of the step S7 are as follows:
s71: moving the member to a fifth water tank containing cold deionized water;
s72: filling clean compressed air into the fifth water tank to stir the cold deionized water;
the temperature of the cold deionized water is normal temperature;
the detailed step of step S8 is:
s81: moving the member into the void;
s82: spraying and cleaning the component by adopting a high-pressure water gun connected with clean compressed air;
the water used by the high-pressure water gun is cold deionized water.
9. The method for cleaning and inspecting the welding defects of the large-scale stainless steel welding components according to claim 1, wherein the detailed steps of the step S9 are as follows:
s91: moving the member into a hot air drying tank;
s92: contacting the member with hot air to dry the member; if the component has welding defects, the welding defects can return exudation liquid in the drying process, the liquid flows out gradually, and traces are left in the drying process;
the temperature of the hot air is kept at 60-80 ℃, and the drying time is controlled at 20-30 min.
10. A system for cleaning, cleaning and inspecting welding defects of large stainless steel welding components is characterized by comprising an online station, a first water tank, a second water tank, a third water tank, a fourth water tank, a fifth water tank, an empty tank, a hot air drying tank and an offline VT inspection station which are sequentially arranged; the first water tank and the fourth water tank are externally connected with a circulating filter; the device is characterized by further comprising a clean compressed air pipeline, wherein the clean compressed air pipeline is respectively communicated with the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank through branch circuits, and valves are arranged on the branch circuits.
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