CN113714606B - TIG fusion repair process method for defects of laser welding joint - Google Patents
TIG fusion repair process method for defects of laser welding joint Download PDFInfo
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- CN113714606B CN113714606B CN202010454117.2A CN202010454117A CN113714606B CN 113714606 B CN113714606 B CN 113714606B CN 202010454117 A CN202010454117 A CN 202010454117A CN 113714606 B CN113714606 B CN 113714606B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to a fusion repair process method, and particularly relates to a TIG fusion repair process method for laser welding joint defects. It includes: step 1: simulating welding; and 2, step: cleaning; and 3, step 3: fixing and installing a camera; and 4, step 4: introducing argon; and 5: a welder uses a self-made lengthened welding gun to weld the repair welding, and the minimum current and the maximum current are respectively planned to weld the test piece, wherein the gas flow of a nozzle is 10-15L/min; and 6: detecting; and 7: inspecting defects; and 8: and (3) performing real welding and repair welding, wherein the method performs real welding, and for the defects in the welding, repair welding is performed on the defects corresponding to the real welding seams by using a welding seam repair process. The invention has the following effects: gas protection of the welding line and the adjacent base metal in the welding process is carried out to prevent oxidation; the welding process is stable, the heat input is low, the quality of the welding seam after fusion repair is good, meanwhile, the shape of the welding seam is improved, the stress concentration of the root is reduced, and the quality of the welding seam is ensured.
Description
Technical Field
The invention belongs to a fusion repair process method, and particularly relates to a TIG fusion repair process method for a laser welding joint defect.
Background
The safe storage of the spent fuel assembly is a major concern in the nuclear power industry, and the spent fuel storage grillwork is used as the most main equipment for storing the spent fuel assembly by a wet method and is widely applied to nuclear power plants and post-treatment plants. Along with the rapid development of the nuclear power industry in China, the market demand of a spent fuel storage grillwork is huge, at present, the localization of spent fuel storage grillwork equipment is completed, and a new requirement is provided for the structural form of a novel spent fuel storage grillwork in the manufacturing process.
The novel spent fuel storage framework is formed by adopting a structure that modularized storage sleeves are welded and connected through connecting plates and then welded and fixed through lower ends and surrounding fixing components, and the storage sleeves are assembled and welded as shown in figure 1. The storage sleeve consists of a square tube, an outer cladding and an inner cladding.
The connecting plate and square tube welding structure are shown in figure 2, the welding seam is positioned in the R corner area of the square tube, and the welding seam is paired to have the following problems:
a) After the square tube is formed, the excircle angle of the R area is not easy to ensure uniform size and no deviation;
b) Because the connecting plate is thin, edges on two sides along the length direction need to be chamfered and are matched and attached with the outer circular corners of the R area of the square pipe, the chamfering difficulty of the edges on the two sides of the connecting plate is high, and the size is not easy to ensure the uniformity in the whole length range;
c) The height of the square tube is about 4 meters, and the flatness and the verticality are not easy to guarantee after forming, so that the square tube is distorted and the like.
Above reasons all can lead to connecting plate and square pipe group to assemble and can not closely laminate, appear certain clearance, and laser welding is to the group clearance very sensitive, is generally less than 0.1mm, if surpass this range after-welding easily produce not fuse, root shrink groove defect that contracts at the welding seam root.
Because the height of the product is about 4 meters, if the equipment is vertically welded during laser welding, defects (undercut, incomplete fusion and root shrinkage and shrinkage) appear after the laser welding, particularly back weld seams cannot be directly welded and repaired by manual welding. The existence of root defects easily generates stress concentration, and the stress concentration has adverse effect on the fatigue performance of the joint.
Disclosure of Invention
The invention provides a TIG fusion repair process method for the defects of a laser welding joint aiming at the defects of the prior art, and the method mainly solves the problem that the surface defects of the laser welding joint are eliminated by adopting the TIG fusion repair process method. The TIG welding has the advantages of concentrated arc energy, good stability in the welding process, small welding deformation and the like, so that the defects on the back of the laser welding joint are eliminated by utilizing TIG fusion repair welding, the stress concentration degree of the joint is reduced, and the fatigue performance of the joint is improved.
The invention is realized by the following steps: a TIG fusion repair process method for defects of laser welding joints comprises the following steps:
step 1: simulated welding
Step 2: cleaning;
and step 3: fixing and installing a camera;
and 4, step 4: introducing argon;
and 5: a welder uses a self-made lengthened welding gun to weld the repair welding, and the minimum current and the maximum current are respectively planned to weld the test piece, wherein the gas flow of a nozzle is 10-15L/min;
and 6: detecting, namely performing visual and liquid permeation detection on the TIG fusion repair area according to NB/T20003.7-2010 and NB/T20003.4-2010 respectively, and judging the weld joint to be qualified if the result shows that the repair welding weld joint meets the relevant standard requirements; if the result shows that the product is unqualified, carrying out defect inspection;
and 7: defect inspection, namely cutting metallographic and intercrystalline corrosion samples of the joints after the fusion repair of different defects, respectively measuring the minimum and maximum current fusion repair weld penetration by adopting a metallographic method, respectively measuring the simulated root shrinkage and non-fusion defects of the weld of a test piece, completely eliminating the simulated defects of the welds of the square tube and the connecting plate after the TIG fusion repair of the maximum and minimum currents of a product, and recording all processes of the fusion repair weld without new defects;
and step 8: and (3) performing real welding and repair welding, wherein the method performs real welding, and for the defects in the welding, repair welding is performed on the defects corresponding to the real welding seams by using a welding seam repair process.
The TIG fusion repair process method for the defects of the laser welding joints is characterized in that the step 1 comprises the steps of,
and adopting a connecting plate and a square tube welding test piece which have the same specification, the same material and the same structure as the product to perform simulated welding.
The TIG fusion repair process method for the defects of the laser welding joints is characterized in that the step 1 comprises the steps of firstly welding the connecting plate and the square pipe by laser welding, and manufacturing root shrinkage grooves with the depth of about 0.5-0.6 mm and non-fusion simulation defects with the depth of about 0.3mm in the welding seams of the test pieces.
The TIG fusion repair process method for the laser welding joint defects comprises the steps of removing oil stains, surface oxides and metal steam residual pollutants in welding defect areas after laser welding of the joints, cleaning the parts to be fused by using a steel wire brush, and wiping the parts to be fused by using an organic solvent.
The TIG fusion repair process method for the defects of the laser welding joints is characterized in that the organic solvent is acetone or absolute ethyl alcohol.
The TIG fusion repair process method for the defects of the laser welding joints is characterized in that the step 3 comprises the steps of fixing a test piece, placing the test piece at a position 4-4.5 m away from a welder, and placing a camera group at the front end of an area to be fused and repaired.
The TIG fusion repair process method for the defects of the laser welding joints is characterized in that the step 4 comprises the steps of fixing a gas protection device on the back of a welding seam of a to-be-fused and repaired position, introducing argon gas, ensuring that the purity requirement is not less than 99.99 percent, the gas flow is 15-20L/min, and ensuring that the protection device is tightly attached to a test piece to avoid the influence of gas leakage on the protection effect.
In the TIG fusion repair process for laser welding joint defects, the step 5 includes observing the alignment position of the welding gun and the welding seam and the distance between the welding gun and the nozzle through a display screen during welding, and adjusting the angle of the welding gun to ensure that the fusion repair position is in a set area so as to avoid damaging adjacent base metals.
The invention has the following effects: 1) The problem that the conventional TIG welding gun cannot be adopted for carrying out fusion repair due to structural space limitation is solved by modifying the conventional TIG welding gun;
2) By manufacturing a group of camera combination, multi-angle real-time observation ensures that the welding speed and the angle of a welding gun are adjusted in time in the welding process;
3) Manufacturing a special gas protection device to perform gas protection on a welding line and an adjacent base metal in a welding process so as to prevent oxidation;
4) The TIG fusion repair is utilized to eliminate the defects after laser welding, the welding process is stable, the heat input is low, the quality of the welding seam after fusion repair is good, meanwhile, the shape of the welding seam is improved, the stress concentration at the root is reduced, and the quality of the welding seam is further ensured.
Drawings
FIG. 1 illustrates a spent fuel storage grid assembly welding process;
FIG. 2 shows a welding structure of a connecting plate and a square tube;
FIG. 3 is a flow chart of a TIG fusion repair eliminating method for laser welding T-shaped joint back defects;
FIG. 4 is a schematic structural view of TIG fusion repair;
FIG. 5 operation schematic diagram of TIG fusion repair welding process
FIG. 6 is a photograph of the surface of a weld joint after TIG fusion repair of a connecting plate and a square tube
FIG. 7 is a metallographic photograph of a cross section of a connecting plate and a square tube weld after TIG fusion repair;
in the figure, 1, a welding gun 2, a connecting plate 3 and a square tube
Detailed Description
As shown in the attached figures 3-7, the TIG fusion repair process method for the defects of the laser welding joint comprises the following steps:
step 1: a connecting plate and a square tube welding test piece which are the same in specification, material and structure as the product are adopted for simulated welding, firstly, the connecting plate and the square tube are welded by laser welding, and a root shrinkage groove with the depth of about 0.5 mm-0.6 mm and an unfused simulation defect with the depth of about 0.3mm are manufactured in a welding seam of the test piece.
And 2, step: removing oil stains, surface oxides and residual pollutants of metal steam in a welding defect area after laser welding of the joint, cleaning a part to be welded and repaired by using a steel wire brush, and then wiping the part to be welded and repaired by using an organic solvent (acetone or absolute ethyl alcohol).
And step 3: fixing the test piece by adopting a special tool, and requiring the test piece to be placed at a position 4-4.5 m away from a welder, and placing the camera group at the front end of the area to be welded.
And 4, step 4: fixing a gas protection device on the back of a welding line of a part to be welded and repaired, introducing argon, wherein the purity requirement is not less than 99.99%, the gas flow is 15-20L/min, and the protection device is tightly attached to a test piece to avoid the influence of gas leakage on the protection effect.
And 5: a welder uses a self-made lengthened welding gun to weld the test piece, and the minimum current and the maximum current are respectively set for welding the test piece, wherein the flow of the nozzle gas is 10-15L/min. In the welding process, the alignment position of the welding gun and the welding seam and the distance between the welding gun and the nozzle are observed through a display screen, and the angle of the welding gun is adjusted to ensure that the fusion repair position is in a set area, so that the adjacent base metal is prevented from being damaged.
Step 6: visual and liquid permeation detection is carried out on the TIG fusion repair area according to NB/T20003.7-2010 and NB/T20003.4-2010 respectively, and the result shows that the repair welding seam meets the relevant standard requirements and is qualified.
And 7: and respectively cutting metallographic phase and intergranular corrosion samples of the joint after the fusion repair aiming at different defects (non-fusion and root shrinkage). And respectively measuring the minimum current fusion repair weld penetration and the maximum current fusion repair weld penetration by adopting a metallographic method. The simulated root shrinkage groove and the non-fusion defect of the welding seam of the test piece are overcome, the simulated defect of the welding seam of the square tube and the connecting plate is completely eliminated after the TIG fusion repair is carried out by adopting the maximum current and the minimum current of the product, and the fusion repair welding seam has no new defect. The sizes of simulation defects in the test piece and defects in actual products cannot be completely consistent, but the maximum depth of the weld defects of the test piece of the square tube and the connecting plate is greater than that of the weld defects of the products, and the TIG fusion repair of the weld joints of the test piece is the same as the method, parameters, positions and welding equipment of the weld joints of the products. Therefore, the defects of root shrinkage and non-fusion of the welding seam can be overcome by adopting a TIG fusion repair process for the square tube and the connecting plate of the product. The penetration of TIG fusion repair welding by adopting maximum and minimum currents is measured to be 0.70 mm-1.80 mm by a metallographic method. The welded joint and the heat affected zone are not subjected to microcrack and abnormal structure in metallographic detection, and the related requirements of NB/T20002.3-2013 are met. Through the detection of a welded-state intergranular corrosion test and a sensitized-state intergranular corrosion test, all samples have no intergranular corrosion tendency, and the related requirements of GB/T4334-2008 are met.
And 8: the result shows that the proposal of eliminating the defects of incomplete fusion and root shrinkage groove of the laser welding seam by TIG fusion repair welding is feasible.
And step 9: the TIG fusion repair welding method is applied to actual products to verify the effect, the whole laser welded product is horizontally placed, the position of a defect to be fused and repaired is marked, fusion repair welding is carried out by adopting the same scheme as that of a test piece, the forming quality of the welded weld surface is good, the weld is white and bright, no oxidation exists, the weld surface is smooth, the transition with an adjacent parent metal is smooth, visual detection is carried out according to NB/T20003.7-2010, and the result shows that the weld meets the requirements of relevant standards and is a qualified weld.
Claims (6)
1. A TIG fusion repair process method for laser welding joint defects is characterized by comprising the following steps:
step 1: simulated welding
And 2, step: cleaning;
and 3, step 3: fixing and installing a camera;
and 4, step 4: introducing argon;
and 5: a welder uses a self-made lengthened welding gun to weld the repair welding, and the minimum current and the maximum current are planned to weld the test piece respectively, wherein the gas flow of a nozzle is 10-15L/min;
and 6: detecting, namely performing visual and liquid permeation detection on the TIG fusion repair area according to NB/T20003.7-2010 and NB/T20003.4-2010 respectively, and judging the weld joint to be qualified if the result shows that the repair welding weld joint meets the relevant standard requirements; if the result shows that the product is unqualified, carrying out defect inspection;
and 7: detecting defects, namely cutting metallographic and intergranular corrosion samples of the joint after the fusion repair of different defects, respectively measuring the minimum current fusion repair weld penetration and the maximum current fusion repair weld penetration by adopting a metallographic method, respectively measuring the simulated root shrinkage and non-fusion defects of the weld of a test piece, completely eliminating the simulated defects of the weld of the square tube and the connecting plate after the TIG fusion repair is carried out by adopting the maximum current and the minimum current of a product, and recording all processes of the fusion repair weld without new defects;
and 8: the method comprises the steps of actually welding and repairing welding, wherein the actual welding is carried out by the method, and the defects corresponding to the actual welding seams are repaired by the process of welding the welding seams;
the step 1 comprises the following steps of,
adopting a connecting plate with the same specification, the same material and the same structure as the product to perform simulated welding with the square tube welding test piece;
the step 1 comprises the steps of firstly welding the connecting plate and the square pipe by laser welding, and manufacturing an unfused simulation defect with the root shrinkage groove depth of 0.5-0.6 mm and the depth of 0.3mm in a welding seam of a test piece.
2. The TIG (tungsten inert gas) fusion repair process method for defects of laser welding joints as claimed in claim 1, wherein the TIG fusion repair process method comprises the following steps: removing oil stains, surface oxides and residual pollutants of metal steam in a welding defect area after laser welding of the joint, cleaning a part to be welded and repaired by using a steel wire brush, and then wiping the part to be welded and repaired by using an organic solvent.
3. The TIG fusion repair process method for the defects of the laser welding joint as claimed in claim 2, characterized in that: the organic solvent is acetone or absolute ethyl alcohol.
4. The TIG (tungsten inert gas) fusion repair process method for defects of laser welding joints as claimed in claim 3, wherein the TIG fusion repair process method comprises the following steps: and step 3, fixing the test piece, wherein the test piece is required to be placed at a position 4-4.5 m away from a welder, and the camera group is placed at the front end of the area to be welded.
5. The TIG (tungsten inert gas) fusion repair process method for defects of laser welding joints as claimed in claim 4, wherein the TIG fusion repair process method comprises the following steps: and 4, fixing a gas protection device on the back of the welding seam of the part to be welded, introducing argon, wherein the purity requirement is not less than 99.99%, the gas flow is 15-20L/min, and the protection device is tightly attached to the test piece to avoid the influence of gas leakage on the protection effect.
6. The TIG (tungsten inert gas) fusion repair process method for defects of laser welding joints as claimed in claim 5, wherein the TIG fusion repair process method comprises the following steps: and 5, observing the alignment position of the welding gun and the welding seam and the distance between the welding gun and the nozzle through a display screen in the welding process, and adjusting the angle of the welding gun to ensure that the fusion repair position is in a set area so as to avoid damaging adjacent base metal.
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2020
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| JPS61253180A (en) * | 1985-05-01 | 1986-11-11 | Mitsubishi Heavy Ind Ltd | Tig arc welding method for repairing |
| CN1916225A (en) * | 2006-09-06 | 2007-02-21 | 天津大学 | Phase change jet melting method for improving fatigue property of welded structure |
| CN105312743A (en) * | 2015-10-30 | 2016-02-10 | 长治清华机械厂 | On-site repair welding method for 5A06 aluminum barrel finished product welding joint stress corrosion crack |
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