CN110549069B - Method for repairing damage of anti-icing pipeline of engine air inlet - Google Patents
Method for repairing damage of anti-icing pipeline of engine air inlet Download PDFInfo
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- CN110549069B CN110549069B CN201910638698.2A CN201910638698A CN110549069B CN 110549069 B CN110549069 B CN 110549069B CN 201910638698 A CN201910638698 A CN 201910638698A CN 110549069 B CN110549069 B CN 110549069B
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Abstract
The invention discloses a method for repairing damage of an anti-icing pipeline of an engine air inlet, which comprises the following steps: (1) determining damage types of an anti-icing pipeline of an air inlet of an engine, wherein the damage types of the anti-icing pipeline comprise T-shaped joint damage and connecting bracket damage; (2) for T-shaped joint damage, firstly designing an anti-icing pipeline welding clamp, placing the anti-icing pipeline on the anti-icing pipeline welding clamp, and after removing the damaged part of the T-shaped joint, welding a repair part a on the damaged T-shaped joint; (3) for the damage of the connecting bracket, removing the damaged part of the connecting bracket, and welding a repairing piece b on the connecting bracket with the damage removed; (4) and (4) checking and repairing: and carrying out crack inspection, color inspection and nondestructive inspection on the repair area. The repairing method has a good repairing effect on damage of the T-shaped joint and damage of the connecting bracket of the anti-icing pipeline of the air inlet passage of the engine.
Description
Technical Field
The invention belongs to the technical field of airplane maintenance, and particularly relates to a method for repairing damage of an anti-icing pipeline of an engine inlet.
Background
When an airplane flies in the atmosphere, the airplane may freeze, frost, fog and the like as long as the airplane encounters high humidity or low temperature. The effects of icing on aircraft performance, efficiency and safety are manifold. Increased boost and reduced lift if icing, resulting in harmful vibrations; the atmospheric pressure instrument can not work normally; clamping the control surface; compromising the reception and transmission of radio signals, etc. The anti-icing system is critical to ensure safe flight of the aircraft.
The icing of the engine air inlet passage is the most dangerous condition in the icing of the airplane, which not only directly causes the damage of the appearance of the air inlet passage, reduces the thrust of the engine and increases the flight load, but also when the ice layer in the air inlet passage falls off, the ice layer enters the inside of the engine along with the air flow to damage the blades, so that the mechanical damage of the air compressor is caused, even the damage of the whole engine directly causes the flight accident. Therefore, engine anti-icing is important to ensure flight safety.
The air inlet channel works in a high vibration area, and the anti-icing structure of the air inlet channel can be seriously abraded after a long time, so that the anti-icing system is finally failed. Most of anti-icing structural materials in the air inlet channel are titanium alloys, and the integral structure is large and unrealistic to replace. The anti-icing pipeline of current engine intake duct includes anti-icing pipeline usually, locates a plurality of linking bridge and T type on the anti-icing pipeline and connects, and in repairing the rank to the intake duct, the damage can appear in the T type according to statistics 78% intake duct anti-icing pipeline in, and the damage can appear in the linking bridge in 35% intake duct anti-icing pipeline. Therefore, the damage of the connecting bracket and the damage of the T-shaped joint are repaired in situ, and the cost is greatly saved.
Disclosure of Invention
The invention aims to provide a method for repairing damage of an anti-icing pipeline of an engine air inlet, which has a good repairing effect on damage of a T-shaped joint and damage of a connecting bracket of the anti-icing pipeline of the engine air inlet.
The above object of the present invention is achieved by the following technical solutions: a method for repairing damage of an anti-icing pipeline of an engine air inlet comprises the following steps:
(1) determining damage types of an anti-icing pipeline of an engine air inlet, wherein the anti-icing pipeline of the engine air inlet comprises an anti-icing pipeline, a connecting support and a T-shaped joint, and the damage types of the anti-icing pipeline comprise damage of the T-shaped joint and damage of the connecting support;
(2) for T-shaped joint damage, firstly designing an anti-icing pipeline welding clamp, placing the anti-icing pipeline on the anti-icing pipeline welding clamp, removing a damaged part of the T-shaped joint, and then welding a repair part a on the damaged T-shaped joint, wherein the shape, the size and the material of the repair part a are the same as those of the repair part a before the damaged part of the T-shaped joint is removed and is not damaged;
(3) for the damage of the connecting bracket, removing the damaged part of the connecting bracket, and welding a repairing piece b on the damaged connecting bracket, wherein the shape, the size and the material of the repairing piece b are the same as those of the connecting bracket before the damaged part is removed;
(4) and (4) checking and repairing: and carrying out crack inspection, color inspection and nondestructive inspection on the repair area.
In the method for repairing damage of the anti-icing pipeline of the engine air inlet, the steps of:
preferably, the anti-icing pipeline of the engine inlet in the step (1) is a V2500 engine inlet anti-icing pipeline; the damage of the T-shaped joint in the step (1) comprises abrasion of the T-shaped joint in the radial direction, and the damage of the connecting support comprises gasket abrasion of the connecting support, abrasion of the connecting support and fracture of the connecting support.
Preferably, when the damaged part of the T-shaped joint is removed in the step (2), cutting is performed at a set position, the distance between the cutting surface of the T-shaped joint and the radial center plane of the anti-icing pipeline is 4.0 inches during cutting, and after the damaged part of the T-shaped joint is removed, the damaged part is cleaned by butanone and inspected by a 10-time magnifier, so that no crack is formed at the cut part.
Preferably, in step (2) anti-icing pipeline welding jig includes base, hold assembly, stand and high locator, the hold assembly is two and is located respectively the both ends of base, the hold assembly is including being used for the centre gripping the last semicircle and the lower semicircle of the connection of dismantling of anti-icing pipeline, the stand is located between two hold assembly, the stand includes a riser and locates the fixed flat board at riser top, be equipped with on the fixed flat board and be used for fixing the opening that the T type connects, high locator is located in the T type connects for before cutting and after the welding the high location that the T type connects.
Preferably, the height positioner is a cylinder with a vent hole in the middle, and the vent hole is used for introducing protective gas during welding of the T-shaped joint.
Preferably, the step (3) of removing the damaged portion of the connecting bracket means that the upper half portion of the connecting bracket is cut and removed until the cuts at the two ends are flush with the radial center line of the anti-icing pipeline.
Preferably, step (3) is performed to polish the damaged part of the connecting bracket smoothly after removing the damaged part, but the connecting bracket cannot be cut and polished excessively so as to prevent damage to the anti-icing pipeline, and after the damage of the connecting bracket is removed, the connecting bracket needs to be subjected to a fluorescence permeation inspection with 3-level sensitivity so as to ensure no damage sign of the anti-icing pipeline.
Preferably, the repair part a in the step (2) is cut from a new T-shaped joint which is the same as the damaged T-shaped joint before damage, the repair part b in the step (3) is cut from a new connecting bracket which is the same as the damaged connecting bracket before damage, and after the cutting, the repair part is cleaned by butanone and inspected by a 10-fold magnifier to ensure that no crack exists at the cutting position.
Preferably, the material adopted in the welding in the step (2) and the step (3) is a titanium alloy material, before the welding, the repair part a in the step (2) or the repair part b in the step (3) is confirmed to be matched with the cut to be welded, and the repair area is completely purified by argon gas; the welding in the step (2) includes first spot welding to prevent the repair part a from being deformed during the welding process, or the welding in the step (3) includes first spot welding to prevent the repair part b from being deformed during the welding process, then the welding is continued until the welding spot is covered, and after the welding, the polishing is performed until the step difference between the welding area and the surrounding surface is +0.002 to-0.000 inches, and the surface roughness is 125RA and above.
Preferably, the crack inspection in the step (4) is a visual inspection of the repair area by using a tenfold magnifier to ensure that no crack exists, the color inspection comprises welding oxidation inspection, only bright silver, gold and light blue are qualified, other colors are not qualified, and the nondestructive inspection is to finally ensure that the welding is free of defects by fluorescence penetrant inspection and radiographic inspection.
Compared with the prior art, the invention has the following advantages:
(1) the anti-freezing pipeline welding clamp designed by the invention simplifies the difficult problem of welding positioning;
(2) the invention uses the pre-welding process of spot welding to ensure that the anti-icing pipeline does not deform after welding;
(3) the repairing method can ensure that the repaired anti-icing pipeline is accurately positioned and well connected, and the seaworthiness is met;
(4) the welding maintenance scheme (CMM-711100-Repair028) of the T-shaped joint can save 50% of welding time, save 75% of material cost and save manpower cost;
(5) the repairing method can be applied to the aircraft maintenance industry on a large scale.
Drawings
FIG. 1 is a schematic view showing the wear of the T-shaped joint of the inlet anti-icing duct in examples 1 to 3;
FIG. 2 is a schematic view showing damage to a connecting bracket of the inlet deicing pipeline in embodiment 2-3;
FIG. 3 is a schematic diagram of a damaged cutting line of a T-shaped joint of an anti-icing pipeline of an air inlet in the embodiment 1-3, wherein the left drawing is a side view and the right drawing is a front view;
FIG. 4 is a schematic diagram showing the damage cutting of the inlet deicing pipeline connecting bracket in embodiment 2-3;
FIG. 5 is a schematic view showing the state in which the anti-icing pipe welding jig clamps the anti-icing pipe in examples 1 to 3;
FIG. 6 is a schematic structural view of an anti-icing pipe welding jig according to embodiments 1 to 3;
FIG. 7 is a schematic view showing the state of the anti-icing duct welding jig according to embodiments 1 to 3.
Detailed Description
Example 1
The method for repairing damage to the anti-icing pipeline of the engine air inlet comprises the following steps:
(1) determining damage type of anti-icing pipeline of engine air inlet
The damage type is determined as the abrasion of the T-shaped joint of the anti-icing pipeline of the inlet passage (745, 3000, 515, 2039001) of the V2500 engine, and the abrasion of the T-shaped joint of the anti-icing pipeline of the inlet passage is mainly reflected in the abrasion of the radial direction of the joint, as shown in figure 1.
(2) Removing damage to T-shaped joint of anti-icing pipeline
The anti-icing pipeline is clamped on an anti-icing pipeline welding fixture, the damaged T-shaped joint is cut off by a standard tool (a cutting machine and the like), the cutting line is 4.0 inches away from the central plane of the anti-icing pipeline, and as shown in figure 3, a magnifying glass with the magnification of 10 times is used for confirming whether the cut is cracked or not after the cut is cleaned by using butanone cleaner.
As shown in fig. 5-7, anti-icing pipeline welding jig includes base 1, clamping part 2, stand 3 and height locator 4, clamping part 2 is two and is located the both ends of base 1 respectively, clamping part 2 is including the last semicircle and the lower semicircle that are used for the dismantlement of centre gripping anti-icing pipeline 5 to connect, stand 3 is located between two clamping part, stand 3 includes a riser and the fixed flat board of locating the riser top, be equipped with the opening that is used for fixed T type to connect on the fixed flat board, height locator 4 locates in the T type connects for before cutting and after the welding the height location that the T type connects.
The height positioner 4 is a cylinder with a vent hole in the middle, and the vent hole is used for introducing protective gas when the T-shaped joint is welded.
The anti-icing pipeline welding clamp can keep the angle of the anti-icing pipeline in the circumferential direction after welding; height in the vertical direction; levelness in the horizontal direction. Because a large amount of protective gas needs to be filled in during welding, the vent hole is arranged at the specific position of the clamp for filling the protective gas, and the welding quality is ensured.
(3) T-shaped joint for welding anti-icing pipeline
Clamping the anti-icing pipeline on an anti-icing pipeline welding clamp, and welding a repairing part a on the anti-icing pipeline, wherein the repairing part a is cut from a new T-shaped joint, the new T-shaped joint is the same as the damaged T-shaped joint before being damaged, the new T-shaped joint (No. 740-.
Before welding, it is confirmed that the new T-joint matches the cut and the repair area is completely purged with argon gas, and during welding, spot welding prewelding is performed in advance to prevent the parts from being deformed during welding, but the welding spot is finally covered by welding. After welding, the weld area is ground to a step of +0.002 to-0.000 inches from the surrounding surface to a surface roughness of 125RA or better.
(4) The inspection repair ensures that the repaired part is defect free.
The inspection and repair comprises three parts, wherein the first part is crack inspection, and a tenfold magnifier is used for visually inspecting a repair area to ensure that no crack exists; the second part is color inspection, namely titanium alloy welding oxidizability inspection, and only bright silver, gold and light blue are qualified, and other colors are unqualified; the third part is nondestructive testing, and finally ensures that the welding is free of defects through fluorescence penetration inspection and radiographic inspection.
Example 2
The method for repairing damage to the anti-icing pipeline of the engine air inlet comprises the following steps:
(1) determining damage type of anti-icing pipeline of engine air inlet
The damage types are abrasion of T-shaped joints of anti-icing pipelines and damage of anti-icing pipeline connecting brackets of an air inlet (part number 745, 3000, 515, 1913001) of a V2500 engine, as shown in FIG. 2, the damage of the anti-icing pipeline connecting brackets of the air inlet comprises abrasion of gaskets of the connecting brackets, abrasion of the connecting brackets, fracture of the connecting brackets and the like, as shown in FIG. 2.
(2) Removing damage to connecting bracket of anti-icing pipeline
The damaged portion of the connecting stent was carefully cut and the cut was polished flush with the outer surface of the anti-icing ring as shown in figure 4. Care should be taken here not to over cut and grind to prevent damage to the anti-icing line. After the connecting stent damage is removed, it needs to be subjected to a fluorescence penetrant inspection (grade 3 sensitivity) to ensure no damage to the anti-icing tubing.
(3) Removing damage to T-shaped joint of anti-icing pipeline
The anti-icing pipe was clamped to the anti-icing pipe welding jig (same as example 1), the damaged T-shaped joint was cut off with a standard tool, and after cleaning with a butanone cleaner, the cut was confirmed for cracks using a 10-fold magnifier.
Due to the height restrictions for the weldment, it is necessary to cut at a specific location with a cut line 4.0 inches from the center plane of the anti-icing ring, as shown in FIG. 3.
(4) Repair part b for manufacturing anti-icing pipeline connecting bracket
And (2) cutting by using a new connecting support (part number: 740-.
(5) And the welding of the anti-icing pipeline connecting bracket is to weld the repair part b on the anti-icing pipeline in a melting way. Welding rod materials: Ti-CP (AMS4951), anti-icing tube material: Ti-CP.
Before welding, it is to be confirmed that the repair pieces are matched to the cut and the repair area is to be completely purged with argon gas, and during welding, spot welding prewelding is performed in advance to prevent the parts from being deformed during welding, but the welding spot is finally covered by the welding. After welding, the weld area is ground to a step of +0.002 to-0.000 inches from the surrounding surface to a surface roughness of 125RA or better.
(6) T-shaped joint for welding anti-icing pipeline
The anti-icing pipeline is clamped on an anti-icing pipeline welding clamp (as shown in figures 5-6), and a repair part a is obtained from a new T-shaped joint (part number: 740-.
Before welding, it is confirmed that the new T-joint matches the cut and the repair area is completely purged with argon gas, and during welding, spot welding prewelding is performed in advance to prevent the parts from being deformed during welding, but the welding spot is finally covered by welding. After welding, the weld area is ground to a step of +0.002 to-0.000 inches from the surrounding surface to a surface roughness of 125RA or better.
(7) The inspection repair ensures that the repaired part is defect free.
The inspection and repair comprises three parts, wherein the first part is crack inspection, and a tenfold magnifier is used for visually inspecting a repair area to ensure that no crack exists; the second part is color inspection, namely titanium alloy welding oxidizability inspection, and only bright silver, gold and light blue are qualified, and other colors are unqualified; the third part is nondestructive testing, and finally ensures that the welding is free of defects through fluorescence penetration inspection and radiographic inspection.
Example 3
The method for repairing abrasion of the anti-icing pipeline of the air inlet passage of the engine comprises the following steps:
(1) the damage types of the anti-icing pipeline of the engine inlet are determined to be V2500 damage types of the T-shaped joint of the anti-icing pipeline and the wear of the bracket of the anti-icing pipeline, as shown in the figure 1 and the figure 2 (745, 3400, 507, 4154001).
(2) Removing damage to connecting bracket of anti-icing pipeline
The damaged portion of the connecting bracket was carefully cut away and the cut was polished flush with the outer surface of the anti-icing ring, as shown in fig. 4. Care should be taken here not to over cut and grind to prevent damage to the anti-icing line. After the connecting stent damage is removed, it needs to be subjected to a fluorescence penetrant inspection (grade 3 sensitivity) to ensure no damage to the anti-icing tubing.
(3) Removing damage to T-shaped joint of anti-icing pipeline
The anti-icing tubing was clamped to an anti-icing tubing welding fixture (as shown in fig. 5-6), the damaged T-joint was cut with a standard tool, and the cut was checked for cracks using a 10-fold magnifier after cleaning with butanone cleaner.
Due to the height restrictions for the weldment, it is necessary to cut at a specific location with a cut line 4.0 inches from the center plane of the anti-icing ring, as shown in FIG. 3.
(4) Repair part b for manufacturing anti-icing pipeline connecting bracket
And cutting a new connecting bracket (part number: 740-.
(5) Welding anti-icing pipeline connecting support
The repair part b is fusion-welded to the anti-icing duct. Welding rod materials: Ti-CP (AMS4951), anti-icing tube material: Ti-CP.
Before welding, it is to be confirmed that the repair pieces are matched to the cut and the repair area is to be completely purged with argon gas, and during welding, spot welding prewelding is performed in advance to prevent the parts from being deformed during welding, but the welding spot is finally covered by the welding. After welding, the weld area is ground to a step of +0.002 to-0.000 inches from the surrounding surface to a surface roughness of 125RA or better.
(6) T-shaped joint for welding anti-icing pipeline
Clamping the anti-icing pipeline on an anti-icing pipeline welding clamp to cut a repair part a by adopting a new T-shaped joint (the part number: 740-3073-503 is the same as the size, the shape and the material of the damaged T-shaped joint), wherein the shape, the size and the material of the repair part a formed by cutting are the same as those of the repair part a before the damaged part of the T-shaped joint is removed and is not damaged, and the repair part a is welded on the anti-icing pipeline.
Before welding, it is to be confirmed that the repair piece a is matched with the cut and the repair area is to be completely purged with argon gas, and during welding, spot welding prewelding is performed in advance to prevent the parts from being deformed during welding, but the welding spot is finally covered by welding. After welding, the weld area is ground to a step of +0.002 to-0.000 inches from the surrounding surface to a surface roughness of 125RA or better.
(7) The inspection repair ensures that the repaired part is defect free.
The inspection and repair comprises three parts, wherein the first part is crack inspection, and a tenfold magnifier is used for visually inspecting a repair area to ensure that no crack exists; the second part is color inspection, namely titanium alloy welding oxidizability inspection, and only bright silver, gold and light blue are qualified, and other colors are unqualified; the third part is nondestructive testing, and finally ensures that the welding is free of defects through fluorescence penetration inspection and radiographic inspection.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. A method for repairing damage of an anti-icing pipeline of an engine air inlet is characterized by comprising the following steps:
(1) determining damage types of an anti-icing pipeline of an engine air inlet, wherein the anti-icing pipeline of the engine air inlet comprises an anti-icing pipeline, a connecting support and a T-shaped joint, and the damage types of the anti-icing pipeline comprise damage of the T-shaped joint and damage of the connecting support;
(2) for T-shaped joint damage, firstly designing an anti-icing pipeline welding clamp, placing the anti-icing pipeline on the anti-icing pipeline welding clamp, removing a damaged part of the T-shaped joint, and then welding a repair part a on the damaged T-shaped joint, wherein the shape, the size and the material of the repair part a are the same as those of the repair part a before the damaged part of the T-shaped joint is removed and is not damaged;
(3) for the damage of the connecting bracket, removing the damaged part of the connecting bracket, and welding a repairing piece b on the damaged connecting bracket, wherein the shape, the size and the material of the repairing piece b are the same as those of the connecting bracket before the damaged part is removed;
(4) and (4) checking and repairing: carrying out crack inspection, color inspection and nondestructive testing on the repaired area;
in step (2) anti-icing pipeline welding jig includes base, hold assembly, stand and high locator, hold assembly is two and is located respectively the both ends of base, hold assembly is including being used for the centre gripping the last semicircle and the lower semicircle of the connection of dismantling of anti-icing pipeline, the stand is located between two hold assembly, the stand includes a riser and locates the fixed flat plate at riser top, be equipped with on the fixed flat plate and be used for fixing the opening that the T type connects, high locator is located in the T type connects for before cutting and after the welding the high location that the T type connects.
2. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: the anti-icing pipeline of the engine air inlet in the step (1) is a V2500 engine air inlet anti-icing pipeline; the damage of the T-shaped joint in the step (1) comprises abrasion of the T-shaped joint in the radial direction, and the damage of the connecting support comprises gasket abrasion of the connecting support, abrasion of the connecting support and fracture of the connecting support.
3. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: and (3) when the damaged part of the T-shaped joint is removed in the step (2), cutting is carried out at a set position, the distance between the cutting surface of the T-shaped joint and the radial central plane of the anti-icing pipeline is 4.0 inches during cutting, after the damaged part of the T-shaped joint is removed, cleaning is carried out by using butanone, and then inspection is carried out by using a 10-time magnifier, so that no crack is formed at the cutting position.
4. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: the height positioner is a cylinder with a vent hole in the middle, and the vent hole is used for introducing protective gas when the T-shaped joint is welded.
5. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: and (4) removing the damaged part of the connecting support in the step (3) refers to cutting and removing the upper half part of the connecting support until the cuts at two ends are flush with the radial center line of the anti-icing pipeline.
6. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine as claimed in claim 5, wherein the method comprises the following steps: and (3) polishing smoothly after removing the damaged part of the connecting support, but not excessively cutting and polishing to prevent damage to the anti-icing pipeline, and performing 3-level sensitivity fluorescence permeation inspection on the connecting support after removing the damage of the connecting support to ensure no-damage signs of the anti-icing pipeline.
7. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: and (3) cutting the repair part a from a new T-shaped joint, wherein the new T-shaped joint is the same as the damaged T-shaped joint before the damaged T-shaped joint is damaged, cutting the repair part b from a new connecting support, wherein the new connecting support is the same as the damaged connecting support before the damaged connecting support is damaged, cleaning the new connecting support by using butanone after cutting, and checking by using a 10-time magnifier to ensure that the cut part has no crack.
8. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: the material adopted in the welding in the step (2) and the step (3) is a titanium alloy material, before welding, the repair part a in the step (2) or the repair part b in the step (3) is confirmed to be matched with the cut to be welded, and the repair area is completely purified by argon; the welding in the step (2) includes first spot welding to prevent the repair part a from being deformed during the welding process, or the welding in the step (3) includes first spot welding to prevent the repair part b from being deformed during the welding process, then the welding is continued until the welding spot is covered, and after the welding, the polishing is performed until the step difference between the welding area and the surrounding surface is +0.002 to-0.000 inches, and the surface roughness is 125RA and above.
9. The method for repairing damage to the anti-icing pipeline of the air inlet of the engine according to claim 1, which is characterized in that: and (4) visually inspecting the repaired area by using a ten-fold magnifier to ensure no crack in the crack inspection in the step (4), wherein the color inspection comprises welding oxidation inspection, only bright silver, golden and light blue are qualified, other colors are not qualified, and the nondestructive inspection is to finally ensure that the welding is free of defects through fluorescence penetrant inspection and radiographic inspection.
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| CN113068421B (en) * | 2009-07-31 | 2012-03-14 | 中国人民解放军第五七二0工厂 | In-situ high-frequency induction brazing method for guide pipe in airplane repair |
| CN102554550A (en) * | 2010-12-20 | 2012-07-11 | 广东惠州天然气发电有限公司 | Method for rapidly repairing defects of finned tube module of waste heat boiler |
| CN103028887A (en) * | 2012-11-23 | 2013-04-10 | 南通太平洋海洋工程有限公司 | Method for replacing and welding diagonal-bracing steel tube of ocean engineering crane arm support |
| CN106988291A (en) * | 2017-03-29 | 2017-07-28 | 中国海洋石油总公司 | The method that jacket is repaired at sea |
| CN109514173A (en) * | 2018-11-23 | 2019-03-26 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of restorative procedure of stainless steel material conduit outer damage |
| CN109975359A (en) * | 2019-02-25 | 2019-07-05 | 大唐湘潭发电有限责任公司 | A kind of water-cooling wall of power boiler Quick overhaul technique |
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