CN118123301A - Welding process for repairing deep-melting fillet weld and crack of wear-resistant steel - Google Patents
Welding process for repairing deep-melting fillet weld and crack of wear-resistant steel Download PDFInfo
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- CN118123301A CN118123301A CN202410345061.5A CN202410345061A CN118123301A CN 118123301 A CN118123301 A CN 118123301A CN 202410345061 A CN202410345061 A CN 202410345061A CN 118123301 A CN118123301 A CN 118123301A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 106
- 239000010959 steel Substances 0.000 title claims abstract description 106
- 238000003466 welding Methods 0.000 title claims abstract description 94
- 238000002844 melting Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000008439 repair process Effects 0.000 claims abstract description 14
- 230000004927 fusion Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000011229 interlayer Substances 0.000 claims abstract description 7
- 238000003303 reheating Methods 0.000 claims abstract description 4
- 230000007547 defect Effects 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Abstract
The invention relates to the field of welding maintenance, in particular to a welding process for repairing a deep-melting fillet weld and a crack of wear-resistant steel, which comprises the following steps: s1, preheating a wear-resistant steel plate with cracks, removing the cracks by carbon planing, and preserving heat and cooling after carbon planing to prevent new cracks; s2, observing that cracks originate from the root or fusion line position of the fillet weld from the weld of the wear-resistant steel plate after the carbon planing, and expanding to the surface of the wear-resistant steel plate, so as to judge and analyze the cracks on the wear-resistant steel plate; s3, after the cracks are thoroughly removed, beveling, preheating, and repairing welding on the wear-resistant steel plate; s4, reheating after repair welding, and controlling the interlayer temperature of the wear-resistant steel plate; s5, performing repair welding on cracks on the wear-resistant steel plate by using a welding rod or welding wire with high N i content, and improving the crack resistance of the welding line; s6, optimizing the groove form of the deep-melting angle welding of the wear-resistant steel plate, and the invention can reduce the maintenance difficulty and improve the crack resistance.
Description
Technical Field
The invention relates to the field of welding maintenance, in particular to a welding process for repairing a deep-melting fillet weld and a crack of wear-resistant steel.
Background
At present, in the pile fixing chamber of the cylindrical pile leg wind power installation ship, wear-resistant steel plates are arranged, are attached to surrounding plates of the pile fixing chamber, and are deep-melting fillet welds, and because the surrounding plates of the pile fixing chamber are EH36 steel 40mm, the wear-resistant steel plates are wear-resistant steel plates NM400 and 40mm in thickness, so that the strength is high, the hardness is high, and hardening tissues are easy to produce during welding.
Because the wear-resistant steel plate is mounted on the coaming of the pile fixing chamber, and is limited by the welding position, a welder deviates to one side of the wear-resistant steel plate, the sight angle of the fusion line on the root and the groove side of the deep-melting fillet weld is poor, and the fusion line on the root and the groove side is easy to generate unfused defects during welding, so that the unfused defects can be expanded into cracks under the action of load and stress in the subsequent use process, and extend to the surface of the wear-resistant steel plate, so that the wear-resistant steel plate is invalid.
Therefore, it is necessary to provide a welding process for repairing the deep-melting fillet weld and the crack of the wear-resistant steel, which solves the above problems.
Disclosure of Invention
The invention provides a welding process for repairing a deep-melting fillet weld and cracks of wear-resistant steel, which aims to overcome at least one defect (deficiency) in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: a welding process for repairing a deep-melting fillet weld and a crack of wear-resistant steel comprises the following steps:
s1, preheating a wear-resistant steel plate with cracks, removing the cracks by carbon planing, and preserving heat and cooling after carbon planing to prevent new cracks;
S2, observing that cracks originate from the root or fusion line position of the fillet weld from the weld of the wear-resistant steel plate after the carbon planing, and expanding to the surface of the wear-resistant steel plate, so as to judge and analyze the cracks on the wear-resistant steel plate;
S3, after the cracks are thoroughly removed, beveling, preheating, and repairing welding on the wear-resistant steel plate;
s4, reheating the wear-resistant steel plate subjected to repair welding, and controlling the interlayer temperature of the wear-resistant steel plate;
s5, performing repair welding on cracks on the wear-resistant steel plate by using a welding rod or welding wire with high N i content, and improving the crack resistance of the welding line;
and S6, optimizing the groove form of the deep-melting angle welding of the wear-resistant steel plate.
Further, the step S1 includes the following steps:
s11, preheating the wear-resistant steel plate with cracks to 100 ℃, and removing the cracks by carbon planing;
s12, heat preservation cotton is used for covering cracks on the wear-resistant steel plate for heat preservation and cooling, and new cracks are prevented from being generated.
Further, the step S2 includes the following steps:
s21, observing the positions of root parts or weld lines of cracks originating from fillet welds and the positions of the surfaces of the wear-resistant steel plates;
S22, if the crack originates from the root of the fillet weld, determining that the root of the fillet weld has an unfused defect, and if the crack originates from the weld line position, determining that the weld line position has an unfused defect.
Further, in the step S3, the cracks on the wear-resistant steel plate are repair welded by means of manual welding or CO2 welding.
Further, in the step S4, the welded seam and the two sides of the wear-resistant steel plate subjected to repair welding are reheated to 120 ℃ at 50mm each, and the interlayer temperature of the wear-resistant steel plate is controlled to be 120-200 ℃.
Further, in the step S5, the welding rod or welding wire with high N i content is 307 welding rod or 307 flux-cored wire.
Further, in the step S6, the groove angle and the leg size of the deep-melting angle welding of the wear-resistant steel plate are enlarged under the condition that the effective size of the welding angle is unchanged, so that the groove depth is reduced.
Furthermore, the wear-resistant steel plate is of an arc-shaped structure and is uniformly attached to the wall plate of the pile fixing chamber.
Still further, the stake pocket wall panel is 40mm EH36 steel.
Further, the wear-resistant steel plate is NM400 wear-resistant steel plate, and the thickness is 40mm.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
According to the welding process for repairing the deep-melting fillet weld and the crack of the wear-resistant steel, the position and the trend of the crack are obtained by preheating and carbon planing the wear-resistant steel plate with the crack, and the welding process for repairing the deep-melting fillet weld and the crack of the wear-resistant steel is improved in the groove design, the welding construction and the crack repairing mode according to the position and the trend of the crack, so that the repairing problem of the welding crack of the wear-resistant steel is solved, the repairing difficulty is effectively reduced, and the crack resistance of the repaired crack is also improved.
Drawings
FIG. 1 is a flow chart of a welding process for repairing a deep-melting fillet weld and a crack of a wear-resistant steel according to the present invention.
Fig. 2 is a schematic view of the structure in which the abrasion resistant steel plate is disposed on the cylindrical leg according to the present invention.
Fig. 3 is a schematic view showing a partial structure of the abrasion-resistant steel plate provided on the cylindrical leg according to the present invention.
Fig. 4 is an enlarged view of the structure in which the abrasion resistant steel plate of the present invention is provided on the cylindrical leg.
Fig. 5 is a schematic view of the structure of the groove form before and after welding when not optimized in the present invention.
Fig. 6 is a schematic view of the structure of the groove form before and after welding after optimization in the present invention.
In the figure, 1 is a cylindrical pile leg, 2 is a coaming of a pile fixing chamber, and 3 is a wear-resistant steel plate.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, so to speak, the two elements are communicated internally. It will be understood by those of ordinary skill in the art that the terms described above are in the specific sense of the present invention. The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a welding process for repairing a deep-melting fillet weld and a crack of wear-resistant steel comprises the following steps:
s1, preheating a wear-resistant steel plate with cracks, removing the cracks by carbon planing, and preserving heat and cooling after carbon planing to prevent new cracks;
S2, observing that cracks originate from the root or fusion line position of the fillet weld from the weld of the wear-resistant steel plate after the carbon planing, and expanding to the surface of the wear-resistant steel plate, so as to judge and analyze the cracks on the wear-resistant steel plate;
S3, after the cracks are thoroughly removed, beveling, preheating, and repairing welding on the wear-resistant steel plate;
s4, reheating the wear-resistant steel plate subjected to repair welding, and controlling the interlayer temperature of the wear-resistant steel plate;
s5, performing repair welding on cracks on the wear-resistant steel plate by using a welding rod or welding wire with high N i content, and improving the crack resistance of the welding line;
and S6, optimizing the groove form of the deep-melting angle welding of the wear-resistant steel plate.
In step S1, the following steps are included:
s11, preheating the wear-resistant steel plate with cracks to 100 ℃, and removing the cracks by carbon planing;
s12, heat preservation cotton is used for covering cracks on the wear-resistant steel plate for heat preservation and cooling, and new cracks are prevented from being generated.
In step S2, the following steps are included:
s21, observing the positions of root parts or weld lines of cracks originating from fillet welds and the positions of the surfaces of the wear-resistant steel plates;
S22, if the crack originates from the root of the fillet weld, determining that the root of the fillet weld has an unfused defect, and if the crack originates from the weld line position, determining that the weld line position has an unfused defect.
In the step S3, the cracks on the wear-resistant steel plate are subjected to repair welding in a manual welding or CO2 welding mode, in the step S4, the welding seam and 50mm positions on two sides of the wear-resistant steel plate subjected to repair welding are reheated to 120 ℃, the interlayer temperature of the wear-resistant steel plate is controlled to be 120-200 ℃, in the step S5, a welding rod or welding wire with high N i content is 307 welding rods or 307 flux-cored wires, in the step S6, under the condition that the effective size of a welding angle is unchanged, the groove angle and the welding leg size of the deep-melting angle welding of the wear-resistant steel plate are enlarged, so that the groove depth is reduced.
Examples
As shown in fig. 2-4, the wear-resistant steel plates 3 are installed in the pile fixing chamber coaming 2 of the cylindrical pile leg 1 of the wind power installation ship, wherein the wear-resistant steel plates are of arc structures, 16 wear-resistant steel plates are arranged on the outer sides of the cylindrical pile leg in total, the wear-resistant steel plates are uniformly attached to the pile fixing chamber coaming, and because the wear-resistant steel plates are attached to the pile fixing chamber coaming and limited by welding positions, a welder is biased to one side of the wear-resistant steel plates, the sight angle of a fusion line on the root part and the groove side of a deep-melting fillet weld is poor, and unfused defects are easily generated on the fusion line on the root part and the groove side during welding.
In the prior art, as shown in fig. 5-6, due to the limitation of the welding position, a welder leans to one side of the wear-resistant steel plate, therefore, under the condition of keeping the effective size of a welding angle to be 30mm, a deep-melting fillet weld groove is designed to be 45 degrees, the groove depth is designed to be 20mm, the groove width is designed to be 20mm, and the welding leg size is designed to be 10 mm.
In the drawings, the positional relationship is described for illustrative purposes only and is not to be construed as limiting the present patent; it is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A welding process for repairing a deep-melting fillet weld and a crack of wear-resistant steel is characterized by comprising the following steps of: the method comprises the following steps:
s1, preheating a wear-resistant steel plate with cracks, removing the cracks by carbon planing, and preserving heat and cooling after carbon planing to prevent new cracks;
S2, observing that cracks originate from the root or fusion line position of the fillet weld from the weld of the wear-resistant steel plate after the carbon planing, and expanding to the surface of the wear-resistant steel plate, so as to judge and analyze the cracks on the wear-resistant steel plate;
S3, after the cracks are thoroughly removed, beveling, preheating, and repairing welding on the wear-resistant steel plate;
s4, reheating the wear-resistant steel plate subjected to repair welding, and controlling the interlayer temperature of the wear-resistant steel plate;
S5, performing repair welding on cracks on the wear-resistant steel plate by using a welding rod or welding wire with high Ni content, and improving the crack resistance of the welding line;
and S6, optimizing the groove form of the deep-melting angle welding of the wear-resistant steel plate.
2. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: the step S1 includes the following steps:
S1, preheating a wear-resistant steel plate with cracks to 100 ℃, and removing the cracks by carbon planing;
s2, heat preservation and cooling are carried out on cracks covered on the wear-resistant steel plate by using heat preservation cotton, so that new cracks are prevented from being generated.
3. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: the step S2 includes the following steps:
s21, observing the positions of root parts or weld lines of cracks originating from fillet welds and the positions of the surfaces of the wear-resistant steel plates;
S22, if the crack originates from the root of the fillet weld, determining that the root of the fillet weld has an unfused defect, and if the crack originates from the weld line position, determining that the weld line position has an unfused defect.
4. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: in the step S3, the cracks on the wear-resistant steel plate are subjected to repair welding in a manual welding or CO2 welding mode.
5. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: in the step S4, the welded seam and 50mm positions on two sides of the wear-resistant steel plate subjected to repair welding are reheated to 120 ℃, and the interlayer temperature of the wear-resistant steel plate is controlled to be 120-200 ℃.
6. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: in the step S5, the electrode or wire with high Ni content is 307 electrode or 307 flux-cored wire.
7. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: in the step S6, under the condition of ensuring that the effective size of the fillet is unchanged, the groove angle and the fillet size of the deep-melting fillet weld of the wear-resistant steel plate are enlarged, so that the groove depth is reduced.
8. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: the wear-resistant steel plate is of an arc-shaped structure and is uniformly attached to the wall plate of the pile fixing chamber.
9. The welding process for repairing a deep-melting fillet weld and a crack of wear-resistant steel according to claim 8, wherein: the pile fixing chamber surrounding wall plate is 40mm EH36 steel.
10. The welding process for repairing the deep-melting fillet weld and the cracks of the wear-resistant steel according to claim 1, wherein the welding process comprises the following steps of: the wear-resistant steel plate is NM400 wear-resistant steel plate, and the thickness is 40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410345061.5A CN118123301A (en) | 2024-03-25 | 2024-03-25 | Welding process for repairing deep-melting fillet weld and crack of wear-resistant steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410345061.5A CN118123301A (en) | 2024-03-25 | 2024-03-25 | Welding process for repairing deep-melting fillet weld and crack of wear-resistant steel |
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| CN118123301A true CN118123301A (en) | 2024-06-04 |
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| CN202410345061.5A Pending CN118123301A (en) | 2024-03-25 | 2024-03-25 | Welding process for repairing deep-melting fillet weld and crack of wear-resistant steel |
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| CN (1) | CN118123301A (en) |
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- 2024-03-25 CN CN202410345061.5A patent/CN118123301A/en active Pending
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