CN112548382A - Defect welding repair process for arc surface welding seam - Google Patents
Defect welding repair process for arc surface welding seam Download PDFInfo
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- CN112548382A CN112548382A CN202010242229.1A CN202010242229A CN112548382A CN 112548382 A CN112548382 A CN 112548382A CN 202010242229 A CN202010242229 A CN 202010242229A CN 112548382 A CN112548382 A CN 112548382A
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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
- 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
- B23K31/02—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 soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention discloses a defect welding repair process of an arc surface welding seam, which comprises the following steps of S1, carrying out flaw detection on the welding seam of the arc surface of a workpiece, and marking a defect area; s2, protecting and isolating the base material around the defect area, and removing the welding line of the defect area; s3, flaw detection is carried out on the defect area after the welding seams are removed, if no defect is found, the step S4 is executed, and if a defect is found, the step S5 is executed; s4, performing scratch removal on the welding seam of the defect area again, and executing the step S2; s5, cleaning the periphery of the defect area; and S6, placing the workpiece at a PA welding repair position, and welding and repairing the defect area. According to the defect welding repair process for the arc-surface welding seam, disclosed by the invention, the interlayer penetration can be effectively controlled by a layer-by-layer repair welding method, the operation difficulty is reduced, the problem of part scrapping caused by improper operation of the welding repair method is solved, the internal defect of the welding seam is eliminated, the consumption of consumable materials is reduced, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a defect welding repair process for a circular arc surface welding seam.
Background
The method is different from the general plane welding repair method of welding repair of welding seams because of the requirement of bearing the load of part of the welding seams after the motor train unit framework is welded, and the current method without the proper welding repair of the welding seams of the arc surfaces has the disadvantages of low success rate and efficiency of welding repair of welding seams with similar structures in the early stage and the following quality risks:
1. the frame is scrapped due to failure of welding repair, so that more economic losses are caused;
2. the repair is not thorough, so that repeated welding repair is caused, the strength of a welding seam and a steel plate is influenced, and excessive manpower and material resource losses are caused;
3. the heat concentration can be caused by many times of welding repair at the same position, the welding deformation of each seat is caused, and the adjustment and repair are required to be carried out repeatedly.
The above problems are risks of arc surface welding repair, which directly affect the product quality of the whole bogie, and each motor train unit and subway project has a plurality of similar structures, so that the quality control risks are high, and the research is generated based on the background.
Chinese patent application No. CN201710046089.9 discloses a method for preventing deformation of a thin-walled part during repair welding repair of the thin-walled part, the method comprising: determining the shape, the number, the size and the arrangement position of the support rib according to the position, the shape and the defect degree of the defect part of the thin-wall part and the welding strength of the repair welding operation to be implemented; providing a plurality of support ribs of the above shape, size and number; joining the support rib to the arrangement position by welding; repairing and welding the defect part; carrying out annealing operation treatment on the thin-wall part; polishing the welding spot of the repair welding repair operation; and removing the support rib and polishing the welding spot of the support rib.
Chinese patent with application number CN201310423538.9 discloses a full-automatic on-line cold welding repair roller press process, which is characterized by comprising the following steps: (1) pretreating the roll surface of the cement squeeze roll to remove a fatigue layer, and welding check rings at two ends of the roll surface, wherein the check rings and the roll surface are on the same curved surface; (2) checking whether the roller surface has cracks or not, and if so, polishing and removing the cracks; performing repair welding on the pits until the pits are repaired; (3) overlaying the roller surface by adopting open arc automatic welding; (4) and removing the check ring, and polishing and flattening the surface of the roller.
Although the above prior art proposes technical solutions for repair welding, repair and the like of a welded part, there is no special repair welding solution for an arc-shaped surface weld, and there is no complete operation process, and there are situations of incomplete repair and repeated repair welding.
Therefore, the defects of the prior art need to be improved, the defect welding repair process for the arc-surface welding seam is provided, the operation difficulty is reduced by standardizing the operation process, the interlayer permeability can be effectively controlled by a layer-by-layer repair welding method, the problem of scrapping of parts caused by improper operation of the welding repair method is solved, the internal defect of the welding seam is eliminated, the consumption of consumables is reduced, and the production efficiency is improved.
The present invention has been made in view of this situation.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a defective repair welding process for a circular arc surface weld which overcomes or at least partially solves the above mentioned problems.
In order to solve the technical problems, the invention adopts the technical scheme that: a defect welding repair process for a circular arc surface welding seam comprises the following steps,
s1, flaw detection is carried out on a welding seam of an arc surface of a workpiece, and a defect area is marked;
s2, protecting and isolating the base material around the defect area, and removing the welding line of the defect area;
s3, flaw detection is carried out on the defect area after the welding seams are removed, if no defect is found, the step S4 is executed, and if a defect is found, the step S5 is executed;
s4, performing scratch removal on the welding seam of the defect area again, and executing the step S2;
s5, cleaning the periphery of the defect area to remove surface impurities;
and S6, placing the workpiece at a PA welding repair position, and welding and repairing the defect area.
In step S1, the adopted flaw detection method is UT flaw detection, which is used to detect a depth defect of a circular arc surface weld of a workpiece, and the UT flaw detection can penetrate through the surface of the weld to detect an approximate position of an internal defect of the weld, and mark the position to facilitate subsequent processing.
In addition, in step S2, the defect area is scratched to be deeper than the actual depth measured by UT flaw detection by 1mm to 2mm in the depth direction, so that the defect at the position can be completely removed, and the removed redundant part is supplemented by welding;
in one embodiment, the method further comprises a step S21 of polishing the welding seam of the defect area after the welding seam is removed by using a grinding wheel, specifically, the polishing aims at removing flaws and burrs of the welding seam on the surface of the defect area and also can repair a part of defects, and during polishing, the bottom of the defect area is polished according to the shape of an arc surface;
in one embodiment, the cut-off wheel has a size between 100mm and 150 mm.
Meanwhile, in step S3, the adopted flaw detection method is MT flaw detection, and is used for performing flaw detection on the surface of the arc-surface weld of the workpiece, and the MT flaw detection is used for performing flaw detection on the surface of the arc-surface weld of the workpiece, so that the quality of polishing the weld is ensured, and defects existing on the surface of the weld are avoided.
Step S31, polishing the sharp corner of the defect area after the weld joint is scratched to form a U-shaped groove, wherein in the polishing process, the sharp corner of the defect area is polished to be smooth and excessive, and the bottom of the U-shaped groove also keeps the shape of an arc surface, so that the subsequent welding and repair are facilitated;
the bottom edge of the U-shaped groove and the smooth transition between the bottom edge and the side edge are formed;
in one embodiment, the angle between the side edge and the bottom edge of the U-shaped groove is between 120 ° and 160 °.
And, in step S4, the scratch depth of the defect region is between 0.3 and 0.8 mm.
Further, in step S5, the periphery of the defective region is cleaned in a range extending outward from the outer periphery of the defective region by 15mm to 25 mm.
In addition, the step S6 comprises a step S61 of placing the workpiece at a PA welding repair position, feeding the workpiece along the defect area in a unidirectional spiral manner, and enabling adjacent welding seams to be closely attached and completely pressed;
in one embodiment, the thickness of the welding seam of each welding repair layer is 2mm to 3mm, the length is less than 15mm, the size of the welding seam to be welded is limited, heat input can be effectively controlled, and welding deformation is reduced.
Further, the step S6 includes the step S62 of measuring the temperature of each welded seam with a temperature measuring instrument, polishing each welded layer until no defect is observed, so as to ensure good fusion between each welded layer, and control the thickness of the welded seam, thereby avoiding the problem of rework caused by poor fusion between layers due to excessive thickness of the welded seam, and defects such as residual air or welding slag;
in one embodiment, the temperature of each weld repair layer does not exceed 200 ℃.
Further, in step S6, at least one polishing layer is reserved on the surface of the circular arc surface of the workpiece, so as to reserve a space for subsequent surface polishing or defect repair.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the defect repair welding process for the arc-surface welding seam, the operation difficulty is reduced by standardizing the repair welding operation process, the interlayer permeability can be effectively controlled by a layer-by-layer repair welding method, the problem of component scrapping caused by improper operation of the repair welding method is solved, the internal defect of the welding seam is eliminated, the consumption of consumable materials is reduced, and the production efficiency is improved;
2. the surface to be welded is a radian surface rather than a plane of a common welding position, the U-shaped cutting method of a defect position is adopted, the bottom of a groove is arc-shaped, a sharp included angle is avoided, a small welding specification is adopted, the fluidity of a welding pool is good, and the phenomenon of incomplete penetration is avoided;
3. compared with the traditional V-shaped deduction method process, the operation process can effectively remove defects, the included angle formed between the edge of the welding line formed in the welding process and the transition position of the base metal is large, the subsequent operation is facilitated, and the included angle is easy to melt through in the welding process.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In the drawings:
FIG. 1 is a first schematic view of a defect repair process of the present invention;
FIG. 2 is a second schematic view of the defect repair process of the present invention;
FIG. 3 is a schematic diagram of a defect area after the circular arc surface is scratched out in the present invention;
FIG. 4 is a schematic view of a defect area after arc repair welding according to the present invention;
FIG. 5 is a schematic view of the parameters of the repair welding process of the present invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In one embodiment, as shown in fig. 1 to 5, the defective repair welding process for a circular arc surface weld seam according to the present invention includes the following steps,
s1, flaw detection is carried out on a welding seam of an arc surface of a workpiece, and a defect area is marked;
s2, protecting and isolating the base material around the defect area, and removing the welding line of the defect area;
s3, flaw detection is carried out on the defect area after the welding seams are removed, if no defect is found, the step S4 is executed, and if a defect is found, the step S5 is executed;
s4, performing scratch removal on the welding seam of the defect area again, and executing the step S2;
s5, cleaning the periphery of the defect area to remove surface impurities;
and S6, placing the workpiece at a PA welding repair position, and welding and repairing the defect area.
Particularly, the invention reduces the operation difficulty by standardizing the welding repair operation process, can effectively control the interlayer permeability by a layer-by-layer repair welding method, solves the problem of part scrapping caused by improper operation of the welding repair method, eliminates the internal defect of the welding line, reduces the consumption of consumable materials and improves the production efficiency.
In step S1, the adopted flaw detection method is UT flaw detection, which is used to detect a depth defect of a circular arc surface weld of a workpiece, and the UT flaw detection can penetrate through the surface of the weld to detect an approximate position of an internal defect of the weld, and mark the position to facilitate subsequent processing.
In addition, in step S2, the defect area is scratched to be deeper than the actual depth measured by UT flaw detection by 1mm to 2mm in the depth direction, so that the defect at the position can be completely removed, and the removed redundant part is supplemented by welding;
further, the method comprises the step S21 of polishing the welding seam of the defect area after the welding seam is scratched and removed by using a grinding wheel, specifically, the polishing aims at removing flaws and burrs of the welding seam on the surface of the defect area and also can repair a part of defects, and during polishing, the bottom of the defect area is polished according to the shape of an arc surface;
as a preferable technical scheme of the embodiment, the size of the grinding wheel is between phi 100mm and phi 150 mm.
Meanwhile, in step S3, the flaw detection method adopted is MT flaw detection for detecting the surface of the arc surface weld of the workpiece.
Step S31, polishing the sharp corner of the defect area after the weld joint is removed, so that the defect area is removed and polished to form a U-shaped groove, wherein in the polishing process, the sharp corner of the defect area is polished to be smooth and excessive, the bottom of the U-shaped groove also keeps the shape of an arc surface, so that the subsequent welding and repair are facilitated, and the bottom edge of the U-shaped groove and the bottom edge and the side edge are in smooth transition; the to-be-welded surface is a radian surface instead of a plane of a common welding position, the U-shaped cutting method of a defect position is adopted, the bottom of a groove is arc-shaped, and has no sharp included angle, a small welding specification is adopted, the fluidity of a welding pool is good, the phenomenon of incomplete penetration is avoided, compared with the traditional V-shaped buckling method process, the operation process can effectively remove the defect, the included angle formed at the transition part of the edge of a welding seam and a base metal in the welding process is large, the subsequent operation is facilitated, and the included angle is easy to be penetrated at the welding position in the welding process;
as a preferable technical solution of the present embodiment, an included angle between a side edge and a bottom edge of the U-shaped groove is between 120 ° and 160 °.
And, in step S4, the scratch depth of the defect region is between 0.3 and 0.8 mm.
Further, in step S5, the periphery of the defective region is cleaned in a range extending outward from the outer periphery of the defective region by 15mm to 25 mm.
In addition, the step S6 is to place the workpiece at the PA welding repair position, i.e. the horizontal position, by using a rotating tire or a support;
the step S6 comprises the step S61 of placing the workpiece at a PA welding repair position, feeding the workpiece along the defect area in a unidirectional spiral manner, and enabling adjacent welding seams to be closely attached and completely pressed;
further, the thickness of the welding seam of each welding and repairing layer is 2mm to 3mm, the length is smaller than 15mm, the size of the welding seam to be welded and repaired is limited, heat input can be effectively controlled, welding deformation is reduced, fusion of the welding seams among each other can be guaranteed, the phenomenon that the length of the welding seam is too long or the width of the welding seam is too wide, extrusion deformation among the welding seams caused by the overlong or too wide welding seam is avoided, internal stress and defects are formed, and the stable performance of each welding and repairing layer is guaranteed.
Further, the step S6 includes the step S62 of measuring the temperature of each welded seam with a temperature measuring instrument, polishing each welded seam until each welded seam is visually defect-free, so as to ensure good fusion between each welded seam, and simultaneously controlling the thickness of each welded seam to avoid rework caused by poor fusion between layers and defects of residual air or welding slag due to too large thickness of the welded seam; the temperature of each welding repair layer is not more than 200 ℃.
Further, in the step S6, at least one polishing layer is reserved on the surface of the circular arc surface of the workpiece, so as to reserve a space for subsequent surface polishing or defect repair.
The welding process parameters of the arc surface of the workpiece are shown in fig. 5, and it can be seen from the figure that during welding repair, 200A current is adopted for the first layer, 260A current is adopted for the rest of layers, the temperature between the welding repair layers is strictly controlled, the preferred temperature is 200 ℃, temperature measurement is carried out by a temperature measuring instrument after each welding seam is welded, polishing is carried out between each welding repair layer by an angle grinder, and no defect is visually checked.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are also meant to be within the scope of the invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use the combination according to the known technical solutions and technical problems to be solved by the present application.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A defect welding repair process for a circular arc surface welding seam is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, flaw detection is carried out on a welding seam of an arc surface of a workpiece, and a defect area is marked;
s2, protecting and isolating the base material around the defect area, and removing the welding line of the defect area;
s3, flaw detection is carried out on the defect area after the welding seams are removed, if no defect is found, the step S4 is executed, and if a defect is found, the step S5 is executed;
s4, performing scratch removal on the welding seam of the defect area again, and executing the step S2;
s5, cleaning the periphery of the defect area to remove surface impurities;
and S6, placing the workpiece at a PA welding repair position, and welding and repairing the defect area.
2. The defect repair welding process of the arc surface welding seam according to claim 1, characterized in that: in step S1, the flaw detection method adopted is UT flaw detection for detecting a depth defect of a circular arc surface weld of a workpiece.
3. The defect repair welding process of the arc surface welding seam according to claim 2, characterized in that:
in step S2, the defect region is scratched to be deeper than the actual depth measured by UT flaw detection by 1mm to 2mm in the depth direction;
preferably, the method further comprises the step S21 of polishing the welding seam of the defect area after the welding seam is removed by using a grinding wheel;
preferably, the size of the grinding wheel is between phi 100mm and phi 150 mm.
4. The defect repair welding process of the arc surface welding seam according to claim 1, characterized in that: in step S3, the flaw detection method used is MT flaw detection for detecting the surface of the arc surface bead of the workpiece.
5. The defect repair welding process of the arc surface welding seam according to claim 4, characterized in that:
step S31, polishing the sharp corner of the defect area after the weld joint is removed, so that the defect area is removed and polished to form a U-shaped groove;
the bottom edge of the U-shaped groove and the smooth transition between the bottom edge and the side edge are formed;
preferably, the included angle between the side edge and the bottom edge of the U-shaped groove is 120-160 degrees.
6. The defect repair welding process of the arc surface welding seam according to claim 1, characterized in that: in step S4, the defect region is scratched to a depth of between 0.3 and 0.8 mm.
7. The defect repair welding process of the arc surface welding seam according to claim 1, characterized in that: in step S5, the periphery of the defect region is cleaned in a range extending outward from the outer periphery of the defect region by 15mm to 25 mm.
8. The defect repair welding process of the arc surface welding seam according to claim 1, characterized in that:
the step S6 comprises the step S61 of placing the workpiece at a PA welding repair position, feeding the workpiece along the defect area in a unidirectional spiral manner, and enabling adjacent welding seams to be closely attached and completely pressed;
preferably, the weld seam thickness of each welding repair layer is 2mm to 3mm, and the length is less than 15 mm.
9. The defect repair welding process of the arc surface welding seam according to claim 8, characterized in that:
step S6 further comprises step S62, measuring the temperature of each welded seam by using a temperature measuring instrument, polishing each welding layer until no defect is seen;
preferably, the temperature of each weld repair layer does not exceed 200 ℃.
10. The defect repair welding process of the arc surface welding seam according to any one of claims 1 to 9, which is characterized in that: in the step S6, at least one polishing layer is reserved on the surface of the circular arc surface of the workpiece.
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| CN114289990A (en) * | 2021-12-28 | 2022-04-08 | 武汉纳瑞格智能设备有限公司 | Defect repairing method for narrow gap welding seam |
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Application publication date: 20210326 |