CN111283314B - Welding method for side wall assembly of motor train unit train and motor train unit train - Google Patents
Welding method for side wall assembly of motor train unit train and motor train unit train Download PDFInfo
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- CN111283314B CN111283314B CN201811491481.5A CN201811491481A CN111283314B CN 111283314 B CN111283314 B CN 111283314B CN 201811491481 A CN201811491481 A CN 201811491481A CN 111283314 B CN111283314 B CN 111283314B
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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Abstract
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train and the motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework, and the welding method comprises the following steps: spraying a conductive protective layer on the welding surface of the side wall framework and the side wall plate; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding method of a side wall assembly of a motor train unit train and the motor train unit train.
Background
Due to the advantages of rapidness and comfort, the motor train unit train gradually becomes the first choice of transportation for people to go out in recent years, and is rapidly developed. Meanwhile, as the train of the motor train unit runs at a high speed, the requirement on the safety of the train is higher and higher.
In order to increase the safety of the train of the motor train unit, the side wall body of the train compartment of the motor train unit is generally formed by welding a side wall body framework and a side wall plate. Welding the side wall framework and the side wall plate by adopting a plug welding process; however, in the plug welding process, along with arc light, smoke, dust, noise and the like, the health of construction workers is easily damaged, and the welded part after plug welding is deformed greatly, so that the flatness of the welded part is difficult to ensure.
In the prior art, a method for welding the side wall framework and the side wall plate by adopting a resistance spot welding process is also adopted, the heating time of the resistance spot welding process is short, the heat is concentrated, the influence on a welded part is small, the flatness of the welded part can be ensured, and the harm to the health of construction workers is reduced. However, the resistance spot welding process is prone to corrosion from the welding joint surface of the welding part, so that the side wall body of the train carriage of the motor train unit has the problem of poor corrosion resistance, and the service life of the motor train unit train is short.
Disclosure of Invention
The embodiment of the invention provides a method for welding a side wall assembly of a motor train unit train and the motor train unit train, which are used for solving the problem that the side wall body of a welded motor train unit train carriage in the prior art is poor in corrosion resistance, improving the corrosion resistance of the motor train unit train carriage and prolonging the service life of the motor train unit train.
In a first aspect, an embodiment of the invention provides a welding method for a side wall assembly of a motor train unit train, wherein the side wall assembly comprises a side wall framework and a side wall plate connected with the side wall framework, and the welding method comprises the following steps:
spraying a conductive protective layer on the welding surface of the side wall framework and the side wall plate;
and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly.
As an optional implementation manner, an embodiment of the present invention provides a method for welding a side wall assembly of a train of a motor train unit, where the preset parameters include:
the welding current is 7-12 KA, the electrode pressure is 8-12 KN, the pre-pressing time is not less than 1000ms, and the holding time is not less than 900 ms.
As an optional implementation manner, an embodiment of the invention provides a welding method for a side wall assembly of a train of a motor train unit, wherein resistance spot welding is performed on a welding surface of a side wall framework and a side wall plate according to preset parameters, and the welding method specifically comprises the following steps:
carrying out resistance spot welding according to the preset parameters in a preheating stage, a main welding stage and a post-heating stage in sequence;
the welding current in the preheating stage is 7-10 KA, the welding time is not less than 300ms, and the cooling time is not less than 100 ms;
the welding current in the main welding stage is 11-12 KA, the welding time is not less than 600ms, and the cooling time is not less than 100 ms;
and the welding current of the post-heating stage is 11-12 KA, and the welding time is not less than 600 ms.
As an optional implementation manner, an embodiment of the present invention provides a method for welding a side wall assembly of a motor train unit train, where before resistance spot welding of a welding surface of a side wall skeleton and a side wall plate according to preset parameters, the method further includes:
and pasting an electrostatic protection film on the non-welding surfaces of the side wall framework and the side wall plate.
As an optional implementation manner, an embodiment of the present invention provides a method for welding a side wall assembly of a motor train unit train, where before spraying a conductive coating on a welding surface of a side wall skeleton and a side wall plate, the method further includes:
and sanding the surfaces of the side wall framework and the side wall plate.
As an optional implementation manner, an embodiment of the present invention provides a method for welding a side wall assembly of a motor train unit train, where after resistance spot welding of a welding surface of a side wall skeleton and a side wall plate according to preset parameters, the method further includes:
and removing the conductive protective layer in the non-welding area of the welding surface of the side wall framework and the side wall plate.
As an optional implementation mode, the embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train, wherein the side wall framework is obtained by welding an upright post and a longitudinal beam; wherein the welding of the upright and the stringer comprises the steps of:
sanding the surfaces of the upright post and the longitudinal beam;
pasting an electrostatic protection film on the non-welding surfaces of the upright post and the longitudinal beam;
spraying a conductive protective layer on the welding surface of the upright post and the longitudinal beam;
and removing the static protective film, and welding the upright post and the longitudinal beam through fusion welding to obtain the side wall framework.
As an optional implementation manner, the embodiment of the invention provides a welding method for a side wall assembly of a train of a motor train unit, and the conductive protection layer is made of conductive paint or conductive adhesive.
As an optional implementation manner, an embodiment of the present invention provides a method for welding a side wall assembly of a motor train unit train, where after resistance spot welding of a welding surface of a side wall skeleton and a side wall plate according to preset parameters, the method further includes:
and spraying antirust paint on the side wall assembly, wherein the dry film thickness of the antirust paint is less than or equal to 30 micrometers.
In a second aspect, an embodiment of the invention provides a motor train unit train, which comprises a side wall assembly welded by the welding method of the motor train unit train side wall assembly provided by the embodiment of the first aspect of the invention.
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train and the motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart of a method for welding a side wall assembly of a motor train unit train according to a first embodiment of the invention;
FIG. 2 is a flowchart of a method for welding a side wall assembly of a motor train unit train according to a second embodiment of the invention;
fig. 3 is a flowchart of a welding method for a side wall frame in a side wall assembly of a train of motor trains according to a third embodiment of the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the disclosure to those skilled in the art by 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 of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.
Due to the advantages of rapidness and comfort, the motor train unit train gradually becomes the first choice of transportation for people to go out in recent years, and is rapidly developed. Meanwhile, as the train of the motor train unit runs at a high speed, the requirement on the safety of the train is higher and higher.
In order to increase the safety of the train of the motor train unit, the side wall body of the train compartment of the motor train unit is generally formed by welding a side wall body framework and a side wall plate. Welding the side wall framework and the side wall plate by adopting a plug welding process; however, in the plug welding process, along with arc light, smoke, dust, noise and the like, the health of construction workers is easily damaged, and the welded part after plug welding is deformed greatly, so that the flatness of the welded part is difficult to ensure.
In the prior art, a method for welding the side wall framework and the side wall plate by adopting a resistance spot welding process is also adopted, the heating time of the resistance spot welding process is short, the heat is concentrated, the influence on a welded part is small, the flatness of the welded part can be ensured, and the harm to the health of construction workers is reduced. However, the resistance spot welding process is prone to corrosion from the welding joint surface of the welding part, so that the side wall body of the train carriage of the motor train unit has the problem of poor corrosion resistance, and the service life of the motor train unit train is short.
Example one
Fig. 1 is a flowchart of a welding method for a train side wall assembly of a motor train unit according to a first embodiment of the invention.
In a typical application scenario, the motor train unit train side wall assembly comprises a side wall framework and a side wall plate connected with the side wall framework. It should be noted that, in the embodiment of the present invention, only the case that the welding method is applied to welding of a side wall assembly of a train of a motor train unit is taken as an example, and it can be understood that the welding method provided in the embodiment of the present invention may also be applied to other welding production fields where a welding joint surface needs to be protected from corrosion, and the embodiment of the present invention is not particularly limited thereto. Referring to fig. 1, a welding method for a train side wall assembly of a motor train unit according to a first embodiment of the invention includes the following steps:
Specifically, in this embodiment, the conductive protection layer may be a conductive paint or a conductive adhesive. Optionally, performance parameters of the conductive protection layer in this embodiment are shown in table 1.
TABLE 1 Performance parameters of conductive protective layers
The drying time (surface drying) is also called touch drying, and refers to the time when the sprayed conductive protective layer reaches the surface and starts to form a film after the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate. The drying time (actual drying) refers to the actual complete drying time, namely the time for completely curing the conductive protective layer after the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate. Flexibility refers to the resistance of a coating to cracking or peeling from a metal or plastic substrate when bent around a cylindrical axis under standard conditions. The adhesive force refers to the capability of the conductive protective layer to be combined with the side wall framework and the side wall plate. Salt spray resistance refers to the resistance of the conductive protective layer to salt spray erosion. Specifically, the conductive paint in the present embodiment may be a conductive paint commercially available with reference to the performance parameters in table 1. This embodiment will not be described in detail.
Optionally, in this embodiment, the thickness of the conductive protection layer sprayed on the welding surface of the side wall framework and the side wall panel is controlled to be less than or equal to 30 μm, wherein the ablation width of the sprayed conductive protection layer in welding or cutting is less than or equal to 15 mm.
Optionally, in this embodiment, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate under an environment condition that the ambient temperature is 18 to 40 ℃ and the relative air humidity is less than or equal to 75%.
And 102, performing resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly.
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
Further, the preset parameters of the method for welding the side wall assembly of the motor train unit train provided by the first embodiment of the invention include:
the welding current is 7-12 KA, the electrode pressure is 8-12 KN, the pre-pressing time is not less than 1000ms, and the holding time is not less than 900 ms.
Specifically, in this embodiment, resistance spot welding according to preset parameters the side wall skeleton with the face of weld of side wall board specifically includes:
carrying out resistance spot welding according to the preset parameters in a preheating stage, a main welding stage and a post-heating stage in sequence;
the welding current in the preheating stage is 7-10 KA, the welding time is not less than 300ms, and the cooling time is not less than 100 ms;
the welding current in the main welding stage is 11-12 KA, the welding time is not less than 600ms, and the cooling time is not less than 100 ms;
and the welding current of the post-heating stage is 11-12 KA, and the welding time is not less than 600 ms.
Optionally, in this embodiment, the diameter of the welding spot for resistance spot welding between the side wall framework and the side wall plate is greater than or equal to 8mm, and the distance between the welding spots is not greater than 80 mm.
Optionally, in this embodiment, the specification of the electrode for resistance spot welding between the side wall framework and the side wall plate may be a Φ 16 electrode, and the selected current may be a direct current.
Optionally, in this embodiment, the electric welding machine and the spot welding copper table for resistance spot welding between the side wall framework and the side wall panel may be a spot welding machine of model NM-CC-3-110/1, manufactured by electrical element society.
Optionally, in this embodiment, after the welding between the side wall framework and the side wall panel is completed, the existing method for detecting the spot-to-spot welding head may be adopted for detection.
For example, appearance detection:
visually observing whether the surface of the welding area or the adjacent welding area has cracks or not;
whether spatter or electrode adhesion exists on the welding surface;
measuring the diameter of a pit on the surface of the welding spot; wherein the diameter of the pit is less than or equal to 1.5 mm;
the depth of the electrode indentation and whether burn-through occurs or not; wherein the electrode indentation is not more than 25% of the plate thickness.
And performing a tension-shear test, a section test, a stripping and chiseling-stripping test and the like on the welded side wall body working test piece according to the method in the prior art. Wherein the minimum value of the tensile-shear test load is more than 16.5 KN; the peel and gouge peel test determines that the nugget diameter is greater than 8 mm. The specific test detection method can be performed according to the method in the prior art, and is not described in detail in this embodiment.
Specifically, in this example, the cross-sectional test was performed by cutting the nugget perpendicularly to the center thereof and visually inspecting the shape, diameter, penetration rate, and internal defect of the nugget.
Specifically, in this example, the results of the section test are shown in table 2:
TABLE 2 side wall skeleton and side wall panel welded section test results
The internal defect is a defect such as a void existing in the solder core.
Specifically, in this embodiment, the determination of the type of the weld failure is determined according to the ISO 10447 standard.
In this embodiment, after the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall board, optionally, the non-contact surface of the side wall framework and the side wall board can be wiped by using an organic solvent. Specifically, the organic solvent in this embodiment may be alcohol, gasoline, or the like. The non-contact surfaces of the side wall framework and the side wall plate are wiped by using the organic solvent, so that oil stains and the like on the surfaces of the side wall framework and the side wall plate can be removed, the conductivity of the side wall framework and the side wall plate is improved, and the welding effect is improved.
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
Example two
Fig. 2 is a flowchart of a welding method for a train side wall assembly of a motor train unit according to a second embodiment of the invention.
Referring to fig. 2, a welding method for a train side wall assembly of a motor train unit according to a second embodiment of the invention includes the following steps:
Specifically, in this embodiment, the sanding treatment is performed on the surfaces of the side wall framework and the side wall plate to remove oxide skin, oil stains and the like on the surfaces of the side wall framework and the side wall plate, so as to improve the surface cleanliness of the side wall framework and the side wall plate. Specifically, in the embodiment, the surface cleanliness of the side wall framework and the side wall board after sanding treatment on the surfaces of the side wall framework and the side wall board reaches grade Sa 21/2 required in GB/T8923, and the surface roughness is 3-10 μm.
Optionally, in this embodiment, the static electricity protection film may be a PE static electricity protection film.
And 203, spraying a conductive protective layer on the welding surface of the side wall framework and the side wall plate.
In this embodiment, because the static protective film is pasted on the non-welding surface of side wall skeleton and side wall board, consequently, can avoid electrically conductive inoxidizing coating spraying to improve the accuracy of electrically conductive inoxidizing coating spraying on the non-welding surface of side wall skeleton and side wall board.
Specifically, in this embodiment, the conductive protection layer may be conductive paint or conductive adhesive, and the specific performance parameter requirement of the conductive protection layer in this embodiment may specifically refer to the performance parameter requirement of the conductive protection layer provided in the first embodiment of the present invention, which is not described in detail in this embodiment.
Specifically, in this embodiment, the spraying environment of the conductive protection layer may refer to the spraying environment of the conductive protection layer provided in the first embodiment of the present invention, and details are not described in this embodiment.
And 204, performing resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly.
And step 205, removing the conductive protective layer in the non-welding area of the welding surface of the side wall framework and the side wall plate.
Specifically, in this embodiment, after the side wall framework and the side wall panel are welded, a non-welded area on the welded side wall assembly may be subjected to sanding treatment to remove the redundant conductive protective coating on the non-welded area.
And step 206, spraying antirust paint on the side wall component.
Specifically, in this embodiment, an anti-corrosive primer may be sprayed on the welded side wall assembly first. And spraying the anti-rust finish paint after the anti-rust primer is completely cured. Optionally, in this embodiment, the thickness of the dry film sprayed with the anti-corrosive primer is less than or equal to 30 μm, and the adhesion is less than or equal to level 1.
Wherein the adhesion is a force of a firm degree of the bonding of the rust inhibitive primer to the side wall assembly. Alternatively, the rating of adhesion may be made with reference to the following criteria: level 0: the cut edge is completely smooth without any peel-off. Level 1: there was little coating peeling at the intersection of the cuts, but the cross cut area was not affected significantly more than 5%. And 2, stage: the coating is stripped at the intersection of the cuts and/or along the edges of the cuts, the affected cross-cut area is significantly greater than 5%, but not significantly greater than 15%. And 3, level: the cross-cut area affected by partial or total flaking of the coating along the cut edges in large pieces and or in different parts of the grid is significantly greater than 15% but not significantly greater than 35%. 4, level: the coating is stripped along the cutting edge by large fragments and or some squares are partially or completely stripped, and the affected cross cutting area is obviously more than 35 percent but not more than 65 percent. And 5, stage: the degree of exfoliation was over grade 4.
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
EXAMPLE III
Fig. 3 is a flowchart of a welding method for a side wall frame in a side wall assembly of a train of motor trains according to a third embodiment of the present invention.
Based on the first embodiment and the second embodiment, referring to fig. 3, a third embodiment of the present invention provides a method for welding a side wall framework in a side wall assembly of a train in a bullet train set, the side wall framework including a pillar and a stringer, the method including the steps of:
And step 302, pasting an electrostatic protection film on the non-welding surfaces of the upright columns and the longitudinal beams.
And 303, spraying a conductive protective layer on the welding surface of the upright post and the longitudinal beam.
And 304, removing the static protective film, and welding the upright column and the longitudinal beam through fusion welding to obtain the side wall body framework.
In this embodiment, the processing manner and the requirements for the process parameters in each step may refer to the description in the relevant steps in the first embodiment and the second embodiment, and are not described in detail in this embodiment.
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
Example four
The fourth embodiment of the invention provides a motor train unit train, which comprises the side wall assembly welded by the welding method of the side wall assembly of the motor train unit train provided by any one of the first to third embodiments of the invention.
Optionally, in this embodiment, the material of the side wall assembly may be a weather-resistant steel plate.
The embodiment of the invention provides a welding method of a side wall assembly of a motor train unit train and the motor train unit train, wherein the side wall assembly of the motor train unit train comprises a side wall framework and a side wall plate connected with the side wall framework; and carrying out resistance spot welding on the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain the side wall assembly. According to the welding method of the side wall assembly of the motor train unit train, provided by the embodiment of the invention, the conductive protective layer is sprayed on the welding surface of the side wall framework and the side wall plate, and after the welding of the side wall framework and the side wall plate is completed, the welding surface of the side wall framework and the side wall plate can be protected by the conductive protective layer, so that the corrosion of the welding joint surface between the side wall framework and the side wall plate is avoided, the corrosion resistance of the side wall body of the motor train unit train carriage is improved, and the service life of the motor train unit train is prolonged.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The welding method of the side wall assembly of the motor train unit train is characterized by comprising the following steps of:
spraying a conductive protective layer on the welding surface of the side wall framework and the side wall plate;
resistance spot welding the welding surface of the side wall framework and the side wall plate according to preset parameters to obtain a side wall assembly;
the conductive protective layer is sprayed under the environmental conditions that the environmental temperature is 18-40 ℃ and the relative air humidity is less than or equal to 75%, and the spraying thickness of the conductive protective layer is less than or equal to 30 mu m;
the preset parameters include:
the welding current is 7-12 KA, the electrode pressure is 8-12 KN, the pre-pressing time is not less than 1000ms, and the holding time is not less than 900 ms;
resistance spot welding according to preset parameter the side wall skeleton with the face of weld of side wall board specifically includes:
carrying out resistance spot welding according to the preset parameters in a preheating stage, a main welding stage and a post-heating stage in sequence;
the welding current in the preheating stage is 7-10 KA, the welding time is not less than 300ms, and the cooling time is not less than 100 ms;
the welding current in the main welding stage is 11-12 KA, the welding time is not less than 600ms, and the cooling time is not less than 100 ms;
and the welding current of the post-heating stage is 11-12 KA, and the welding time is not less than 600 ms.
2. The welding method for the motor train unit train side wall assembly according to claim 1, wherein before resistance spot welding the welding surfaces of the side wall framework and the side wall plate according to preset parameters, the method further comprises:
and pasting an electrostatic protection film on the non-welding surfaces of the side wall framework and the side wall plate.
3. The method for welding the motor train unit train side wall assembly according to claim 1, wherein before spraying the conductive coating on the welding surface of the side wall framework and the side wall plate, the method further comprises:
and sanding the surfaces of the side wall framework and the side wall plate.
4. The welding method of the motor train unit train side wall assembly according to claim 1, further comprising, after resistance spot welding the welding surfaces of the side wall framework and the side wall panel according to preset parameters:
and removing the conductive protective layer in the non-welding area of the welding surface of the side wall framework and the side wall plate.
5. The welding method of the motor train unit train side wall assembly according to claim 1, wherein the side wall framework is obtained by welding an upright post and a longitudinal beam; wherein the welding of the upright and the stringer comprises the steps of:
sanding the surfaces of the upright post and the longitudinal beam;
pasting an electrostatic protection film on the non-welding surfaces of the upright post and the longitudinal beam;
spraying a conductive protective layer on the welding surface of the upright post and the longitudinal beam;
and removing the static protective film, and welding the upright post and the longitudinal beam through fusion welding to obtain the side wall framework.
6. The method for welding the motor train unit train side wall assembly according to claim 1, wherein the conductive protective layer is made of conductive paint or conductive adhesive.
7. The welding method of the motor train unit train side wall assembly according to any one of claims 1 to 6, wherein after the resistance spot welding of the welding surfaces of the side wall framework and the side wall plate according to preset parameters, the welding method further comprises:
and spraying antirust paint on the side wall assembly, wherein the dry film thickness of the antirust paint is less than or equal to 30 micrometers.
8. The motor train unit train is characterized by comprising the side wall assembly welded by the welding method of the motor train unit train side wall assembly as claimed in any one of claims 1 to 7.
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| CN111283314A (en) | 2020-06-16 |
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