CN112207414B - Large-scale liquid cooling pipe network and welding method thereof - Google Patents

Large-scale liquid cooling pipe network and welding method thereof Download PDF

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CN112207414B
CN112207414B CN202010963329.3A CN202010963329A CN112207414B CN 112207414 B CN112207414 B CN 112207414B CN 202010963329 A CN202010963329 A CN 202010963329A CN 112207414 B CN112207414 B CN 112207414B
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cover plate
welding
liquid cooling
pipe network
step cover
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CN112207414A (en
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方坤
宋奎晶
邵宗科
冯洁
姜海涛
江海东
殷东平
洪大良
李磊
白一峰
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CETC 38 Research Institute
Hefei University of Technology
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Hefei University of Technology
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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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/24—Preliminary treatment
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/26—Auxiliary equipment

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Abstract

The invention discloses a large-scale liquid cooling pipe network and a welding method thereof, belonging to the technical field of welding of large-scale liquid cooling pipe networks. According to the invention, the cover plate is designed into the step cover plate, the design model based on the bearing capacity is established, the thickness of the cover plate to be welded is greatly reduced on the premise of ensuring that the bearing capacity of the cover plate is not reduced, a finer stirring tool can be used in the welding process, and the welding heat input and the welding deformation are greatly reduced; the welding thickness of the designed step cover plate is greatly reduced, the solid space design change of two sides of the welding seam is caused, and the width of one side of the welding seam is equal to the welding thickness, so that the solid space of two sides of the welding seam is greatly reduced, the integration level of a large liquid cooling pipe network is improved, and the system weight is reduced.

Description

Large-scale liquid cooling pipe network and welding method thereof
Technical Field
The invention relates to the technical field of welding of large-scale liquid cooling pipe networks, in particular to a large-scale liquid cooling pipe network and a welding method thereof.
Background
The development of big battle array face, high integrated radar has proposed urgent demand to large-scale liquid cooling pipe network, and large-scale liquid cooling pipe network when promoting the radar integrated level, simplifies the system's assembly relation by a wide margin, promotes integrated precision, and then promotes radar system's reliability and battle effectiveness. With the development of advanced manufacturing technology, especially the maturity of friction stir welding technology, the manufacturing of large-scale integrated pipe network of radar becomes possible. Because a large number of high-precision radar electronic module installation interfaces exist on the integrated pipe network and dense complex flow channels exist in the integrated pipe network, the flow channels can deviate due to deformation in the welding process, enough design allowance needs to be ensured during design, and therefore the integration level and the light weight of a radar system are influenced, and therefore deformation control is one of the cores of design and manufacture of the large-scale liquid cooling pipe network.
The friction stir welding liquid cooling structure is composed of a liquid cooling shell and a cover plate, wherein the cover plate is of an even thickness structure. For a large-scale liquid cooling pipe network, because a multi-stage pipeline (flow channel) is integrated on the large-scale liquid cooling pipe network, the pressure bearing capacity of the primary pipeline with the largest width needs to be ensured during the design of the cover plate, and therefore, the thickness is larger. On one hand, the cover plate has large thickness, so that more solid spaces need to be designed on two sides of a welding seam, and the width of one side is equal to the welding thickness generally, thereby influencing the weight reduction of the structure and the integration level of the system; on the other hand, the cover plate needs to be larger in thickness, namely a longer stirring pin and a thicker shaft shoulder, so that the friction heat production area of friction stir welding is greatly increased, the welding heat input is greatly increased, and the welding deformation is the root cause. In addition, the cross section of the flow channel is reduced when the number of the flow channels of the lower-level pipeline of the multi-stage pipeline in the large-scale liquid cooling pipe network is increased, but the thickness of the cover plate at the position of the fine flow channel cannot be reduced due to the requirement of the cover plate and the like, otherwise, the welding cannot be carried out, and the problems of structure weight reduction, system integration degree, large welding heat input, large deformation and the like can be also influenced. In order to solve the problems, a large-scale liquid cooling pipe network and a welding method thereof are provided.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to guarantee at the pipeline pressure-bearing capacity at different levels, reduce required welded apron thickness by a wide margin, and then reduce welding heat input, welding deformation by a wide margin, reduce the entity space of welding seam both sides, provide a large-scale liquid cooling pipe network.
The invention solves the technical problem by the following technical scheme, and the liquid cooling device comprises a liquid cooling shell and a step cover plate, wherein the step cover plate comprises a welded step cover plate and a reinforced step cover plate, the reinforced step cover plate comprises a plurality of steps corresponding to pipelines at all stages in a flow channel, each step and the welded step cover plate are integrally formed, the width of each step is correspondingly equal to the width of each stage of pipeline, and each step is directly contacted with heat exchange fluid in each stage of pipeline.
Furthermore, the thicknesses of the welded step cover plate and the reinforced step cover plate are respectively equal to H1And H2The specific calculation process is as follows:
s11: calculating the thickness H of a conventional planar cover plate assuming a conventional planar cover plate design0And simultaneously determining the widest flow channel depth T when the conventional plane cover plate is adopted020mm and an allowable minimum depth T117.5mm, wherein T0>T1；
S12: thickness H of selectively welded step cover plate1Let H11mm, wherein H1<H0；
S13: calculating the thickness H of the reinforced step cover plate2；
S14: substituting the calculated size of the step cover plate into the liquid cooling pipe network model, and checking whether the cross-sectional area of the runner meets the design requirement; when T is0-(H1+H2-H0)<T1If the design requirement is not satisfied, let H1＝H1+1mm, repeating steps S12-S14 until T is satisfied0-(H1+H2-H0)≥T1When the cross section area of the flow channel meets the design requirement; and determining that the step cover plate at the moment is the optimal structure.
Further, in the step S11,
Figure BDA0002681352580000021
wherein L is0The maximum width of each pipeline of the large-scale liquid cooling pipe network is shown, P is the limit internal pressure of a flow passage of the large-scale liquid cooling pipe network, and sigma is the allowable stress of a welding seam of a material used by the large-scale liquid cooling pipe network.
Further, in the step S13, H2＝(H0-H1) and/K, wherein K is a coefficient related to the width of the reinforced step cover plate.
Furthermore, each stage of pipeline forms a flow channel, and when the width of the reinforced step cover plate is equal to that of the flow channel, K is 0.6.
Furthermore, when the thickness of the reinforced step cover plate is changed, the steps are in inclined surface transition.
The invention also provides a welding method of the large-scale liquid cooling pipe network, which comprises the following steps:
s21: selecting a stirring tool;
s22: cleaning the liquid cooling shell and the step cover plate, and sequentially completing assembly of the liquid cooling shell and the step cover plate, large-scale liquid cooling pipe network assembling and clamping and step cover plate fixing;
s23: according to the size of the stirring tool, selecting low-heat-input welding parameters for welding in a welding process window;
s24: carrying out heat treatment with the tool to remove welding stress.
Further, in the step S21, the length of the pin of the stirring tool is equal to H1The diameter of the shaft shoulder of the stirring tool is 2H1～2.5H1. Namely, the shortest length of the stirring pin is selected on the premise of ensuring the complete welding of the welding step cover plate, and the diameter of the small-diameter shaft shoulder in the process window is selected on the premise of ensuring the welding quality.
Further, in step S22, the step cover plate is fixed by a welding tool during welding.
Compared with the prior art, the invention has the following advantages:
(1) the invention changes the traditional method that the large-scale liquid cooling pipe network adopts the design of the conventional plane cover plate, designs the cover plate into the step cover plate, establishes the design model based on the bearing capacity, greatly reduces the thickness of the cover plate to be welded on the premise of ensuring that the bearing capacity of the cover plate is not reduced, ensures that a finer stirring tool can be used in the welding process, and greatly reduces the welding heat input and the welding deformation.
(2) The welding thickness of the step cover plate designed by the invention is greatly reduced, the solid space design change at two sides of the welding seam is caused, and the solid space at two sides of the welding seam is greatly reduced because the width of one side of the welding seam is equal to the welding thickness, so that the integration level of a large liquid cooling pipe network is improved, and the system weight is reduced.
(3) The invention changes the cover plate design of the multistage flow passage in the large-scale liquid cooling pipe network, so that the flow passage with a small section can be designed with the reinforced step with smaller thickness, thereby further reducing the weight of the system.
(4) The invention provides a quantitative design method of a step cover plate, which can quantitatively design the structural size of the cover plate according to parameters such as the width of a large-scale liquid cooling pipe network flow passage, the limit internal pressure, the allowable stress of a welding seam of a used material and the like, greatly reduce the structural redundancy design and ensure the reliability of a welding structure.
(5) The inclined plane transition is adopted at the position for enhancing the thickness change of the step, so that the stress concentration of the flow channel can be greatly reduced, and the reliability of the system is improved.
(6) For the large-scale liquid cooling pipe network, the stirring tool required by the invention can ensure the penetration of the root of the welding line and further reduce the welding heat input, thereby reducing the structural deformation.
Drawings
FIG. 1a is a schematic view of the internal structure of a large liquid-cooled piping network according to the present invention;
FIG. 1b is a side view of a large liquid-cooled piping network of the present invention;
FIG. 2a is a schematic diagram of the structure of a liquid-cooled housing in a large liquid-cooled piping network according to the present invention;
FIG. 2b is a cross-sectional view taken along line A-A of FIG. 2 a;
FIG. 3a is a schematic structural view of a step cover plate in a large-scale liquid-cooled pipe network according to the present invention;
FIG. 3B is a cross-sectional view taken along line B-B of FIG. 3 a;
FIG. 3c is a side view of the step cover of FIG. 3 a;
FIG. 4a is a schematic structural view of a conventional planar cover plate;
FIG. 4b is a cross-sectional view taken along line E-E of FIG. 4 a;
FIG. 4c is a side view of the conventional planar cover plate of FIG. 4 a;
fig. 5 is a schematic view of the structure of a stirring tool used in the welding method of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example one
As shown in fig. 1 to 5, the embodiment provides a large-scale liquid cooling pipe network, which includes a liquid cooling housing 2 and a step cover plate 3, wherein the step cover plate 3 includes a welded step cover plate 31 and an enhanced step cover plate 32. The thicknesses of the welded step cover plate 31 and the reinforced step cover plate 32 are respectively H1And H2. The width of the reinforced step cover plate 32 is equal to that of the runner 11 of the large-scale liquid cooling pipe network 1, so that the upper opening of the runner 11 can be completely sealed, the loss and leakage of heat exchange fluid are avoided, and the heat exchange and cooling performance is ensured.
The welded step cover plate 31 and the reinforced step cover plate 32 are integrally designed and formed.
The thicknesses of the welded step cover plate 31 and the reinforced step cover plate 32 are respectively H1And H2The method comprises the following steps:
step 1: the calculation assumes that when the structure is designed using a conventional planar cover plate 4, the thickness of the conventional planar cover plate 4 is H0＝0.243
Figure BDA0002681352580000031
Wherein L is0The maximum width of the flow channel 11 of the large-scale liquid cooling pipe network 1 is 100mm, P is the limit internal pressure of the flow channel 11 of the large-scale liquid cooling pipe network 1 and is 1MPa, and sigma is the allowable stress of the welding seam of the material used by the large-scale liquid cooling pipe network 1 and is 300 MPa. Determining the widest flow channel depth T when conventional planar cover plate design is used020mm and an allowable minimum depth T117.5mm, wherein T0>T1。
Step 2: the thickness H of the step cover 31 is welded11mm, wherein H1<H0。
And step 3: calculating the thickness H of the reinforced step cover 322＝(H0-H1) And K is 11.8mm (one significant digit after the decimal point is reserved for the calculation result). And K is a coefficient related to the width of the reinforced step cover plate 32, and according to mathematical analysis fitting and experimental verification of the stress state of the welding seam of the step cover plate 3 under the action of the internal pressure of the flow channel 11, when the width of the reinforced step cover plate 32 is equal to the width of the flow channel 11 of the large-scale liquid cooling pipe network 1, K is 0.6.
And 4, step 4: the size (H) of the step cover 3 to be calculated1＝1mm、H211.8mm) into the model of the liquid cooling network, and the cross-sectional area of the flow passage 11 is checked. At this time T0-(H1+H2-H0)<T1And the design requirements are not satisfied. Thus making H1＝H1+1mm, repeat steps 2-4. When H is present1＝5mm、H2＝(H0-H1) When the thickness/K is 5.2mm, T is satisfied0-(H1+H2-H0)≥T1And the cross section area of the flow passage meets the design requirement. The step cover plate 3 is the optimal structure.
In the liquid cooling structure with the variable cross-section flow passage (namely the liquid cooling pipe network of the invention), the thickness of the welded step cover plate 31 of the step cover plate 3 is kept unchanged, and the thickness of the reinforced step cover plate 32 is changed along with the change of the width L of the flow passage 11 of the large-scale liquid cooling pipe network 1, so that the weight reduction is realized to the maximum extent.
In the present embodiment, the secondary pipeline flow channel width L1 is 90mm, corresponding to that of the conventional flat cover plate 4Thickness of
Figure BDA0002681352580000041
P/sigma is 6.6 mm. Thus the thickness H of the secondary pipeline reinforcing step2＝(H0-H1) And K is 2.7 mm. Thickness H of reinforced step cover 322When the 5.2mm corresponding to the first-level pipeline is changed into the 2.7mm corresponding to the second-level pipeline, the inclined plane transition is adopted, the right-angle transition is avoided, and the stress concentration is reduced.
The embodiment also provides a welding method of the large-scale liquid cooling pipe network, which comprises the following steps:
step 1: selecting a stirring tool 5, wherein the length of the stirring pin 51 of the stirring tool 5 is C ═ H15mm guarantees to weld the ladder apron 31 and welds thoroughly, avoids the design condition because of the skew liquid cooling pipe network structure of the welding seam atress that leads to of not welding thoroughly. The diameter of the shaft shoulder 52 of the stirring tool 5 is 2H1～2.5H112mm in the middle, thereby reducing the welding heat input and reducing the welding deformation of the large-scale liquid cooling pipe network 1
Step 2: and cleaning the liquid cooling shell 2 and the step cover plate 3, and sequentially completing the assembly of the liquid cooling shell and the step cover plate, the assembly and the clamping of the large-scale liquid cooling pipe network 1 and the welding and fixing of the step cover plate 3.
And step 3: according to the size of the stirring tool 5, welding parameters (specifically including a small rotating speed, a large advancing speed, a small pressing amount and the like) with low heat input are selected for welding in a welding process window, so that the welding deformation is further reduced
And 4, step 4: and carrying out heat treatment on the belt tool to remove welding stress and further reduce welding deformation.
Example two
As shown in fig. 1 to 5, the embodiment provides a large-scale liquid cooling pipe network, which includes a liquid cooling housing 2 and a step cover plate 3, wherein the step cover plate 3 includes a welded step cover plate 31 and an enhanced step cover plate 32. The thicknesses of the welded step cover plate 31 and the reinforced step cover plate 32 are respectively H1And H2. The width of the reinforced step cover plate 32 is equal to that of the runner 11 of the large-scale liquid cooling pipe network 1, so that the upper opening of the runner 11 can be completely sealed, the loss and leakage of heat exchange fluid are avoided, and the heat exchange and cooling performance is ensured.
The welded step cover plate 31 and the reinforced step cover plate 32 are integrally designed and formed.
The thicknesses of the welded step cover plate 31 and the reinforced step cover plate 32 are respectively H1And H2The method comprises the following steps:
step 1: the calculation assumes that when the structure is designed using a conventional planar cover plate 4, the thickness of the conventional planar cover plate 4 is
Figure BDA0002681352580000051
Figure BDA0002681352580000052
P/sigma is 12 mm. Wherein L is0The maximum width of the flow channel 11 of the large-scale liquid cooling pipe network 1 is 120mm, P is the limit internal pressure of the flow channel 11 of the large-scale liquid cooling pipe network 1 and is 1MPa, and sigma is the allowable stress of the welding seam of the material used by the large-scale liquid cooling pipe network 1 and is 300 MPa. Determining the widest flow channel depth T when conventional planar cover plate design is used030mm and an allowable minimum depth T126mm, wherein T0>T1。
Step 2: the thickness H of the step cover 31 is welded11mm, wherein H1<H0。
And step 3: calculating the thickness H of the reinforced step cover 322＝(H0-H1) 18.3mm (/ K), one significant digit after the decimal point is reserved for the calculation. K is a coefficient related to the width of the reinforced step cover plate 32, and according to mathematical analysis fitting and experimental verification of the stress state of the welding seam of the step cover plate 3 under the action of the internal pressure of the flow passage 11, when the width of the reinforced step cover plate 32 is equal to the width of the flow passage 11 of the large-scale liquid cooling pipe network 1, K is 0.6.
And 4, step 4: the size (H) of the step cover 3 to be calculated1＝1mm、H218.3mm) into the liquid cooling pipe network model, and checking the cross-sectional area of the flow passage. At this time T0-(H1+H2-H0)<T1And does not meet the design requirements. Thus making H1＝H1+1mm, repeat steps 2-4. When H is present1＝6mm、H2＝(H0-H1) When the thickness/K is 10mm, T is satisfied0-(H1+H2-H0)≥T1And the design requirement of the cross section area of the flow passage is met. The step cover plate 3 is the optimal structure.
In the liquid cooling structure of the variable cross-section flow passage (namely the liquid cooling structure of the invention), the thickness of the welded step cover plate 31 of the step cover plate 3 is kept unchanged, and the thickness of the reinforced step cover plate 32 is changed along with the change of the width L of the flow passage 11 of the large-scale liquid cooling pipe network 1, so that the weight reduction is realized to the maximum extent.
In the present embodiment, the secondary pipeline flow channel width L1 is 80mm, which corresponds to the thickness of the conventional flat cover plate 4
Figure BDA0002681352580000053
P/sigma is 5.2 mm. Thus the thickness H of the secondary pipeline reinforcing step2＝(H0-H1) and/K is-1.3 mm, and is 0. Thickness H of reinforced step cover 322When the 5.2mm corresponding to the first-level pipeline is changed into the 0mm corresponding to the second-level pipeline, the inclined plane transition is adopted, so that the right-angle transition is avoided, and the stress concentration is reduced.
The embodiment also provides a welding method of the large-scale liquid cooling pipe network, which comprises the following steps:
step 1: selecting a stirring tool 5, wherein the length of the stirring pin 51 of the stirring tool 5 is C ═ H1Guarantee to weld the ladder apron 31 and weld through 6mm, avoid because of the skew liquid cooling pipe network structure's of the welding seam atress that the lack of weld through leads to the design condition. The diameter of the shaft shoulder 52 of the stirring tool 5 is 2H1～2.5H1And the thickness is 15mm, so that the welding heat input is reduced, and the welding deformation of the large-scale liquid cooling pipe network 1 is reduced.
Step 2: and cleaning the liquid cooling shell 2 and the step cover plate 3, and sequentially completing the assembly of the liquid cooling shell and the step cover plate, the assembly and the clamping of the large-scale liquid cooling pipe network 1 and the welding and fixing of the step cover plate 3.
And step 3: according to the size of the stirring tool 5, welding parameters with low heat input are selected for welding in a welding process window, and welding deformation is further reduced.
And 4, step 4: and carrying out heat treatment on the belt tool to remove welding stress and further reduce welding deformation.
In summary, in the large-scale liquid-cooled pipe network and the welding method thereof according to the above embodiments, the cover plate is designed as the step cover plate, and the design model based on the bearing capacity is established, so that the thickness of the cover plate to be welded is greatly reduced on the premise that the bearing capacity of the cover plate is not reduced, a finer stirring tool can be used in the welding process, and the welding heat input and the welding deformation are greatly reduced; the welding thickness of the designed step cover plate is greatly reduced, the solid space design change of two sides of the welding seam is caused, and the single-side width of the welding seam is equal to the welding thickness, so that the solid space of two sides of the welding seam is greatly reduced, the integration level of a large liquid cooling pipe network is improved, and the system weight is reduced; the cover plate design of the multistage flow channel in the large-scale liquid cooling pipe network is changed, so that the flow channel with the small cross section can be designed into an enhanced step with smaller thickness, and the weight of the system is further reduced; the quantitative design method of the step cover plate is provided, the structural size of the cover plate can be quantitatively designed according to parameters such as the width of a large liquid cooling pipe network flow passage, the limit internal pressure, the allowable stress of a welding seam of a used material and the like, the structural redundancy design is greatly reduced, and the reliability of a welding structure is ensured; the inclined surface transition is adopted at the position of the thickness change of the reinforced step, so that the stress concentration of the flow channel can be greatly reduced, and the reliability of the system is improved; by adopting the stirring tool required by the invention, the welding heat input can be further reduced while the root of the welding line is ensured to be welded through, so that the structural deformation is reduced, and the stirring tool is worthy of being popularized and used.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A large-scale liquid cooling pipe network which characterized in that: the liquid cooling device comprises a liquid cooling shell and a step cover plate, wherein the step cover plate comprises a welded step cover plate and a reinforced step cover plate, the reinforced step cover plate comprises a plurality of steps corresponding to all stages of pipelines in a flow channel, each step and the welded step cover plate are integrally formed, the width of each step is correspondingly equal to the width of each stage of pipeline, each step is directly contacted with heat exchange fluid in each stage of pipeline, and the liquid cooling shell and the step cover plate are welded through stirring friction to form a liquid cooling pipe network;
the thicknesses of the welded stepped cover plate and the reinforced stepped cover plate are respectively equal to H1And H2The specific calculation process is as follows:
s11: calculating the thickness H of the conventional plane cover plate when the conventional plane cover plate is adopted for design0(ii) a Determining the widest flow channel depth T when conventional planar cover plate design is used0And an allowable minimum depth T1Wherein T is0>T1；
S12: thickness H of selectively welded step cover plate1Let H11mm, wherein H1<H0；
S13: calculating the thickness H of the reinforced step cover plate2；
S14: substituting the calculated size of the step cover plate into the liquid cooling pipe network model, and checking whether the cross-sectional area of the runner meets the design requirement; when T is0-(H1+H2-H0)<T1If the design requirement is not satisfied, let H1＝H1+1mm, repeat S12-S14 until T is satisfied0-(H1+H2-H0)≥T1And then, the cross section area of the flow channel meets the design requirement, and the step cover plate at the moment is determined to be the optimal structure.
2. The large scale liquid cooled piping network of claim 1, wherein: in the step S11, in the above step,
Figure FDA0003268800360000011
wherein L is0The maximum width of each pipeline of the large-scale liquid cooling pipe network is shown, P is the limit internal pressure of a flow passage of the large-scale liquid cooling pipe network, and sigma is the allowable stress of a welding seam of a material used by the large-scale liquid cooling pipe network.
3. The large scale liquid cooled piping network of claim 1, wherein:in the step S13, H2＝(H0-H1) and/K, wherein K is a coefficient related to the width of the reinforced step cover plate.
4. The large scale liquid cooled piping network of claim 3, wherein: each stage of pipeline forms a flow channel, and when the width of the reinforced step cover plate is equal to that of the flow channel, K is 0.6.
5. The large scale liquid cooled piping network of claim 1, wherein: when the thickness of the reinforced step cover plate is changed, the steps are in inclined surface transition.
6. A welding method for a large-scale liquid-cooled pipe network, which is used for welding the large-scale liquid-cooled pipe network according to any one of claims 1 to 5, and comprises the following steps:
s21: selecting a stirring tool;
s22: cleaning the liquid cooling shell and the step cover plate, and sequentially completing assembly of the liquid cooling shell and the step cover plate, large-scale liquid cooling pipe network assembling and clamping and step cover plate fixing;
s23: according to the size of the stirring tool, selecting low-heat-input welding parameters for welding in a welding process window;
s24: carrying out heat treatment with the tool to remove welding stress.
7. The method of claim 6, wherein the method comprises: in the step S21, the length of the stirring pin of the stirring tool is equal to H1The diameter of the shaft shoulder of the stirring tool is 2H1～2.5H1。
8. The method of claim 6, wherein the method comprises: in step S22, the step cover plate is fixed in position by a welding tool during welding.
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CN209472934U (en) * 2018-10-29 2019-10-08 东风航盛（武汉）汽车控制***有限公司 Reinforce the liquid cooling heat radiator of cover plate for sealing
CN110598266A (en) * 2019-08-16 2019-12-20 中国电子科技集团公司第三十八研究所 Welding runner structure of liquid cooling assembly

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CN110598266A (en) * 2019-08-16 2019-12-20 中国电子科技集团公司第三十八研究所 Welding runner structure of liquid cooling assembly

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