CN110434500A - Rail vehicle pilot beam weld industry device and method - Google Patents
Rail vehicle pilot beam weld industry device and method Download PDFInfo
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- CN110434500A CN110434500A CN201910687959.XA CN201910687959A CN110434500A CN 110434500 A CN110434500 A CN 110434500A CN 201910687959 A CN201910687959 A CN 201910687959A CN 110434500 A CN110434500 A CN 110434500A
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- pilot beam
- pilot
- tooling
- backing plate
- tooling ontology
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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
- B23K31/003—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 controlling of welding distortion
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/006—Vehicles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The present invention relates to rail vehicle pilot beam welding technology fields, provide rail vehicle pilot beam weld industry device and method.Rail vehicle pilot beam weld industry device, comprising: pilot beam rigidly fixes tooling, including tooling ontology and is set to the compacting part of tooling ontology；Reversible deformation backing plate is installed on tooling ontology, the middle part setting of corresponding pilot beam；Press machine, including at least two formed punches and gantry support, gantry support include top beam of the straddle mounting between pilot beam both ends, and formed punch is moved and fixed along top beam, and gantry support is moved and fixed along the direction perpendicular to top beam.This kind of rail vehicle pilot beam weld industry device, so that without lower fiery adjusting after pilot beam welding procedure, fiery adjusting bring manpower, time cost are saved under postwelding, and then adjusting process is cumbersome after solving the problems, such as pilot beam welding completion of the existing technology.
Description
Technical field
The present invention relates to rail vehicle pilot beam welding technology field more particularly to rail vehicle pilot beam welding deformation controls
Device and method processed.
Background technique
Pilot beam is important connection and stressed member in aluminium alloy multiple unit train body.Pilot beam hang oneself hang it is standby more, in reality
It is more demanding to every size such as pilot beam flatness in the production of border.And in the production of existing vehicle, because pilot beam welding capacity is larger, knot
Structure is irregular, and post-weld stress is concentrated, so that flatness is generally overproof after the completion of pilot beam welding, and deformation disunity, portion
Pilot beam is divided to be bent towards sleeper beam direction, partial buffer beam is towards lateral bend outside pilot beam, so that adjusting construction is extremely difficult.And it buffers
Technique is more demanding after the completion of beam welding: the flatness of the flatness 2mm/2m, lower plane that go up plane and facade are 1mm/m, are delayed
Rushing beam does not allow downwarp integrally.The prior art is unable to satisfy above-mentioned only by rail vehicle pilot beam weld industry device
It is required that generally requiring repeatedly to be adjusted the pilot beam after welding, and then its technique is cumbersome.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
One of purpose of the invention is: a kind of rail vehicle pilot beam weld industry device and method is provided,
Adjusting process is cumbersome after solving the problems, such as pilot beam welding completion existing in the prior art.
In order to realize the purpose, the present invention provides a kind of rail vehicle pilot beam weld industry devices, comprising:
Pilot beam rigidly fixes tooling, including tooling ontology and is set to the compacting part of the tooling ontology；
Reversible deformation backing plate is installed on the tooling ontology, the middle part setting of corresponding pilot beam；
Press machine, including at least two formed punches and gantry support, the gantry support include straddle mounting in pilot beam both ends
Between top beam, formed punch moves and fixes along the top beam, and the gantry support is along the direction fortune perpendicular to the top beam
It moves and fixes.
In one embodiment, the quantity of the compacting part is six, setting in the middle part of four correspondences tooling ontology,
Two correspondence tooling ontology both ends settings.
In one embodiment, the tooling ontology includes horizontal supporting plate and vertical plate, and the reversible deformation backing plate includes
It is set to the first backing plate of the vertical plate and is set to the second backing plate of the horizontal supporting plate, first backing plate is corresponding slow
The junction setting of beam and draw beam is rushed, second backing plate is located at the outside of first backing plate.
In order to realize the purpose, the present invention provides a kind of rail vehicle pilot beam welding deformation controlling methods, comprising:
Pilot beam is fixed on pilot beam to rigidly fix in tooling；
To pilot beam reversed deformation；
Pilot beam and draw beam are welded and fixed；
Pressurization adjusting is carried out to pilot beam.
It is in one embodiment, described pilot beam is fixed on pilot beam to rigidly fix step in tooling, comprising:
It is symmetrical arranged six compacting parts on the tooling ontology that pilot beam rigidly fixes tooling, including is located at tooling ontology
Four compacting parts at middle part, and two compacting parts positioned at tooling ontology both ends；
Pilot beam is fixed on tooling ontology using compacting part.
In one embodiment, the step of reversed deformation to pilot beam, comprising:
Pilot beam is corresponded in the tooling ontology that pilot beam rigidly fixes tooling and the first backing plate is arranged in draw beam junction.
In one embodiment, the step of reversed deformation to pilot beam, comprising:
In the two sides of corresponding first backing plate of tooling ontology, the second backing plate is set.
In one embodiment, described the step of pilot beam and draw beam are welded and fixed, comprising:
Weld seam between pilot beam and draw beam is welded；
By center to two sides on the outside of pilot beam and gusset bottom surface weld seam and facade weld seam weld；
By center to two sides on the inside of pilot beam and gusset bottom surface weld seam and facade weld seam weld；
Pilot beam is overturn using welding positioner；
It is welded by bottom surface weld seam of the center to two sides to pilot beam and gusset.
In one embodiment, in described the step of pilot beam and draw beam are welded and fixed, alternately to pilot beam two sides
Weld seam welded.
In one embodiment, described the step of pressurization adjusting is carried out to pilot beam, comprising:
Pressurization adjusting is carried out to pilot beam two sides using double end press machine.
Technical solution of the present invention has the advantage that this kind of rail vehicle pilot beam weld industry dress of the invention
It sets, so that fiery adjusting bring manpower, time cost under postwelding are saved without lower fiery adjusting after pilot beam welding procedure, into
And adjusting process is cumbersome after solving the problems, such as pilot beam welding completion of the existing technology.Specifically by rigid in pilot beam
Property fixing tool on compacting part is rationally set, ensure that effective fixation to pilot beam before weldering.Also, pass through reversible deformation backing plate
To pilot beam reversed deformation, guarantee that pilot beam group postwelding meets technique requirement.And weld after by press machine to pilot beam into
Row pressurization adjusting, avoids postwelding downwarp trend bring adverse effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is that the pilot beam of the embodiment of the present invention rigidly fixes the overlooking structure diagram of tooling；
Fig. 2 is that the pilot beam of the embodiment of the present invention rigidly fixes the positive structure diagram of tooling；
Fig. 3 is that the pilot beam of the embodiment of the present invention rigidly fixes the side structure schematic view of tooling；
Fig. 4 is the press machine of the embodiment of the present invention and pilot beam rigidly fixes the schematic elevation view that tooling is assembled；
Fig. 5 is the press machine of the embodiment of the present invention and pilot beam rigidly fixes the schematic side view that tooling is assembled；
In figure: 1, tooling ontology；2, compacting part；3, press machine；301, formed punch；302, gantry support.
Specific embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following embodiment is used for
Illustrate the present invention, but cannot be used to limit the scope of the invention.
In the description of the present invention, it should be noted that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second ", " third " are used for description purposes only, and it should not be understood as instruction or dark
Show relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connected " " connects
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
According to an embodiment of the invention, rail vehicle pilot beam weld industry device is provided to Fig. 5 referring to Figure 1,
Tooling, reversible deformation backing plate and press machine 3 are rigidly fixed including pilot beam.It is found by figure to Fig. 3, pilot beam rigidly fixes tooling
Including tooling ontology 1 and it is set to the compacting part 2 of tooling ontology 1.Reversible deformation backing plate is installed on tooling ontology 1, and contravariant
Shape backing plate corresponds to the middle part setting of pilot beam.Press machine 3 includes at least two formed punches 301 and gantry support 302, gantry support
302 include top beam of the straddle mounting between pilot beam both ends, and formed punch 301 is moved and fixed along top beam.In addition, gantry support 302
It moves and fixes along the direction perpendicular to top beam.Wherein, perpendicular to the direction of top beam namely the length direction of tooling ontology 1,
Namely left and right extending direction in Fig. 5.
This kind of rail vehicle pilot beam weld industry device, so that lower fiery adjusting is not necessarily to after pilot beam welding procedure,
Fiery adjusting bring manpower, time cost under postwelding are saved, and then solves pilot beam welding completion of the existing technology
The cumbersome problem of adjusting process afterwards.Specifically compacting part 2 is rationally set by rigidly fixing in pilot beam in tooling, ensure that
Effective fixation before weldering to pilot beam.Also, pilot beam group postwelding is guaranteed to pilot beam reversed deformation by reversible deformation backing plate
Meet technique requirement.And pressurization adjusting is carried out to pilot beam by press machine 3 after welding, avoid postwelding downwarp trend bring
Adverse effect.
Wherein, " middle part of pilot beam " is the concept at opposite " pilot beam both ends ", as long as namely positioned at pilot beam both ends
Between, " middle part of pilot beam " can be referred to as, it is not required that be middle position.
Pilot beam rigidly fixes the structure of tooling-Fig. 3 referring to Figure 1, and the quantity of compacting part 2 is six, wherein four
The both ends setting of two corresponding tooling ontologies 1 is left in the middle part setting of corresponding tooling ontology 1.Six are arranged by this kind of mode
Compacting part 2, and then rigidly fixed by increase to control pilot beam welding deformation.Four be arranged in the middle part of corresponding tooling ontology 1
A compacting part 2 is symmetrical arranged, and the bars position setting of corresponding pilot beam, since pilot beam is provided with structural strength at gusset
Larger, compacting part 2 is arranged in corresponding bars position, can damage to avoid to pilot beam.
By lot of experiment validation, pilot beam of the Fig. 1 into Fig. 3 rigidly fixes tooling, and the setting of 2 position of compacting part is closed
Reason ensure that the preceding effective fixation to pilot beam of weldering.
It should be noted that the quantity of compacting part 2 and distribution are not limited by the accompanying figures, as long as pilot beam can be consolidated
Due on tooling ontology 1.
The concrete form of compacting part 2 is unrestricted.For example, compacting part 2 can use compactor, it can also be using card
It is blue.Wherein, for compared to compactor, the pressing force for blocking orchid is smaller, and time-consuming and laborious and effect is poor.
Further, it includes horizontal supporting plate and vertical plate, reversible deformation pad that pilot beam, which rigidly fixes the tooling ontology 1 of tooling,
Plate includes the first backing plate for being set to vertical plate and the second backing plate for being set to horizontal supporting plate, the first backing plate correspond to pilot beam and
The junction of draw beam is arranged, and the second backing plate is located at the outside of the first backing plate.
Wherein, the outside in " outside that the second backing plate is located at the first backing plate " is equally using the longitudinally asymmetric axis of draw beam as base
It is quasi-.It is closely "inner" apart from the longitudinally asymmetric axis of draw beam, otherwise is "outside", is no longer described in detail herein.
After the completion of pilot beam rigidly fixes frock making, existing vehicle verifying reversible deformation incrementss and increase contravariant shaped position, warp
Experimental verification repeatedly, it is final to determine that most reasonable reversible deformation size and reversible deformation increase position.Specifically, the first backing plate can use
With a thickness of the structure of 2mm, the second backing plate can be using the structure with a thickness of 6mm, and then by using corresponding first backing plate and the
Two backing plate reversed deformations control pilot beam welding deformation.
Fig. 5 is referred to, since the tooling ontology 1 that pilot beam rigidly fixes tooling has certain length, and then in tooling sheet
Multiple pilot beams can be fixed on body 1 simultaneously.In turn, (vertical along the length direction of tooling ontology 1 by gantry support 302
In the direction of the top beam) it moves and fixes, the adjustment to multiple pilot beams may be implemented.
According to an embodiment of the invention, providing a kind of rail vehicle pilot beam welding deformation controlling method, comprising:
Pilot beam is fixed on pilot beam to rigidly fix in tooling；
To pilot beam reversed deformation；
Pilot beam and draw beam are welded and fixed；
Pressurization adjusting is carried out to pilot beam.
Without lower fiery adjusting after pilot beam can be made to weld through the above steps, and then solve of the existing technology slow
Rush the problem that adjusting process is cumbersome after beam welding is completed.Specifically rigidly fixing tooling by pilot beam ensure that weldering is preceding to slow
Rush effective fixation of beam.Also, by guaranteeing that pilot beam group postwelding meets technique requirement to pilot beam reversed deformation.And lead to
Pressurization adjusting is carried out to pilot beam after crossing welding, avoids postwelding downwarp trend bring adverse effect.
In one embodiment, pilot beam is fixed on pilot beam and rigidly fixes step in tooling, comprising:
It is symmetrical arranged six compacting parts 2 on the tooling ontology 1 that pilot beam rigidly fixes tooling, including is located at tooling sheet
Four compacting parts 2 at 1 middle part of body, and two compacting parts 2 positioned at 1 both ends of tooling ontology；
Pilot beam is fixed on tooling ontology 1 using compacting part 2.
By lot of experiment validation, it is arranged by six compacting parts 2 such as above method, the setting of 2 position of compacting part
Rationally, it ensure that the preceding effective fixation to pilot beam of weldering.
In one embodiment, to pilot beam reversed deformation the step of, comprising:
In the first pad of junction setting of the corresponding pilot beam of tooling ontology 1 and draw beam that pilot beam rigidly fixes tooling
Plate.
Further, to pilot beam reversed deformation the step of, comprising:
In the two sides for corresponding first backing plate of tooling ontology 1 that pilot beam rigidly fixes tooling, the second backing plate is set.
Above to pilot beam reversed deformation the step of, is provided to guarantee that pilot beam group postwelding meets technique requirement.It is existing
Vehicle verifies reversible deformation incrementss and increases contravariant shaped position, through experimental verification repeatedly, it is final determine most reasonable reversible deformation size and
Reversible deformation increases position, and then increases position referring to most reasonable reversible deformation size and reversible deformation, rigidly fixes tooling in pilot beam
1 corresponding position of tooling ontology be arranged reversible deformation component (including the first backing plate and second backing plate), controlled by preset reversible deformation
Pilot beam welding deformation.
In one embodiment, the step of pilot beam and draw beam being welded and fixed, comprising:
Weld seam between pilot beam and draw beam is welded；
By center to two sides on the outside of pilot beam and gusset bottom surface weld seam and facade weld seam weld；
By center to two sides on the inside of pilot beam and gusset bottom surface weld seam and facade weld seam weld；
Pilot beam is overturn using welding positioner；
It is welded by bottom surface weld seam of the center to two sides to pilot beam and gusset.
In welding process, first the weld seam between pilot beam and draw beam is welded, realize pilot beam and draw beam it
Between fixation.
Further, " by center to two sides on the outside of pilot beam and gusset bottom surface weld seam and facade weld seam weld "
In step, what bottom surface weld seam referred to is the weld seam extended in the horizontal plane or on approximately horizontal plane, and what facade weld seam referred to
It is the weld seam extended on vertical plane or near vertical face." gusset on the outside of " be on the basis of the longitudinally asymmetric axis of draw beam,
The side closer apart from the longitudinally asymmetric axis of draw beam is on the inside of gusset, and the side remoter apart from the longitudinally asymmetric axis of draw beam is gusset
Outside.
After bottom surface weld seam and the welding of facade weld seam are completed, then still remaining top surface weldering between pilot beam and its gusset
It stitches unwelded.And at this time by overturning pilot beam, so that top surface weld seam is transformed into bottom surface weld seam.In the case of this kind, adopt
The welding of remaining weld seam can be completed with same path, and then is convenient for the control of welding process.
Wherein, in order to realize the overturning of pilot beam, other than using positioner is welded, any prior art can also be used
Disclosed in and may be implemented pilot beam overturning product.
Wherein, in the step of pilot beam is Bilateral Symmetry structure, and pilot beam and draw beam are welded and fixed, alternately to buffering
The weld seam of beam two sides is welded.For example, " by center to two sides to the bottom surface weld seam and facade weld seam on the outside of pilot beam and gusset
Welded " the step of in, first weld a weld seam of wherein side, welded later with the symmetrical other side of this weld seam
Weld seam, so alternately, all weld seams until completing two sides.The method that this kind alternately welds, can avoid welding as far as possible
Pilot beam or draw beam generate moderate finite deformation in journey.
In one embodiment, the step of pressurization adjusting being carried out to pilot beam, comprising:
Pressurization adjusting is carried out to pilot beam two sides using double end press machine 3.
Fig. 4 is referred to, pressurization adjusting is carried out to pilot beam two sides by using double end press machine 3, it is ensured that buffer after adjusting
It is scratched on beam two sides are uniform, avoids security risk caused by moving repeatedly pressure head when single head adjusting and pressurizeing；And double end press machine 3
Formed punch 301 moved by Electronic control, avoid by hand push it is time-consuming and laborious, improve labor efficiency.
By the above rail vehicle pilot beam welding deformation controlling method, after the completion of beam welding to be buffered, pilot beam remains unchanged
There are the deformation tendencies of downwarp, want for flatness on chassis after process chassis flooring process construction after guarantee and floor welded
It asks, aluminium alloy motor-car pilot beam does not allow pilot beam downwarp when surrendering.Therefore double end press machine 3 is used, while to pilot beam two
Side carries out pressurization adjusting, it is ensured that after adjusting pilot beam two sides can uniformly on scratch, guarantee quality.
Above-mentioned rail vehicle pilot beam weld industry device and method, by increase rigid constraint, reversed deformation,
Change a series of measures such as welding sequence, overcomes pilot beam post welding distortion problem, be effectively guaranteed welding quality and reach work
Skill requirement.By taking the manufacture of high speed motor car group aluminum alloy pilot beam as an example, by using above-mentioned rail vehicle pilot beam welding deformation control
Device and method processed avoids in welding process because welding capacity leads to greatly the problem that deflection is big after automatic welding, eliminates welding and become
Shape amount hidden danger of quality brought greatly, substantially increases product quality.
The above embodiments are only used to illustrate the present invention, rather than limitation of the present invention.Although referring to embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, to technical solution of the present invention carry out it is various combination,
Modification or equivalent replacement should all cover and want in right of the invention without departure from the spirit and scope of technical solution of the present invention
It asks in range.
Claims (10)
1. a kind of rail vehicle pilot beam weld industry device characterized by comprising
Pilot beam rigidly fixes tooling, including tooling ontology and is set to the compacting part of the tooling ontology；
Reversible deformation backing plate is installed on the tooling ontology, the middle part setting of corresponding pilot beam；
Press machine, including at least two formed punches and gantry support, the gantry support include straddle mounting between pilot beam both ends
Top beam, formed punch moves and fixes along the top beam, and the gantry support moves simultaneously along the direction perpendicular to the top beam
It is fixed.
2. rail vehicle pilot beam weld industry device according to claim 1, which is characterized in that the compressed part
The quantity of part is six, setting in the middle part of four correspondences tooling ontology, two correspondence tooling ontology both ends settings.
3. rail vehicle pilot beam weld industry device according to claim 1, which is characterized in that the tooling sheet
Body includes horizontal supporting plate and vertical plate, and the reversible deformation backing plate includes being set to the first backing plate of the vertical plate and being set to
Second backing plate of the horizontal supporting plate, first backing plate corresponds to pilot beam and the junction of draw beam is arranged, and described second
Backing plate is located at the outside of first backing plate.
4. a kind of rail vehicle pilot beam welding deformation controlling method characterized by comprising
Pilot beam is fixed on pilot beam to rigidly fix in tooling；
To pilot beam reversed deformation；
Pilot beam and draw beam are welded and fixed；
Pressurization adjusting is carried out to pilot beam.
5. according to the method described in claim 4, it is characterized in that, described be fixed on pilot beam for pilot beam and rigidly fix tooling
On step, comprising:
It is symmetrical arranged six compacting parts on the tooling ontology that pilot beam rigidly fixes tooling, including is located in the middle part of tooling ontology
Four compacting parts, and two compacting parts positioned at tooling ontology both ends；
Pilot beam is fixed on tooling ontology using compacting part.
6. according to the method described in claim 4, it is characterized in that, the step of the reversed deformation to pilot beam, comprising:
Pilot beam is corresponded in the tooling ontology that pilot beam rigidly fixes tooling and the first backing plate is arranged in draw beam junction.
7. according to the method described in claim 6, it is characterized in that, the step of the reversed deformation to pilot beam, comprising:
In the two sides of corresponding first backing plate of tooling ontology, the second backing plate is set.
8. according to the method described in claim 4, it is characterized in that, described the step of pilot beam and draw beam are welded and fixed,
Include:
Weld seam between pilot beam and draw beam is welded；
By center to two sides on the outside of pilot beam and gusset bottom surface weld seam and facade weld seam weld；
By center to two sides on the inside of pilot beam and gusset bottom surface weld seam and facade weld seam weld；
Pilot beam is overturn using welding positioner；
It is welded by bottom surface weld seam of the center to two sides to pilot beam and gusset.
9. according to the method described in claim 8, it is characterized in that, described the step of pilot beam and draw beam are welded and fixed
In, alternating welds the weld seam of pilot beam two sides.
10. according to the method described in claim 4, it is characterized in that, described the step of carrying out pressurization adjusting to pilot beam, packet
It includes:
Pressurization adjusting is carried out to pilot beam two sides using double end press machine.
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| CN201910687959.XA CN110434500A (en) | 2019-07-29 | 2019-07-29 | Rail vehicle pilot beam weld industry device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111618399A (en) * | 2020-06-12 | 2020-09-04 | 中国二十二冶集团有限公司 | Welding-prevention shrinkage deformation receiving method for manhole of box-type steel column |
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Application publication date: 20191112 |