CN107378288B - Intensive welding method for base of giant complex multi-cavity test platform - Google Patents
Intensive welding method for base of giant complex multi-cavity test platform Download PDFInfo
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- CN107378288B CN107378288B CN201710313349.4A CN201710313349A CN107378288B CN 107378288 B CN107378288 B CN 107378288B CN 201710313349 A CN201710313349 A CN 201710313349A CN 107378288 B CN107378288 B CN 107378288B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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Abstract
The invention discloses a large complex multi-cavity test platform base intensive welding method, wherein a test platform base is formed by welding installation units, and the installation units are prefabricated in a factory by steel plates; the welding method comprises the following steps: step 1, preprocessing a welding groove of an installation unit; step 2, pre-assembling the installation units into a whole, and setting mechanical connection among the installation units; step 3, performing preheating treatment on the welding seam position of the mounting unit before welding; step 4, welding the mounting units according to the established welding process and welding sequence; and 5, carrying out post-heating treatment on the welding seam of the mounting unit after welding. The method of the invention ensures the welding contraction consistency of the welding seam of the large-scale steel structure by processing each welding part before welding, determining the welding sequence and the welding process parameters and adopting the matched mechanical connection in the welding process, and controls the welding deformation to the minimum to meet the welding precision requirement of the base.
Description
Technical Field
The invention relates to a dense welding method for a large complex multi-cavity test platform base.
Background
The large-scale test platform comprises back timber, stand, movable cross beam and base, and the base is as test platform's basis to whole large-scale test platform influence is great. The test platform base not only needs higher intensity and rigidity, but also needs very high precision simultaneously, guarantees that the other parts of the test platform based on the base satisfy the installation demand. The large-scale test platform base structure is huge, and the preparation of base is formed by 9 complicated multicavity steel construction installation units splice welding, and the welding volume is big, and the welding process requires that the assembly precision of installation unit is high. The weld joint and the heat affected zone thereof generated by welding have large residual stress and stress concentration, and the existence of the residual stress and the stress concentration can finally cause the deformation and the cracking of the base and reduce the bearing capacity of the base.
Disclosure of Invention
The invention aims to provide a large complex multi-cavity test platform base intensive welding method to solve the problems of residual stress and stress concentration of products prepared by the existing welding method at the position of a welding seam.
The technical scheme for solving the technical problems is as follows: a large complex multi-cavity test platform base intensive welding method is characterized in that a test platform base is formed by welding installation units, and the installation units are prefabricated in a factory by steel plates; preferably, the test platform base comprises two first mounting units, two second mounting units, two third mounting units, a fourth mounting unit, a fifth mounting unit and a sixth mounting unit; the fourth mounting unit and the fifth mounting unit are vertically butted to form a first combination, and the second mounting units are respectively mounted on two sides of the first combination to form a cross-shaped second combination; the first mounting unit is mounted at one pair of diagonal positions of the second combination, and the third mounting unit is mounted at the other pair of diagonal positions of the second combination; the sixth mounting unit is mounted on the upper part of the fifth mounting unit and is positioned between the first mounting unit and the third mounting unit; the first mounting unit and the third mounting unit are respectively mounted on the vibration isolation support of the concrete buttress; the horizontal height of the lower edge of the second assembly is higher than the horizontal height of the lower edges of the first installation unit and the third installation unit, so that the bottom of the second assembly forms a cross stiffening frame.
The welding method comprises the following steps:
preferably, the specific process of the step 1 is that the same type of welding seams of the installation unit are processed by a beveling machine tool before the installation unit leaves a factory, so that the specifications and the sizes of the same type of welding seams are kept consistent.
preferably, the specific process of the step 2 is that 9 mounting units of the test platform base are pre-assembled into a whole, and mechanical connection is arranged at the upper part, the bottom and the inside of the assembled base to prevent deformation in the welding process; arranging constraint plates at two sides of the welding line in each installation unit for fixation; and a restraint plate is respectively arranged at the central part of four sides of each cavity of the welding line between the fourth mounting unit and the fifth mounting unit, and restraint plates are arranged at intervals of 1m on the vertical welding lines between other blocks. More preferably, gusset plates are welded at the corners of the cavity of each mounting unit of the base of the test platform, and the gusset plates are arranged diagonally, so that each cross node position has 2 gusset plates.
preferably, the specific process of the step 3 is that each welding line of the installation unit is heated, the preheated heating areas are arranged at two sides of the welding groove, the width of each heating area is more than 1.5 times of the thickness of the welding position of the weldment, and the minimum width is not less than 100 mm.
preferably, the specific process of the step 4 is that the mounting sequence of the test platform base is to assemble the middle cross stiffening girder part by tailor welding, namely the second mounting units are respectively mounted at the two sides of the fourth mounting unit; the fifth installation unit is installed at the upper part of the cross stiffening girder, and finally four corner column parts, namely the first installation unit and the third installation unit, are installed, and finally the sixth installation unit is installed; the whole welding sequence of the test platform base follows a primary welding seam and a secondary welding seam; diffusion welding from inside to outside; and the welding sequence of integral symmetrical synchronous welding and overlength welding line subsection synchronous welding. More preferably, the specific process of step 4 further comprises controlling the temperature of the base material of the welding area in the continuous welding process to control the interlayer temperature between 120 ℃ and 150 ℃; when the welding is interrupted, the re-preheating temperature is higher than the initial preheating temperature when the welding is carried out again; and monitoring by using an infrared thermometer in the welding process, and when the welding temperature of the welding seam is lower than the lowest value of the required range, heating to the specified requirement and then welding.
And 5, carrying out post-heating treatment on the welding seam of the mounting unit after welding.
Preferably, the specific process of the step 5 is that after welding is finished, electric heating treatment is carried out on the welding seams to eliminate welding residual stress, the whole heat treatment sequence is consistent with the welding sequence of the base in blocks, and the electric heating treatment is carried out on the welding seams one by one. More preferably, the heat treatment equipment for performing electric heating treatment is electric heating equipment, a heating plate and heat preservation cotton; a thermocouple sensor is welded at a heating position to be provided with temperature control points, and each three heating plates are provided with one temperature control point.
The invention has the beneficial effects that:
the method of the invention ensures the welding contraction consistency of the welding seam of the large-scale steel structure by processing each welding part before welding, determining the welding sequence and the welding process parameters and adopting the matched mechanical connection in the welding process, and controls the welding deformation to the minimum to meet the welding precision requirement of the base.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative, not limiting of the invention, and in which:
FIG. 1 is an exploded view of a mounting unit of a test platform base according to an embodiment of the present invention;
FIG. 2 is a schematic view of an assembly of a mounting unit of a base of a test platform according to an embodiment of the present invention;
FIG. 3 is a schematic view of a fourth mounting unit and a fifth mounting unit weld constraining plate arrangement;
FIG. 4 is a schematic view of a weld plate;
FIG. 5 is a fourth and fifth mounting unit lower longitudinal main weld 1 welding method;
FIG. 6 is a fourth and fifth installation unit lower longitudinal primary weld 2, 3 welding method;
FIG. 7 is a lower middle transverse bead welding method of the fourth mounting unit and the fifth mounting unit;
FIG. 8 is a fourth and fifth mounting unit lower longitudinal primary weld 4, 5 welding method;
FIG. 9 is a fourth mounting unit and fifth mounting unit external interface welding method;
figure 10 is a method of welding the second mounting unit to the fourth and fifth mounting units,
FIG. 11 is a welding method of the first and third mounting units and the fourth and fifth mounting units,
FIG. 12 is a method of welding the second mounting unit to the first and third mounting units;
FIG. 13 is a weld temperature control curve;
fig. 14 is a schematic view of a gusset arrangement at a cavity corner of the fourth mounting unit and the fifth mounting unit.
In the drawings, the components represented by the respective reference numerals are listed below:
11. a first mounting unit, 12, a second mounting unit, 13, a third mounting unit, 14, a fourth mounting unit, 15, a fifth mounting unit, 16, a sixth mounting unit, 21, a first steel plate for forming a mounting unit, 22, a second steel plate for forming a mounting unit, 23, a restraint plate, 24, a first direction weld, 25, a second direction weld, 26, a diagonal web, 27, a gusset.
Detailed Description
Hereinafter, embodiments of the macro complex multi-chamber test platform base intensive welding method of the present invention will be described with reference to the accompanying drawings.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.
FIGS. 1 and 2 show a large complex multi-chamber test platform base structure according to an embodiment of the present invention, the test platform base is formed by welding mounting units, and the mounting units are prefabricated in a factory by using steel plates; preferably, the test platform base comprises two first mounting units 11, two second mounting units 12, two third mounting units 13, a fourth mounting unit 14, a fifth mounting unit 15 and a sixth mounting unit 16; the fourth mounting unit 14 and the fifth mounting unit 15 are butted up and down to form a first combination, and the upper part of the fifth mounting unit 15 is used for mounting a sliding flat plate; the second mounting units 12 are respectively mounted on two sides of the first assembly to form a cross-shaped second assembly; the first mounting unit 11 is mounted at one pair of diagonal positions of the second combination, and the third mounting unit 13 is mounted at the other pair of diagonal positions of the second combination; the sixth mounting unit 16 is mounted on the upper portion of the fifth mounting unit 15 between the first mounting unit 11 and the third mounting unit 13; the first mounting unit 11 and the third mounting unit 13 are respectively mounted on the vibration isolation support of the concrete buttress; the lower edge of the second assembly has a level higher than the levels of the lower edges of the first and third mounting units 11 and 13, so that the bottom of the second assembly forms a cross stiffener.
The test platform base adopts a block type structure, so that the problem that the test platform base is large in size and difficult to integrally weld and assemble is solved. And simultaneously, the horizontal height of the lower edge of the second assembly is higher than the horizontal heights of the lower edges of the first mounting unit and the third mounting unit, so that the bottom of the second assembly forms a cross stiffening frame. The stiffening frame reasonably utilizes the thickness space formed by the concrete buttress and the vibration isolation support, and improves the durability and the strength of the base on the premise of not increasing the overall height. In addition, a prestressed cable is conveniently arranged in concrete in the cross stiffening frame at the bottom of the second assembly in subsequent construction, and the base concrete is prevented from being cracked under tension under a large test load.
The welding method comprises the following steps:
in a preferred embodiment, the specific process of the step 1 is that the same type of welding seams of the installation unit are processed by a beveling machine tool before the installation unit leaves a factory, so that the specifications and the sizes of the same type of welding seams are kept consistent. The advantage of performing the above process is that the consistency of the weld shrinkage of the various identical welds can be ensured. The welding form of the installation unit mainly comprises a transverse welding form and a vertical welding form, and the groove form mainly comprises a single-side V-shaped form, a single-side K-shaped form, a single-side X-shaped form and the like.
in the preferred embodiment, the specific process of the step 2 is that 9 mounting units of the test platform base are pre-assembled into a whole, and mechanical connection is arranged at the upper part, the bottom and the inside of the assembled base to prevent deformation in the welding process; two sides of the welding line in each installation unit are provided with a restraint plate 23 for fixation; as shown in fig. 3, a restraint plate is respectively arranged at the central part of four sides of each cavity by a welding seam between the fourth mounting unit and the fifth mounting unit, and a restraint plate is arranged at intervals of 1m by vertical welding seams between other blocks. As shown in fig. 4, the first steel plate 21 for constituting the mounting unit and the second steel plate 22 for constituting the mounting unit are butted against each other, and the restraining plate is welded perpendicularly to the first steel plate 21 for constituting the mounting unit and the second steel plate 22 for constituting the mounting unit. In a more preferred embodiment, gussets 7 are welded to the corners of the cavity of each mounting unit of the base of the test platform, and the gussets 27 are diagonally arranged so that there are 2 gussets 27 at each cross node location. As shown in fig. 14, is a gusset arrangement schematic of the cavity corners of the fourth mounting unit and the fifth mounting unit.
in a preferred embodiment, the specific process of the step 3 is that each welding seam of the installation unit is subjected to heating treatment, the preheated heating areas are arranged on two sides of the welding groove, the width of each preheated heating area is more than 1.5 times of the thickness of the welding position of the weldment, and the minimum width is not less than 100 mm.
in the preferred embodiment, the specific process of the step 4 is that the mounting sequence of the test platform base is to firstly assemble the middle cross stiffening girder part by tailor welding, namely the second mounting units are respectively mounted at the two sides of the fourth mounting unit; the fifth installation unit is installed at the upper part of the cross stiffening girder, and finally four corner column parts, namely the first installation unit and the third installation unit, are installed, and finally the sixth installation unit is installed; the whole welding sequence of the test platform base follows a primary welding seam and a secondary welding seam; diffusion welding from inside to outside; and the welding sequence of integral symmetrical synchronous welding and overlength welding line subsection synchronous welding. In addition, in order to ensure the forming quality of welding seams, reduce the repair of the welding seams and the like, each welding seam adopts a welding seam method of backing a solid welding wire and covering the surface of a flux-cored welding wire, and the welding quality control is ensured to the maximum extent.
In a more preferable embodiment, the specific process of the step 4 further comprises controlling the temperature of the base material of the welding area in the continuous welding process to control the interlayer temperature between 120 ℃ and 150 ℃; when the welding is interrupted, the re-preheating temperature is higher than the initial preheating temperature when the welding is carried out again; and monitoring by using an infrared thermometer in the welding process, and when the welding temperature of the welding seam is lower than the lowest value of the required range, heating to the specified requirement and then welding. The weld temperature control is shown in figure 13.
The longest welding seam 17.1m (the welding seam 24 in the first direction) is welded on the butt joint surface of the fourth installation unit and the fifth installation unit, and the whole welding sequence is as follows: welding a major axial main rib plate and then welding a minor axial rib plate; the welding is expanded from the middle part to the periphery. The welding of the fourth and fifth mounting units is divided into a lower part of the sliding plate and an outer part of the sliding plate. The fifth installation unit is provided with 5 longitudinal main rib plates (in the first direction) and 8 transverse rib plates (in the second direction) at the lower part of the sliding flat plate with strict precision requirements. When the fifth installation unit and the fourth installation unit are welded, the longitudinal central main rib plate 1 is symmetrically welded outwards from the middle, as shown in fig. 5. The 2 nd and 3 rd welding lines are divided into a left part and a right part by a symmetrical center, and are welded synchronously according to the upper left and lower right symmetry and then according to the upper left and lower right symmetry during welding, as shown in figure 6. After the 2 nd and 3 rd welding seams are finished by longitudinal welding, the transverse rib plates (forming the second-direction welding seams 25) are welded, and the middle transverse rib plates are symmetrically welded from the center to the outer side by taking the symmetrical center line as the center, as shown in figure 7. And after the middle transverse welding seam is welded, the outer transverse rib plates are continuously and symmetrically welded outwards by taking the symmetrical center line as the center. And finally, welding the outermost longitudinal main welding seams 4 and 5 by adopting a middle-outward symmetrical welding method, which is shown in a figure 8. The two parts of the sliding flat plates of the blocks 4 and 5 are symmetrically welded at the same time, and the welding sequence follows the overall welding sequence of firstly longitudinal main welding seams and then transverse welding seams and symmetrically welding from the middle part to the outer part, which is shown in figure 9.
The second mounting units are arranged on two sides of the fourth and fifth mounting units. The length of the welding line reaches 5.5m, the welding is expanded from the middle to two sides, each welding line is divided into two sections, and the welding is carried out from bottom to top at the same time, as shown in figure 10. The length of a welding seam of the first mounting unit, the third mounting unit, the fourth mounting unit and the fifth mounting unit is 4.3m, the welding seam is a T-shaped butt joint, and the welding is also from the middle to two sides. The welding plate has two types of vertical rib plates and inclined rib plates, when the vertical rib plates are welded, 1 vertical rib welding line is integrally welded for half, the other vertical rib plate is welded for the first time, and the first vertical rib plate is returned to finish the rest welding. The diagonal rib plate 26 is welded after the stud plate is welded. See fig. 11. The welding seams of the blocks 1 and 3 and the block 2 are 4.05m long and are divided into a transverse welding seam and a longitudinal welding seam, the longitudinal welding seam is firstly welded and then the transverse welding seam is welded, and the welding is shown in figure 12.
And 5, carrying out post-heating treatment on the welding seam of the mounting unit after welding.
In a preferred embodiment, the specific process of the step 5 is that after welding is finished, electric heating treatment is carried out on the welding seams to eliminate welding residual stress, the whole heat treatment sequence is consistent with the welding sequence of the base blocks, and the electric heating treatment is carried out on the welding seams one by one. In a preferred embodiment, the heat treatment equipment for performing electric heating treatment is electric heating equipment, a heating plate and heat preservation cotton; a thermocouple sensor is welded at a heating position to be provided with temperature control points, and each three heating plates are provided with one temperature control point.
The welding method is used for carrying out intensive welding manufacture on the base of the giant complex multi-cavity test platform with the length of 17.1m, the width of 13.6m and the height of 6.93 m. After the manufacture is finished, the precision of the base meets the following requirements that the precision of four-corner upright post installation surfaces (the plane dimension: 3.5 multiplied by 3.5 m) after the welding installation of the base is finished: the planeness is less than or equal to 0.1mm, the levelness is less than or equal to 0.1mm/m, and the maximum horizontal height difference of the four mounting surfaces is less than or equal to 0.2 m; middle sliding plate precision: the flatness is less than or equal to 0.03mm in any phi 1250mm range, and the levelness is 0.2 mm/m. The large-scale steel structure base is divided into 9 blocks, and each block has huge size and complex structure. The method of the invention ensures the welding contraction consistency of the welding seam of the large-scale steel structure by processing each welding part before welding, determining the welding sequence and the welding process parameters and adopting the matched mechanical connection in the welding process, and controls the welding deformation to the minimum to meet the welding precision requirement of the base.
The technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.
Claims (7)
1. A large complex multi-cavity test platform base intensive welding method is characterized in that a test platform base is formed by welding installation units, and the installation units are prefabricated in a factory by steel plates; the welding method comprises the following steps:
step 1, preprocessing a welding groove of an installation unit;
step 2, pre-assembling the installation units into a whole, and setting mechanical connection among the installation units;
step 3, performing preheating treatment on the welding seam position of the mounting unit before welding;
step 4, welding the mounting units according to the established welding process and welding sequence;
the specific process of the step 4 is as follows: the mounting sequence of the test platform base is that the middle cross stiffening girder part is assembled by tailor welding, namely the second mounting units are respectively mounted at the two sides of the fourth mounting unit; the fifth installation unit is installed at the upper part of the cross stiffening girder, and finally four corner column parts, namely the first installation unit and the third installation unit, are installed, and finally the sixth installation unit is installed; the whole welding sequence of the test platform base follows a primary welding seam and a secondary welding seam; diffusion welding from inside to outside; the welding sequence of integral symmetrical synchronous welding and overlength welding seam subsection synchronous welding;
the specific process of step 4 further comprises: controlling the temperature of the base material of the welding area in the continuous welding process to control the interlayer temperature between 120 and 150 ℃; when the welding is interrupted, the re-preheating temperature is higher than the initial preheating temperature when the welding is carried out again; monitoring by using an infrared thermometer in the welding process, and when the welding temperature of a welding seam is lower than the lowest value of a required range, heating to the specified requirement and then welding;
step 5, carrying out post-heating treatment on the welding seam of the installation unit after welding;
the test platform base comprises two first mounting units, two second mounting units, two third mounting units, a fourth mounting unit, a fifth mounting unit and a sixth mounting unit; the fourth mounting unit and the fifth mounting unit are vertically butted to form a first combination, and the second mounting units are respectively mounted on two sides of the first combination to form a cross-shaped second combination; the first mounting unit is mounted at one pair of diagonal positions of the second combination, and the third mounting unit is mounted at the other pair of diagonal positions of the second combination; the sixth mounting unit is mounted on the upper part of the fifth mounting unit and is positioned between the first mounting unit and the third mounting unit; the first mounting unit and the third mounting unit are respectively mounted on the vibration isolation support of the concrete buttress; the horizontal height of the lower edge of the second assembly is higher than the horizontal height of the lower edges of the first installation unit and the third installation unit, so that the bottom of the second assembly forms a cross stiffening frame.
2. The method of claim 1, wherein the step 1 comprises the following steps: and processing the same type of welding seams of the installation unit by a beveling machine tool before the installation unit leaves a factory, so that the specifications and the sizes of the same type of welding seams are kept consistent.
3. The method of claim 1, wherein the step 2 comprises the following steps: 9 mounting units of the test platform base are pre-assembled into a whole, and mechanical connection is arranged at the upper part, the bottom and the inside of the assembled base to prevent deformation in the welding process; arranging constraint plates at two sides of the welding line in each installation unit for fixation; and a restraint plate is respectively arranged at the central part of four sides of each cavity of the welding line between the fourth mounting unit and the fifth mounting unit, and restraint plates are arranged at intervals of 1m on the vertical welding lines between other blocks.
4. The method of densely welding the large scale complex multi-cavity test platform base according to claim 3, wherein gusset plates are welded to the cavity corners of each mounting unit of the test platform base, and the gusset plates are arranged diagonally, so that there are 2 gusset plates at each cross joint position.
5. The method of claim 1, wherein the step 3 comprises the following steps: and (3) heating each welding line of the installation unit, wherein the preheated heating areas are arranged at two sides of the welding groove, the width of each preheating area is more than 1.5 times of the thickness of the welding position of the weldment, and the minimum width is not less than 100 mm.
6. The method of claim 1, wherein the detailed process of step 5 is as follows: and after welding, performing electric heating treatment on the welding seams to eliminate welding residual stress, wherein the whole heat treatment sequence is consistent with the welding sequence of the base blocks, and performing electric heating treatment on the welding seams one by one.
7. The method of claim 6, wherein the thermal processing equipment for performing the electrical heating process comprises electrical heating equipment, a heating plate and heat-insulating cotton; a thermocouple sensor is welded at a heating position to be provided with temperature control points, and each three heating plates are provided with one temperature control point.
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|---|---|---|---|---|
| CN102091877A (en) * | 2010-12-21 | 2011-06-15 | 中国建筑第八工程局有限公司 | Construction method for butt welding irregular space box-type steel members |
| CN103624410A (en) * | 2013-10-22 | 2014-03-12 | 中建钢构有限公司北京分公司 | Method for welding large special-shaped multicavity steel structure |
| CN204843369U (en) * | 2015-07-21 | 2015-12-09 | 中国十七冶集团有限公司 | Steel case roof beam steel structure welding anti -deformation platform device |
| CN105537811A (en) * | 2016-01-22 | 2016-05-04 | 中建钢构有限公司 | Special-shape multicavity giant column welding deformation control method |
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- 2017-05-05 CN CN201710313349.4A patent/CN107378288B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091877A (en) * | 2010-12-21 | 2011-06-15 | 中国建筑第八工程局有限公司 | Construction method for butt welding irregular space box-type steel members |
| CN103624410A (en) * | 2013-10-22 | 2014-03-12 | 中建钢构有限公司北京分公司 | Method for welding large special-shaped multicavity steel structure |
| CN204843369U (en) * | 2015-07-21 | 2015-12-09 | 中国十七冶集团有限公司 | Steel case roof beam steel structure welding anti -deformation platform device |
| CN105537811A (en) * | 2016-01-22 | 2016-05-04 | 中建钢构有限公司 | Special-shape multicavity giant column welding deformation control method |
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