Construction method for box column partition adopting single-side electroslag welding

Abstract

The present application relates to steel structure welding process technical field, specifically disclose a kind of construction method of box column partition plate adopts single-sided electroslag welding welding, 1) blanking: cutting partition plate and baffle;2) groove processing: groove a1 of one kind is CO2 gas shielded welding, another is groove a2 of electroslag welding in partition plate edge processing;3) assembly: first partition plate and baffle are assembled together;4) partition plate welding: CO2 gas shielded welding is used to connect weld of partition plate and lower wing plate, left web plate, right web plate, after welding, assembly upper wing plate;5) bottoming and filling welding: CO2 gas shielded welding is used to bottoming filling welding of wing plate and web plate connecting weld;6) electroslag welding: electroslag welding weld is generated at the junction of partition plate and upper wing plate;7) cap welding: remove arc and arc high part, repair welding electroslag welding hole both sides reserved part;The present application can guarantee the quality inside weld, and also reduce construction cost, improve work efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel structure welding technology, specifically to a construction method for box-type column partitions using single-sided electroslag welding. Background Technology

[0002] Box columns are a common structural form in industrial and civil buildings. The design of box columns requires diaphragms in the corbel section. Traditional methods involve two CO2 gas shielded welds and two electroslag welds for these diaphragms. The use of electroslag welds for symmetrical welding aims to prevent excessive post-weld deformation. However, this method suffers from high welding costs, poor weld quality, and a long construction period. After numerous experiments and careful research, the traditional double-sided electroslag welding process has been changed to a single-sided electroslag welding process. Therefore, a construction method for box column diaphragms using single-sided electroslag welding is needed, with the other three sides welded using CO2 gas shielded welding. This effectively solves the problems of long welding cycles, high costs, and poor quality associated with traditional diaphragm welding methods. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a construction method for box-type column partitions using single-sided electroslag welding.

[0004] The technical solution adopted by this invention to solve its technical problem is: a construction method for box-type column diaphragms using single-sided electroslag welding, comprising the following steps:

[0005] 1) Cutting: Cut the steel plate into partitions and baffles as required by the drawings;

[0006] 2) Beveling: After the material is cut, beveling is performed on the edge of the partition. There are two types of beveling sizes: one is beveling a1 for CO2 gas shielded welding, and the other is beveling a2 for electroslag welding.

[0007] 3) Assembly: After bevel a1 and bevel a2 are processed, first assemble the partition and baffle together, then assemble and spot weld the partition, left web plate, right web plate and lower flange plate, and assemble the left web plate and right web plate into a U-shape.

[0008] 4) Partition welding: After assembling into a U-shape, CO2 gas shielded welding is used to weld the connection seams between the partition and the lower wing plate, left web plate, and right web plate. After welding is completed, the upper wing plate is assembled.

[0009] 5) Root pass and fill pass welding: After the upper flange is assembled, CO2 gas shielded welding is used to perform root pass and fill pass welding on the weld connecting the flange and the web.

[0010] 6) Electroslag welding: Electroslag welds are produced at the connection between the partition and the upper flange;

[0011] 7) Cover welding: After the electroslag welding is completed, remove the high part of the arc starting and ending, and weld the reserved part on both sides of the electroslag welding hole. Use portal submerged arc welding to weld the connection between the flange and the web. After welding, measure the deformation and inspect the internal quality of the weld. After passing the inspection, it is handed over to the next process.

[0012] Specifically, in step 1), the length of the partition in the web direction is 543mm, the length of the partition in the wing direction is 568mm, and the thickness of the partition is 16mm.

[0013] Specifically, in step 1), there are two baffles, which are located above and below the connecting lower wing of the partition, and the length, width and height of the baffles are 568mm×50mm×25mm.

[0014] Specifically, in step 2), the bevel a1 is the connecting edge between the partition and the lower flange and the two side webs. The three sides of the partition are machined with 45° bevels a1 without leaving blunt edges. The bevel a2 is the I-shaped bevel a2 that connects the partition and the upper flange. The width and height of the bevel a2 are 25mm × 16mm.

[0015] Specifically, during the assembly in step 3), the partition positioning line is drawn based on the lower wing plate, and the partition is spot welded.

[0016] Specifically, in step 4), the welding process involves first welding the connection between the partition plate and the left and right web plates, and then welding the connection between the partition plate and the lower flange.

[0017] Specifically, in step 5), there are a total of 4 welds connecting the wing plate and the web plate. A 20mm gap is left on both sides of the electroslag weld to prevent welding slag from flowing into the electroslag weld and making electroslag welding impossible.

[0018] Specifically, the main difficulty in electroslag welding in step 6) is that deformation control is more difficult when electroslag welding is performed on one side, which can easily lead to lateral bending. The measures taken are as follows: First, while ensuring internal fusion, smaller welding parameters are used as much as possible to reduce heat input and welding deformation. Second, a skip welding method is used. Generally, several layers of brackets are distributed on a steel column section, and each layer of brackets has a different number of electroslag welding holes. It is not possible to weld all the electroslag welding holes in one layer of brackets before welding other layers, as this would cause heat concentration and large deformation. Skip welding means welding one hole at each layer of brackets and cyclically welding until all are welded. Third, the welding interval time is increased.

[0019] The present invention has the following beneficial effects:

[0020] The box-shaped column partition designed in this invention adopts a construction method of single-sided electroslag welding. By using the single-sided electroslag welding process, the internal quality of the weld can be guaranteed, and construction costs, construction time, and work efficiency can be reduced. Attached Figure Description

[0021] Figure 1 This is the front view of the partition.

[0022] Figure 2 This is a side view of the partition.

[0023] Figure 3 This is the front view of the baffle.

[0024] Figure 4 This is a side view of the baffle.

[0025] Figure 5 This is a schematic diagram of the bevel of the partition.

[0026] Figure 6 yes Figure 5 Sectional view along the AA direction.

[0027] Figure 7 yes Figure 5 Sectional view along the BB direction.

[0028] Figure 8 This is a schematic diagram of the CO2 gas shielded welding structure of the partition.

[0029] Figure 9 This is a schematic diagram of the structure for the root filler welding of the weld seam connecting the flange and the web.

[0030] Figure 10 yes Figure 9 A cross-sectional view along the CC direction.

[0031] Figure 11 This is a schematic diagram of the weld cover of the connection between the flange and the web.

[0032] In the figure: 1-partition plate; 2-baffle plate; 3-bevel a1; 4-bevel a2; 5-left web plate; 6-right web plate; 7-lower flange plate; 8-connecting weld; 9-upper flange plate; 10-weld connecting flange plate and web plate; 11-electroslag weld. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] like Figure 1-11 As shown, the construction method for box-type column diaphragms using single-sided electroslag welding includes the following steps:

[0035] 1) Cutting: Cut the steel plate into partition 1 and baffle 2 as required by the drawing. The web length of partition 1 is 543mm, the wing length of partition 1 is 568mm, and the length, width and height of baffle 2 are 568mm×50mm×25mm. There are 2 baffles.

[0036] 2) Beveling: After blanking, beveling is performed on the edge of partition 1. There are two types of beveling sizes: one is a CO2 gas shielded welding beveling, where the partition 1 is connected to the lower flange 7 and the two side webs (left web 5 and right web 6), and the three sides of partition 1 are machined with a 45° beveling a13 without leaving a blunt edge. The other is an electroslag welding beveling, where the partition 1 is connected to the upper flange 9 and machined into an I-shaped beveling a24, with the dimensions of beveling a24 being 25mm × 16mm (the thickness of partition 1).

[0037] 3) Assembly: After bevels a13 and a24 are machined, first assemble partition 1 and baffle 2 together. Then, assemble and spot weld partition 1, left web plate 5, right web plate 6, and lower flange 7. During assembly, draw the positioning line of partition 1 with the lower flange 7 as the reference, spot weld partition 1, assemble the left web plate 5 and right web plate 6 on both sides, and assemble them into a U-shape.

[0038] 4) Partition welding: After assembling into a U-shape, the partition 1 is welded to the lower flange 7, left web 5 and right web 6 using CO2 gas shielded welding. During welding, the connection weld 8 between the partition 1 and the left web 5 and right web 6 is welded first, and then the connection weld 8 between the partition 1 and the lower flange 7 is welded. After welding is completed, the upper flange 9 is assembled.

[0039] 5) Root pass and fill pass welding: After the upper flange 9 is assembled, CO2 gas shielded welding is used to perform root pass and fill pass welding on the flange and web connection weld 10 (4 passes in total). 20mm is left unwelded on both sides of the electroslag weld 11 to prevent welding slag from flowing into the electroslag weld 11 and making electroslag welding impossible.

[0040] 6) Electroslag Welding: The main challenge is the increased difficulty in deformation control when electroslag welding is performed on one side, which easily leads to lateral bending. The measures taken are: First, using smaller welding parameters as much as possible while ensuring internal fusion reduces heat input and welding deformation. Second, employing a skip welding method. Generally, several layers of brackets are distributed on a steel column section, with a varying number of electroslag welding holes at each layer. Welding all the holes at one layer of brackets before welding other layers would cause heat concentration and greater deformation. Skip welding involves welding one hole at each layer of brackets, cycling through the layers until all are welded, thus reducing heat concentration. Third, appropriately increasing the welding interval can also reduce excessive heat input.

[0041] 7) Cover welding: After the electroslag weld 11 is completed, remove the high part of the arc starting and ending, and weld the reserved part on both sides of the electroslag weld hole. Use portal submerged arc welding to weld the flange and web plate connection weld 10 (4 passes in total). After welding, measure the deformation, inspect the internal quality of the weld, and hand it over to the next process after it is qualified.

[0042] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0043] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A construction method for welding a box column diaphragm using single-sided electroslag welding, characterized by, It comprises the following steps: 1) blanking: according to the requirements, cut the steel plate into the required baffle (1) and the baffle (2) of the drawing; 2) groove processing: after the blanking is completed, the groove of the baffle (1) edge is processed, and the groove size is divided into two kinds: one is the groove a1 (3) of CO2 gas shielded welding, and the other is the groove a2 (4) of electroslag welding; 3) assembly: after the groove a1 (3) and the groove a2 (4) are processed, the baffle (1) is first assembled with the baffle (2), and then the baffle (1) is assembled with the left web plate (5), the right web plate (6) and the lower wing plate (7) by spot welding, and the left web plate (5) and the right web plate (6) are assembled into a U-shaped structure; 4) baffle welding: after the U-shaped structure is assembled, the baffle (1) is welded with the lower wing plate (7), the left web plate (5) and the right web plate (6) by CO2 gas shielded welding, and then the upper wing plate (9) is assembled; 5) backing and filling welding: after the upper wing plate (9) is assembled, the wing plate and the web plate are connected by backing and filling welding of the welding seam (10) by CO2 gas shielded welding; 6) electroslag welding: the electroslag welding seam (11) is generated at the connection between the baffle (1) and the upper wing plate (9); the difficulty of electroslag welding is that the deformation control is difficult when the electroslag welding is set on one side, and the side bending is easy to occur, and the measures taken are: first, the smaller welding specification is used as much as possible under the condition of ensuring internal fusion, the heat input is reduced, and the welding deformation is relatively reduced; second, the skip welding method is used, several layers of corbels are distributed on one steel column, there are different numbers of electroslag welding holes at each layer of corbel, and all the electroslag welding holes at one layer of corbel cannot be welded at the same time as the welding of other layers, which will cause heat concentration and large deformation, and the skip welding method is used, that is, one hole is welded at each layer of corbel, and the welding is circular until the welding is completed; third, the interval time of welding is increased; 7) surface welding: after the electroslag welding seam (11) is welded, the high part of the arc striking and arc collecting is removed, the pre-reserved parts on both sides of the electroslag welding hole are welded, the wing plate and the web plate are connected by the door type submerged arc welding of the welding seam (10), and then the deformation is measured, the internal quality of the welding seam is detected, and the qualified product is delivered to the next process.

2. The construction method of box-type column diaphragm welded by single-sided electroslag welding according to claim 1, characterized in that, The length dimension of the web plate of the baffle (1) in step 1) is 543mm, the length dimension of the wing plate of the baffle (1) is 568mm, and the thickness of the baffle (1) is 16mm.

3. The construction method of box-type column partition using single-sided electroslag welding according to claim 1, wherein The baffle (2) in step 1) is provided with two pieces, and the two baffles (2) are respectively located at the upper and lower positions of the connection lower wing plate of the baffle (1), and the length, width and height dimensions of the baffle (2) are 568mm×50mm×25mm.

4. The construction method of box-type column partition using single-sided electroslag welding according to claim 1, wherein The groove a1 (3) in step 2) is the connecting edge of the baffle (1) and the lower wing plate direction and the two side web plate directions, and the three surfaces of the baffle (1) are processed with a 45° groove a1 (3) without leaving a blunt edge; the groove a2 (4) is an I-shaped groove a2 (4) processed for the connection between the baffle (1) and the upper wing plate direction, and the width and height dimensions of the groove a2 (4) are 25mm×16mm.

5. The construction method of box-type column partition using single-sided electroslag welding according to claim 1, wherein, In step 3), the baffle (1) positioning line is drawn based on the lower wing plate (7) as the reference, and the baffle (1) is spot welded.

6. The construction method of box-type column partition using single-sided electroshock welding according to claim 1, wherein, The welding in the step 4) is to weld the connecting welds (8) between the partition plate (1) and the left web plate (5) and the right web plate (6) first, and then weld the connecting welds (8) between the partition plate (1) and the lower wing plate (7).

7. The construction method of box-type column partition using single-sided electroslag welding according to claim 1, wherein, The wing plate and web plate connecting welds (10) in the step 5) are four, and 20mm non-welding is reserved on both sides of the electroslag welding weld (11) to prevent welding slag from flowing into the electroslag welding weld (11) and unable to perform electroslag welding.

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