CN115041855A - Welding structure and welding process for ultrahigh-strength steel and high-strength steel - Google Patents
Welding structure and welding process for ultrahigh-strength steel and high-strength steel Download PDFInfo
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- CN115041855A CN115041855A CN202210763004.XA CN202210763004A CN115041855A CN 115041855 A CN115041855 A CN 115041855A CN 202210763004 A CN202210763004 A CN 202210763004A CN 115041855 A CN115041855 A CN 115041855A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 149
- 239000010959 steel Substances 0.000 title claims abstract description 149
- 238000003466 welding Methods 0.000 title claims abstract description 134
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000007704 transition Effects 0.000 claims abstract description 35
- 239000011229 interlayer Substances 0.000 claims description 10
- 238000010583 slow cooling Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 2
- 230000001066 destructive effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 230000000704 physical effect Effects 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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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- 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
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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Abstract
The application relates to the technical field of welding of ultrahigh-strength steel, in particular to a welding structure and a welding process of ultrahigh-strength steel and high-strength steel; the welding structure of the ultrahigh-strength steel and the high-strength steel comprises an ultrahigh-strength steel workpiece, a high-strength steel workpiece and a transition high-strength steel workpiece; the transitional high-strength steel workpiece is arranged between the ultrahigh-strength workpiece and the high-strength steel workpiece, and the ultrahigh-strength steel workpiece and the high-strength steel workpiece are connected by welding through the transitional high-strength steel workpiece; the welding connection performance of the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece is higher than that of the high-strength steel workpiece and the ultrahigh-strength steel workpiece. According to the method, the transitional high-strength steel workpiece with relatively good welding performance is introduced into the ultrahigh-strength steel workpiece and the high-strength steel workpiece, the metallographic structure of the ultrahigh-strength steel and the high-strength steel is reduced, the difference of the physical properties of metals is large, the compatibility is poor, the risk of hardening structure and welding crack is easy to occur during welding, and the problem of cracking of the welding seam of the welding structure of the ultrahigh-strength steel and the high-strength steel is solved.
Description
Technical Field
The application relates to the technical field of welding of ultrahigh-strength steel, in particular to a welding structure and a welding process of ultrahigh-strength steel and high-strength steel.
Background
The ultrahigh-strength steel and the high-strength steel are ultrahigh-strength metal armor materials, the strength of the ultrahigh-strength steel is usually more than 1700MPa, and the ultrahigh-strength steel is mostly used as a hanging mode; the strength of ultrahigh-strength steel applied to the existing market is usually 1200-1500MPa, the welding technology of the ultrahigh-strength steel and high-strength steel is a key factor influencing the application of the ultrahigh-strength steel, the higher the strength of the ultrahigh-strength steel is, the greater the welding difficulty is, strong welding restraint force can be generated in the welding process of the ultrahigh-strength steel, the problem of welding cracking deformation is easily caused, and the quality of a welding seam is difficult to control. How to realize the welding of the high-quality 1700MPa ultrahigh-strength steel becomes the focus of research of those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a welding structure and a welding process of ultrahigh-strength steel and high-strength steel, so as to realize high-quality welding of the ultrahigh-strength steel and the high-strength steel.
The technical scheme provided by the invention is as follows:
a welding structure of ultra-high strength steel and high strength steel, comprising: ultra-high strength steel workpieces, high strength steel workpieces and transitional high strength steel workpieces;
the transitional high-strength steel workpiece is arranged between the ultrahigh-strength workpiece and the high-strength steel workpiece, and the ultrahigh-strength steel workpiece and the high-strength steel workpiece are connected by welding through the transitional high-strength steel workpiece;
the welding connection performance of the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece is higher than that of the high-strength steel workpiece and the ultrahigh-strength steel workpiece.
Further, the steel plate thickness of the ultrahigh-strength steel workpiece and the high-strength steel workpiece is the same.
Furthermore, the gap between the ultrahigh-strength steel workpiece and the high-strength steel workpiece is 2-3 times of the thickness of the ultrahigh-strength steel workpiece.
Furthermore, the ultrahigh-strength steel workpiece is of a flat plate structure, the transition high-strength steel workpiece is of a flat plate structure, and the high-strength steel workpiece is of a tubular structure.
The application also provides a welding process of the ultrahigh-strength bulletproof steel and the high-strength steel, which comprises the welding structure and comprises the following steps:
preprocessing a region to be welded of a welding workpiece;
positioning, overlapping and welding the workpieces to form a large gap structure between the high-strength steel workpiece and the ultrahigh-strength steel workpiece, wherein the thickness of the large gap is 2-3 times that of the high-strength steel workpiece or the ultrahigh-strength steel workpiece;
welding seams among the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece are welded by adopting 70-80 kg welding wires, and the interlayer temperature and the air speed of a welding area are well controlled in the welding process.
Further, the pretreatment of the to-be-welded area of the welded workpiece specifically includes: preheating the area to be welded of the welded workpiece, removing moisture, rust and oil stains on the area to be welded, and polishing and repairing air holes and cracks of the welding line.
Furthermore, in the welding process of the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece, a first fillet weld formed by the high-strength steel workpiece and the transition high-strength steel workpiece is welded; secondly, welding a second fillet weld formed by the ultrahigh-strength workpiece and the transitional high-strength steel workpiece; welding a backing weld between a first fillet weld and a second fillet weld on the transitional high-strength steel workpiece, wherein the backing weld is used for connecting the first fillet weld and the second fillet weld; and finally, welding a cover surface welding line between the first fillet welding line and the second fillet welding line.
Further, the interlayer temperature is between 100 and 200 ℃, and the wind speed of a welding area is less than 1 m/s.
And further, the method also comprises the steps of heat preservation after welding and weld joint detection, and one or more of MT, PT and RT nondestructive flaw detection are carried out on the welded weld joint.
Further, before the welding seam detection step, slow cooling treatment is carried out on the welded workpiece after welding, so that the cooling time of the welded workpiece is prolonged.
Has the advantages that:
compared with the prior art, the ultrahigh-strength steel and high-strength steel welding structure has the advantages that the transitional high-strength steel workpiece with relatively good welding performance is introduced into the ultrahigh-strength steel workpiece and the high-strength steel workpiece, the metallographic structure and the metal physical property of the ultrahigh-strength steel and the high-strength steel are greatly different, the compatibility is poor, the risk of hardening structure and welding cracks is easy to occur during welding, and the problem of cracking of the welding seam of the ultrahigh-strength steel and high-strength steel welding structure is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a welding structure of ultrahigh-strength steel and high-strength steel according to the present invention;
FIG. 2 is a schematic view of a fillet weld butt structure of the high-strength steel and the transition high-strength steel in FIG. 1;
FIG. 3 is a schematic view of a flat butt structure of high-strength steel and transition high-strength steel;
FIG. 4 is a schematic view of a flat butt weld structure of the high-strength steel and the transition high-strength steel in FIG. 3;
FIG. 5 is a flow chart of a welding process of ultra-high strength steel and high strength steel according to the present invention;
reference numerals: 1. ultrahigh-strength steel, 2, transition high-strength steel, 3, high-strength steel, d, big clearance, 4, first fillet weld, 5, second fillet weld, 6, backing weld, 7, capping weld.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
As shown in fig. 1, an embodiment of the present invention provides an ultra-high strength steel and high strength steel welded structure, including: the device comprises an ultrahigh-strength steel workpiece 1, a high-strength steel workpiece 3 and a transition high-strength steel workpiece 2; the transitional high-strength steel workpiece is arranged between the ultrahigh-strength workpiece and the high-strength steel workpiece, and the ultrahigh-strength steel workpiece and the high-strength steel workpiece are connected by welding through the transitional high-strength steel workpiece; the welding connection performance of the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece is higher than that of the high-strength steel workpiece and the ultrahigh-strength steel workpiece.
According to the welding structure of the ultrahigh-strength steel and the high-strength steel, the transitional high-strength steel workpiece with relatively good welding performance is introduced into the ultrahigh-strength steel workpiece and the high-strength steel workpiece, the risks that the metallographic structure, the metal physical property difference and the compatibility are large, the ultrahigh-strength steel and the high-strength steel are easy to cause hardening structure and welding cracks during welding are reduced, and the problem that the welding seam of the welding structure of the ultrahigh-strength steel and the high-strength steel cracks is solved.
As a preferred embodiment, as shown in fig. 1 to 2, the ultra-high strength steel workpiece of the present application is a flat plate structure, which is an ultra-high strength steel plate; the transition high-strength steel workpiece is of a flat plate structure and is a transition high-strength steel plate, and the high-strength steel workpiece is of a tubular structure and is a high-strength steel pipe.
The steel plate thicknesses of the ultrahigh-strength steel workpiece, the transition high-strength steel workpiece and the high-strength steel workpiece are the same. Preferably, the thicknesses of the ultrahigh-strength steel workpiece, the high-strength steel workpiece and the transitional high-strength steel workpiece are all 3-5 mm. The clearance between the ultrahigh-strength steel workpiece and the high-strength steel workpiece is 2-3 times of the thickness of the ultrahigh-strength steel workpiece. In the application, the optimal gap is 8-12mm, and the large gap structure of 8-12mm effectively ensures that the fillet welds of the ultrahigh-strength steel workpiece and the transition high-strength steel workpiece are independent of the fillet welds of the high-strength steel workpiece and the transition high-strength steel workpiece.
Referring to fig. 5, the application also provides a welding process of the ultrahigh-strength bulletproof steel and the high-strength steel, which comprises the welding structure and comprises the following steps:
preprocessing a region to be welded of a welding workpiece;
positioning, overlapping and welding the workpieces to form a large gap structure between the high-strength steel workpiece and the ultrahigh-strength steel workpiece, wherein the thickness of the large gap is 2-3 times that of the high-strength steel workpiece or the ultrahigh-strength steel workpiece; the 2-3 times large gap d ensures that a first fillet weld formed by welding the high-strength steel workpiece and the transition high-strength steel workpiece is independent of a second fillet weld formed by the ultrahigh-strength steel workpiece and the transition high-strength steel workpiece, so that the welding quality of each fillet weld is not easily influenced.
Welding seams among the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece are welded by adopting 70-80 kg welding wires, and the interlayer temperature and the wind speed of a welding area are well controlled in the welding process. The interlayer temperature is 100-200 ℃, and the wind speed of a welding area is less than 1 m/s. The limited range of wind speed and interlayer temperature welding is beneficial to improving the welding quality of the welding seam.
Preferably, the pretreatment of the to-be-welded area of the welded workpiece specifically includes: preheating the area to be welded of the welded workpiece, removing moisture, rust and oil stains on the area to be welded, and polishing and repairing air holes and cracks of the welding line.
In the welding process of the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece, firstly welding a first fillet weld 4 formed by the high-strength steel workpiece and the transition high-strength steel workpiece; secondly, welding a second fillet weld 5 formed by the ultrahigh-strength workpiece and the transition high-strength steel workpiece; welding a backing weld 6 between a first fillet weld and a second fillet weld on the transitional high-strength steel workpiece, wherein the backing weld is used for connecting the first fillet weld and the second fillet weld; and finally, welding a cap weld 7 between the first fillet weld and the second fillet weld.
FIGS. 1 and 2 are fillet weld configurations of the welded construction of the present application; fig. 3 and 4 are flat butt weld configurations of the welded configuration of the present application. The fillet weld structure and the flat butt weld structure are welded in two structural forms, namely, a first fillet weld formed by a high-strength steel pipe and a transition high-strength steel plate is welded firstly, a second fillet weld formed by an ultrahigh-strength steel plate and a transition high-strength steel plate is welded secondly, a third backing weld of the first fillet weld and the second fillet weld on the transition high-strength steel plate is welded secondly, and a fourth cover face weld is welded finally. Among the above-mentioned welding mode, weld first way fillet weld, second way fillet weld, third way backing weld and fourth way lid face welding seam in proper order, can ensure effectively that the leg of every welding seam is little, and heat input is little, and to constraining big welded joint, can reduce shrinkage stress simultaneously, prevent that the crackle from producing. In addition, the transition high-strength steel plate workpiece introduced into the welding structure, the ultrahigh-strength steel workpiece and the high-strength steel workpiece respectively have good welding performance with the transition high-strength steel plate workpiece, and the problem of welding cracks and hardening structures in a heat affected zone caused by the defects of metallographic structures, large difference of metal physical properties, poor compatibility and the like of the original ultrahigh-strength steel and high-strength steel is effectively solved.
It should be noted that, during the welding process of the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece, the temperature can be monitored and measured by an infrared thermometer, and when the welding environment temperature is lower than 5 ℃, the welding workpiece is preheated to the required interlayer temperature range for welding; the preheating mode includes but is not limited to flame heating, industrial frequency induction heating, infrared heating, electric furnace, microwave oven heating and the like. When the temperature of the welding seam base material position is higher than 20% of the interlayer temperature, the welding seam base material position needs to be cooled to the required interlayer temperature and then welding is carried out. And the ceramic fiber heat preservation quilt and other related products can be used for carrying out the post-welding heat preservation on the welding workpiece in order to ensure the post-welding slow cooling.
As a preferred embodiment, the method further comprises a weld joint detection step, wherein one or more of MT, PT and RT nondestructive flaw detection is carried out on the welded weld joint. And before the welding seam detection step, slow cooling treatment is carried out on the welded workpiece, the welded workpiece is wrapped by ceramic fiber and the like, or the welded workpiece is placed into a heat preservation box to be cooled in a closed manner, so that the cooling rate of the welded workpiece is delayed. Through the actual welding evidence of welding step of this application welding process, the ultrahigh strength steel after the welding detects the welding seam with high strength steel construction MT or PT and does not have crackle and welding seam gas pocket, and RT detects and reaches the one-level, satisfies the welding operation requirement of ultrahigh strength steel and high strength steel.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A welding structure of ultrahigh-strength steel and high-strength steel is characterized by comprising: ultra-high strength steel workpieces, high strength steel workpieces and transitional high strength steel workpieces;
the transitional high-strength steel workpiece is arranged between the ultrahigh-strength workpiece and the high-strength steel workpiece, and the ultrahigh-strength steel workpiece and the high-strength steel workpiece are connected by welding through the transitional high-strength steel workpiece;
the welding connection performance of the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece is higher than that of the high-strength steel workpiece and the ultrahigh-strength steel workpiece.
2. The ultra high strength steel to high strength steel welded structure of claim 1, wherein the steel plate thickness of both the ultra high strength steel work piece and the high strength steel work piece is the same.
3. The ultra high strength steel to high strength steel welded structure of claim 1, wherein the gap between the ultra high strength steel workpiece and the high strength steel workpiece is 2-3 times the thickness of the ultra high strength steel workpiece.
4. The ultra-high strength steel and high strength steel welded structure according to any one of claims 1 to 3, wherein the ultra-high strength steel workpiece is of a flat plate structure, the transition high strength steel workpiece is of a flat plate structure, and the high strength steel workpiece is of a tubular structure.
5. A process for welding ultra-high strength bulletproof steel and high strength steel, comprising the welded structure of any one of claims 1 to 4, characterized by comprising the steps of:
preprocessing a region to be welded of a welding workpiece;
positioning, overlapping and welding the workpieces to form a large gap structure between the high-strength steel workpiece and the ultrahigh-strength steel workpiece, wherein the thickness of the large gap is 2-3 times that of the high-strength steel workpiece or the ultrahigh-strength steel workpiece;
welding seams among the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece are welded by adopting 70-80 kg welding wires, and the interlayer temperature range and the wind speed of a welding area are well controlled.
6. The welding process of the ultrahigh-strength steel and the high-strength steel according to claim 5, wherein the pretreatment of the areas to be welded of the welded workpiece specifically comprises: preheating the area to be welded of the welded workpiece, removing moisture, rust and oil stains on the area to be welded, and polishing and repairing air holes and cracks of the welding line.
7. The welding process of the ultrahigh-strength steel and the high-strength steel according to claim 6, wherein in the welding process of the high-strength steel workpiece, the transition high-strength steel workpiece and the ultrahigh-strength steel workpiece, a first fillet weld formed by the high-strength steel workpiece and the transition high-strength steel workpiece is welded firstly; secondly, welding a second fillet weld formed by the ultrahigh-strength workpiece and the transitional high-strength steel workpiece; welding a backing weld between a first fillet weld and a second fillet weld on the transitional high-strength steel workpiece, wherein the backing weld is used for connecting the first fillet weld and the second fillet weld; and finally, welding a cover surface welding line between the first fillet welding line and the second fillet welding line.
8. The welding process of ultrahigh-strength steel and high-strength steel according to claim 7, wherein the interlayer temperature range is 100-200 ℃, and the wind speed in the welding area is less than 1 m/s.
9. The process of welding ultra-high strength steel and ultra-high strength steel according to claim 8, further comprising a weld inspection step of performing one or more non-destructive inspection tests of MT, PT and RT on the welded weld.
10. The process of welding ultra-high strength steel and high strength steel according to claim 9, further comprising a slow cooling treatment of the welded workpiece before the step of detecting the weld.
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| CN111702362A (en) * | 2020-05-25 | 2020-09-25 | 中国建筑第八工程局有限公司 | Welding method and welding structure of steel pipe column internal stiffening plate and bottom plate support |
| CN113118655A (en) * | 2021-03-17 | 2021-07-16 | 南京东斯达机电科技有限公司 | Welding method and device for single-side V-shaped groove weldment with uneven groove gap |
| CN114636024A (en) * | 2022-04-29 | 2022-06-17 | 杨硕 | High-strength steel cylinder steel-concrete composite pipe |
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