CN115673501A - Tower connection resistance welding method for steel belt - Google Patents
Tower connection resistance welding method for steel belt Download PDFInfo
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Abstract
The application provides a tower-connected resistance welding method for a steel strip, which is characterized in that the steel strip is welded by a narrow tower-connected resistance welding machine according to a welding process range, wherein the steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities; the tower connection width of the narrow tower connection resistance welding machine is smaller than the width of the welding wheel; the welding process range comprises: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower connection resistance welding machine is 20000 to 25000 newtons; the speed range of the narrow tower connected with the resistance welding machine is 8-10 meters per minute; and then carrying out heat treatment on the welding seam through a high-frequency induction heating device, wherein the heating temperature of the heating device is 800 ℃, and the heating time of the heating device is 40-50 seconds. Therefore, the tower-connection resistance welding method for the steel strip with the specific welding process range is provided, and the reliability is high.
Description
Technical Field
The application relates to the field of metal welding, in particular to a tower-connected resistance welding method for a steel belt.
Background
Steel belt refers to a conveyor belt made of carbon steel as a traction and carrying member of a belt conveyor, and can also be used for bundling goods. With the development of steel strip technology, higher requirements are put on the welding of steel strips. The tower welding of steel strips is welding with tower joints, i.e. welding by joining two separate work piece joints together. The resistance welding finger is a method of welding by locally heating a weldment and applying pressure while using resistance heat generated by passing current through the weldment and a contact portion as a heat source.
With the increase of the demand for high-strength steel, the alloy components of the steel strip have higher carbon equivalent and more complex alloy components, so that the connection performance of the steel strip is difficult to guarantee by adopting the existing tower-type resistance welding method for the steel strip, the risk of the broken welding seam is higher, and the reliability is lower.
Therefore, a method of welding a steel strip with a high reliability by a resistance welding tower is desired.
Disclosure of Invention
The application provides a tower-connection resistance welding method for steel strips, which can weld the steel strips according to a specific welding process range and enables the welding to have high reliability.
In a first aspect, the present application provides a method of tower resistance welding of a steel strip, the method comprising:
welding a steel strip by a narrow tower electric resistance welding machine according to a welding process range, wherein the steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities; the tower connection width of the narrow tower connection resistance welding machine is smaller than the width of the welding wheel; the welding process range comprises: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower connection resistance welding machine is 20000-25000 newtons; the speed range of the narrow tower connected with the resistance welding machine is 8-10 meters per minute;
and carrying out heat treatment on the welding seam through high-frequency induction heating equipment, wherein the heating temperature of the heating equipment is 800 ℃, and the heating time of the heating equipment is 40-50 seconds.
In some possible implementations, the thickness of the steel strip is not less than 2.0 millimeters.
In some possible implementations, the welding process range further includes: the operating side of the narrow tower connection resistance welding machine is in the range of 1.4-2.0 mm.
In some possible implementations, the welding process range further includes: the range of the tower connection quantity of the transmission side of the narrow tower connection resistance welding machine is 3.0-3.5 mm.
In some possible implementations, the method further includes:
and (4) cutting a welding seam on the steel strip through the crescent shears, and detecting the welding seam.
In some possible implementations, the detecting includes performing a cupping performance test by cupping test.
In some possible implementations, the cupping performance test is performed by a cupping test, comprising:
when the cupping cracks were perpendicular or parallel to the weld and not peeled along the faying surface, the steel strip was considered to pass the cupping performance test.
In some possible implementations, the thickness of the steel strip is 2.1 millimeters, the current of the narrow tower electrical resistance welding machine is 24000 amperes, the electrode pressure of the narrow tower electrical resistance welding machine is 22000 newtons, the speed of the narrow tower electrical resistance welding machine is 9 meters per minute, the operating side tower pick-up of the narrow tower electrical resistance welding machine is 1.5 millimeters, the drive side tower pick-up of the narrow tower electrical resistance welding machine is 3.3 millimeters, and the heating time is 45 seconds.
In some possible implementations, the thickness of the steel strip is 2.3 millimeters, the current of the narrow tower electrical resistance welder is 25000 amperes, the electrode pressure of the narrow tower electrical resistance welder is 25000 newtons, the speed of the narrow tower electrical resistance welder is 7 meters per minute, the operating side tower capacity of the narrow tower electrical resistance welder is 1.6 millimeters, the drive side tower capacity of the narrow tower electrical resistance welder is 3.5 millimeters, and the heating time is 50 seconds.
In some possible implementations, the steel strip has a tensile strength of 1500 mpa.
The present application can further combine to provide more implementations on the basis of the implementations provided by the above aspects.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a tower-connected resistance welding method for a steel strip, which is characterized in that the steel strip is welded by a narrow tower-connected resistance welding machine according to a welding process range, wherein the steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities; the tower connection width of the narrow tower connection resistance welding machine is smaller than the width of the welding wheel; the welding process range comprises: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower connection resistance welding machine is 20000-25000 newtons; the speed range of the narrow tower connected with the resistance welding machine is 8-10 meters per minute; and then carrying out heat treatment on the welding seam through a high-frequency induction heating device, wherein the heating temperature of the heating device is 800 ℃, and the heating time of the heating device is 40-50 seconds. Therefore, the tower resistance welding method for the steel strip with the specific welding process range is provided, the toughness of the welding joint of the steel strip and the surface quality of the welding seam are good in the range, the welding performance of the steel strip is improved, and the tower resistance welding method has high reliability.
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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a tower-connected resistance welding method for a steel strip according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a narrow tower resistance welding according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart of another method for tower resistance welding of steel strips according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of another method for tower-type resistance welding of a steel strip according to an embodiment of the present disclosure.
Detailed Description
The embodiments provided in the present application will be described with reference to the drawings in the present application.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and are merely descriptive of the manner in which objects of the same nature are distinguished in the embodiments of the application.
In order to facilitate understanding of the technical solutions of the present application, some technical terms related to the present application are described below.
Resistance welding refers to a method of forming a metallic bond by heating a workpiece to a molten or plastic state by the effect of electrical resistance heat generated by current flowing through the contact surface and adjacent areas of the workpiece. The resistance welding method mainly comprises four methods of spot welding, seam welding, projection welding and butt welding. Seam welding was used for the welding of the steel strip in this example.
Resistance welding is generally a welding method in which workpieces are brought to a certain electrode pressure and a contact surface between the two workpieces is melted by resistance heat generated when a current is passed through the workpieces to achieve connection. A larger current is typically used. To prevent arcing at the interface and to forge the weld metal, pressure is applied at all times during the welding process. In such resistance welding, it is important to ensure stable welding quality of the surface of the workpiece to be welded, and it is often necessary to clean the contact surfaces between the electrode and the workpiece and between the workpiece and the workpiece before welding.
In general, the parameters of the tower resistance welding of the steel strip cannot meet the steel strip welding requirement of high-speed development, the problem of weld breakage is easy to occur, and qualified weld cannot be obtained.
In view of this, the embodiment of the present application provides a method for welding a steel strip by using a narrow tower-connected resistance welding machine, where the steel strip is welded by using the narrow tower-connected resistance welding machine, and the steel strip comprises the following chemical components by weight percent: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities; the width of the narrow tower connection resistance welding machine is smaller than that of the welding wheel; the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower connection resistance welding machine is 20000-25000 newtons; the speed range of the narrow tower connection resistance welding machine is 8-10 m/min, then the welding seam is subjected to heat treatment through high-frequency induction heating, the heating temperature is 800 ℃, the heating time range is 40-50 seconds, and the tower connection resistance welding method of the steel strip with high reliability is provided. The method has the advantages that the current range of the narrow tower-connected resistance welding machine is adjusted, so that the method has higher reliability when being applied to a steel strip with larger thickness, other parameters are correspondingly improved, the application range of the method is enlarged, the connection performance of the steel strip can be ensured, and the tower-connected resistance welding method of the steel strip with high reliability is realized.
Next, a method of welding a steel strip by a tower resistance welding method according to an embodiment of the present invention will be described with reference to the drawings.
Referring to fig. 1, a flow chart of a method for tower resistance welding of a steel strip is shown, the method comprising the steps of:
s102: and welding the steel belt by a narrow tower-connected resistance welding machine according to the welding process range.
The steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance being iron and unavoidable impurities.
The welding process range of the narrow tower-connected resistance welding machine refers to a process parameter range influencing welding quality, and the upper limit and the lower limit of the welding range can be determined through a welding test. In this embodiment, the welding process range may include: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower resistance welder is 20000 to 25000 newtons (N); the narrow tower resistance welder has a speed range of 8 to 10 meters per minute (m/min).
In some possible implementations, the welding process range for narrow tower resistance welding may also include an operating side tower pick-up range and a drive side tower pick-up range for the narrow tower resistance welding machine. Specifically, the operating side tower connection amount range of the narrow tower connection resistance welding machine can be 1.4-2.0 mm, and the transmission side tower connection amount range can be 3.0-3.5 mm.
The welding process range in the embodiment is large, so that the welding process range can be used for processing the welding of steel strips with high thickness, wherein the steel strips can be not less than 2.0 mm.
Further, the process range provided by the embodiment can also be used for carrying out tower welding resistance welding on the steel strip with the strength of 1500 MPa.
S104: and carrying out heat treatment on the welding seam by high-frequency induction heating equipment.
Wherein the heating temperature of the heating equipment is 800 ℃, and the heating time of the heating equipment ranges from 40 seconds to 50 seconds.
Due to the expansion and contraction of weld metal, the uneven temperature of a weldment caused by welding and the like, welding residual stress is generated after the welding is finished. The welding residual stress refers to internal stress remaining in a welded structure due to constraint of deformation of a welded member during welding heat. The welding residual stress has a great influence on the welded steel strip. For example, in terms of structure, welding residual stress is initial stress of a steel strip which is not loaded yet and is already on the section of the steel strip, and in the process of welding the steel strip, the welding residual stress and working stress caused by other loaded steel strips are mutually superposed to generate secondary deformation and redistribution of the residual stress, so that the rigidity and the stability of the steel strip are reduced, and the fatigue strength, the brittle fracture resistance, the stress corrosion cracking resistance and the high-temperature creep cracking resistance of the steel strip are seriously influenced under the combined action of temperature and a medium. Typically, heat treatment is used to relieve the weld after welding to reduce residual stresses.
The post-welding heat treatment can reduce the welding residual stress, stabilize the shape and size of the steel strip, reduce the distortion and improve the performance of the base metal and the welding joint. Specifically, the improvement of the plasticity of the weld metal, the reduction of the hardness of the heat affected zone, the improvement of the fracture toughness, the improvement of the fatigue strength, the recovery or the improvement of the reduced yield strength in cold forming, the improvement of the stress corrosion resistance, the release of harmful gases (such as hydrogen) in the weld metal, and the prevention of the occurrence of delayed cracking.
The post-weld heat treatment heating may be performed by various heating apparatuses, and for example, may be performed by an electromagnetic heater, an induction heater, or the like, specifically, the heating temperature is 800 degrees celsius, and the heating time is in the range of 40 to 50 seconds.
In some possible implementation manners, when the welding is finished and the welding seam enters the welding seam heating equipment, the infrared centering device in the heating equipment can be utilized to automatically center the welding seam and the flame, then the igniter is started, gas is used as gas, the heating temperature of the welding seam reaches 800 ℃ under ultraviolet flame, and the time from ignition to finishing lasts for 40-50 seconds.
In some possible implementations, the method may further include the steps of:
s106: and (4) cutting a welding seam on the steel strip through the crescent shears, and detecting the welding seam.
Crescent scissors are crescent scissors, and the crescent shape is used for eliminating stress. In this embodiment, can cut out the welding seam through the crescent moon scissors to the steel band, detect the welding seam to detect the welding effect.
In some possible implementation manners, the cupping test can be used for detecting the cupping performance, so that the welding effect can be detected. The cupping test, also known as the indentation test, is a test for evaluating the resistance of a paint film coating to cracking or separation from a metal substrate after it has been gradually deformed under standard conditions.
In this example, the steel strip was considered to pass the cupping performance test when cupping cracks were perpendicular or parallel to the weld, and not peeled along the faying surface.
In summary, the tower-connected resistance welding method for the steel strip provided by this embodiment can weld the steel strip by the narrow tower-connected resistance welding machine according to the welding process range, and then perform heat treatment on the weld joint by the high-frequency induction heating equipment, wherein the steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities, the width of the narrow tower connected with the resistance welding machine is smaller than the width of the welding wheel, and the welding process range comprises the following steps: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the pressure range is 20000 to 25000N, the speed range is 8 to 10 m/min, the heating temperature of the heating equipment is 800 ℃ and the heating time range is 40 to 50 seconds, and the tower connection resistance welding method of the steel strip with high reliability is provided.
Further, the thickness of the steel strip of the embodiment is not less than 2.0 mm, and other welding process ranges include: the tower connection range of the narrow tower connection resistance welding machine on the operation side is 1.4-2.0 mm, and the tower connection range of the transmission side is 3.0-3.5 mm.
Another embodiment of the present application is described below in conjunction with fig. 3.
S302: welding a steel belt with the thickness of 2.1 mm by a narrow tower-connected resistance welding machine according to welding process parameters, wherein the welding process parameters comprise: the current of the narrow tower connected with the resistance welding machine is 24 kilo amperes, the electrode pressure is 22 kilonewtons, the welding speed is 9 meters per minute, the operation side tower connection quantity is 1.5 millimeters, and the transmission side tower connection quantity is 3.3 millimeters.
S304: and carrying out heat treatment on the welding seam through high-frequency induction heating equipment, wherein the heating temperature is 800 ℃, and the heating time is 45 seconds.
S306: and (4) shearing a welding seam of the steel strip through the crescent scissors, and carrying out cupping test detection on the welding seam.
In some possible implementation modes, after the steel strip is welded according to the parameters, the vertical weld joint of the cupping test cracks, is not peeled off at the overlapping surface, and has no strip breakage accident in the subsequent production process.
A further embodiment of the present application is described below in conjunction with fig. 4.
S402: welding a steel belt with the thickness of 2.3 mm by a narrow tower connection resistance welding machine according to welding process parameters, wherein the welding process parameters comprise: the current of the narrow tower connected with the resistance welding machine is 25 kilo amperes, the electrode pressure is 25 kilo newtons, the welding speed is 7 m/min, the operation side tower connection amount is 1.6 mm, and the transmission side tower connection amount is 3.5 mm.
S404: and carrying out heat treatment on the welding seam by high-frequency induction heating equipment, wherein the heating temperature is 800 ℃, and the heating time is 50 seconds.
S406: and (4) cutting a welding seam on the steel strip through the crescent shears, and carrying out cupping test detection on the welding seam.
In some possible implementation manners, after the steel strip is welded according to the parameters, the vertical weld joint in the cupping test cracks, is not peeled off at the faying surface, and does not have a strip breakage accident in the subsequent production process.
In summary, the embodiment of the application provides a tower-connected resistance welding method for a steel strip, which welds the steel strip by a narrow tower-connected resistance welding machine according to a welding process range, wherein the steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities; the width of the narrow tower connection resistance welding machine is smaller than that of the welding wheel; the welding process range comprises: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower connection resistance welding machine is 20000-25000 newtons; the speed range of the narrow tower connected with the resistance welding machine is 8-10 meters per minute; and then carrying out heat treatment on the welding seam through a high-frequency induction heating device, wherein the heating temperature of the heating device is 800 ℃, and the heating time of the heating device is 40-50 seconds. Therefore, the tower resistance welding method for the steel strip with the specific welding process range is provided, the toughness of the welding joint of the steel strip and the surface quality of the welding seam are good in the range, the welding performance of the steel strip is improved, and the tower resistance welding method has high reliability.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiments of the apparatus provided in the present application, the connection relationship between the modules indicates that there is a communication connection therebetween, which may be specifically implemented as one or more communication buses or signal lines.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general-purpose hardware, and certainly can also be implemented by special-purpose hardware including special-purpose integrated circuits, special-purpose CPUs, special-purpose memories, special-purpose components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, for the present application, the implementation of a software program is more preferable. Based on such understanding, the technical solutions of the present application may be substantially embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, an exercise device, or a network device) to execute the method according to the embodiments of the present application.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, training device, or data center to another website site, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a training device, a data center, etc., that incorporates one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
Claims (10)
1. A method of towering resistance welding a steel strip, the method comprising:
welding a steel strip by a narrow tower electric resistance welding machine according to a welding process range, wherein the steel strip comprises the following chemical components in percentage by weight: carbon is less than or equal to 0.30 percent; silicon is less than or equal to 0.50 percent; manganese is less than or equal to 1.5 percent; phosphorus is less than or equal to 0.030 percent; sulfur is less than or equal to 0.010 percent; the balance of iron and inevitable impurities; the tower connection width of the narrow tower connection resistance welding machine is smaller than the width of the welding wheel; the welding process range comprises the following steps: the current range of the narrow tower connection resistance welding machine is 23000-25000 amperes; the electrode pressure range of the narrow tower connection resistance welding machine is 20000-25000 newtons; the speed range of the narrow tower connected with the resistance welding machine is 8-10 meters per minute;
and carrying out heat treatment on the welding seam through high-frequency induction heating equipment, wherein the heating temperature of the heating equipment is 800 ℃, and the heating time range of the heating equipment is 40-50 seconds.
2. The method of claim 1 wherein the steel strip has a thickness of no less than 2.0 mm.
3. The method of claim 1, wherein the welding process range further comprises: the operating side tower connection quantity range of the narrow tower connection resistance welding machine is 1.4-2.0 mm.
4. The method of claim 1, wherein the welding process range further comprises: the tower connection range of the transmission side of the narrow tower connection resistance welding machine is 3.0-3.5 mm.
5. The method of claim 1, further comprising:
and cutting the welding line of the steel strip through the crescent shears, and detecting the welding line.
6. The method of claim 5, wherein said detecting comprises performing a cupping performance test by cupping test.
7. The method of claim 6, wherein said performing a cupping performance test by cupping test comprises:
the steel strip is considered to pass the cupping performance test when cupping cracks are perpendicular or parallel to the weld seam and not peeled along the faying surface.
8. The method of claim 1, wherein the steel strip has a thickness of 2.1 millimeters, the current of the narrow tower electrical resistance welder is 24000 amperes, the electrode pressure of the narrow tower electrical resistance welder is 22000 newtons, the speed of the narrow tower electrical resistance welder is 9 meters per minute, the operating side tower pick-up of the narrow tower electrical resistance welder is 1.5 millimeters, the drive side tower pick-up of the narrow tower electrical resistance welder is 3.3 millimeters, and the heating time is 45 seconds.
9. The method of claim 1, wherein the steel strip has a thickness of 2.3 mm, the narrow tower electrical resistance welder has a current of 25000 amps, the narrow tower electrical resistance welder has an electrode pressure of 25000 newtons, the narrow tower electrical resistance welder has a speed of 7 meters per minute, the narrow tower electrical resistance welder has an operating side tower pick-up of 1.6 mm, the narrow tower electrical resistance welder has a drive side tower pick-up of 3.5 mm, and the heating time is 50 seconds.
10. The method of claim 1, wherein the steel strip has a tensile strength of 1500 mpa.
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| CN202110872583.7A CN115673501A (en) | 2021-07-30 | 2021-07-30 | Tower connection resistance welding method for steel belt |
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| CN202110872583.7A CN115673501A (en) | 2021-07-30 | 2021-07-30 | Tower connection resistance welding method for steel belt |
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