JPH08197245A - Welding method for metal strip and equipment therefor - Google Patents

Abstract

PURPOSE: To determine welding condition for a metal strip, to simply control the result and to automatically use it in high precision. CONSTITUTION: The input data of material, shape, etc., of preceding/succeeding metal strips is read in (n1), based on work standard (n2), weldablity is technically confirmed (n3). By investigating whether the welding data of welding method/condition, etc., corresponding to the input data exists or not (n6), by confirming whether welding result is good or not (n7), the welding data is determined/read in (n9). In the case of no data, it is determined as inferred from the welding data having good welding result similar to the input data (n10). In the case of no good result, the welding condition is determined from experiment (n12), it is displayed on a display screen (n13), transmitted to a welding machine (n14), welding is executed. The determined welding data and welding result are respectively discriminated/stored in a memory (n19) after welding completion (n16), further after succeeding treatment or successive working treatment (n18).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for welding a metal strip, which is preferably used in a continuous treatment line such as a continuous rolling facility or a continuous processing line.

[0002]

2. Description of the Related Art Generally, metal strips such as stainless steel strips and high nickel alloy strips are subjected to hot rolling, cold rolling, pickling, annealing, temper rolling, etc. Each is subjected to necessary continuous processing and continuous processing, and commercialized.

In each of these steps, the metal strip is continuously threaded by, for example, sequentially connecting a plurality of metal strip coils.
As an example thereof, an outline of a typical conventional continuous cold rolling line will be described with reference to FIG.

The continuous cold rolling line is equipped with a rewinding machine 31.
And welding machines 32a and 32b (generally referred to as 32), an entrance looper 33, a rolling machine 34, an exit looper 35, a shear 36, and a winder 37. .

The metal strip 41, which is sequentially unwound from the metal strip coil set on the payoff reel of the illustrated rewinding machine 31 and fed into the continuous cold rolling line, is the same as the preceding metal strip preceding by the welding machine 32. The end or the end and the end or the end of the trailing trailing metal strip are joined by welding and passed through the entry looper 33 to the cold rolling mill 34. The metal strip 41 which has been passed through the cold rolling mill 34 and cold rolled passes through the exit side looper 35 and the shear 36, and the winding machine 3
It is wound on the tension reel No. 7 again as a cold-rolled metal strip coil.

The welding machines 32a and 32b are welding machines having different welding methods and models, such as a flash butt welding machine and a mash seam welding machine. Depending on the type of the metal strip and the trailing metal strip that is passed after the strip, such as the steel type, and the strip conditions for the metal strip, including the plate thickness and strip width, the welding method, model, and other conditions may be determined. The welding conditions to be included are determined. The welding conditions and the results of cold rolling of the welded portions of the metal strips, which are performed after the metal strips are sequentially welded and joined, are recorded by a worker on a management sheet as shown in FIG. 4 every time welding is performed. . When performing welding, the worker performed the most recently from the recorded control sheet and examined the welding conditions when the cold rolling result of the weld was good, and the welding method, model and other conditions. Welding conditions including is determined and set.

Further, in the welded portion between the metal strips, a welded portion is likely to be cracked at the end portions of the metal strips in the widthwise direction of the metal strip, or the welding is incomplete, so that a welding defect is likely to occur.
Further, the stress may be concentrated on both ends of the welded part in the plate width direction, so that the welded part may be broken. Therefore, the cutting device cuts off the part indicated by the chain double-dashed line in FIG.
The cut metal piece is called clipping, and a clipping bending test is performed to check the quality of the weld. In the test, one end of the clipping is fixed with a vise, and a stress is applied by hitting with a hammer to bend the clipping which was a flat plate shape by about 90 degrees, and cracks or cracks are generated in the welded portion. It is to check if it occurs. In the test, if the weld has cracks or cracks, or if the weld of the metal strip itself has welding defects such as cracks that can be visually recognized, re-weld or weld. It is prohibited to subject the welded portion to a processing treatment such as cold rolling which is performed in a later process in the same line after joining.

[0008]

In the above-mentioned prior art, the welding conditions determined and set by the type of the preceding metal strip and the following metal strip and the combination of the plate thickness, the plate width, the shape, etc. Is managed using a management sheet that is recorded by hand. Therefore, when newly performing welding, an operator must manually check the control sheet to determine and set welding conditions, which takes a lot of time, and accuracy may be lost due to mistakes. In some cases, the accuracy may be lost. In addition, the welding defect rate, the number of weldings, the results of the clipping bending test, the presence or absence of defects after cold rolling, etc. are totaled at regular intervals to correct the welding conditions. In addition, since the worker looks at the management sheet and does it manually, it takes time, and the accuracy and precision may be lacking.

Further, in the prior art, if the combination of the preceding metal strip and the trailing metal strip has not been implemented in the past, there is no record on the management sheet, and therefore the welding conditions cannot be determined.

An object of the present invention is to determine welding conditions for welding a metal strip, and manage the results by simply recording (memorizing), totalizing or correcting them, and automatically and accurately afterwards. It is to provide a welding method and apparatus that can be used for

[0011]

DISCLOSURE OF THE INVENTION The present invention is a method of welding a metal strip for successively treating metal strips by sequentially joining front and rear ends or front and rear end portions of a plurality of metal strips. At least the type, the plate thickness and the plate width, and the welding conditions are set in advance as data for each of the band and the following metal band and stored in a memory, and the preceding metal band and the following metal band to be welded are set. Characteristic of inputting input conditions including at least type, plate thickness and plate width, and welding a preceding metal band and a succeeding metal band according to welding conditions corresponding to data read from a memory based on the input conditions It is a method of welding a metal band. Further, in the present invention, the welding conditions that meet the input conditions are not stored in the memory, the type of metal strip is the same as the input conditions, and the welding conditions in the upper and lower ranges predetermined with respect to the plate thickness and the plate width Is stored in the memory, the welding conditions are individually determined by performing interpolation calculation of the data in the upper and lower ranges. Further, according to the present invention, data matching the input condition is not stored in the memory,
Also, if there is no data on the welding conditions of the same upper and lower limits for the thickness and width of the metal strip that are the same as these input conditions, the welding conditions that give good results by conducting an experiment in advance. Is stored in the memory as data. Further, the present invention, if there is data in the upper and lower ranges that meet the above-mentioned input conditions or is predetermined, and the result of welding according to the welding conditions of the data is determined to be poor, conduct an experiment in advance and obtain a good result. It is characterized in that the welding conditions for obtaining the result are stored in the memory as data. The present invention also includes, as the input conditions, the composition of the metal strip, the type and amount of inclusions contained, at least the amount of reduction applied to the weld, the amount of load including tension, and the weld receiving during continuous processing. It is characterized in that data regarding the minimum bending radius is stored in a memory in advance. Further, the present invention is characterized in that after welding, a quality judgment test of a welded portion is performed, and the judgment result is stored in a memory as data in accordance with an input condition. Further, the present invention is characterized in that the metal strips are sequentially welded, the sequentially joined metal strips are continuously processed, and then the quality judgment result of the welded portion is stored in the memory corresponding to the input condition. Further, the present invention is a welding device for a metal strip for sequentially processing the front and rear ends or front and rear end portions of a plurality of metal strips to continuously process the metal strips. For each, at least the type, plate thickness and plate width, a memory for presetting and storing welding conditions and storing as data, and at least the type, plate thickness and plate width for the leading metal band and the trailing metal band to be welded. In response to the input means for inputting the input condition including the input condition, the data is read out from the memory based on the input condition, and is followed by the preceding metal strip under the welding condition corresponding to the data. A welding device for a metal band, comprising: welding means for welding a metal band.

[0012]

According to the present invention, there is provided a metal strip welding method for successively treating metal strips by sequentially joining front and rear ends or front and rear end portions of a plurality of metal strips. Type, plate thickness and plate width including at least, for example, steel type, for each of the preceding metal strip that is passed through in advance and the trailing metal strip that is passed through in the manufacturing or processing line for continuous processing. And the welding conditions corresponding to them are preset as data and stored in the memory,
Enter the input conditions including at least type, plate thickness and plate width for the leading metal band and the trailing metal band to be welded,
The leading metal strip and the trailing metal strip can be welded under the welding condition corresponding to the data read from the memory based on the input condition. Therefore, it is possible to mechanically check the welding condition according to the input condition in a short time, and automatically determine and set the accurate and accurate welding condition.

For this reason, the leading metal band and the trailing metal band can be welded by forming a welded portion without cracks or cracks, and the two can be soundly and sequentially joined together. It is possible to safely and stably perform the required continuous processing and continuous processing on the processing line. In particular, even if such a weld is subjected to cold rolling and a large amount of load is applied to this weld, including reduction, tension, severe bending, etc., abnormalities such as fracture of the weld occur and it is impossible to pass the plate. It is possible to safely and stably pass the metal strip including this welded part and perform continuous processing and continuous processing without falling into the form, so that not only damage due to accidents but also workability, efficiency and productivity can be prevented. Further, the quality of the metal strip subjected to such a treatment and the production yield / inspection yield thereof are improved, which leads to cost reduction.

Preferably, the welding conditions that meet the input conditions are not stored in the memory, the type of metal strip is the same as the input conditions, and the welding is performed in the upper and lower ranges predetermined with respect to the plate thickness and the plate width. When the conditions are stored in the memory, based on the welding data of the predetermined upper and lower welding conditions, interpolation calculation is performed using such welding data, and welding conditions suitable for the input conditions are obtained. It can be decided individually.

Therefore, even if the welding data of the welding condition corresponding to this input condition does not exist in the memory, it is possible to determine the corresponding welding condition by performing the arithmetic processing from the existing welding data. Can be welded.

[0016] Preferably, the welding conditions that meet the input conditions are not stored in the memory, the type of metal strip is the same as the input conditions, and the upper and lower ranges determined in advance with respect to the plate thickness and the plate width are set. If the welding data of the welding condition of No. is not stored in the memory, or the result of performing the welding according to the welding condition estimated by performing the arithmetic processing from the welding data existing in the memory as described above is the welding after welding. If there is a failure in the quality judgment test of the part or the quality judgment result of the welded part after continuous processing or continuous processing, in any case, an experiment is performed in advance and the welding conditions that give good results are the welding data. Can be stored in memory as.

Therefore, the input condition stored in the memory and the welding condition corresponding to this input condition are added, and not only are they completely completed, but also
Since such welding conditions are highly accurate and increase in accuracy, the occurrence of welding defects can be prevented in any case.

Preferably, as the input conditions, not only the type of the metal strip including, for example, a steel type, the plate thickness and the plate width, but also the nominal size of the plate thickness and the plate width,
Measured size and its variation, composition and structure of metal strip, type and amount of inclusions in metal strip (cleanliness), surface texture at front and rear edges of metal strip (presence or absence of surface flaws and deafness), Data such as the shape, at least the amount of reduction applied to the metal band weld during continuous processing or continuous processing, the load including tension, and the bending (minimum bend radius) that this weld receives are stored in advance in memory. Can be set.

Therefore, as the input condition, not only the specification of the metal strip but also the load condition received by the welded portion of the metal strip in the continuous manufacturing or processing line, and further up to the equipment specification of the line, Since detailed and high-precision input conditions are input, welding conditions that meet or correspond to such detailed and high-precision input conditions
Welding data is gradually added based on the above-mentioned various quality judgment results and experimental results conducted in advance, and it is complete with high accuracy and accuracy while correcting (correcting) even the subtle parts. It Therefore, the welding conditions can be determined and set more accurately, and in any case, the occurrence of welding defects can be prevented.

Further, preferably, a quality judgment test of the welded part itself is carried out after welding, and the judgment result is stored as data in a memory corresponding to the input condition, so that the welding condition does not cause welding failure and the other does not. And
It is possible to increase the precision and accuracy while correcting (correcting) even the delicate parts corresponding to the high-precision input conditions described above. It becomes possible to more accurately determine and set the welding conditions.

Further preferably, the metal strips are sequentially welded,
After continuous processing or continuous processing of the sequentially joined metal strips, the quality judgment result of the welded part is stored in the memory corresponding to the above input condition. Regarding the welded part of the formed metal band, not only the quality of the welded part itself, but also the presence or absence of load on the welded part in the manufacturing or processing line, the load amount (load condition), and each point up to the equipment specifications of the line The most important and comprehensive judgment can be made. Then, by storing such a comprehensive good / bad judgment result in a memory, an experiment or examination is further made based on the judgment result in advance, and in any case, a comprehensive good result is obtained. By storing the welding conditions that produce the results in the memory as welding data, the welding data can be added and corrected (corrected), and the welding conditions can be determined and set more accurately. As a result, it becomes possible to prevent the occurrence of welding defects. In addition, since both the comprehensive quality judgment result of the welded part and the quality judgment result of the above-mentioned welded part are mechanically and reliably stored in the memory, the statistical processing can be performed mechanically. For example, it is possible to statistically analyze the defect rate and defect tendency of the welded portion mechanically by type of metal strip, plate thickness and plate width.

Further, according to the present invention, the front and rear ends or front and rear ends of a plurality of metal strips are sequentially joined to each other to provide a metal strip welding apparatus for continuously treating the metal strips. For each trailing metal strip that follows,
At least a type, a plate thickness and a plate width, and a welding condition corresponding thereto are preset and stored as data, an input unit for inputting the input condition, and a response to the input unit input to the input unit. Since the welding means for reading the data based on the input condition from the memory and welding the preceding metal strip and the trailing metal strip under the welding condition corresponding to the data is provided, the welding according to the welding condition according to the input means can be performed. It can be carried out.

[0023]

FIG. 1 is a schematic explanatory view of a continuous cold rolling line using the present invention. FIG. 2 is a flowchart showing the welding operation according to the embodiment of the present invention.

As shown in FIG. 1, the continuous cold rolling line includes a rewinding machine 1 and welding machines 2a and 2b (collectively referred to as 2
And an input side looper 3, a cold rolling mill 4, an output side looper 5, a shear 6, a winder 7, a control means 8, an input means 9, and a display means 10. Composed of. Also,
After the welding machine 2 or before the shear 6, a pickling facility, an annealing facility or the like may be installed as required, and these facilities may be combined to form a single production line.

The metal strip 11 which is unwound from the metal strip coil set on the payoff reel of the illustrated rewinding machine 1 and fed into the continuous cold rolling line is the end or the end portion of the preceding metal strip and the trailing metal strip. The tip or tip of the welding machine 2
Joined by being welded by. Welding machine 2
Is heated by generating a spark between both ends of the preceding metal band and the leading end of the trailing metal band by applying a voltage from a state in which there is a space between the ends and the leading end of the trailing metal band, When both ends are uniformly heated and melted, a flash butt welding machine that suddenly abuts them and collides them to join them, usually a plurality of pressure-inserted states in which the end portion and the tip portion are overlapped. A spot welding machine that applies a large current to the rod-shaped electrode in a short time to form a molten portion and joins it, presses the overlapping portion of the metal strip using a disc electrode instead of multiple rod electrodes of spot welding, A seam welding machine that rotates the disk electrode around the center axis of the disk electrode and continuously repeats spot welding while rolling the disk electrode itself in the width direction of the metal strip, which is a kind of seam welding and welds overlapping parts. Crush while Mash seam welding machine for joining Te,
Alternatively, one of a MIG welding machine or the like that performs welding by generating an arc between an electrode and a metal realized by the same or similar metal as the metal band in an inert gas atmosphere, or a welding method and model. Different welding machines 2a, 2b
Are installed in succession. Although specific welding conditions for these different welding methods and models will not be described in detail, a brief description will be as follows.

Various welding conditions when a flash butt welding machine is installed include, for example, a gauge bar (m
m), upset cost (mm), final electrode spacing (m
m), cam motor speed (m / mm), upset time (ms), transformer tap (V), phase control (first period),
Phase control (upset), phase control (latter stage), etc.

In the case of a seam welder or a narrow lap seam welder, the swaging overlap margin (mm), main current (A), initial current (A), welding speed (m / min), swaging speed (m / min) , Energizing time (min),
There is a cooling time (min) and the like.

In the case of a mash welder, current (A), speed (m / min), electrode pressure (kg), planish pressure (kg), swaging overlap (mm),
There is an electrode stacking margin (mm).

In the case of a MIG welding machine, the torch position (m
m), welding voltage (V), welding current (A), welding speed (m
/ Min), buttocks gap margin (mm), etc.

The metal strip 11 is welded by either one of the welding machines 2a and 2b having the above welding conditions. The control means 8 selects the welding size and model and determines the welding conditions. Be seen. The control means 8 comprises a processing circuit 8a and a memory 8b.
a is a type of welding machine used and various welding conditions corresponding to input conditions including at least the type of the metal strip 11 including the steel type, the plate thickness and the plate width, which are input from the input means 9, and various welding conditions are read from the memory 8b, The welders 8a and 8b are controlled according to the welding conditions. Alternatively, the contents of both the input condition and the welding condition may be displayed on the display means 10, and the operator may visually confirm the display means 10 and operate the welding machines 2a and 2b according to the displayed contents. The memory 8b stores data based on the input conditions and welding conditions corresponding to the data. As the input conditions, first, there are the basic leading and trailing metal strips themselves, the load condition that the welded part of the metal strip itself receives in a continuous manufacturing or processing line, and this load condition. The conditions according to the equipment specifications of the line are stored as data.

Of these input conditions, the first and second metal strips themselves are basically required to have at least the type of metal strip, the plate thickness and the strip width, but only this type of metal strip. Instead, the composition and texture, the type and amount of inclusions contained in the metal strip (cleanliness), the surface texture (presence or absence of surface flaws and edge cuts) and shape at the front and rear edges of the metal strip can be stored. Regarding the plate thickness and the plate width, it is preferable to store not only the nominal size but also the measured size, especially the measured size at the front and rear ends of the metal strip and the variation thereof.

As the load conditions that the welded part receives, the load applied to the welded part includes at least the amount of reduction, the amount of deformation, the tension and the like, and the metal strip in the strip is installed in the line. It is preferable to store the data regarding the bending (minimum bending radius) load which the welded portion receives under a relatively large tension by a roll or the like with which the welded portion of 1 directly contacts.

The entry side looper 3 is provided so as not to stop the cold rolling in the cold rolling mill 4 while the front and rear ends or front and rear ends of the metal strip are stopped and the above-mentioned welding is performed. Inside is the metal strip 1 stored in the entrance looper 3.
1 is sent to the cold rolling mill 4. This cold rolling mill 4 has 4
It is realized by a cold rolling mill such as a heavy or six-fold cold rolling mill, a cluster mill (multi-stage rolling mill) typified by a 20-high Sendzimer mill, or a combination thereof.
The metal strip 11 is passed through the inside of the cold rolling mill 4 and cold-rolled, and is wound as a metal strip coil on the tension reel of the winding machine 7 via the exit looper 5 and the shear 6. Further, the metal strip 11 is cut by the shear 6 in the vicinity of the welded portion. The exit side looper 5 stops the cold rolling in the cold rolling mill 4 until the metal strip 11 is cut, the cut preceding metal strip is wound, and the following metal strip is started to be wound. The metal band 11 is stored in the exit side looper 5 during this period.

The welding conditions are determined as shown in the flow chart of FIG. When the input condition is input from the input means 9, the process proceeds to step n1. In step n1, the type and composition of the input preceding metal strip and the following metal strip, the material and properties such as the type and amount of inclusions and the surface properties, the dimensional accuracy conditions such as the plate thickness and the plate width, Read input data such as the tension condition applied to the weld, or the minimum bending radius applied during continuous processing. Step n2
Then, the input data and the work standard stored in advance in the memory 8b or the like are compared and judged. The work standard stipulates the range in which welding by welding is allowed when the materials of the preceding metal band and the trailing metal band to be welded and joined are different, and when welding is possible based on the work standard. Proceeds to step n3, otherwise proceeds to step n4
Proceed to. In step n3, the types of materials such as the preceding metal band and the following metal band, the plate thickness, the plate width, etc. are compared, and the difference in plate thickness or plate width is too large, and the types such as the material are greatly different. Determine whether welding is possible or not, depending on the reason. If possible, in step n5, the welding data corresponding to the input method, such as welding method and model, is retrieved from the memory. Otherwise, in step n4, the welding cannot be performed for some reason. A message is displayed on the display screen, and the process ends.

In step n6, the welding data is stored in the memory 8
It is determined whether or not it is stored in b, and if so, the process proceeds to step n7, and if not, the process proceeds to step n.
Proceed to 8. Welding data corresponding to input data is stored in memory 8
If it is not stored in b, in step n8, the input data read in step n1 is centered and the upper and lower sides of the input data correspond to input data within a predetermined range, and the welded portion after welding. It is determined whether or not the welding data having a good result of the pass / fail judgment test exists in each of the range above and below the value of the input data read in step n1. That is, when there is a pair of welding data described above, the process proceeds to step n10,
All welding conditions of the pair of welding data are interpolated and analogized to determine the current welding conditions. by this,
Even if the welding data corresponding to the input data is not stored in the memory 8b, the welding condition can be determined. Otherwise, that is, there is welding data with good welding results corresponding to the input data in the upper or lower range, but welding data with good welding results corresponding to the input data in the other lower or upper range. Is not present, welding data with good welding results does not exist in the upper and lower ranges, or welding data corresponding to input data in the upper and lower ranges exists regardless of whether the welding results are good or bad. If not, the process proceeds to step n11.

If the welding data corresponding to the input data is stored in the memory 8b, it is judged in step n7 whether or not the welding result of the welded portion when the welding is performed is good, If so, that is, if the welding result of the welded portion is good, the welding data is read in step n9 and the process proceeds to step n13. This makes it possible to examine the welding data in a short period of time and determine the welding conditions. If not, that is, if the welding result is poor, a request for welding data corresponding to the input data is displayed on the display screen in step n11. Also, when using this method to determine the schedule for passing the metal plate through the line,
After displaying the request for welding data in step n11, in step n12, a welding experiment is performed using a short-length metal strip having the material, plate thickness, plate width, etc. of the input conditions, and the welding result is good. Determine the conditions.

When the welding data is read in step n9 or the welding condition is determined in step n10 or step n12, the welding data read in the display device or the welding data of the determined welding condition is displayed in step n13. . In step n14, the welding data is transferred to the welders 2a and 2b, and in step n15, the metal strip is passed through the welder to perform welding. Further, the welding data may be manually input by an operator while looking at the display screen.

At step n16, the quality of the welded portion is judged by a clipping bending test or the like. Step n17
Then, continuous processing or continuous processing such as continuous cold rolling by the cold rolling mill 4 shown in FIG. 1 is performed. In step n18, the quality of the welded portion of the processed metal strip is determined.

At step n19, the quality judgment results of the welded portions at steps n16 and n18 are stored and recorded in the memory area of the memory 8b corresponding to the input conditions. In any of the above cases, regarding the welded part of the continuously processed metal strip, not only the quality of the welded part itself but also the presence or absence of load on the welded part in the manufacturing or processing line and the load amount (load condition) ) And the most important and comprehensive judgment based on each point up to the equipment specifications of such line. Then, by storing such a comprehensive quality determination result in the memory 8b or the like, further experiment or examination is made based on the determination result, and in any case, comprehensively. By storing the welding conditions that give good results as welding data in the memory 8b or the like, the welding data can be added and corrected (corrected) so that the welding conditions can be determined and set more accurately. become. As a result, it becomes possible to effectively prevent the occurrence of welding defects. In addition, since both the comprehensive quality determination result of the welded portion and the quality determination result of the welded portion described above are mechanically and reliably stored in the memory 8b or the like, mechanical statistical processing is performed. Is possible. For example, it is possible to statistically analyze the defect rate and defect tendency of the welded portion by mechanically stamping for each type of metal strip, plate thickness and plate width. Furthermore, the welding defect rate or the number of times of welding for each fixed period can be totaled and made into a graph, for example.

[0040]

As described above, according to the present invention, there is provided a metal strip welding method for successively treating metal strips by sequentially joining front and rear ends or front and rear end portions of a plurality of metal strips, For each of the preceding metal band and the following metal band, at least the type including the steel type, the plate thickness and the plate width, and the welding conditions corresponding to them are preset as data and stored in the memory. If you enter input conditions including at least the type, plate thickness and plate width for the preceding metal band and the following metal band to be welded, the welding conditions corresponding to the data read from the memory based on the input conditions will be used as the leading metal band and the trailing metal band. Since the row metal band is welded, the welding condition corresponding to the input condition can be checked in a short time to determine the welding condition.
This makes it easy to determine the welding conditions when welding metal strips and retrieve the results,
It can be managed by totalization or correction and can be used automatically accurately and accurately, and the time required therefor can be reduced.

Further, according to the present invention, the welding conditions that match the input conditions are not stored in the memory, and the type of metal strip is the same as the input conditions, and the plate thickness and the plate width are preliminarily set. When the welding conditions in one of the upper and lower ranges to be defined are stored in the memory, the welding conditions are individually determined by performing the interpolation calculation of the data in the other range. Even if the welding condition corresponding to the input condition does not exist in the memory, it is possible to easily determine the welding condition that can obtain a good result, and not only to prevent the damage due to the welding accident,
It is possible to improve the work efficiency of the welding process, improve the quality of the metal strip to be processed, improve the inspection yield, and further reduce the cost.

Further, according to the present invention, the welding conditions that meet the input conditions are not stored in the memory, and the type of metal strip is the same as the input conditions. If the welding condition data for the specified upper and lower ranges is not stored in the memory, or if the results of welding performed according to the welding conditions inferred from the above range data are poor, then perform an experiment in advance Since the welding conditions that can obtain various results are stored in the memory as data, welding conditions that can obtain good welding results corresponding to the input conditions will be added, increasing the accuracy with high accuracy and eliminating welding defects. Can be prevented.

Further, according to the present invention, the input conditions include not only the type of the metal strip, such as the type of steel, the plate thickness and the plate width, but also the nominal size, the measured size or the variation of these, the composition or the structure, and the metal band. The data on the type and amount of inclusions contained in, the amount of reduction at least applied to the metal band weld during continuous processing or continuous processing, the load including tension, and the bending that the weld receives are stored in advance in a memory. Since it is stored, it is possible to more accurately determine and set the welding conditions corresponding to the highly accurate input conditions, and it is possible to further suppress the occurrence of welding defects.

Further, according to the present invention, after welding, a quality judgment test of the welded part itself is performed, and the judgment result is stored as data in the memory corresponding to the input condition, so that the welding condition causes a welding failure. It is possible to determine and set more accurate welding conditions in accordance with the above-mentioned detailed and highly accurate input conditions by distinguishing them from those not. This makes it possible to eliminate welding conditions that cause welding defects.

Further, according to the present invention, the quality of the welded portion is determined after continuously processing the welded metal strips. For welded parts of continuously processed metal strips, not only the quality of the welded part itself but also the presence or absence of load on the welded part in the manufacturing or processing line, load amount (load condition) and equipment specifications of such line The most important and comprehensive judgment can be made based on the above points. Then, by storing such a comprehensive good / bad judgment result in a memory, an experiment or examination is further made based on the judgment result in advance, and in any case, a comprehensive good result is obtained. By storing the welding conditions that produce the results in the memory as welding data, the welding data can be added and corrected (corrected), and the welding conditions can be determined and set more accurately. result,
It becomes possible to prevent the occurrence of welding defects. In addition, since both the comprehensive quality judgment result of the welded part and the quality judgment result of the above-mentioned welded part are mechanically and reliably stored in the memory, the statistical processing can be performed mechanically. For example, it is possible to statistically analyze the defect rate and defect tendency of the welded portion mechanically by type of metal strip, plate thickness and plate width.

Further, according to the present invention, a front metal strip and a rear metal strip are provided as a metal strip welding apparatus for successively processing the metal strips by sequentially joining the front and rear ends or the front and rear ends of a plurality of metal strips. For each band, at least the type, plate thickness and plate width, and a memory that stores the corresponding welding conditions as data, and at least the type, plate thickness and plate width of the preceding metal band and the trailing metal band to be welded. And an input means including, and reading data based on the input condition from the memory corresponding to the input condition input to the input means,
Since the welding means for welding the leading metal strip and the trailing metal strip under the welding conditions corresponding to the data is provided, welding can be performed under the welding conditions corresponding to the input conditions, and the incidence of welding defects is reduced. be able to.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a continuous cold rolling line using the present invention.

FIG. 2 is a flowchart showing a welding operation according to an embodiment of the present invention.

FIG. 3 is a schematic explanatory view of a continuous cold rolling line using a typical conventional technique.

FIG. 4 is a diagram showing an example of a management sheet.

FIG. 5 is a plan view of the vicinity of a welded portion of a metal band 41.

[Explanation of symbols]

 1 Rewinder 2, 2a, 2b Welding machine 3 Inlet looper 4 Cold rolling mill 5 Outlet looper 6 Shear 7 Winder 8 Control means 8a Processing circuit 8b Memory 9 Input means 10 Display means 11 Metal band

Claims (8)

[Claims] 1. A method for welding a metal strip for successively treating the front and rear ends or front and rear end portions of a plurality of metal strips to continuously process the metal strips, the method comprising: For each of them, at least the type, plate thickness and plate width, and welding conditions are preset as data and stored in memory, and at least the type, plate thickness and plate width of the leading metal band and trailing metal band to be welded are stored. A welding method for a metal strip, comprising: inputting an input condition including: and welding a leading metal strip and a following metal strip under welding conditions corresponding to data read from a memory based on the input condition. 2. A welding condition which is not stored in a memory, and which is the same kind of metal strip as the input condition and has a predetermined upper and lower range with respect to its thickness and width. 2. The welding method for a metal strip according to claim 1, wherein the welding conditions are individually determined by performing interpolation calculation of data in the upper and lower ranges when the is stored in the memory. 3. Welding in the upper and lower ranges which are not stored in the memory and which have the same metal strip type as the input conditions and which are predetermined with respect to the plate thickness and the plate width. 2. The method for welding a metal strip according to claim 1, wherein when there is no condition data, an experiment is conducted in advance and the welding conditions for obtaining good results are stored as data in a memory. 4. When there is data in the upper and lower ranges which meet the input conditions or which are predetermined and the result of welding according to the welding condition of the data is judged to be defective, an experiment is conducted in advance to obtain a good result. The welding method for a metal strip according to claim 1, wherein the welding conditions for obtaining a result are stored as data in a memory. 5. The input conditions include the composition of the metal strip, the type and amount of inclusions contained, at least the amount of reduction applied to the weld, the amount of load including tension, and the weld receiving during continuous processing. The method for welding a metal strip according to claim 1, wherein data on the minimum bending radius is stored in a memory in advance. 6. After welding, a quality judgment test of the welded portion is conducted,
The method of welding a metal strip according to claim 1, wherein the determination result is stored as data in a memory in accordance with an input condition. 7. The metal bands are sequentially welded, and the sequentially joined metal bands are continuously processed, and then the quality judgment result of the welded part is stored in a memory corresponding to the input condition. The method for welding a metal strip according to any one of 1 to 5. 8. A welding device for a metal strip for sequentially treating the front and rear ends or front and rear ends of a plurality of metal strips to continuously process the metal strips. For each, at least the type, plate thickness and plate width, and the memory for presetting the welding conditions and storing as data, and at least the type, plate thickness and plate width for the preceding metal band and the trailing metal band to be welded Input means for inputting the input conditions including the data, and in response to the input conditions input to the input means, data is read from the memory based on the input conditions, and the preceding metal band follows the welding conditions corresponding to the data. A welding device for a metal strip, comprising: welding means for welding the metal strip.