WO2018181397A1 - 帯状板体の溶接判定装置および溶接判定方法 - Google Patents
帯状板体の溶接判定装置および溶接判定方法 Download PDFInfo
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- WO2018181397A1 WO2018181397A1 PCT/JP2018/012579 JP2018012579W WO2018181397A1 WO 2018181397 A1 WO2018181397 A1 WO 2018181397A1 JP 2018012579 W JP2018012579 W JP 2018012579W WO 2018181397 A1 WO2018181397 A1 WO 2018181397A1
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- Prior art keywords
- temperature
- welding
- joint
- threshold value
- steel strip
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- 238000003466 welding Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims description 19
- 238000005259 measurement Methods 0.000 claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 abstract description 53
- 239000010959 steel Substances 0.000 abstract description 53
- 230000007547 defect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 21
- 238000003860 storage Methods 0.000 description 14
- 239000000428 dust Substances 0.000 description 12
- 230000009467 reduction Effects 0.000 description 12
- 238000005304 joining Methods 0.000 description 11
- 238000005554 pickling Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
- B23K11/061—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
-
- 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
- B23K31/12—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 investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
-
- 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
Definitions
- the present disclosure relates to a welding determination device and a welding determination method for a belt-like plate body at a joint portion of the belt-like plate members joined by seam welding.
- a strip-shaped plate body such as a steel strip
- a strip-shaped plate body is manufactured by hot or cold rolling a steel ingot or the like.
- pretreatment such as pickling or application of rust-preventing oil
- each treatment is performed on each strip plate body, resulting in poor production efficiency and practical use. Not right. For this reason, the method of performing these processes continuously by welding the edge part of the longitudinal direction of each strip
- seam welding which is a kind of lap resistance welding, is used as a method for welding the strip-shaped plate body.
- the belt-like plate body is continuously welded by energizing the joint portion where the end portions of the belt-like plate body are overlapped with each other while rotating the pair of electrode wheels.
- joint failure may occur at the joint, and the joint may break in the production line due to the joint failure, and the production line may stop. If the production line stops due to the rupture of the belt-shaped plate, in addition to reducing the production line's operating rate, it takes a long time to restore the production line and increases repair costs associated with repairs. .
- Patent Document 1 as a welding determination method for a steel strip that is a strip-shaped plate body, the temperature of a welded portion immediately after welding is measured, and a threshold value corresponding to the measured temperature and the thickness of the steel strip is measured. Therefore, a method for determining a bonding failure is disclosed.
- the average temperature at the joint part, and the joint A temperature difference that is a difference between a maximum value and a minimum value of the temperature in the portion is calculated, and when the average temperature is equal to or lower than the first threshold value and the temperature difference is equal to or higher than the second threshold value, And a determination unit for determining that a bonding failure due to the reactive current has occurred.
- the measurement result in the measurement step, the average temperature in the joint portion, and the above A calculation step of calculating a temperature difference that is a difference between a maximum value and a minimum value of the temperature at the joint, and when the average temperature is equal to or lower than a first threshold value and the temperature difference is equal to or higher than a second threshold value, And a determination step of determining that a bonding failure due to reactive current has occurred in the bonded portion.
- a method for determining the welding of a strip-shaped plate body is provided.
- the welding determination apparatus 1 in this embodiment is an apparatus which determines the joining defect in the junction part of the steel strip 2 which is a strip
- the steel strip 2 is introduced after the preceding material 21 and the preceding material 21 which is a steel strip previously introduced into a production line such as a pickling line. It consists of the following material 22 which is a steel strip.
- the leading end 21 and the trailing member 22 are continuously connected by welding and joining the tail end of the leading member 21 and the leading end of the trailing member 22 by the seam welding machine 3.
- One steel strip 2 is formed and subjected to treatment according to the purpose such as pickling.
- the seam welder 3 includes a frame 31, a pair of electrode wheels 32 a and 32 b, a pair of swaging rolls 33 a and 33 b, two pressure cylinders 34 and 35, and a plurality of wheels 36.
- the frame body 31 has a U-shaped shape with a right angle in the front view shown in FIG. 1, and the U-shaped groove is in the x-axis direction (the horizontal direction with respect to the paper surface of FIG. Direction).
- the pair of electrode wheels 32a and 32b are roll-shaped electrodes, and are located inside the U-shaped groove of the frame 31 in the z-axis direction (vertical direction relative to the plane of FIG. 1 and perpendicular to the ground). Are provided opposite to each other.
- the pair of electrode wheels 32a and 32b are respectively connected to a drive motor (not shown), and are configured to be rotatable in the roll-shaped circumferential direction on the xz plane in response to the drive force of the drive motor.
- the pair of electrode wheels 32a and 32b are connected to a power supply device (not shown).
- the electrode ring 32 a is disposed on the negative side of the z axis when the position of the steel strip 2 is 0 on the z axis, and is fixed to the frame body 31.
- the electrode wheel 32 b is disposed on the z-axis positive direction side and is fixed to the frame body 31 via the pressure cylinder 34.
- the electrode wheel 32b is configured to be movable in the z-axis direction by the pressure cylinder 34.
- the pair of swaging rolls 33a and 33b is a reduction roll, and is opposed to the z-axis direction inside the U-shaped groove of the frame body 31 on the x-axis negative direction side of the pair of electrode wheels 32a and 32b.
- the pair of swaging rolls 33a and 33b are disposed so as to be inclined with respect to the x-axis and the y-axis (directions perpendicular to the x-axis direction and the y-axis direction) as seen from the z-axis positive direction side. .
- the pair of swaging rolls 33a and 33b are respectively connected to a drive motor (not shown), and are configured to be rotatable in the circumferential direction of the roll shape by receiving the drive force of the drive motor.
- the swaging roll 33 a is disposed on the negative side of the z axis when the position of the steel strip 2 is 0 on the z axis, and is fixed to the frame body 31.
- the swaging roll 33 b is disposed on the positive side of the z axis when the position of the steel strip 2 is 0 on the z axis, and is fixed to the frame body 31 via the pressure cylinder 35. Further, the swaging roll 33b is configured to be movable in the z-axis direction by the pressure cylinder 35.
- the plurality of wheels 36 are provided on the bottom surface of the frame body 31 on the negative z-axis direction side by side in the x-axis direction and the y-axis direction so that the frame body 31 can move in the x-axis direction.
- the seam welder 3 has a traveling motor (not shown), and the frame 31 is configured to be movable in the x-axis direction by receiving the driving force of the traveling motor.
- the steel strip 2 is welded by the following operation.
- the tail end portion of the leading member 21 and the tip end portion of the following member 22 are made by a side guide (not shown) for adjusting the position in the width direction of the steel strip 2 or a clamp device (not shown) for holding the steel strip 2.
- the position is adjusted to be the joining position.
- the joining position means that the center positions of the leading material 21 and the trailing material 22 in the width direction (x-axis direction) are combined, and the tail end of the leading material 21 and the leading end of the trailing material 22 are combined.
- a predetermined overlap allowance for example, a length of about 1.6 mm to 3.8 mm in the y-axis direction).
- the joint part of the steel strip 2 which becomes the location where the tail end part of the preceding material 21 and the tip part of the succeeding material 22 are overlapped is reduced and welded by the pair of electrode wheels 32a and 32b.
- the preceding material 21 and the following material 22 are joined.
- a junction part of the steel strip 2 was made into a pair.
- the joining portion is continuously joined.
- welding with a pair of electrode wheel 32a, 32b is performed by the fixed electric current value preset by the material, plate
- FIG. In the present embodiment, the current value of the reduction force and the welding current by the pair of electrode wheels 32a and 32b is higher than that of general seam welding.
- the steel strip 2 is a medium carbon steel having a plate thickness of 2 mm and a C content of about 0.30 mass% to 0.45 mass%
- a rolling force of about 20.6 kN While welding is performed with a current value of about 17.5 kA, in this embodiment, welding is performed with a rolling force of about 30.0 kN and a current value of about 40.0 kA.
- the joint portion where the welding by the pair of electrode wheels 32a and 32b is performed is reduced by the pair of swaging rolls 33a and 33b.
- the joint immediately after welding moves to the position of the pair of swaging rolls 33a and 33b by the travel of the frame 31, and is reduced by the pair of swaging rolls 33a and 33b.
- pressure and pressure are contacted.
- the pair of swaging rolls 33a and 33b are arranged so as to cross each other, the joined portion after the reduction is in a substantially flat state.
- the reduction by the pair of swaging rolls 33a and 33b is continuously performed over the entire width of the steel strip 2 in the x-axis direction, similarly to the reduction by the pair of electrode wheels 32a and 32b.
- the joint portion of the steel strip 2 is pressed and welded by the pair of electrode wheels 32a and 32b, so that the joint portion is joined and the level difference of the joint portion is lower than before the reduction. Get smaller. And after joining by a pair of electrode wheel 32a, 32b, the shape of a junction part is planarized because a junction part of steel strip 2 is crushed by a pair of swaging rolls 33a, 33b.
- the welding determination device 1 includes a measurement unit 11, a storage unit 12, and a determination unit 13.
- the measuring unit 11 is a temperature measuring device such as a radiation thermometer, and measures the temperature of the joint of the steel strip 2 immediately after welding.
- the measurement unit 11 is fixed to the frame of the seam welding machine 3 and is disposed at a position where the surface temperature of the joint immediately after welding by the pair of electrode wheels 32a and 32b can be measured.
- the measuring unit 11 is provided inside a U-shaped groove of the frame body 31 between the electrode wheel 32 a and the swaging roll 33 a.
- the measurement unit 11 continuously measures the surface temperature of the joint immediately after welding by the pair of electrode wheels 32a and 32b while seam welding is performed, and outputs the measurement result to the storage unit 12 together with the measurement time. .
- the storage unit 12 stores the measurement result acquired from the measurement unit 11 as measurement data together with the measurement time, and outputs the measurement data to the determination unit 13.
- the determination unit 13 determines whether or not a bonding failure has occurred at the bonded portion of the steel strip 2 based on the measurement data acquired from the storage unit 12. Details of the welding determination method by the determination unit 13 will be described later.
- the storage unit 12 and the determination unit 13 are computers including an input device, an output device, a central processing unit (CPU), a main storage device (internal storage device), an auxiliary storage device (external storage device), and the like.
- the device functions as the storage unit 12 and the central processing unit functions as the determination unit 13.
- the measurement part 11 measures the surface temperature of the junction part of the steel strip 2 (S100).
- the measurement of the surface temperature in step S100 is performed in parallel with welding and reduction of the joint by the pair of electrode wheels 32a and 32b and the pair of swaging rolls 33a and 33b.
- the measurement part 11 measures the surface temperature of the junction part immediately after welding by a pair of electrode wheel 32a, 32b and before reduction by a pair of swaging rolls 33a, 33b.
- the temperature measurement result by the measurement unit 11 is output to the storage unit 12 and stored in the storage unit 12 as measurement data.
- the determination unit 13 calculates the average temperature T ave and the temperature difference ⁇ T in the welded part based on the measurement data stored in the storage unit 12 (S102).
- the measurement data is temperature data corresponding to the measurement time, and is shown as a temperature chart as shown in FIG.
- the measurement data of the determination range is extracted from the acquired measurement data prior to the calculation of the average temperature T ave and the temperature difference ⁇ T.
- the determination range is a measurement time corresponding to the plate width of the steel strip 2, and is a time during which a joint portion of the welded steel strip 2 is measured.
- the time from the start of energization of the pair of electrode wheels 32a, 32b to the timing at which the welded portion moves in the width direction from the end of energization to the timing at which the welded portion moves in the width direction from the end of energization is determined. It becomes a range.
- the constant distance is a distance from the contact point of the pair of electrode wheels 32a and 32b to the measurement point of the measurement unit 11.
- the determination unit 13 determines, based on the measurement data in the determination range, the average temperature T ave in the determination range corresponding to the joint and the maximum and minimum values of the temperature in the determination range.
- a temperature difference ⁇ T which is a difference, is calculated.
- the average temperature T ave is calculated as an average value of a plurality of temperature data in the measurement data in the determination range
- the temperature difference ⁇ T is a maximum value and a minimum value of the plurality of temperature data in the measurement data in the determination range. Is calculated as the difference between
- the determination unit 13 determines whether or not the average temperature T ave calculated in step S102 is less than or equal to the first threshold and the temperature difference ⁇ T is greater than or equal to the second threshold (S104).
- the second threshold S104
- the determination unit 13 determines whether or not the average temperature T ave calculated in step S102 is less than or equal to the first threshold and the temperature difference ⁇ T is greater than or equal to the second threshold (S104).
- seam welding such as welding while rolling down the steel strip 2 with a pair of electrode wheels 32a, 32b
- the surfaces of the pair of electrode wheels 32a and 32b may be unevenly worn in steps.
- the step d on the surface of the pair of electrode wheels 32a and 32b due to uneven wear is smaller than the plate thickness of the steel strip 2, as shown in FIG. Will flow, so that the welding of the joint is performed correctly.
- the first threshold value is set as a value that can detect an increase in average temperature T ave due to the occurrence of dust from the temperature data when dust occurs. Furthermore, the rise in average temperature T ave due to dust tends to increase as the thickness of the steel strip 2 increases. For this reason, the first threshold value may be set according to the plate thickness of the steel strip 2.
- the second threshold value is set according to the material of the steel strip 2, the current value, and the like as a value capable of detecting a temperature drop from the initial stage to the final stage of welding in the temperature chart that occurs when a reactive current is generated.
- step S104 when the average temperature T ave is equal to or lower than the first threshold value and the temperature difference ⁇ T is equal to or higher than the second threshold value, the determination unit 13 causes a bonding failure due to reactive current in the welded portion of the steel strip 2. (S106). After step S106, the determination unit 13 outputs a determination result to a control unit (not shown) that controls the production line provided with the seam welder 3, and stops the production line (S108). As a result, it is possible to prevent breakage of the joint that has become defective due to the reactive current, and it is possible to suppress a reduction in operating rate and cost for recovery compared to when the production line is stopped due to breakage.
- the determination unit 13 determines that the welding failure of the steel strip 2 is caused by a bonding failure due to reactive current. It determines with having not generate
- the method is applied when welding the steel strip 2 in the pickling line, but the present invention is not limited to such an example.
- the present invention can be applied to a production line for a strip-shaped plate body made of not only a steel strip but also other metals.
- the belt-like plate body is the steel strip 2
- it can be applied not only to the pickling line but also to the steel strip 2 line where other treatments such as cold rolling and rust prevention are performed.
- the strip plate body welding determination apparatus 1 includes a measurement unit 11 that measures the temperature of a joint portion of a strip plate body (for example, a steel strip 2) joined by seam welding, and a measurement. Based on the measurement result of the part 11, an average temperature T ave at the joint and a temperature difference ⁇ T which is a difference between the maximum value and the minimum value of the temperature at the joint are calculated, and the average temperature T ave is equal to or less than the first threshold value. And when the temperature difference ⁇ T is equal to or greater than the second threshold value, the determination unit 13 determines that a bonding failure due to the reactive current has occurred in the bonding portion.
- a measurement unit 11 that measures the temperature of a joint portion of a strip plate body (for example, a steel strip 2) joined by seam welding, and a measurement. Based on the measurement result of the part 11, an average temperature T ave at the joint and a temperature difference ⁇ T which is a difference between the maximum value and the minimum value of the temperature at the joint are calculated, and the average temperature
- a method for determining welding of a strip-shaped plate body includes a measurement step (step S100) for measuring the temperature of a joint portion of the strip-shaped plate body joined by seam welding, and a measurement result at the measurement step. Based on the calculation step (step S102) for calculating the average temperature T ave at the junction and the temperature difference ⁇ T which is the difference between the maximum value and the minimum value of the temperature at the junction, the average temperature T ave is the first A determination step (step S104) for determining that a bonding failure due to the reactive current has occurred in the bonded portion when the temperature difference ⁇ T is equal to or smaller than the threshold value and equal to or larger than the second threshold value.
- the second threshold value is used for determination in order to detect an increase in the temperature difference ⁇ T due to the reactive current that increases toward the end of welding. For this reason, in the seam welding, it is possible to determine when the welding is normally performed and when the bonding is defective due to the reactive current.
- the first threshold value by performing the determination of the average temperature T ave using the first threshold value, it is possible to detect the occurrence of a bonding failure in distinction from the bonding failure caused by other factors such as dust. For example, when dust occurs, as shown in FIG. 9, the temperature chart tends to have a large temperature difference ⁇ T due to hunting. Therefore, only the bonding failure due to the reactive current can be detected only in the temperature difference ⁇ T. difficult.
- a determination is made even with the average temperature T ave in addition to the temperature difference ⁇ T. It can be distinguished and determined.
- the average temperature T ave was 800 ° C. or lower when a bonding failure due to reactive current occurred.
- the temperature chart descends to the right as shown in FIG. 5, and it was confirmed that the temperature difference ⁇ T increases.
- production of the joining defect by a reactive current can be detected by setting the 2nd threshold value with respect to temperature difference (DELTA) T to 125 degreeC. confirmed.
- the temperature difference ⁇ T is less than 125 ° C.
- the second threshold value for the temperature difference ⁇ T is set to 155 ° C., so that only the occurrence of bonding failure due to reactive current can be accurately determined. confirmed. Furthermore, when the thicker plate thickness is greater than 1.8 mm and less than or equal to 2.1 mm, the second threshold value for the temperature difference ⁇ T is set to 167 ° C., so that only the occurrence of bonding failure due to reactive current can be accurately determined. confirmed. When the thicker plate thickness exceeds 2.1 mm, no reactive current is generated.
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Abstract
Description
これに対して、例えば、特許文献1には、帯状板体である鋼帯の溶接判定方法として、溶接直後の溶接部の温度を測定し、測定した温度と鋼帯の重ね厚に応じた閾値とから、接合不良を判定する方法が開示されている。
そこで、本発明は、上記の課題に着目してなされたものであり、シーム溶接において無効電流に起因した接合不良の発生を判定することができる帯状板体の溶接判定装置及び溶接判定方法を提供することを目的としている。
はじめに、図1~図3を参照して、本発明の一実施形態に係る溶接判定装置1の構成について説明する。本実施形態における溶接判定装置1は、帯状板体である鋼帯2の接合部における接合不良を判定する装置である。本実施形態では、鋼帯2は、図1及び図2に示すように、酸洗ラインなどの生産ラインに先に投入された鋼帯である先行材21と、先行材21の後に投入された鋼帯である後行材22とからなる。このような生産ラインでは、先行材21の尾端部と、後行材22の先端部とがシーム溶接機3によって溶接され、接合されることで、先行材21と後行材22とが連続した1つの鋼帯2となり、酸洗などの目的に応じた処理が施される。
枠体31は、図1に示す正面視において角が直角なU字状の形状を有し、U字状の溝がx軸方向(図1の紙面に対する左右方向であり、地面に平行な水平方向)に平行に延在して配される。
また、シーム溶接機3は、不図示の走行用モータを有し、この走行用モータの駆動力を受けて、枠体31がx軸方向に移動可能に構成される。
まず、鋼帯2の幅方向の位置を調整するサイドガイド(不図示)や鋼帯2を保持するクランプ装置(不図示)などによって、先行材21の尾端部及び後行材22の先端部の位置が接合位置となるように調整される。接合位置とは、図1及び図2に示すように、先行材21及び後行材22の幅方向(x軸方向)の中心位置が合わさり、先行材21の尾端と後行材22の先端とが所定の重ね代(例えば、y軸方向に1.6mm~3.8mm程度の長さ)で重ね合わされた状態となる位置である。
測定部11は、放射温度計などの測温装置であり、溶接直後の鋼帯2の接合部の温度を測定する。測定部11は、シーム溶接機3の枠体に固定され、一対の電極輪32a,32bによる溶接直後の接合部の表面温度が測定可能な位置に配される。本実施形態では、測定部11は、図1に示すように、電極輪32aとスウェージングロール33aとの間となる、枠体31のU字状の溝の内側に設けられる。測定部11は、一対の電極輪32a,32bによる溶接直後の接合部の表面温度を、シーム溶接が行われている間、連続的に測定し、測定結果を測定時間とともに記憶部12に出力する。
判定部13は、記憶部12から取得した測定データに基づいて、鋼帯2の接合部にて接合不良が発生したか否かを判定する。判定部13による、溶接判定方法についての詳細は、後述する。
記憶部12及び判定部13は、入力装置、出力装置、中央処理装置(CPU)、主記憶装置(内部記憶装置)、補助記憶装置(外部記憶装置)などから構成されるコンピュータであり、主記憶装置が記憶部12、中央処理装置が判定部13として機能する。
次に、図4~図9を参照して本実施形態に係る帯状板体の溶接判定方法について説明する。図4に示すように、まず、測定部11は、鋼帯2の接合部の表面温度を測定する(S100)。ステップS100における表面温度の測定は、一対の電極輪32a,32b及び一対のスウェージングロール33a,33bによる、接合部の溶接及び圧下と並行して行われる。また、測定部11は、一対の電極輪32a,32bによって溶接された直後、且つ一対のスウェージングロール33a,33bによる圧下前の接合部の表面温度を測定する。測定部11による温度の測定結果は、記憶部12へと出力され、測定データとして記憶部12に記憶される。
ここで、一対の電極輪32a,32bで鋼帯2を圧下しながら溶接するようなシーム溶接の場合、稼動時間や圧下量、鋼帯2の材質などの条件によって、図6に示すように、一対の電極輪32a,32bの表面が段差状に偏摩耗することがある。偏摩耗による一対の電極輪32a,32bの表面の段差dが鋼帯2の板厚よりも小さい場合、シーム溶接の初期には、図7に示すように、鋼帯2の接合部にのみ電流が流れるため、接合部の溶接が正しく行われる。しかし、シーム溶接では、一対の電極輪32a,32bによる加圧が一定圧力で実施されるため、材料変形により接合部の重ね合せ代が小さくなる溶接末期に近づくに従い、接合部の板厚方向の厚みが薄くなる。この際、図8に示すように、後行材22及び先行材21が、一対の電極輪32a,32bの摩耗していない部分に接触し易くなり、接合部以外の経路で流れる無効電流が生じる。無効電流は接合部の溶接に寄与しないものであるため、無効電流の増加に伴い、接合部では溶接が十分に行われなくなり、接合部における表面温度も低下することとなる。つまり、一対の電極輪32a,32bの偏摩耗により無効電流が生じる場合には、図5に示すように、時間経過に伴い接合部の温度が低くなるような、右肩下がりの温度チャートとなる。このような無効電流は、溶接末期における接合部の厚み及び鋼帯2の板厚と、段差dとの関係から、段差dの大きさが鋼帯2の板厚と同じくらいになると発生し易くなる。
そして、ステップS106の後、判定部13は、シーム溶接機3が設けられた生産ラインを制御する不図示の制御部に判定結果を出力し、生産ラインを停止させる(S108)。これにより、無効電流によって接合不良となった接合部の破断を防止することができ、破断によって生産ラインが停止した場合に比べ稼動率の低下や復旧に掛かるコストを抑制することができる。
以上の、ステップS100~S110の工程を経ることで、本実施形態における溶接部の判定が終了する。
以上で、特定の実施形態を参照して本発明を説明したが、これら説明によって発明を限定することを意図するものではない。本発明の説明を参照することにより、当業者には、開示された実施形態の種々の変形例とともに本発明の別の実施形態も明らかである。従って、特許請求の範囲は、本発明の範囲及び要旨に含まれるこれらの変形例または実施形態も網羅すると解すべきである。
(1)本発明の一態様に係る帯状板体の溶接判定装置1は、シーム溶接により接合される帯状板体(例えば、鋼帯2)の接合部の温度を測定する測定部11と、測定部11の測定結果に基づいて、接合部における平均温度Tave、及び接合部における温度の最大値と最小値との差である温度差ΔTを算出し、平均温度Taveが第1の閾値以下で、且つ温度差ΔTが第2の閾値以上である場合に、接合部にて無効電流による接合不良が発生したことを判定する判定部13とを備える。
また、チリが発生した場合では、温度差ΔTが110℃以上となり、平均温度Taveは800℃超となることを確認した。つまり、上記実施形態において、第1の閾値を800℃、第2の閾値を125℃とすることで、無効電流による接合不良の発生のみを精度よく判定できることが確認された。
11 測定部
12 記憶部
13 判定部
2 鋼帯
21 先行材
22 後行材
3 シーム溶接機
31 枠体
32a,32b 電極輪
33a,33b スウェージングロール
34,35 加圧シリンダー
36 車輪
Claims (2)
- シーム溶接により接合される帯状板体の接合部の温度を測定する測定部と、
前記測定部の測定結果に基づいて、前記接合部における平均温度、及び前記接合部における温度の最大値と最小値との差である温度差を算出し、前記平均温度が第1の閾値以下で、且つ前記温度差が第2の閾値以上である場合に、前記接合部にて無効電流による接合不良が発生したことを判定する判定部と
を備えることを特徴とする帯状板体の溶接判定装置。 - シーム溶接により接合される帯状板体の接合部の温度を測定する測定ステップと、
前記測定ステップでの測定結果に基づいて、前記接合部における平均温度、及び前記接合部における温度の最大値と最小値との差である温度差を算出する算出ステップと、
前記平均温度が第1の閾値以下で、且つ前記温度差が第2の閾値以上である場合に、前記接合部にて無効電流による接合不良が発生したことを判定する判定ステップと
を備えることを特徴とする帯状板体の溶接判定方法。
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KR1020197028010A KR20190124252A (ko) | 2017-03-31 | 2018-03-27 | 띠 형상 판체의 용접 판정 장치 및 용접 판정 방법 |
JP2018545238A JP6483932B2 (ja) | 2017-03-31 | 2018-03-27 | 帯状板体の溶接判定装置および溶接判定方法 |
EP18775620.0A EP3603868A4 (en) | 2017-03-31 | 2018-03-27 | WELDING DETERMINATION DEVICE FOR TAPE SHEETS AND WELDING DETERMINATION METHOD |
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JP2021178346A (ja) * | 2020-05-13 | 2021-11-18 | Jfeスチール株式会社 | 溶接部の良否判定方法及び良否判定装置 |
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