JP2018164928A - Welding quality determination method and device in lap seam welding - Google Patents
Welding quality determination method and device in lap seam welding Download PDFInfo
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Abstract
Description
この発明は、ラップシーム溶接の溶接良否判定方法および装置に係り、特に、金属帯の重ね合わせ部を一対の電極輪により加圧しながらラップシーム溶接する際の溶接状態の良否を判定する方法および装置に関する。 The present invention relates to a welding quality determination method and apparatus for lap seam welding, and in particular, a method and apparatus for determining the quality of a welding state when lap seam welding is performed while pressing an overlapping portion of a metal band with a pair of electrode wheels. About.
従来、例えば、連続焼鈍ライン、連続めっきライン、連続塗装ライン、巻き直しラインなどの連続ラインにおいては、鋼帯などの金属帯を連続して処理するために、先行材となる金属帯の後端部と後行材となる金属帯の先端部との重ね合わせ部を溶接することが行なわれている。
溶接方法としては、金属帯の重ね合わせ部を一対の電極輪で挟んで加圧し、一対の電極輪に通電した状態で、これらの電極輪を金属帯の幅方向に移動させて溶接を行なう、いわゆる、ラップシーム溶接が主に採用されている。
Conventionally, for example, in a continuous line such as a continuous annealing line, a continuous plating line, a continuous coating line, and a rewinding line, the rear end of the metal band that is the preceding material in order to continuously process the metal band such as a steel strip. Welding is performed on the overlapping portion of the portion and the leading end portion of the metal band to be the following material.
As a welding method, the metal band overlapped portion is pressed between a pair of electrode wheels, and in a state where the pair of electrode wheels is energized, welding is performed by moving these electrode wheels in the width direction of the metal band. So-called lap seam welding is mainly employed.
このラップシーム溶接において、何らかの要因で溶接不良が発生し、溶接箇所が連続ライン内で破断した場合、長時間に亘って操業停止となるおそれがある。溶接時に溶接状態を判定することができれば、任意のタイミングで連続ラインを停止することが可能となり、操業停止期間を最小限に抑えることができる。
そこで、例えば、特許文献1には、電極輪付近の溶接後の温度および電極輪間の電圧を測定し、これらの測定値がそれぞれ予め定めた範囲内にあるときに、溶接状態が正常であると判定する、ラップシーム溶接の良否判定方法が開示されている。
In this lap seam welding, if a welding failure occurs for some reason and the welded part breaks in the continuous line, there is a possibility that the operation is stopped for a long time. If the welding state can be determined at the time of welding, the continuous line can be stopped at an arbitrary timing, and the operation stop period can be minimized.
Therefore, for example, in Patent Document 1, the temperature after welding near the electrode ring and the voltage between the electrode rings are measured, and when these measured values are within a predetermined range, the welding state is normal. Is determined as a quality determination method for lap seam welding.
しかしながら、電極輪付近の溶接後の温度は、周囲の環境温度の影響および溶接が行われている箇所からの入熱の影響を受けるため、温度の測定値が同じであっても溶接状態が異なる場合がある。従って、電極輪付近の溶接後の温度の測定値が予め定めた範囲内にあっても、溶接状態が良好ではないことがある。 However, the temperature after welding in the vicinity of the electrode ring is affected by the ambient temperature and the heat input from the place where the welding is performed, so the welding state is different even if the measured temperature value is the same. There is a case. Therefore, even if the measured value of the temperature after welding in the vicinity of the electrode ring is within a predetermined range, the welding state may not be good.
また、特に、薄い金属帯を重ね合わせて溶接する際には、形状不良などが原因で金属帯にシワが発生することがある。このシワが金属帯の重ね合わせ部に位置すると、重ね合わせ部における2枚の金属帯間の接触状態が局部的に悪くなって、一対の電極輪により挟まれる重ね合わせ部の表面と裏面の間の電気抵抗値が高くなり、電極輪付近の溶接後の温度および電極輪間の電圧が急激に変化する場合がある。しかしながら、これらの温度および電圧の変化は局部的であるため、温度および電圧の測定値がそれぞれ予め定めた範囲内にあれば、溶接状態が異常であると判定されることはなく、誤判定となるおそれがある。 In particular, when thin metal bands are overlapped and welded, wrinkles may occur in the metal bands due to shape defects or the like. When this wrinkle is located at the overlapping portion of the metal band, the contact state between the two metal bands at the overlapping portion is locally deteriorated, and between the front and back surfaces of the overlapping portion sandwiched between the pair of electrode rings. In some cases, the electric resistance value of the electrode ring becomes high, and the temperature after welding near the electrode ring and the voltage between the electrode rings change rapidly. However, since these temperature and voltage changes are local, if the measured values of temperature and voltage are within predetermined ranges, the welding state is not determined to be abnormal, There is a risk.
この発明は、このような従来の問題点を解消するためになされたもので、ラップシーム溶接における溶接状態の良否を正確に判定することができるラップシーム溶接の溶接良否判定方法および装置を提供することを目的とする。 The present invention has been made to solve the above-described conventional problems, and provides a welding quality determination method and apparatus for lap seam welding that can accurately determine the quality of a welding state in lap seam welding. For the purpose.
この発明に係るラップシーム溶接の溶接良否判定方法は、金属帯の重ね合わせ部を一対の電極輪で挟んで加圧し、一対の電極輪に通電した状態で一対の電極輪を重ね合わせ部に対して相対移動させることにより重ね合わせ部を溶接するラップシーム溶接の溶接良否判定方法であって、溶接時における重ね合わせ部の溶接箇所またはその近傍の表面温度と一対の電極輪間の電圧と一対の電極輪による加圧力をそれぞれ測定し、表面温度の測定値から算出される表面温度の変化率が予め定められた温度変化率しきい値範囲外である場合、または、電圧の測定値から算出される電圧の変化率が予め定められた電圧変化率しきい値範囲外である場合、または、加圧力の測定値から算出される加圧力の変化率が予め定められた加圧力変化率しきい値範囲外である場合に、溶接不良と判定する方法である。 In the method for determining whether or not the lap seam is welded according to the present invention, the overlapping portion of the metal band is pressed between the pair of electrode wheels, and the pair of electrode wheels are applied to the overlapping portion while the pair of electrode wheels are energized. A welding quality determination method for lap seam welding in which the overlapping portion is welded by relatively moving the surface, the surface temperature of the overlapping portion at the time of welding or the vicinity thereof, the voltage between the pair of electrode rings, and a pair of Measure the pressure applied by the electrode wheel, and if the rate of change of the surface temperature calculated from the measured value of the surface temperature is outside the predetermined temperature change rate threshold range or calculated from the measured value of the voltage When the voltage change rate is outside the predetermined voltage change rate threshold range, or the pressure change rate calculated from the measured value of the applied pressure is a predetermined pressure change rate threshold value. range If it is, a method of determining a defective weld.
また、表面温度の変化率が温度変化率しきい値範囲内であり、電圧の変化率が電圧変化率しきい値範囲内であり、加圧力の変化率が加圧力変化率しきい値範囲内であっても、表面温度の測定値が予め定められた温度しきい値範囲外である場合、または、電圧の測定値が予め定められた電圧しきい値範囲外である場合、または、加圧力の測定値が予め定められた加圧力しきい値範囲外である場合に、溶接不良と判定することが好ましい。 The rate of change of the surface temperature is within the temperature change rate threshold range, the rate of change of the voltage is within the voltage change rate threshold range, and the rate of change of the applied pressure is within the applied pressure change rate threshold range. Even if the measured value of the surface temperature is out of the predetermined temperature threshold range, or the measured value of the voltage is out of the predetermined voltage threshold range, or the pressurizing force When the measured value is outside the predetermined pressure threshold range, it is preferable to determine that the welding is defective.
この発明に係るラップシーム溶接の溶接良否判定装置は、金属帯の重ね合わせ部を一対の電極輪で挟んで加圧し、一対の電極輪に通電した状態で一対の電極輪を重ね合わせ部に対して相対移動させることにより重ね合わせ部を溶接するラップシーム溶接の溶接良否判定装置であって、溶接時における重ね合わせ部の溶接箇所またはその近傍の表面温度を測定する温度センサと、溶接時における一対の電極輪間の電圧を測定する電圧計と、溶接時における一対の電極輪による加圧力を測定する加圧力センサと、温度センサによる表面温度の測定値から算出される表面温度の変化率が予め定められた温度変化率しきい値範囲外である場合、または、電圧計による電圧の測定値から算出される電圧の変化率が予め定められた電圧変化率しきい値範囲外である場合、または、加圧力センサによる加圧力の測定値から算出される加圧力の変化率が予め定められた加圧力変化率しきい値範囲外である場合に、溶接不良と判定する溶接良否判定部とを備えたものである。 A welding quality determination device for lap seam welding according to the present invention presses a metal band overlapping portion sandwiched between a pair of electrode wheels and energizes the pair of electrode wheels with respect to the overlapping portion. A weld quality determination device for lap seam welding that welds the overlapped portion by relative movement and a pair of a temperature sensor that measures the surface temperature at or near the welded portion of the overlapped portion at the time of welding, and a pair at the time of welding The rate of change of the surface temperature calculated from the measured value of the surface temperature by the temperature sensor, the voltmeter for measuring the voltage between the electrode wheels, the pressure sensor for measuring the pressure applied by the pair of electrode wheels during welding When the temperature change rate is outside the predetermined threshold range, or the voltage change rate calculated from the voltage measured by the voltmeter is a predetermined voltage change rate threshold range. , Or when the rate of change in the force calculated from the measured value of the force applied by the force sensor is outside the predetermined pressure change rate threshold range And a determination unit.
また、溶接良否判定部は、表面温度の変化率が温度変化率しきい値範囲内であり、電圧の変化率が電圧変化率しきい値範囲内であり、加圧力の変化率が加圧力変化率しきい値範囲内であっても、温度センサによる表面温度の測定値が予め定められた温度しきい値範囲外である場合、または、電圧計による電圧の測定値が予め定められた電圧しきい値範囲外である場合、または、加圧力センサによる加圧力の測定値が予め定められた加圧力しきい値範囲外である場合に、溶接不良と判定することが好ましい。 In addition, the welding pass / fail judgment unit determines that the rate of change in surface temperature is within the temperature change rate threshold range, the rate of change in voltage is within the voltage change rate threshold range, and the rate of change in applied pressure is the change in applied pressure. Even if it is within the rate threshold range, the measured value of the surface temperature by the temperature sensor is outside the predetermined temperature threshold range, or the measured value of the voltage by the voltmeter is a predetermined voltage. It is preferable to determine that the welding is defective when it is outside the threshold value range or when the measured value of the applied pressure by the applied pressure sensor is outside the predetermined applied pressure threshold range.
この発明によれば、重ね合わせ部の溶接箇所またはその近傍の表面温度の測定値から算出される表面温度の変化率が予め定められた温度変化率しきい値範囲外である場合、または、一対の電極輪間の電圧の測定値から算出される電圧の変化率が予め定められた電圧変化率しきい値範囲外である場合、または、一対の電極輪による加圧力の測定値から算出される加圧力の変化率が予め定められた加圧力変化率しきい値範囲外である場合に、溶接不良と判定するので、ラップシーム溶接における溶接状態の良否を正確に判定することが可能となる。 According to the present invention, when the rate of change of the surface temperature calculated from the measured value of the surface temperature at or near the welded portion of the overlapping portion is outside the predetermined temperature change rate threshold range, When the voltage change rate calculated from the measured value of the voltage between the electrode wheels is outside the predetermined voltage change rate threshold range, or calculated from the measured pressure value of the pair of electrode wheels Since the welding failure is determined when the change rate of the applied pressure is outside the predetermined applied pressure change rate threshold range, it is possible to accurately determine the quality of the welding state in the lap seam welding.
以下、この発明の実施の形態を添付図面に基づいて説明する。
実施の形態1
図1を参照して、連続ライン内における鋼帯のラップシーム溶接について説明する。先行材となる金属帯1の後端部1Aと、連続ラインの進行方向D1に対して金属帯1よりも下流側に位置する、後行材としての金属帯2の先端部2Aとが重ね合わされて、重ね合わせ部3が形成されている。
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1
With reference to FIG. 1, the lap seam welding of the steel strip in a continuous line is demonstrated. The rear end portion 1A of the metal band 1 as the preceding material and the front end portion 2A of the metal band 2 as the succeeding material, which are located downstream of the metal band 1 with respect to the traveling direction D1 of the continuous line, are overlapped. Thus, the overlapping portion 3 is formed.
重ね合わせ部3の表面上に電極輪4が配置されると共に、重ね合わせ部3の裏面上に電極輪5が配置され、これら一対の電極輪4および5により重ね合わせ部3が上下から挟まれている。電極輪4および5は、互いに同じ形状およびサイズを有し、それぞれ、連続ラインの進行方向D1に沿った回転軸の回りに回転可能に保持されている。
このような一対の電極輪4および5で重ね合わせ部3を挟んで加圧し、電極輪4および5に通電した状態で、これらの電極輪4および5を、金属帯1、2の幅方向D2に沿った走行方向D3に向かって走行させることにより、重ね合わせ部3がラップシーム溶接される。
The electrode ring 4 is disposed on the surface of the overlapping portion 3 and the electrode wheel 5 is disposed on the back surface of the overlapping portion 3, and the overlapping portion 3 is sandwiched from above and below by the pair of electrode wheels 4 and 5. ing. The electrode wheels 4 and 5 have the same shape and size as each other, and are held so as to be rotatable around a rotation axis along the traveling direction D1 of the continuous line.
In such a state that the electrode ring 4 and 5 are energized while the electrode ring 4 and 5 are energized by pressing the overlapping portion 3 between the pair of electrode wheels 4 and 5, the width direction D 2 of the metal bands 1 and 2 is set. The lap seam welding is performed on the overlapping portion 3 by traveling in the traveling direction D3 along the direction.
図2に、実施の形態1に係るラップシーム溶接の溶接良否判定装置20を備えたラップシーム溶接機の構成を示す。
キャリッジフレーム6の上側腕部7と下側腕部8が、金属帯幅方向D2に沿って延びており、上側腕部7の下部に加圧装置9を介して取り付けられた電極輪保持部材10に電極輪4が回転可能に保持され、下側腕部8の上部に固定された電極輪保持部材11に電極輪5が回転可能に保持されている。加圧装置9は、例えば圧縮エアを利用して電極輪保持部材10を下方に押すことにより、一対の電極輪4および5の間で金属帯1、2の重ね合わせ部3を加圧するためのものである。
FIG. 2 shows the configuration of a lap seam welder provided with a welding quality determination device 20 for lap seam welding according to the first embodiment.
An upper arm portion 7 and a lower arm portion 8 of the carriage frame 6 extend along the metal band width direction D2 and are attached to the lower portion of the upper arm portion 7 via a pressurizing device 9. The electrode wheel 4 is rotatably held, and the electrode wheel 5 is rotatably held by an electrode wheel holding member 11 fixed to the upper part of the lower arm portion 8. The pressurizing device 9 is used to press the overlapping portion 3 of the metal bands 1 and 2 between the pair of electrode wheels 4 and 5 by, for example, pressing the electrode wheel holding member 10 downward using compressed air. Is.
また、一対の電極輪4および5に溶接電源12が接続されている。溶接電源12は、一対の電極輪4および5を介して金属帯1、2の重ね合わせ部3に一定の溶接電流を供給する定電流制御を行うための電源である。
キャリッジフレーム6は、移動装置13により、金属帯幅方向D2に延びるレール14に沿って移動可能に配置されている。
A welding power source 12 is connected to the pair of electrode wheels 4 and 5. The welding power source 12 is a power source for performing constant current control for supplying a constant welding current to the overlapping portion 3 of the metal bands 1 and 2 via the pair of electrode wheels 4 and 5.
The carriage frame 6 is arranged so as to be movable along the rail 14 extending in the metal band width direction D2 by the moving device 13.
さらに、電極輪4が保持されている電極輪保持部材10に、重ね合わせ部3の溶接箇所の表面温度を測定する温度センサ15が取り付けられている。温度センサ15としては、例えば、赤外線を利用して非接触式に温度測定を行う赤外線温度センサなどを用いることができ、溶接直後の表面温度を測定するために、電極輪4の走行方向D3に対して電極輪4の後方から、電極輪4と重ね合わせ部3の接触箇所に向くように温度センサ15が配置されている。 Furthermore, a temperature sensor 15 that measures the surface temperature of the welded portion of the overlapping portion 3 is attached to the electrode wheel holding member 10 that holds the electrode wheel 4. As the temperature sensor 15, for example, an infrared temperature sensor that performs temperature measurement in a non-contact manner using infrared rays can be used. In order to measure the surface temperature immediately after welding, the electrode wheel 4 is moved in the traveling direction D 3. On the other hand, a temperature sensor 15 is arranged from the rear of the electrode wheel 4 so as to face the contact point between the electrode wheel 4 and the overlapping portion 3.
また、溶接電源12に電圧計16が接続されている。この電圧計16は、溶接電源12からの電源供給により一対の電極輪4および5の間に生じる電圧、すなわち、重ね合わせ部3の表面と裏面の間に印加される溶接電圧を測定するためのものである。
加圧装置9には、一対の電極輪4および5による加圧力を測定するための加圧力センサ17が取り付けられている。加圧力センサ17は、例えば、圧縮エアの圧力を検出する圧力計から構成することができる。
A voltmeter 16 is connected to the welding power source 12. The voltmeter 16 is used to measure a voltage generated between the pair of electrode wheels 4 and 5 by the power supply from the welding power source 12, that is, a welding voltage applied between the front surface and the back surface of the overlapping portion 3. Is.
A pressure sensor 17 for measuring the pressure applied by the pair of electrode wheels 4 and 5 is attached to the pressure device 9. The pressurizing sensor 17 can be composed of, for example, a pressure gauge that detects the pressure of compressed air.
これらの温度センサ15と電圧計16と加圧力センサ17に溶接良否判定部18が接続されている。溶接良否判定部18は、温度センサ15により得られる重ね合わせ部3の溶接箇所の表面温度と、電圧計16により得られる一対の電極輪4および5間の溶接電圧と、加圧力センサ17により得られる一対の電極輪4および5による加圧力をそれぞれ監視することで、溶接箇所における溶接状態を推測し、溶接の良否を判定する。
温度センサ15と電圧計16と加圧力センサ17と溶接良否判定部18により、実施の形態1に係る溶接良否判定装置20が構成されている。
A welding quality determination unit 18 is connected to the temperature sensor 15, the voltmeter 16, and the pressure sensor 17. The welding pass / fail judgment unit 18 is obtained by the surface temperature of the welding portion of the overlapping portion 3 obtained by the temperature sensor 15, the welding voltage between the pair of electrode wheels 4 and 5 obtained by the voltmeter 16, and the pressure sensor 17. By monitoring the pressure applied by the pair of electrode wheels 4 and 5 respectively, the welding state at the welding location is estimated and the quality of the welding is determined.
The temperature sensor 15, the voltmeter 16, the pressure sensor 17, and the welding quality determination unit 18 constitute a welding quality determination device 20 according to the first embodiment.
金属帯1および2の溶接を行う際には、図1に示したように、先行材としての金属帯1の後端部1Aと後行材としての金属帯2の先端部2Aとが重ね合わされて重ね合わせ部3が形成され、金属帯1および2が、図示しない出側クランプ装置および入側クランプ装置によりそれぞれ締め付けられて、位置が固定される。
さらに、溶接電源12から一対の電極輪4および5に電源を供給すると共に、加圧装置9を駆動して一対の電極輪4および5により金属帯1および2の重ね合わせ部3を加圧しながら、移動装置13によりキャリッジフレーム6をレール14に沿って移動させて、一対の電極輪4および5を、金属帯幅方向D2に沿った走行方向D3に向かって一定速度で走行させることにより、重ね合わせ部3がラップシーム溶接される。
When welding the metal bands 1 and 2, as shown in FIG. 1, the rear end portion 1A of the metal band 1 as the preceding material and the front end portion 2A of the metal band 2 as the following material are overlapped. Thus, the overlapping portion 3 is formed, and the metal bands 1 and 2 are clamped by an unillustrated exit side clamp device and an entrance side clamp device, respectively, and their positions are fixed.
Further, power is supplied from the welding power source 12 to the pair of electrode wheels 4 and 5, and the pressurizing device 9 is driven to pressurize the overlapping portion 3 of the metal bands 1 and 2 with the pair of electrode wheels 4 and 5. By moving the carriage frame 6 along the rail 14 by the moving device 13 and causing the pair of electrode wheels 4 and 5 to travel at a constant speed in the traveling direction D3 along the metal band width direction D2, The mating portion 3 is lap seam welded.
ここで、溶接良否判定部18による溶接の良否判定を、図3のフローチャートを参照して説明する。
なお、溶接良否判定部18には、正常な溶接がなされる場合における、重ね合わせ部3の溶接箇所の表面温度の金属帯幅方向D2の位置的な変化率を表す温度変化率しきい値範囲と、一対の電極輪4および5間の溶接電圧の金属帯幅方向D2の位置的な変化率を表す電圧変化率しきい値範囲と、一対の電極輪4および5による加圧力の金属帯幅方向D2の位置的な変化率を表す加圧力変化率しきい値範囲とが、予め定められ、格納されているものとする。これらの温度変化率しきい値範囲、電圧変化率しきい値範囲および加圧力変化率しきい値範囲は、過去の実績に基づいて求めることができる。
一対の電極輪4および5は、走行方向D3に向かって一定速度で走行するため、溶接良否判定部18に予め定められている表面温度の金属帯幅方向D2の位置的な変化率、溶接電圧の金属帯幅方向D2の位置的な変化率および加圧力の金属帯幅方向D2の位置的な変化率は、それぞれ、表面温度の時間的変化率、溶接電圧の時間的変化率および加圧力の時間的変化率に相当している。
Here, the quality determination of welding by the quality determination part 18 of welding is demonstrated with reference to the flowchart of FIG.
Note that the welding pass / fail judgment unit 18 includes a temperature change rate threshold range that represents a positional change rate in the metal band width direction D2 of the surface temperature of the welded portion of the overlapping portion 3 when normal welding is performed. A voltage change rate threshold range representing a positional change rate of the welding voltage between the pair of electrode wheels 4 and 5 in the metal band width direction D2, and a metal band width of the pressure applied by the pair of electrode wheels 4 and 5 It is assumed that a pressure change rate threshold range indicating a positional change rate in the direction D2 is predetermined and stored. These temperature change rate threshold range, voltage change rate threshold range, and applied pressure change rate threshold range can be obtained based on past results.
Since the pair of electrode wheels 4 and 5 travels at a constant speed in the traveling direction D3, the positional change rate in the metal band width direction D2 of the surface temperature predetermined in the welding quality determination unit 18, the welding voltage The positional change rate in the metal band width direction D2 and the positional change rate in the metal band width direction D2 of the metal band width direction D2 are respectively the temporal change rate of the surface temperature, the temporal change rate of the welding voltage, and the applied pressure. It corresponds to the rate of change over time.
まず、ステップS1で、温度センサ15により重ね合わせ部3の溶接箇所の表面温度が測定され、電圧計16により一対の電極輪4および5間の溶接電圧が測定され、加圧力センサ17により一対の電極輪4および5による加圧力が測定される。 First, in step S <b> 1, the surface temperature of the welded portion of the overlapping portion 3 is measured by the temperature sensor 15, the welding voltage between the pair of electrode wheels 4 and 5 is measured by the voltmeter 16, and the pair of pressure sensors 17 The pressure applied by the electrode wheels 4 and 5 is measured.
続くステップS2において、温度センサ15による重ね合わせ部3の溶接箇所の表面温度の測定値から表面温度の金属帯幅方向D2の位置的な変化率が算出され、算出された表面温度の変化率が、予め定められている温度変化率しきい値範囲と比較される。
そして、算出された表面温度の変化率が、予め定められている温度変化率しきい値範囲内である場合には、ステップS3に進み、今度は、電圧計16による一対の電極輪4および5間の溶接電圧の測定値から溶接電圧の金属帯幅方向D2の位置的な変化率が算出され、算出された溶接電圧の変化率が、予め定められている電圧変化率しきい値範囲と比較される。
In the subsequent step S2, the positional change rate of the surface temperature in the metal band width direction D2 is calculated from the measured value of the surface temperature of the welded portion of the overlapping portion 3 by the temperature sensor 15, and the calculated change rate of the surface temperature is calculated. Are compared with a predetermined temperature change rate threshold range.
When the calculated change rate of the surface temperature is within a predetermined temperature change rate threshold range, the process proceeds to step S3, and this time, the pair of electrode wheels 4 and 5 by the voltmeter 16 is advanced. The positional change rate of the welding voltage in the metal band width direction D2 is calculated from the measured value of the welding voltage between the welding voltage, and the calculated change rate of the welding voltage is compared with a predetermined voltage change rate threshold range. Is done.
算出された溶接電圧の変化率が、予め定められている電圧変化率しきい値範囲内である場合には、ステップS4に進み、さらに、加圧力センサ17による加圧力の測定値から加圧力の金属帯幅方向D2の位置的な変化率が算出され、算出された加圧力の変化率が、予め定められている加圧力変化率しきい値範囲と比較される。
ステップS4において、算出された加圧力の変化率が、予め定められている加圧力変化率しきい値範囲内である場合には、溶接箇所の表面温度の変化率と、溶接電圧の変化率と、加圧力の変化率とが、いずれも予め定められている変化率しきい値範囲内であることから、ステップS5で、現在行われている溶接が良好であると判定される。
When the calculated change rate of the welding voltage is within a predetermined voltage change rate threshold range, the process proceeds to step S4, and from the measured value of the applied pressure by the applied pressure sensor 17, the applied pressure is calculated. The positional change rate in the metal band width direction D2 is calculated, and the calculated change rate of the applied pressure is compared with a predetermined applied pressure change rate threshold range.
In step S4, when the calculated change rate of the applied pressure is within a predetermined applied force change rate threshold range, the change rate of the surface temperature of the welded portion, the change rate of the welding voltage, Since the change rate of the applied pressure is within the predetermined change rate threshold range, it is determined in step S5 that the welding currently being performed is good.
一方、ステップS2における比較の結果、算出された表面温度の変化率が、予め定められている温度変化率しきい値範囲外である場合には、何らかの原因により異常が発生したと判断され、ステップS6で、現在行われている溶接は不良であると判定される。
同様に、ステップS3における比較の結果、算出された溶接電圧の変化率が、予め定められている電圧変化率しきい値範囲外である場合にも、何らかの原因により異常が発生したと判断され、ステップS6で、現在行われている溶接は不良であると判定される。
さらに、ステップS4における比較の結果、算出された加圧力の変化率が、予め定められている加圧力変化率しきい値範囲外である場合にも、何らかの原因により異常が発生したと判断され、ステップS6で、現在行われている溶接は不良であると判定される。
すなわち、溶接箇所の表面温度の変化率と、溶接電圧の変化率と、加圧力の変化率のうち、いずれか1つでも、予め定められている変化率しきい値範囲外であれば、溶接不良と判定される。
On the other hand, if the calculated change rate of the surface temperature is outside the predetermined temperature change rate threshold range as a result of the comparison in step S2, it is determined that an abnormality has occurred for some reason. In S6, it is determined that the current welding is defective.
Similarly, as a result of the comparison in step S3, even when the calculated change rate of the welding voltage is outside the predetermined voltage change rate threshold range, it is determined that an abnormality has occurred for some reason, In step S6, it is determined that the current welding is defective.
Further, as a result of the comparison in step S4, it is determined that an abnormality has occurred for some reason even when the calculated rate of change in the applied pressure is outside the predetermined pressure change rate threshold range, In step S6, it is determined that the current welding is defective.
That is, if any one of the rate of change of the surface temperature of the welded portion, the rate of change of the welding voltage, and the rate of change of the applied pressure is outside the predetermined change rate threshold range, welding is performed. It is determined to be defective.
図2に示したラップシーム溶接機を用いて実際にラップシーム溶接を行った際の、溶接箇所の表面温度と溶接電圧の測定例を図4に示す。図4において、横軸は、金属帯1および2の幅方向位置を示し、波形Wtは、測定された表面温度、波形Wvは、測定された溶接電圧を示している。また、図4には、正常な溶接がなされる場合における、溶接箇所の表面温度を表す温度しきい値範囲Rtmと溶接電圧を表す電圧しきい値範囲Rvmが併せて表示されている。これらの温度しきい値範囲Rtmおよび電圧しきい値範囲Rvmは、過去の実績に基づいて求めることができる。 FIG. 4 shows an example of measurement of the surface temperature and welding voltage of the welded part when lap seam welding is actually performed using the lap seam welder shown in FIG. In FIG. 4, the horizontal axis indicates the position in the width direction of the metal strips 1 and 2, the waveform Wt indicates the measured surface temperature, and the waveform Wv indicates the measured welding voltage. FIG. 4 also shows a temperature threshold range Rtm representing the surface temperature of the welded portion and a voltage threshold range Rvm representing the welding voltage when normal welding is performed. These temperature threshold range Rtm and voltage threshold range Rvm can be obtained based on past results.
図4から、幅方向位置P1においては、波形Wtが温度しきい値範囲Rtmを下回って、表面温度の測定値が温度しきい値範囲Rtm外にあることがわかる。すなわち、正常な溶接を行うことができず、溶接不良を発生している可能性が高い。しかしながら、溶接電圧の波形Wvは、電圧しきい値範囲Rvm内に収まっており、溶接電圧の測定値からは、幅方向位置P1における溶接不良の発生を認識することができない。 As can be seen from FIG. 4, at the width direction position P1, the waveform Wt falls below the temperature threshold range Rtm, and the measured value of the surface temperature is outside the temperature threshold range Rtm. That is, normal welding cannot be performed, and there is a high possibility that defective welding has occurred. However, the waveform Wv of the welding voltage is within the voltage threshold range Rvm, and the occurrence of welding failure at the width direction position P1 cannot be recognized from the measured value of the welding voltage.
ところが、幅方向位置における溶接電圧の波形Wvを観察すると、幅方向位置P1の近傍において、溶接電圧の測定値が急激に変化し、溶接電圧の金属帯幅方向の変化率の絶対値が極端に増加していることがわかる。このため、上述した実施の形態1のように、図3のステップS3において、電圧計16による溶接電圧の測定値から算出された溶接電圧の変化率を、予め定められている電圧変化率しきい値範囲と比較することにより、溶接電圧の測定値からも、幅方向位置P1の近傍で溶接不良が発生したと判定することが可能となる。 However, when the waveform Wv of the welding voltage at the position in the width direction is observed, the measured value of the welding voltage changes abruptly in the vicinity of the position P1 in the width direction, and the absolute value of the rate of change of the welding voltage in the metal band width direction is extremely large. It can be seen that it has increased. Therefore, as in the first embodiment described above, the change rate of the welding voltage calculated from the measured value of the welding voltage by the voltmeter 16 in step S3 of FIG. 3 is set to a predetermined voltage change rate threshold. By comparing with the value range, it is possible to determine from the measured value of the welding voltage that a welding failure has occurred in the vicinity of the position P1 in the width direction.
なお、表面温度の波形Wtを見るとわかるように、表面温度の測定値も、幅方向位置P1の近傍で急激に変化している。このため、図3のステップS2において、温度センサ15による表面温度の測定値から算出された表面温度の変化率を、予め定められている温度変化率しきい値範囲と比較することにより、表面温度の測定値からも、幅方向位置P1の近傍で溶接不良が発生したと判定することができる。 As can be seen from the surface temperature waveform Wt, the measured value of the surface temperature also changes abruptly in the vicinity of the position P1 in the width direction. For this reason, in step S2 of FIG. 3, the surface temperature change rate calculated from the measured value of the surface temperature by the temperature sensor 15 is compared with a predetermined temperature change rate threshold range to obtain the surface temperature. From the measured values, it can be determined that a welding failure has occurred in the vicinity of the position P1 in the width direction.
また、多数のラップシーム溶接例における、溶接電圧の金属帯幅方向D2の平均値とその発生数を図5のグラフに示す。このグラフにおいて、溶接不良を発生した溶接例E1が、平均値[−0.68V]を表す80余りの度数のうちの1つに含まれている。しかしながら、溶接不良の溶接例E1を図5のグラフから識別することはできない。 Further, the average value of the welding voltage in the metal band width direction D2 and the number of occurrences in a number of lap seam welding examples are shown in the graph of FIG. In this graph, the welding example E1 in which a welding failure has occurred is included in one of about 80 degrees representing the average value [−0.68 V]. However, the welding example E1 with poor welding cannot be identified from the graph of FIG.
これに対して、図5と同じ多数のラップシーム溶接例における、溶接電圧の変化率とその発生数を示す図6のグラフでは、溶接不良を発生した溶接例E1が、際だって大きな絶対値を有する電圧変化率[−32V/s]を表す度数のうちの1つに含まれている。また、電圧変化率の絶対値が30V/s以上となった溶接例では、いずれも、何らかの溶接不良を発生していることが確認された。そこで、電圧変化率の絶対値が30V/sよりも小さくなる電圧変化率しきい値範囲Rvrを予め定め、溶接電圧の変化率を電圧変化率しきい値範囲Rvrと比較することにより、溶接電圧の変化率から溶接の良否を判定可能であることがわかる。すなわち、溶接電圧の変化率が電圧変化率しきい値範囲Rvr内である場合には、溶接良好と判定され、電圧変化率しきい値範囲Rvr外である場合には、溶接不良と判定される。 On the other hand, in the graph of FIG. 6 showing the rate of change of the welding voltage and the number of occurrences in the same number of lap seam welding examples as in FIG. 5, the welding example E1 in which the welding failure has occurred has an extremely large absolute value. It is included in one of the frequencies representing the voltage change rate [−32 V / s]. Moreover, it was confirmed that any welding failure occurred in any of the welding examples in which the absolute value of the voltage change rate was 30 V / s or more. Therefore, a voltage change rate threshold range Rvr in which the absolute value of the voltage change rate is smaller than 30 V / s is determined in advance, and the welding voltage is compared with the voltage change rate threshold range Rvr to obtain a welding voltage. It can be seen that the quality of the welding can be determined from the rate of change of. That is, when the change rate of the welding voltage is within the voltage change rate threshold range Rvr, it is determined that welding is good, and when it is outside the voltage change rate threshold range Rvr, it is determined that welding is poor. .
なお、金属帯におけるシワの発生などに起因して重ね合わせ部3における2枚の金属帯1および2間の接触状態が局部的に悪くなると、重ね合わせ部3の表面と裏面の間の電気抵抗値が高くなって、溶接箇所の表面温度および溶接電圧が急激に変化するが、このとき、2枚の金属帯1および2間の接触状態に応じて重ね合わせ部3の表面と裏面の間の距離、すなわち重ね合わせ部3の厚さが局部的に変化し、その厚さの変化により加圧装置9が影響を受けることで、加圧力センサ17の測定値が変化することとなる。
このため、図3のステップS4において、加圧力センサ17による加圧力の測定値から算出された加圧力の変化率を、予め定められている加圧力変化率しきい値範囲と比較することにより、加圧力の測定値からも、溶接不良の発生を判定することが可能となる。
In addition, when the contact state between the two metal bands 1 and 2 in the overlapping portion 3 is locally deteriorated due to generation of wrinkles in the metal band, the electrical resistance between the front surface and the back surface of the overlapping portion 3 is reduced. The value increases and the surface temperature and welding voltage of the welded portion change abruptly. At this time, depending on the contact state between the two metal bands 1 and 2, the distance between the front surface and the back surface of the overlapping portion 3 is increased. The distance, that is, the thickness of the overlapping portion 3 changes locally, and the pressure device 9 is affected by the change in thickness, whereby the measured value of the pressure sensor 17 changes.
For this reason, in step S4 of FIG. 3, by comparing the rate of change of the applied pressure calculated from the measured value of the applied pressure by the applied pressure sensor 17, it is compared with a predetermined applied force change rate threshold range. It is possible to determine the occurrence of poor welding also from the measured value of the applied pressure.
上記の実施の形態1では、温度センサ15により重ね合わせ部3の溶接箇所の表面温度を測定したが、電極輪4の走行方向D3に対して電極輪4の後方から、溶接箇所の近傍、すなわち電極輪4と重ね合わせ部3の接触箇所の近傍の表面温度を測定しても、同様にして溶接の良否を判定することができる。
また、電極輪4が保持されている電極輪保持部材10に取り付けられている温度センサ15により電極輪4と重ね合わせ部3の接触箇所の表面温度を測定したが、電極輪5が保持されている電極輪保持部材11に温度センサ15を取り付けて、電極輪5と重ね合わせ部3の接触箇所またはその近傍の表面温度を測定してもよい。
In the first embodiment, the surface temperature of the welded portion of the overlapping portion 3 was measured by the temperature sensor 15, but from the rear of the electrode wheel 4 with respect to the traveling direction D3 of the electrode wheel 4, that is, in the vicinity of the welded portion. Even if the surface temperature in the vicinity of the contact portion between the electrode wheel 4 and the overlapping portion 3 is measured, the quality of the welding can be similarly determined.
Further, the surface temperature of the contact portion between the electrode wheel 4 and the overlapping portion 3 was measured by the temperature sensor 15 attached to the electrode wheel holding member 10 holding the electrode wheel 4, but the electrode wheel 5 was held. A temperature sensor 15 may be attached to the electrode wheel holding member 11 and the surface temperature at or near the contact point between the electrode wheel 5 and the overlapping portion 3 may be measured.
実施の形態2
上述した実施の形態1においては、図3に示されるように、溶接箇所の表面温度の変化率と、溶接電圧の変化率と、加圧力の変化率とが、いずれも予め定められている変化率しきい値範囲内である場合に溶接が良好であると判定したが、さらに、表面温度と溶接電圧と加圧力の測定値を、それぞれ、予め定められた温度しきい値範囲、電圧しきい値範囲および加圧力しきい値範囲と比較した結果をも加味して溶接の良否を判定することもできる。
Embodiment 2
In the first embodiment described above, as shown in FIG. 3, the change rate of the surface temperature of the welded portion, the change rate of the welding voltage, and the change rate of the applied pressure are all predetermined changes. If the welding temperature is within the threshold range, it is determined that the welding is good. In addition, the measured values of the surface temperature, welding voltage, and applied pressure are set to the predetermined temperature threshold range and voltage threshold, respectively. The quality of welding can also be determined by taking into account the result of comparison with the value range and the pressure threshold range.
図7は、実施の形態2に係る溶接良否判定装置における溶接の良否判定を示すフローチャートである。なお、実施の形態2に係る溶接良否判定装置は、図2に示した実施の形態1の溶接良否判定装置20と同一の構成を有している。
実施の形態2においては、溶接良否判定部18に、上述した温度変化率しきい値範囲と電圧変化率しきい値範囲と加圧力変化率しきい値範囲と併せて、正常な溶接がなされる場合における、重ね合わせ部3の溶接箇所の表面温度を表す温度しきい値範囲と、一対の電極輪4および5間の溶接電圧を表す電圧しきい値範囲と、一対の電極輪4および5による加圧力を表す加圧力しきい値範囲とが、予め定められ、格納されている。これらの温度しきい値範囲、電圧しきい値範囲および加圧力しきい値範囲は、過去の実績に基づいて求めることができる。
FIG. 7 is a flowchart showing the quality determination of welding in the welding quality determination apparatus according to the second embodiment. In addition, the welding quality determination apparatus according to the second embodiment has the same configuration as the welding quality determination apparatus 20 according to the first embodiment shown in FIG.
In the second embodiment, the welding quality determination unit 18 performs normal welding together with the temperature change rate threshold range, the voltage change rate threshold range, and the pressure change rate threshold range described above. In this case, the temperature threshold range representing the surface temperature of the welded portion of the overlapping portion 3, the voltage threshold range representing the welding voltage between the pair of electrode wheels 4 and 5, and the pair of electrode wheels 4 and 5 A pressure threshold value range representing the pressure is predetermined and stored. These temperature threshold value range, voltage threshold value range, and applied pressure threshold value range can be obtained based on past results.
図7におけるステップS1〜S6は、実施の形態1における図3のステップS1〜S6と同一であるため、詳細な説明は省略する。
ステップS1で、重ね合わせ部3の溶接箇所の表面温度と、一対の電極輪4および5間の溶接電圧と、一対の電極輪4および5による加圧力が測定され、ステップS2〜S4で、溶接箇所の表面温度の変化率が、予め定められている温度変化率しきい値範囲内であり、溶接電圧の変化率が、予め定められている電圧変化率しきい値範囲内であり、加圧力の変化率が、予め定められている加圧力変化率しきい値範囲内である場合に、さらにステップS7に進み、温度センサ15による重ね合わせ部3の溶接箇所の表面温度の測定値が、予め定められている温度しきい値範囲と比較される。
Since steps S1 to S6 in FIG. 7 are the same as steps S1 to S6 in FIG. 3 in the first embodiment, detailed description thereof is omitted.
In step S1, the surface temperature of the welded portion of the overlapping portion 3, the welding voltage between the pair of electrode wheels 4 and 5, and the pressure applied by the pair of electrode wheels 4 and 5 are measured. In steps S2 to S4, welding is performed. The change rate of the surface temperature of the location is within a predetermined temperature change rate threshold range, the change rate of the welding voltage is within a predetermined voltage change rate threshold range, and the pressurizing force When the change rate is within the predetermined pressure change rate threshold range, the process further proceeds to step S7, and the measured value of the surface temperature of the welded portion of the overlapping portion 3 by the temperature sensor 15 is determined in advance. Compared to a defined temperature threshold range.
ステップS7において、溶接箇所の表面温度の測定値が、予め定められている温度しきい値範囲内である場合には、ステップS8に進み、電圧計16による一対の電極輪4および5間の溶接電圧の測定値が、予め定められている電圧しきい値範囲と比較される。
ステップS8において、溶接電圧の測定値が、予め定められている電圧しきい値範囲内である場合には、さらに、ステップS9に進み、加圧力センサ17による加圧力の測定値が、予め定められている加圧力しきい値範囲と比較される。
そして、ステップS9において、加圧力の測定値が、予め定められている加圧力しきい値範囲内である場合には、溶接箇所の表面温度と、溶接電圧と、加圧力とが、いずれも予め定められている範囲内であることから、ステップS5で、現在行われている溶接が良好であると判定される。
In step S7, when the measured value of the surface temperature of the welded portion is within a predetermined temperature threshold range, the process proceeds to step S8, and welding between the pair of electrode wheels 4 and 5 by the voltmeter 16 is performed. The voltage measurement is compared to a predetermined voltage threshold range.
In step S8, when the measured value of the welding voltage is within a predetermined voltage threshold range, the process further proceeds to step S9, and the measured value of the applied pressure by the applied pressure sensor 17 is determined in advance. It is compared with the applied pressure threshold range.
In step S9, when the measured value of the applied pressure is within a predetermined applied pressure threshold range, the surface temperature of the welding location, the welding voltage, and the applied pressure are all determined in advance. Since it is within the determined range, it is determined in step S5 that the current welding is good.
一方、ステップS2〜S4で、溶接箇所の表面温度の変化率と、溶接電圧の変化率と、加圧力の変化率のいずれかが予め定められている変化率しきい値範囲外である場合、あるいは、ステップS7〜S9で、表面温度と、溶接電圧と、加圧力のいずれかが予め定められているしきい値範囲外である場合には、何らかの原因により異常が発生したと判断され、ステップS6で、現在行われている溶接は不良であると判定される。 On the other hand, when any one of the rate of change of the surface temperature of the welded portion, the rate of change of the welding voltage, and the rate of change of the applied pressure is outside the predetermined change rate threshold range in steps S2 to S4, Alternatively, in Steps S7 to S9, if any of the surface temperature, the welding voltage, and the applied pressure is outside the predetermined threshold range, it is determined that an abnormality has occurred for some reason, and Step In S6, it is determined that the current welding is defective.
すなわち、実施の形態2においては、溶接箇所の表面温度の変化率、溶接電圧の変化率、加圧力の変化率、溶接箇所の表面温度の測定値、溶接電圧の測定値、加圧力の測定値のすべてが、それぞれ予め定められているしきい値範囲内である場合にのみ、溶接は良好であると判定され、いずれか1つでも、しきい値範囲外になれば、溶接不良と判定される。
このように、溶接箇所の表面温度の変化率、溶接電圧の変化率および加圧力の変化率をそれぞれ予め定められた変化率しきい値範囲と比較するだけでなく、表面温度と溶接電圧と加圧力の測定値を、それぞれ、予め定められたしきい値範囲と比較した結果をも加味することにより、ラップシーム溶接における溶接の良否をさらに正確に判定することが可能となる。
That is, in the second embodiment, the rate of change in the surface temperature of the welding location, the rate of change in the welding voltage, the rate of change in the applied pressure, the measured value of the surface temperature of the welded location, the measured value of the welding voltage, and the measured value of the applied pressure Only when all of these are within the predetermined threshold range, it is determined that the welding is good, and if any one of them is out of the threshold range, it is determined that the welding is defective. The
Thus, not only the rate of change of the surface temperature of the welded portion, the rate of change of the welding voltage, and the rate of change of the applied pressure are compared with the predetermined change rate threshold range, but also the surface temperature, the welding voltage, By taking into account the result of comparing the measured pressure value with a predetermined threshold range, it is possible to more accurately determine the quality of welding in lap seam welding.
1,2 金属帯、1A 後端部、2A 先端部、3 重ね合わせ部、4,5 電極輪、6 キャリッジフレーム、7 上側腕部、8 下側腕部、9 加圧装置、10,11 電極輪保持部材、12 溶接電源、13 移動装置、14 レール、15 温度センサ、16 電圧計、17 加圧力センサ、18 溶接良否判定部、20 溶接良否判定装置、D1 連続ラインの進行方向、D2 金属帯の幅方向、D3 走行方向、Wt 表面温度の波形、Wv 溶接電圧の波形、Rtm 温度しきい値範囲、Rvm 電圧しきい値範囲、Rvr 電圧変化率しきい値範囲、P1 幅方向位置、E1 溶接例。 1, 2 Metal strip, 1A Rear end, 2A Front end, 3 Overlap, 4, 5 Electrode wheel, 6 Carriage frame, 7 Upper arm, 8 Lower arm, 9 Pressure device, 10, 11 Electrode Wheel holding member, 12 welding power source, 13 moving device, 14 rail, 15 temperature sensor, 16 voltmeter, 17 pressure sensor, 18 welding quality judgment unit, 20 welding quality judgment device, D1 traveling direction of continuous line, D2 metal strip Width direction, D3 travel direction, Wt surface temperature waveform, Wv welding voltage waveform, Rtm temperature threshold range, Rvm voltage threshold range, Rvr voltage change rate threshold range, P1 width direction position, E1 welding Example.
Claims (4)
溶接時における前記重ね合わせ部の溶接箇所またはその近傍の表面温度と前記一対の電極輪間の電圧と前記一対の電極輪による加圧力をそれぞれ測定し、
前記表面温度の測定値から算出される表面温度の変化率が予め定められた温度変化率しきい値範囲外である場合、または、前記電圧の測定値から算出される電圧の変化率が予め定められた電圧変化率しきい値範囲外である場合、または、前記加圧力の測定値から算出される加圧力の変化率が予め定められた加圧力変化率しきい値範囲外である場合に、溶接不良と判定することを特徴とするラップシーム溶接の溶接良否判定方法。 The overlapping portion of the metal band is pressed between a pair of electrode wheels, and the pair of electrode wheels are moved relative to the overlapping portion in a state where the pair of electrode wheels are energized. A method for determining whether or not a lap seam weld is welded.
Measure the surface temperature of the welded portion of the overlapping portion at the time of welding or the vicinity thereof, the voltage between the pair of electrode wheels, and the applied pressure by the pair of electrode wheels
When the change rate of the surface temperature calculated from the measured value of the surface temperature is outside a predetermined temperature change rate threshold range, or the change rate of the voltage calculated from the measured value of the voltage is determined in advance. When the voltage change rate threshold value is out of the range, or when the pressure change rate calculated from the measurement value of the pressure force is outside the predetermined pressure change rate threshold range, A method for determining the quality of welding in lap seam welding, characterized in that it is determined that welding is poor.
溶接時における前記重ね合わせ部の溶接箇所またはその近傍の表面温度を測定する温度センサと、
溶接時における前記一対の電極輪間の電圧を測定する電圧計と、
溶接時における前記一対の電極輪による加圧力を測定する加圧力センサと、
前記温度センサによる前記表面温度の測定値から算出される表面温度の変化率が予め定められた温度変化率しきい値範囲外である場合、または、前記電圧計による前記電圧の測定値から算出される電圧の変化率が予め定められた電圧変化率しきい値範囲外である場合、または、前記加圧力センサによる前記加圧力の測定値から算出される加圧力の変化率が予め定められた加圧力変化率しきい値範囲外である場合に、溶接不良と判定する溶接良否判定部と
を備えたことを特徴とするラップシーム溶接の溶接良否判定装置。 The overlapping portion of the metal band is pressed between a pair of electrode wheels, and the pair of electrode wheels are moved relative to the overlapping portion in a state where the pair of electrode wheels are energized. A welding quality determination device for lap seam welding for welding,
A temperature sensor for measuring the surface temperature of the welded portion of the overlapped portion or its vicinity during welding; and
A voltmeter for measuring the voltage between the pair of electrode wheels during welding;
A pressure sensor for measuring the pressure applied by the pair of electrode wheels during welding;
When the change rate of the surface temperature calculated from the measured value of the surface temperature by the temperature sensor is outside a predetermined temperature change rate threshold range, or calculated from the measured value of the voltage by the voltmeter The rate of change of the applied voltage is outside a predetermined voltage change rate threshold range, or the rate of change of the applied pressure calculated from the measured value of the applied pressure by the applied pressure sensor is determined in advance. A welding quality judgment device for lap seam welding, comprising: a welding quality judgment unit that judges that welding is defective when the pressure change rate is out of a threshold range.
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