JP3323546B2 - Weldment diagnostic equipment - Google Patents

Weldment diagnostic equipment

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Publication number
JP3323546B2
JP3323546B2 JP23319092A JP23319092A JP3323546B2 JP 3323546 B2 JP3323546 B2 JP 3323546B2 JP 23319092 A JP23319092 A JP 23319092A JP 23319092 A JP23319092 A JP 23319092A JP 3323546 B2 JP3323546 B2 JP 3323546B2
Authority
JP
Japan
Prior art keywords
welding
magnetic field
welded
field strength
differential value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP23319092A
Other languages
Japanese (ja)
Other versions
JPH06155042A (en
Inventor
克浩 寺井
勝郎 出島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP23319092A priority Critical patent/JP3323546B2/en
Publication of JPH06155042A publication Critical patent/JPH06155042A/en
Application granted granted Critical
Publication of JP3323546B2 publication Critical patent/JP3323546B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、抵抗加熱を利用した溶
接機により溶接される溶接部の健全性を診断する溶接部
診断装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding part diagnostic apparatus for diagnosing the integrity of a welded part to be welded by a welding machine utilizing resistance heating.

【0002】[0002]

【従来の技術】従来において、2枚の鋼板を溶接して接
合するには、互いに重ね合わせた鋼板に電流を流し、こ
の鋼板に発生する接触抵抗によるジュ−ル熱により、上
記鋼板の重ね合わせ部分を溶融状態にし、この溶融され
た部分を一対の圧下ロ−ルにより加圧して溶接する抵抗
溶接機がある。
2. Description of the Related Art Conventionally, when two steel sheets are welded and joined together, an electric current is applied to the steel sheets which are superimposed on each other, and the steel sheets are superposed by Joule heat generated by contact resistance generated on the steel sheets. There is a resistance welding machine in which a portion is melted and the melted portion is welded by pressing with a pair of reduction rolls.

【0003】この溶接機において、溶接が終了してその
溶接がされた部分(以下、単に溶接部という)の健全性
を診断するためには、通常、溶接部の溶接不良を検査員
の目視で検査する目視検査法、または、溶接部をハンマ
−で叩いて溶接部が破壊することにより溶接不良を検査
するハンマリング検査法が行なわれている。
[0003] In this welding machine, in order to diagnose the soundness of the welded portion after the welding is completed (hereinafter simply referred to as a welded portion), usually, an inspector visually checks the welding failure of the welded portion. A visual inspection method for inspecting or a hammering inspection method for inspecting a welding defect by hitting a weld with a hammer to break the weld is performed.

【0004】しかしながら、目視検査法では、溶接部の
内部に存在する溶接不良を発見することができず、ま
た、ハンマリング検査法では、健全な溶接部にもキズを
つけることになるので、このキズがロ−ルへのキズ、ピ
ックアップの発生原因となり、しいては、製品へのキズ
転写につながるという問題があった。
[0004] However, the visual inspection method cannot detect welding defects existing inside the welded portion, and the hammering inspection method also damages a sound welded portion. There is a problem in that the scratches cause scratches on the roll and pick-up, and eventually lead to the transfer of the scratches to the product.

【0005】更に、上記両検査法とも検査員の熟練と感
に頼るところが大きいので、溶接部の溶接不良を検査す
るのに生産ラインの停止時間が長時間になるとともに、
客観的、定量的な溶接部の診断が困難であるという問題
があった。
[0005] Further, since both of the above-mentioned inspection methods largely rely on the skill and feeling of the inspector, the production line has to be stopped for a long time to inspect the welding defects of the welded parts,
There is a problem that it is difficult to objectively and quantitatively diagnose a weld.

【0006】この目視検査法、およびハンマリング検査
法の欠点を解消するものとして、特開昭55−3605
7号公報に示されているようなフォ−カス型探触子を用
いて、超音波を溶接部に放射し、溶接不良のある場合と
正常な場合との溶接部により反射される超音波の波形を
比較することにより、溶接不良を発見する超音波探傷法
があり、また、特開昭56−71586号公報に示され
ているように、鋼板に流される溶接電流を最適の電流値
に制御することにより、常に、均一な溶接強度を得て溶
接不良をなくす電流制御法がある。
To solve the disadvantages of the visual inspection method and the hammering inspection method, Japanese Patent Application Laid-Open No. 55-3605 discloses a method.
U.S. Pat. No. 7,087,859 radiates ultrasonic waves to a weld using a focus-type probe as described in Japanese Patent Application Publication No. There is an ultrasonic flaw detection method for detecting welding defects by comparing waveforms, and as shown in JP-A-56-71586, a welding current flowing through a steel sheet is controlled to an optimum current value. Therefore, there is a current control method that always obtains uniform welding strength and eliminates welding defects.

【0007】しかしながら、超音波探傷法では、接触媒
体が必要となるとともに、重ね合わされた鋼板に板段差
が存在すると、この板段差からの反射波が影響して溶接
部面からの反射波が所定の強度信号を得られなくなると
ともに、フォ−カス型探触子といった装置が必要となる
ため溶接装置全体が複雑になるという問題がある。
[0007] However, in the ultrasonic flaw detection method, a contact medium is required, and if there is a plate step in the superposed steel plates, the reflected wave from the plate step influences and the reflected wave from the welded portion surface becomes a predetermined wave. In addition, there is a problem that the intensity signal of the welding cannot be obtained, and an apparatus such as a focus type probe is required, so that the entire welding apparatus becomes complicated.

【0008】また、電流制御法では、適正な溶接電流値
を求めるために予備溶接を行なう必要があるので、溶接
工程が煩雑になるとともに、溶接に多くの時間が必要に
なるという問題がある。
Further, in the current control method, it is necessary to perform preliminary welding in order to obtain an appropriate welding current value, so that there is a problem that the welding process becomes complicated and that much time is required for welding.

【0009】そこで、さらに超音波検査法、および電流
制御法の欠点を解消するものとして、磁気探傷法が公知
技術として知られている。この種の磁気探傷法は、溶接
部に沿って移動して該溶接部を磁化する磁気装置を設け
て、溶接部に存在するピンホ−ルやクラックなどの傷か
ら漏洩する漏洩磁束を磁気センサが検出し、この磁気セ
ンサからの出力信号、即ち、溶接部における磁束の変動
を検出することにより溶接部の健全性を診断するもので
ある。
In order to further solve the disadvantages of the ultrasonic inspection method and the current control method, a magnetic flaw detection method is known as a known technique. In this type of magnetic flaw detection method, a magnetic device that moves along a weld and magnetizes the weld is provided, and a magnetic sensor detects a leakage magnetic flux leaking from a flaw such as a pinhole or a crack existing in the weld. The soundness of the welded part is diagnosed by detecting the output signal from the magnetic sensor, that is, the fluctuation of the magnetic flux in the welded part.

【0010】[0010]

【発明が解決しようとする課題】しかしながら、この従
来の磁気探傷法では、溶接部を磁化させるための磁気装
置を設ける必要があり、溶接機全体の構成が複雑・大型
化になるという問題がある。
However, in the conventional magnetic flaw detection method, it is necessary to provide a magnetic device for magnetizing the welded portion, and there is a problem that the configuration of the entire welding machine becomes complicated and large. .

【0011】本発明は、このような問題を解決するため
になされたもので、簡単な構造で、溶接後、即座に溶接
部の健全性を診断することができる溶接部診断装置を提
供することを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide a welded portion diagnostic apparatus which can diagnose the soundness of a welded portion immediately after welding with a simple structure. With the goal.

【0012】[0012]

【課題を解決するための手段】上記目的を達成するため
に、本発明の溶接部診断装置は、移動可能な一対の電極
により被溶接材同士の重ね合わせ部が挟まれ、一方の電
極から他方の電極に通電する電流によりシーム溶接され
る溶接部の健全性を診断する溶接部診断装置において、
上記溶接部に沿って移動可能に配置され、磁気光学効果
素子を有し、所定速度で移動して上記電流により上記溶
接部に発生する磁界強さを検出する検出部と、この検出
部からの出力信号を磁界強さの微分値を示す信号に変換
する変換器とを備え、上記磁界強さの微分値の変動箇所
と上記検出部の移動速度とに基づき演算により溶接不良
箇所を求めることを特徴とする。
In order to achieve the above-mentioned object, a welding part diagnostic apparatus according to the present invention comprises a movable pair of electrodes.
The overlapped portion of the materials to be welded is sandwiched by
Seam welding is performed by the current flowing from one electrode to the other.
In the welding part diagnostic device for diagnosing the integrity of the welding part,
It is arranged movably along the above-mentioned welding part, and the magneto-optical effect
It has an element, moves at a predetermined speed, and
A detector for detecting the strength of the magnetic field generated at the contact portion;
Output signal from the unit is converted to a signal indicating the differential value of the magnetic field strength
And a converter that changes the differential value of the magnetic field strength.
Welding failure by calculation based on the above and the moving speed of the detection unit
It is characterized in that a position is obtained.

【0013】[0013]

【作用】上述した本発明の溶接部診断装置では、電極間
を通電する電流により、溶接された箇所に発生する磁界
強さの変動を検出部で逐次検出することにより溶接部の
健全性を診断することができる。
In the above-described welding part diagnostic apparatus of the present invention, the soundness of the welded part is diagnosed by sequentially detecting the fluctuation of the magnetic field intensity generated at the welded part by the current flowing between the electrodes by the detecting part. can do.

【0014】[0014]

【実施例】以下、本発明の一実施例を図面を参照して説
明する。
An embodiment of the present invention will be described below with reference to the drawings.

【0015】図1において、1A、1Bは所定幅を有す
る鋼板であって、図2(a)の如く、この2枚の鋼板1
A、1Bの各縁を重ねて、溶接が行なわれる合わせ部1
aが形成されており、この鋼板1A、1Bの重ね合わせ
状態を保持するクランプ2が、それぞれの鋼板1A、1
Bを挟持して設けられている。
In FIG. 1, reference numerals 1A and 1B denote steel plates having a predetermined width. As shown in FIG.
A joining section 1 where the edges of A and 1B are overlapped and welding is performed.
a is formed, and the clamps 2 for holding the steel plates 1A and 1B in a superposed state are attached to the respective steel plates 1A and 1B.
B is provided.

【0016】3Aは上電極輪、3Bは下電極輪であっ
て、合わせ部1aを挟んで鋼板1A、1Bにそれぞれ当
接しており、図示しない駆動機構により鋼板1A、1B
の幅方向に転動可能となっている。また、上・下電極輪
3A、3Bは、高電圧を形成する変圧装置4に接続され
て、この下電極輪3Bから合わせ部1aを介して上電極
輪3Aに向かって溶接電流を通電し、この合わせ部1a
に接触抵抗によるジュ−ル熱を発生させて鋼板1A、1
Bを、図2(b)の如く、溶融して溶接部1bを形成す
る。
Reference numeral 3A denotes an upper electrode wheel, and 3B denotes a lower electrode wheel. The lower electrode wheel is in contact with the steel plates 1A and 1B with the joining portion 1a interposed therebetween.
It is possible to roll in the width direction. The upper and lower electrode wheels 3A, 3B are connected to a transformer 4 for forming a high voltage, and a welding current is applied from the lower electrode wheel 3B to the upper electrode wheel 3A via the joint 1a. This joining part 1a
Joule heat due to contact resistance is generated in the steel sheets 1A, 1A
B is melted to form a weld 1b as shown in FIG. 2 (b).

【0017】5A、5Bは上・下一対の圧下ロ−ルであ
って、合わせ部1aを挟さんで鋼板1A、1Bにそれぞ
れ当接しており、図示しない駆動機構を介して鋼板1
A、1Bの幅方向に転動可能にされている。上・下圧下
ロ−ル5A、5Bは、上・下電極輪3A、3Bの転動に
所定間隔を保って追随移動し、この上・下電極輪3A、
3Bにより溶融された溶接部1bを圧下して、図2(c)
の如く、鋼板1Aと鋼板1Bとの段部を平にする。
Reference numerals 5A and 5B denote a pair of upper and lower rolling rolls which respectively contact the steel plates 1A and 1B with the joining portion 1a interposed therebetween.
Rollable in the width direction of A and 1B. The upper and lower rolling rolls 5A and 5B follow the rolling of the upper and lower electrode wheels 3A and 3B with a predetermined interval, and move.
The welded portion 1b melted by 3B is pressed down, as shown in FIG.
As described above, the step between the steel plate 1A and the steel plate 1B is flattened.

【0018】6は溶接部診断装置であって、検出部6A
と変換器6Bとで構成されている。検出部6Aは、磁気
を光に変換する磁気光学効果素子が用いられており、上
電極輪3Aの軸中心直下部から水平半径方向の上電極輪
3Aと上圧下ロ−ル5Aとの間に溶接部1bと対向する
ように設けられている。
Reference numeral 6 denotes a welding portion diagnostic device, and a detecting portion 6A
And a converter 6B. The detecting section 6A uses a magneto-optical effect element for converting magnetism into light, and is disposed between the upper electrode wheel 3A and the upper rolling roll 5A in the horizontal radial direction from immediately below the axial center of the upper electrode wheel 3A. It is provided so as to face the welded portion 1b.

【0019】また、検出部6は、図示しない駆動機構を
介して上・下電極輪3A、3Bの転動時にこの上・下電
極輪3A、3Bと所定間隔を保って(測定結果によると
電極輪の鋼板の接点から150mmの間隔が良好であっ
た)追随移動するようになっており、鋼板1A、1Bの
溶接部1bに上記溶接電流により発生する磁界強さを逐
次、検出して、この出力信号が光ファイバケ−ブル7を
介して変換器6Bに送出される。
The detecting unit 6 keeps a predetermined distance from the upper and lower electrode wheels 3A and 3B when rolling the upper and lower electrode wheels 3A and 3B via a driving mechanism (not shown) (according to the measurement result, the electrode (The distance of 150 mm was good from the contact point of the steel plate of the wheel.) The magnetic field strength generated by the welding current in the welded portion 1b of the steel plates 1A and 1B was sequentially detected, and The output signal is sent to the converter 6B via the optical fiber cable 7.

【0020】変換器6Bは、検出部6Aからの出力信号
を入力すると磁界強さを微分値に変換するとともに、検
出部6Aの移動時間と上記磁界9強さ微分値との関係を
ディスプレ−に表示し、記録用紙に記録する。
The converter 6B receives the output signal from the detector 6A, converts the magnetic field strength into a differential value, and displays the relationship between the moving time of the detector 6A and the magnetic field 9 differential value on a display. Display and record on recording paper.

【0021】このような構成において、以下、本実施例
の溶接部診断装置6による溶接部1bの診断の手順につ
いて説明する。
The procedure of diagnosing the welded portion 1b by the welded portion diagnostic apparatus 6 according to the present embodiment in such a configuration will be described below.

【0022】鋼板1A幅の一端から他端に向かって上・
下電極輪3A、3Bが合わせ部1aを転動していき、下
電極輪3Bから上電極輪3Aに通電される溶接電流によ
り合わせ部1aに発生する接触抵抗によるジュ−ル熱に
より合わせ部1aを溶融し、そして、上・下圧下ロ−ル
5A・5Bでこの溶接部1bを圧下して溶接して行く、
また、検出部6Aが上・下電極輪3A、3Bの転動に追
随して溶接部1b上を所定速度で移動していき、図3
(a)の如く、上記溶接電流を中心にして発生する磁界9
の強さを逐次、検出し、検出信号として変換器6Bに送
出する。そして、この出力信号を入力した変換器6Bは
磁界9強さを微分値に変換するとともに、移動時間と磁
界強さの微分値の関係の波形(以下、単に出力波形とい
う)をディスプレ−に表示するとともに、記録紙に記録
する。
From one end of the steel plate 1A width toward the other end,
The lower electrode wheels 3A and 3B roll on the joining portion 1a, and the joining portion 1a is formed by Joule heat due to contact resistance generated in the joining portion 1a by a welding current supplied from the lower electrode wheel 3B to the upper electrode wheel 3A. Is melted, and the welding portion 1b is reduced by upper and lower rolling rolls 5A and 5B and welded.
Further, the detection unit 6A moves at a predetermined speed on the welded portion 1b following the rolling of the upper and lower electrode wheels 3A and 3B, and FIG.
(a) As shown in FIG.
Are sequentially detected and sent to the converter 6B as a detection signal. The converter 6B, which has received the output signal, converts the strength of the magnetic field 9 into a differential value and displays a waveform (hereinafter, simply referred to as an output waveform) having a relationship between the moving time and the differential value of the magnetic field strength on a display. And record it on a recording paper.

【0023】このとき、上・下電極輪3A、3Bにより
溶融された溶接部1bに、図3(b)に示す如く、空洞欠
陥10などの溶接不良箇所が存在すると、この空洞欠陥
10の周辺には下電極輪3Bから上電極輪3Aに通電さ
れる上記溶接電流が迂回する現象が起こり、これに伴っ
て磁界9が斜めに傾むくことになる。そして、この空洞
欠陥10上を検出部6Aが通過すると、図4に示す如
く、上記迂回した上記溶接電流により傾けられた磁界9
の鋼板1A、1B幅方向に対して鉛直方向の成分9aが
磁界9とともに検出部6Aにより検出されて、これが出
力信号として変換器6Bに送出され、この出力信号を入
力した変換器6Bが変換する磁界9強さの微分値が変動
することになる。
At this time, as shown in FIG. 3 (b), if there is a defective weld such as a cavity defect 10 in the welded portion 1b melted by the upper and lower electrode rings 3A and 3B, the periphery of the cavity defect 10 In this case, a phenomenon occurs in which the welding current supplied from the lower electrode wheel 3B to the upper electrode wheel 3A bypasses, and accordingly, the magnetic field 9 is inclined obliquely. When the detecting unit 6A passes over the cavity defect 10, as shown in FIG. 4, the magnetic field 9 tilted by the detouring welding current is applied.
The component 9a in the direction perpendicular to the width direction of the steel plates 1A and 1B is detected by the detection unit 6A together with the magnetic field 9, and this is sent out as an output signal to the converter 6B, which converts the output signal. The derivative of the strength of the magnetic field 9 fluctuates.

【0024】また、図5に示す如く、上・下電極輪3
A、3Bのスパ−ク等より溶接部1bにピンホ−ル11
などが存在すると、上記溶接電流を中心として磁界9が
該ピンホ−ル11において漏洩磁束12が発生する。そ
して、検出部6Aがピンホ−ル11上を通過する時に
は、このピンホ−ル11に生じる漏洩磁束12が磁界9
とともに、検出部6Aにより検出されて、これが出力信
号をして変換器6Bに送出され、この出力信号を入力し
た変換器6Bが変換する磁界9強さの微分値が変動する
ことになる。
Also, as shown in FIG.
A, 3B sparkle or the like, pinhole 11
When the magnetic field 9 exists around the welding current, a leakage magnetic flux 12 is generated in the pinhole 11. When the detector 6A passes over the pinhole 11, the leakage magnetic flux 12 generated in the pinhole 11 is
At the same time, it is detected by the detection unit 6A, and is output as an output signal to the converter 6B, and the differential value of the strength of the magnetic field 9 converted by the converter 6B that has received the output signal fluctuates.

【0025】そして、変換器6Bに記録される出力波形
の上記空洞欠陥10、またはピンホ−ル11における移
動時間と検出部6Aの移動速度とから、空洞欠陥10、
およびピンホ−ル11の鋼板1A、1Bの幅端からの位
置(距離)を求めることができる。
Then, based on the moving time of the output waveform recorded in the converter 6B in the cavity defect 10 or the pinhole 11 and the moving speed of the detecting section 6A, the cavity defect 10,
In addition, the position (distance) of the pinhole 11 from the width end of the steel plates 1A and 1B can be obtained.

【0026】ここで、図6、図7、および図8は、実際
に溶接される溶接部1bの磁界9強さを検出した測定結
果を示すグラフである。
Here, FIGS. 6, 7 and 8 are graphs showing measurement results of detecting the strength of the magnetic field 9 of the welded portion 1b to be actually welded.

【0027】図6は、溶接部1bの溶接状態が良好な場
合の出力信号の波形を示しており、縦軸に磁界9強さの
微分値、横軸に検出部の移動時間を示している出力波形
である。また、この出力波形において、13は溶接の開
始時点であり、溶接の終了時点14まで溶接作動が続い
ている。
FIG. 6 shows the waveform of the output signal when the welding condition of the welded portion 1b is good, with the vertical axis representing the differential value of the strength of the magnetic field 9 and the horizontal axis representing the moving time of the detector. It is an output waveform. In this output waveform, reference numeral 13 denotes a welding start point, and the welding operation is continued until the welding end point 14.

【0028】また、図7および図8は、出力波形に大き
な磁界9の変動がみられた。即ち、溶接部1bにピンホ
−ル11が生じると、それにより磁界9が乱され、一
端、出力信号が落ちこむ部分15が存在する波形になる
が、次の瞬間に、ピンホ−ル11からの漏洩磁束12を
検出部6Aが、ピンホ−ル11の回りに発生している磁
界9とともに検出することになるので、このピンホ−ル
11の磁界9強さが大きくなる部分16が存在する。そ
して、上記図7、および図8における出力波形の変動箇
所の移動時間と検出部6Aの移動速度とから、上述の如
く、ピンホ−ル11の位置を計算することにより、溶接
部1bの溶接不良の箇所を求めることができる。
7 and 8, large fluctuations of the magnetic field 9 were observed in the output waveform. That is, when the pinhole 11 is generated in the welded portion 1b, the magnetic field 9 is disturbed by the pinhole 11 and the waveform has a portion 15 where the output signal falls, but the leakage from the pinhole 11 occurs at the next moment. Since the detection unit 6A detects the magnetic flux 12 together with the magnetic field 9 generated around the pinhole 11, there is a portion 16 where the strength of the magnetic field 9 of the pinhole 11 is increased. Then, as described above, the position of the pinhole 11 is calculated from the moving time of the change point of the output waveform in FIGS. 7 and 8 and the moving speed of the detecting unit 6A, thereby obtaining the poor welding of the welding portion 1b. Can be obtained.

【0029】このように、本実施例の溶接部診断装置に
よれば、下電極輪3Bから上電極輪3Aに合わせ部1a
を介して通電される溶接電流より発生する磁界9強さを
検出部6Aで逐次、検出して、この検出部6Aからの出
力信号が与えられる変換器6Bにより、磁界強さの微分
値と検出部6Aの移動時間との関係を示す出力波形が出
力される。そして、この出力波形の変動点における検出
部6Aの移動時間と検出部6Aの移動速度とにより、
接部1bにおける溶接不良の箇所を算出することができ
る。
As described above, according to the welding portion diagnostic apparatus of the present embodiment, the fitting portion 1a is connected from the lower electrode wheel 3B to the upper electrode wheel 3A.
In sequential detects detector 6A magnetic field 9 intensity generated from the welding current supplied through the, output from the detecting unit 6A
The transducer 6B to which the force signal is applied allows differentiation of the magnetic field strength
An output waveform indicating the relationship between the value and the moving time of the detection unit 6A is output.
Is forced. Then, detection at the variation point of the output waveform
Based on the moving time of the part 6A and the moving speed of the detecting part 6A, it is possible to calculate the location of the welding failure in the welded part 1b.

【0030】以上詳述したように、本発明の溶接部診断
装置によれば、磁気光学効果素子を有する検出部が所定
速度で移動して、電極の溶接電流により溶接部に発生す
磁界強さを検出し、変換器により上記検出部からの出
力信号を磁界強さの微分値を示す信号に変換し、上記変
換器により得られる磁界強さ微分値の変動箇所と、上記
検出部の移動速度とに基づいて溶接部の溶接不良箇所を
算出しているので、従来とは違って、溶接部を磁化する
ための磁気装置を設ける必要がなくて溶接機全体の構造
が簡単になるとともに、溶接後、即座に短時間で溶接部
を診断することができる。
As described above in detail, according to the welding portion diagnostic apparatus of the present invention, the detecting portion having the magneto-optical effect element moves at a predetermined speed, and the intensity of the magnetic field generated in the welding portion by the welding current of the electrode. detects, out from the detection unit by the transducer
The force signal is converted into a signal indicating the differential value of the magnetic field strength, and
In order to magnetize the welded portion unlike the conventional one , since the location where the magnetic field strength differential value obtained by the heat exchanger varies and the location of the welding failure of the welded portion is calculated based on the moving speed of the detection portion, together it becomes simple structure of the entire welding machine is not necessary to provide a magnetic device, can diagnose the weld after welding, immediately in a short time.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例としての抵抗溶接機と溶接部
診断装置とを示す概念斜視図である。
FIG. 1 is a conceptual perspective view showing a resistance welding machine and a welding part diagnostic device as one embodiment of the present invention.

【図2】図1における鋼板の合わせ部、および溶接部を
示す断面図である。
FIG. 2 is a sectional view showing a joining portion and a welding portion of the steel plates in FIG.

【図3】図1における溶接電流と磁界の関係を示す概略
図である。
FIG. 3 is a schematic diagram showing a relationship between a welding current and a magnetic field in FIG.

【図4】図3における磁界の成分と検出部との関係を示
す概略図である。
FIG. 4 is a schematic diagram illustrating a relationship between a component of a magnetic field and a detection unit in FIG. 3;

【図5】溶接部にピンホ−ルが存在する時における検出
部の検査状態を示す概略側面図である。
FIG. 5 is a schematic side view showing an inspection state of a detection unit when a pinhole is present in a welded portion.

【図6】正常溶接時における時間と磁界強さの微分値と
の関係を示す実測グラフである。
FIG. 6 is an actual measurement graph showing a relationship between time and a differential value of magnetic field strength during normal welding.

【図7】溶接不良が存在する時における時間と磁界強さ
の微分値との関係を示す実測グラフである。
FIG. 7 is an actual measurement graph showing a relationship between time and a differential value of magnetic field strength when a welding defect exists.

【図8】溶接不良が存在する時における時間と磁界強さ
の微分値との関係を示すで他の例の実測グラフである。
FIG. 8 is an actual measurement graph showing another example of a relationship between time and a differential value of magnetic field strength when a welding defect exists.

【符号の説明】[Explanation of symbols]

1A,1B 鋼板 1b 溶接部 3A、3B 電極輪 6 溶接部診断装置 6A 検出部 6B 変換器 1A, 1B Steel plate 1b Welded part 3A, 3B Electrode wheel 6 Welded part diagnostic device 6A Detector 6B Converter

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B23K 11/24 B23K 11/25 G01N 27/83 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B23K 11/24 B23K 11/25 G01N 27/83

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 移動可能な一対の電極により被溶接材同
士の重ね合わせ部が挟まれ、一方の電極から他方の電極
に通電する電流によりシーム溶接される溶接部の健全性
を診断する溶接部診断装置において、上記溶接部に沿っ
て移動可能に配置され、磁気光学効果素子を有し、所定
速度で移動して上記電流により上記溶接部に発生する磁
界強さを検出する検出部と、この検出部からの出力信号
を磁界強さの微分値を示す信号に変換する変換器とを備
え、上記磁界強さの微分値の変動箇所と上記検出部の移
動速度とに基づき演算により溶接不良箇所を求めること
を特徴とする溶接部診断装置。
1. A material to be welded by a pair of movable electrodes.
Between the two electrodes
Of seam welded by seam welding by electric current passing through
In the welding part diagnostic apparatus for diagnosing
Movably arranged, having a magneto-optical effect element,
The magnet moves at the speed and generates
Detector for detecting field strength and output signal from this detector
And a converter for converting the signal into a signal indicating the differential value of the magnetic field strength.
The location of the change in the differential value of the magnetic field strength and the movement of the detection unit
A welding part diagnosis apparatus characterized in that a defective welding position is obtained by calculation based on a dynamic speed .
JP23319092A 1992-09-01 1992-09-01 Weldment diagnostic equipment Expired - Lifetime JP3323546B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23319092A JP3323546B2 (en) 1992-09-01 1992-09-01 Weldment diagnostic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23319092A JP3323546B2 (en) 1992-09-01 1992-09-01 Weldment diagnostic equipment

Publications (2)

Publication Number Publication Date
JPH06155042A JPH06155042A (en) 1994-06-03
JP3323546B2 true JP3323546B2 (en) 2002-09-09

Family

ID=16951158

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23319092A Expired - Lifetime JP3323546B2 (en) 1992-09-01 1992-09-01 Weldment diagnostic equipment

Country Status (1)

Country Link
JP (1) JP3323546B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3317366B2 (en) * 1993-01-07 2002-08-26 偕成エンジニア株式会社 Electromagnetic induction type sensor
KR102227538B1 (en) * 2020-07-28 2021-03-15 (주)이너아이 Nondestructive inspection method of welding part of cylindrical secondary battery

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63215384A (en) * 1987-03-05 1988-09-07 Mitsubishi Electric Corp Seam welding equipment
JPH0386382A (en) * 1989-08-29 1991-04-11 Fuji Koon Seisakusho:Kk Welding inspection instrument for resistance welding

Also Published As

Publication number Publication date
JPH06155042A (en) 1994-06-03

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