JP2786806B2 - Evaluation method for thin plate welds - Google Patents
Evaluation method for thin plate weldsInfo
- Publication number
- JP2786806B2 JP2786806B2 JP6016535A JP1653594A JP2786806B2 JP 2786806 B2 JP2786806 B2 JP 2786806B2 JP 6016535 A JP6016535 A JP 6016535A JP 1653594 A JP1653594 A JP 1653594A JP 2786806 B2 JP2786806 B2 JP 2786806B2
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- welding
- welded portion
- width
- ave
- thin plate
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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、薄板の溶接部を非接触
下で評価する方法に関し、詳しくは、鉄鋼、アルミ等の
非鉄金属等における溶接プロセスにおいて抵抗加熱等を
利用した溶接機による薄板の溶接加工に随伴しながら薄
板溶接部の引張強度をオンライン下で迅速に評価する薄
板の溶接部評価方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating a welded portion of a thin plate in a non-contact manner, and more particularly, to a thin plate by a welding machine utilizing resistance heating or the like in a welding process for a non-ferrous metal such as steel or aluminum. The present invention relates to a thin plate weld evaluation method for quickly evaluating the tensile strength of a thin plate weld online while accommodating the welding of steel.
【０００２】[0002]
【従来の技術】鉄鋼業、アルミなど非鉄金属業、金属加
工メーカーの各業種での溶接工程における溶接部分の溶
接条件、溶接状態をチェックすることは、製品の品質管
理の点から重要である。そのチェック手段として、オン
ライン下で溶接部を連続的に検査し、溶接部の健全性を
診断する手段が広く採用されている。2. Description of the Related Art It is important from the viewpoint of quality control of products to check welding conditions and welding conditions of welding portions in welding processes in various industries of a steel industry, a non-ferrous metal industry such as aluminum, and a metal processing manufacturer. As the checking means, means for continuously inspecting the welded part online and diagnosing the soundness of the welded part is widely adopted.
【０００３】鉄鋼圧延工程の連続焼鈍ラインや、連続溶
融亜鉛メッキライン等の如く、薄板を走行させながら連
続処理するプロセスにおいては、該プロセスの途中に薄
板同士（先行板と後続板）をつなぐために溶接され、そ
の溶接部の健全性が診断されるが、この溶接部診断はオ
ンライン下で迅速に行われなければならない。[0003] In a process in which a thin plate is continuously processed while traveling, such as a continuous annealing line in a steel rolling process and a continuous hot-dip galvanizing line, the thin plates (the preceding plate and the succeeding plate) are connected during the process. And the integrity of the weld is diagnosed, but this weld diagnosis must be done quickly and online.
【０００４】例えば、連続溶融亜鉛メッキラインの場
合、図１に示す如く、ペイオフリール１から供給された
鋼板５（後続板）は、溶接機２部で処理中の先行板と溶
接して搬送されるが、この溶接のための許容時間は、焼
鈍炉４の手前に設けられた入り側ループカー３に備蓄さ
れたものが吐き出される迄という制約を受ける。そのた
め、溶接部診断はオンライン下で迅速に行う必要があ
る。For example, in the case of a continuous hot-dip galvanizing line, as shown in FIG. 1, a steel plate 5 (following plate) supplied from a payoff reel 1 is conveyed by welding with a preceding plate being processed by a welding machine 2 part. However, the permissible time for this welding is restricted until the one stored in the entrance loop car 3 provided in front of the annealing furnace 4 is discharged. Therefore, it is necessary to perform the weld diagnosis online quickly.
【０００５】この場合の溶接は、図２に例示する如く切
断機（シャー）で薄板５の先端を切断した後、その先端
部を僅かに重ね合わせてクランプ１８で固定し、その重
合部分Ｄを上下の電極輪７Ａ，７Ｂで加圧しながら幅方
向に溶接することにより行われる。In the welding in this case, as shown in FIG. 2, the tip of the thin plate 5 is cut by a cutting machine (shear), and then the tips are slightly overlapped and fixed by a clamp 18, and the overlapped portion D is joined. This is performed by welding in the width direction while applying pressure with the upper and lower electrode wheels 7A and 7B.
【０００６】オンライン下での溶接部診断は、現状では
大半が、作業者がＡ点において溶接部分にハンマー等で
打撃を与えて、溶接部Ｋの変質が生じていないか何うか
を目視で判断する方法（以降、ハンマリング法という）
により行われており、このことは上記メッキライン以外
の薄板の連続処理プロセスにおいても同様である。At present, most of the on-line diagnosis of a welded portion is made by visually checking whether or not the welded portion K is degraded by the operator hitting the welded portion at point A with a hammer or the like. Method (hereinafter referred to as hammering method)
This is the same in the continuous processing of thin plates other than the above-mentioned plating line.
【０００７】一方、図３に概要示する如く、所謂エリク
セン試験法を適用した溶接部診断法がある。この診断法
は、溶接条件を設定するために溶接部分を切り取り、該
溶接部分に治具を当て力を加えて変形させ、破断Ｅが生
じるか否かを見分けるものである。しかし、本この方法
はオンライン下では使用不可能である。On the other hand, as schematically shown in FIG. 3, there is a welded part diagnostic method to which a so-called Erichsen test method is applied. In this diagnostic method, a welding portion is cut out to set welding conditions, a jig is applied to the welding portion to deform the portion, and it is determined whether or not a fracture E occurs. However, this method cannot be used online.
【０００８】[0008]
【発明が解決しようとする課題】前記従来のハンマリン
グ法は一種の破壊試験であって、，正常な溶接部に変
形を与えてしまうこと、，当然ながら省力化を阻害す
ること、，実際には全面に至る精密な診断は行い難い
こと、，定量的な評価が行えないこと、，ライン停
止時間が長くなること等の諸問題点が依然として残って
いる。The above-mentioned conventional hammering method is a kind of destructive test, in which a normal welded portion is deformed, and of course, the labor saving is hindered. However, there still remain problems such as difficulty in performing a precise diagnosis over the entire surface, inability to perform a quantitative evaluation, and prolonging a line stop time.
【０００９】溶接部の健全性診断に際して、特に必要な
のは溶接部の引張強度であり、この値が十分であれば薄
鋼板の連続処理プロセス内での溶接部不良による不具合
は発生しない。しかしながら現状はこの強度を溶接直後
に定量化させる手段は未だに実用化されていない。In the diagnosis of the soundness of the welded portion, particularly necessary is the tensile strength of the welded portion. If this value is sufficient, no problem occurs due to the welded portion failure in the continuous processing of thin steel sheets. However, at present, means for quantifying this strength immediately after welding has not yet been put to practical use.
【００１０】本発明は、このような問題点の解消を図る
ために成されたものであり、本発明の目的は、前記の如
き問題点を解消し、溶接を続けながらオンライン下でそ
の直後において即座に非破壊、非接触方式で溶接部分の
健全性評価を可能とし、更には接触媒体が不要であって
溶接部急冷による変質の不具合を招かず、しかも簡単な
構造で行えて実用性に優れると共に汎用に適する薄板の
溶接部評価方法を提供しようとすることにある。SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and an object of the present invention is to solve the above-mentioned problems and to carry out welding immediately after on-line while continuing welding. Immediate non-destructive, non-contact evaluation of the integrity of the welded part is possible, and no contact medium is required, which does not cause deterioration of the welded part due to rapid cooling. It is another object of the present invention to provide a method for evaluating a welded portion of a thin plate suitable for general use.
【００１１】[0011]
【課題を解決するための手段】本発明は、上記の目的を
達成するため以下に述べる構成としたものである。即
ち、本発明は、薄板の連続処理プロセスのオンライン下
におけるシーム溶接工程での溶接部分の溶接の完全性お
よび接着状況を評価する方法であって、薄板の連続処理
プロセスのオンライン下におけるシーム溶接工程での溶
接部分の溶接の完全性および接着状況を評価する方法で
あって、溶接部の周辺に固体撮像素子カメラを配設し
て、薄板の幅方向に形成された溶接線の変色部の幅を複
数個所において測定し、その測定結果（Ｗ 1, Ｗ 2, Ｗ 3, …
… , Ｗ n ）より得られる溶接部表面上の変色幅の平均値
Ｗ ave とその適正値であるＷ c との差の大きさＳ＝｜Ｗ
c −Ｗ ave ｜を算出するとともに、変色幅の標準偏差σ
を算出して、両算出値に基づいて得られる評価関数値Ｆ
（Ｗ）＝Ａ 1 ×｜Ｗ c −Ｗ ave ｜＋Ａ 2 ×σ，但し、Ａ
1 ,Ａ 2 は係数、の大きさより、溶接部の引張強度を推定
することを特徴とする薄板の溶接部評価方法である。The present invention has the following configuration to achieve the above object. That is, the present invention is a method for evaluating the welding integrity and adhesion of a welded portion in a seam welding step under an on-line process of a continuous sheet processing process, comprising the steps of: A method for evaluating the welding integrity and adhesion of a welded portion at a position where a solid-state imaging device camera is disposed around the welded portion and the width of the discolored portion of the welding line formed in the width direction of the thin plate. Duplicate
Measurements were taken at several locations, and the measurement results (W1 , W2 , W3 , ...)
… , W n ), the average value of the discoloration width on the weld surface obtained from
W ave and magnitude of the difference between the a proper value W c S = | W
c− W ave | and the standard deviation σ of the color change width
Is calculated, and an evaluation function value F obtained based on both the calculated values is calculated.
(W) = A 1 × | W c −W ave | + A 2 × σ, where A
1, A 2 is a coefficient, than the size of a weld evaluation method of the sheet, characterized in that estimating the tensile strength of the weld.
【００１２】[0012]
【作用】図４に溶接部表面の変色状況が示される。適正
な変色幅を呈していて鋼板の幅方向の溶接線が直線的に
変化していれば、正常な溶接とみなすことができる。こ
れに対して、不完全な溶接部は適正な変色幅が得られて
いない、あるいは溶接線が乱れているときに発生するこ
とが判っている。一方、これらの変色状況は接合部での
発熱状況に関係があるものである。FIG. 4 shows the discoloration of the surface of the weld. If the width of the welding line in the width direction of the steel sheet changes linearly while exhibiting an appropriate discoloration width, it can be regarded as normal welding. On the other hand, it has been found that incomplete welds occur when an appropriate discoloration width is not obtained or when a weld line is disturbed. On the other hand, these discoloration states are related to the heat generation state at the joint.
【００１３】例えばナローラップシーム溶接機等の抵抗
溶接機はその電極に高電流を通電させて溶接を行ってい
ることに着目すると、不完全溶接部の変色状況は、正常
な溶接部表面変色状況に対して異なる状態で現れるもの
であって、その発生要因としては、接合部でのジュール
熱の発生状況に起因していることが判る。例えば、図５
に示すように、鋼板間の接触抵抗（ｒ1,ｒ3,ｒ5 ）と内
部抵抗（ｒ2,ｒ4 ）によるジュール熱が十分発生し接合
内部が溶融状態になると適正な熱影響部が得られ、表面
の変色状況も安定しているが、電極と鋼板の間の接触抵
抗（ｒ1,ｒ5 ）によるジュール熱が大きいと、接合内部
に十分な熱影響部を得ることができず、、また、溶接時
に火花が多く発生し、表面の変色状況も乱れてくるので
ある。Focusing on the fact that a resistance welding machine such as a narrow lap seam welding machine conducts welding by applying a high current to its electrode, the discoloration of an incompletely welded portion is considered to be the normal discoloration of the surface of the welded portion. It appears that the Joule heat appears in a different state, and the cause of the occurrence is due to the generation of Joule heat at the joint. For example, FIG.
As shown in, the contact resistance (r 1, r 3, r 5) an adequate heat affected zone when Joule heat is sufficiently generated by joining the interior becomes a molten state due to the internal resistance (r 2, r 4) between steel sheet the resulting, is stable discoloration condition of the surface, the Joule heat due to contact resistance between the electrode and the steel sheet (r 1, r 5) is large, it is impossible to obtain a sufficient heat-affected zone on the inner joining Also, many sparks are generated during welding, and the discoloration of the surface is disturbed.
【００１４】一方、接合部の強度の問題については、溶
接サンプルの引張試験結果から判断すると、適正な変色
幅に対し実際の幅が狭くなっているサンプル接合部の引
張強度は、所望の引張強度に比べて相当低くなっている
ことが明らかである。従って、本発明においては、溶接
部表面変色状況を光電変換的に観察して、測定結果より
得られる溶接部表面上の変色幅の平均値Ｗ ave とその適
正値であるＷ c との差の大きさＳ＝｜Ｗ c −Ｗ ave ｜
と、変色幅の標準偏差σとが接合部での発熱状況に影響
される因子であることを知見し、この両因子に基づいて
前記評価関数値Ｆ（Ｗ）を演算してその大きさから所定
の入熱量が接合部で発生しているかどうかを定量的に判
断し得るに至ったものであって、これにより溶接部の引
張強度をより正確に推定することが可能になる。On the other hand, regarding the problem of the strength of the joint, judging from the result of the tensile test of the welded sample, the tensile strength of the sample joint where the actual width is narrower than the appropriate discoloration width is equal to the desired tensile strength. It is clear that it is considerably lower than that of . Therefore, Oite the present invention, by observing the weld surface discolouration situation photoelectric conversion, the more measurement results
The average value of the discoloration width W ave on the weld surface obtained and its
Magnitude of the difference between W c is a positive value S = | W c -W ave |
And the standard deviation σ of the color change width affect the heat generation state at the joint.
Is known to be a factor that is
If a predetermined amount of heat input from the magnitude occurs at the junction be those that led to be quantitatively determine <br/> cross by calculating the evaluation function value F (W), which it is possible to ing to estimate the tensile strength of the welded portion more accurately by.
【００１５】[0015]
【実施例】以下、本発明の実施例について添付図面を参
照しながら説明する。本発明方法の実施例に係るナロー
ラップシーム溶接工程の概要が図６に斜視図で示され
る。ナローラップシーム溶接機は、本体のハウジング６
に関連して上下一対の電極輪７Ａ，７Ｂで実現される溶
接用電極がそれぞれ取付けられている。この電極輪７
Ａ，７Ｂに対して後方位置のハウジング６には、ＣＣＤ
カメラ８で実現される固体撮像素子カメラと蛍光灯９で
実現される照明器とが取り付けられ、それらは入射光
軸、照射光軸が、電極輪７Ａ，７Ｂの接触個所の後方50
〜200mm の溶接線上を指向するようにそれぞれ設けられ
る。この場合、ＣＣＤカメラ８は視野を15〜40mm程度に
とり、画素数は1024〜5000画素（主として2048画素で使
用）とし、照明の波長は約200 〜1000nmの範囲で使用で
きるが、図示例では700 nm付近の波長の照明を使用して
いる。一方、図示しないが溶接部倣い機構全体は、基礎
をハウジング６からとって、その移動は電極輪７Ａ，７
Ｂに同期させるようにしている。Embodiments of the present invention will be described below with reference to the accompanying drawings. The outline of the narrow lap seam welding process according to the embodiment of the method of the present invention is shown in a perspective view in FIG. The narrow lap seam welding machine has a housing 6 of the main body.
In addition, welding electrodes realized by a pair of upper and lower electrode wheels 7A and 7B are respectively attached. This electrode wheel 7
The housing 6 at the rear position with respect to A and 7B has a CCD
A solid-state image pickup device camera realized by the camera 8 and an illuminator realized by the fluorescent lamp 9 are mounted, and their incident optical axis and irradiation optical axis are set at a position 50 behind the contact point between the electrode wheels 7A and 7B.
Each is provided so as to point on the welding line of ~ 200mm. In this case, the CCD camera 8 has a field of view of about 15 to 40 mm, the number of pixels is 1024 to 5000 pixels (mainly used for 2048 pixels), and the illumination wavelength can be used in the range of about 200 to 1000 nm. Illumination with a wavelength near nm is used. On the other hand, although not shown, the entire welding portion copying mechanism takes the foundation from the housing 6 and moves the electrode wheels 7A, 7A.
B.
【００１６】このように構成される実施例は、ＣＣＤカ
メラ８と蛍光灯９とを作動させることによって、鋼板５
を板幅方向に溶接する７Ａ，７Ｂの後方をＣＣＤカメラ
８が追従しながら、溶接部の表面の変色した皮膜域を光
電変換的に検出し、例えばマイクロプロセッサで実現さ
れる制御装置によってその幅（板の長手方向）の抽出を
行い、接合部の引張強度を推定することができる。図７
に、ＣＣＤカメラ８によって得られる出力信号に基づい
て溶接部の評価を行う方法が示される。溶接部表面の変
色域「イ」と出力波形「ロ」とから判るように、変色し
た幅だけ明るさが落ちている。こうして得られたＣＣＤ
カメラ８からの信号をもとに、例えば鋼板５の幅方向に
形成された溶接線幅（変色部）のｎ個所の測定結果（Ｗ
1,Ｗ2,Ｗ3,……, Ｗn ）より得られる溶接部表面上の変
色幅の平均値Ｗave とその適正値であるＷc との差の大
きさＳ＝｜Ｗc −Ｗave ｜を算出し、また、変色幅の標
準偏差σを算出して、さらにこれら接合部での発熱状況
に影響する因子に係数Ａ1、Ａ2 を乗じた値を加算して
得られる評価関数値Ｆ（Ｗ）（下記式 (1)で求められ
る）、 Ｆ（Ｗ）＝Ａ1 ×｜Ｗc −Ｗave ｜＋Ａ2 ×σ ……… (1) の大きさから、溶接部の引張強度を推定するものであ
る。ここで、変色幅の平均値Ｗave 及び標準偏差σは下
記式 (2),(3)によって求められる。 Ｗave ＝ 1/n（Ｗ1 ＋Ｗ2 ＋………＋Ｗn ） ……… (2) σ＝〔 1/n｛( Ｗ1 −Ｗave ）2 ＋（Ｗ2 −Ｗave ）2 ＋… ……( Ｗn −Ｗave ）2 ｝〕1/2 ……… (3)The embodiment constructed as described above operates the CCD camera 8 and the fluorescent lamp 9 to operate the steel plate 5.
While the CCD camera 8 follows behind 7A and 7B which are welded in the width direction of the plate, the discolored film area on the surface of the welded portion is photoelectrically detected, and the width is detected by a control device realized by, for example, a microprocessor. By extracting (the longitudinal direction of the plate), the tensile strength of the joint can be estimated. FIG.
FIG. 5 shows a method for evaluating a welded portion based on an output signal obtained by the CCD camera 8. As can be seen from the discolored area “a” on the welded surface and the output waveform “b”, the brightness has decreased by the discolored width. CCD thus obtained
Based on the signal from the camera 8, for example, a measurement result (W) of n places of the welding line width (discolored portion) formed in the width direction of the steel plate 5
1, W 2, W 3, ......, the magnitude of the difference W n) than the average value W ave discoloration width of the welded portion on the surface obtained and its a proper value W c S = | W c -W ave | is calculated, and the standard deviation σ of the color change width is calculated. Further, an evaluation function obtained by adding a value obtained by multiplying the factors affecting the heat generation state at these joints by the coefficients A 1 and A 2 is obtained. the value F (W) (obtained by the following formula (1)), F (W ) = a 1 × | W c -W ave | from + a 2 × σ ......... magnitude of (1), welding portion of It is for estimating the tensile strength. Here, the average value Wave and the standard deviation σ of the color change width are obtained by the following equations (2) and (3). W ave = 1 / n (W 1 + W 2 +... + W n ) (2) σ = [1 / n ｛(W 1 −W ave ) 2 + (W 2 −W ave ) 2 +. …… (W n −W ave ) 2 ｝] 1/2 ……… (3)
【００１７】なお、溶接部の発熱状況を種々変えて溶接
サンプルを作成し、引張試験を実施してみたところ、そ
の時の結果で評価関数Ｆ（Ｗ）と引張強度の関係を示す
と図８の通りである。図８において、○符号で示した値
は演算結果の評価関数Ｆ（Ｗ）に対する引張強度の実測
値であって、この実測結果から実線曲線のような関係線
図が得られる。この線図から判ることは、Ｆ（Ｗ）の値
が小さい程溶接状態が良く、或る値以下になると最良状
態で安定すると言う点である。このようにして、ＣＣＤ
カメラ８からの信号をもとに溶接部の引張強度を推定す
ることが可能であるので、評価関数Ｆ（Ｗ）が設定値と
比較して小さければそのまま通板すれば良く、一方、大
きければ溶接部で破断のおそれがあるため減速あるいは
停止してシーム溶接の再処理を行うなど適切な処置をと
ることが可能である。A welding sample was prepared by changing the heat generation state of the welded portion in various ways, and a tensile test was performed. The relationship between the evaluation function F (W) and the tensile strength is shown in FIG. It is on the street. In FIG. 8, the value indicated by the symbol 実 is a measured value of the tensile strength with respect to the evaluation function F (W) of the calculation result, and a relation diagram such as a solid curve is obtained from the measured result. It can be seen from this diagram that the smaller the value of F (W), the better the welding condition.
It is said that it is stable in a state . In this way, the CCD
Since it is possible to estimate the tensile strength of the welded portion based on the signal from the camera 8, if the evaluation function F (W) is smaller than the set value, it is sufficient to pass the plate as it is. Since there is a risk of fracture at the welded portion, it is possible to take an appropriate measure such as performing reprocessing of seam welding by decelerating or stopping the welding.
【００１８】[0018]
【発明の効果】以上述べたように本発明によれば、溶接
を続けながらオンライン下でその直後に即座に非破壊、
非接触方式で溶接部分の引張強度を迅速、かつ的確に評
価することができる。更に、溶接部の健全性を引張強度
という定量的な値に置換して評価できるので、溶接良否
の判断基準を統一することが可能である。As described above, according to the present invention, immediately after non-destruction immediately after being online while continuing welding,
The non-contact method enables quick and accurate evaluation of the tensile strength of the welded portion. Further, since the soundness of the welded portion can be evaluated by replacing it with a quantitative value called tensile strength, it is possible to unify the criteria for judging the quality of welding.
【図１】連続溶融亜鉛めっきラインの工程概要図であ
る。FIG. 1 is a process schematic diagram of a continuous hot-dip galvanizing line.
【図２】図１に示すライン中の溶接工程における溶接状
況を説明するために、鋼板重ね合せ部、接合部の断面と
併せて示す説明図である。FIG. 2 is an explanatory diagram showing a welding state in a welding process in a line shown in FIG. 1 together with a cross section of a steel sheet overlapping portion and a joining portion.
【図３】溶接部の耐破断性評価のためのエリクセン試験
法の順序的説明図である。FIG. 3 is a sequential explanatory view of the Erichsen test method for evaluating the fracture resistance of a weld.
【図４】シーム溶接工程での薄鋼板の溶接部の態様を説
明する平面図である。FIG. 4 is a plan view illustrating an aspect of a welded portion of a thin steel plate in a seam welding process.
【図５】抵抗溶接機の溶接原理の模式図である。FIG. 5 is a schematic view of the welding principle of a resistance welding machine.
【図６】本発明方法の実施例に係るナローラップシーム
溶接工程の概要を示す斜視図である。FIG. 6 is a perspective view showing an outline of a narrow lap seam welding step according to the embodiment of the method of the present invention.
【図７】本発明評価方法の概念図である。FIG. 7 is a conceptual diagram of the evaluation method of the present invention.
【図８】本発明評価方法に係る評価関数と溶接部引張強
度の関係を示す線図である。FIG. 8 is a diagram showing a relationship between an evaluation function and a tensile strength of a welded portion according to the evaluation method of the present invention.
５…鋼板 ７Ａ，７Ｂ…溶接用電極輪 ８…ＣＣＤカメラ ９…蛍光灯 Ｋ…溶接部 5 ... Steel plate 7A, 7B ... Welding electrode ring 8 ... CCD camera 9 ... Fluorescent lamp K ... Welded part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中村 徹 兵庫県加古川市金沢町１番地 株式会社 神戸製鋼所 加古川製鉄所内 (56)参考文献 特開 平５−223788（ＪＰ，Ａ) 特開 平５−261557（ＪＰ，Ａ) 特開 平３−181847（ＪＰ，Ａ) 特開 平６−331565（ＪＰ，Ａ) 特開 平５−79990（ＪＰ，Ａ) 特開 平７−72098（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G01N 21/84 - 21/90 B23K 11/24 G06T 7/00────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Nakamura 1 Kanazawa-cho, Kakogawa-shi, Hyogo Kobe Steel, Ltd. Kakogawa Works (56) References JP-A-5-223788 (JP, A) JP-A-5 JP-A-261557 (JP, A) JP-A-3-181847 (JP, A) JP-A-6-331565 (JP, A) JP-A-5-79990 (JP, A) JP-A-7-72098 (JP, A) (58) Fields investigated (Int.Cl. 6 , DB name) G01N 21/84-21/90 B23K 11/24 G06T 7/00
Claims (1)
におけるシーム溶接工程での溶接部分の溶接の完全性お
よび接着状況を評価する方法であって、溶接部の周辺に
固体撮像素子カメラを配設して、薄板の幅方向に形成さ
れた溶接線の変色部の幅を複数個所において測定し、そ
の測定結果（Ｗ 1, Ｗ 2, Ｗ 3, …… , Ｗ n ）より得られる溶
接部表面上の変色幅の平均値Ｗ ave とその適正値である
Ｗ c との差の大きさＳ＝｜Ｗ c −Ｗ ave ｜を算出すると
ともに、変色幅の標準偏差σを算出して、両算出値に基
づいて得られる評価関数値Ｆ（Ｗ）＝Ａ 1 ×｜Ｗ c −Ｗ
ave ｜＋Ａ 2 ×σ，但し、Ａ 1 ,Ａ 2 は係数、の大きさよ
り、溶接部の引張強度を推定することを特徴とする薄板
の溶接部評価方法。1. A method for evaluating the welding integrity and adhesion of a welded portion in a seam welding process under an on-line process of a continuous sheet processing process, wherein a solid-state imaging device camera is provided around the welded portion. And formed in the width direction of the thin plate.
Measure the width of the discolored part of the weld line at
From the measurement results (W 1, W 2, W 3, ... , W n )
The average value of the discoloration width W ave on the contact surface and its appropriate value
W magnitude of the difference between c S = | calculating the | W c -W ave
In both cases, the standard deviation σ of the color change width is calculated, and based on both calculated values.
Evaluation function value F (W) = A 1 × | W c −W
ave | + A 2 × σ, where A 1 and A 2 are the magnitudes of the coefficients
And estimating the tensile strength of the welded portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6016535A JP2786806B2 (en) | 1994-02-10 | 1994-02-10 | Evaluation method for thin plate welds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6016535A JP2786806B2 (en) | 1994-02-10 | 1994-02-10 | Evaluation method for thin plate welds |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07225197A JPH07225197A (en) | 1995-08-22 |
| JP2786806B2 true JP2786806B2 (en) | 1998-08-13 |
Family
ID=11918968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6016535A Expired - Fee Related JP2786806B2 (en) | 1994-02-10 | 1994-02-10 | Evaluation method for thin plate welds |
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| Country | Link |
|---|---|
| JP (1) | JP2786806B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2923606B1 (en) * | 2007-11-09 | 2009-12-11 | Controle Des Points De Soudure | METHOD FOR NON-DESTRUCTIVE CONTROL OF A WELDING POINT |
| KR101481618B1 (en) * | 2013-09-03 | 2015-01-12 | 주식회사 포스코 | Apparatus and method for estimating welding quality of strip |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05223788A (en) * | 1992-02-12 | 1993-08-31 | Kobe Steel Ltd | Method for diagnosing soundness of weld on sheet |
| JPH05261557A (en) * | 1992-03-18 | 1993-10-12 | Daiwa Can Co Ltd | Device for deciding whether can body is welded adequately or not |
-
1994
- 1994-02-10 JP JP6016535A patent/JP2786806B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07225197A (en) | 1995-08-22 |
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