JPH01120325A - Method for inspecting welded part of electrofusion joint - Google Patents

Method for inspecting welded part of electrofusion joint

Info

Publication number
JPH01120325A
JPH01120325A JP62277773A JP27777387A JPH01120325A JP H01120325 A JPH01120325 A JP H01120325A JP 62277773 A JP62277773 A JP 62277773A JP 27777387 A JP27777387 A JP 27777387A JP H01120325 A JPH01120325 A JP H01120325A
Authority
JP
Japan
Prior art keywords
fusion
current
resistance value
completion
coil
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.)
Granted
Application number
JP62277773A
Other languages
Japanese (ja)
Other versions
JPH07121554B2 (en
Inventor
Takayuki Handa
半田　孝幸
Kazunori Mito
水戸　和憲
Masahiro Hirata
平田　正弘
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.)
Mitsui Petrochemical Industries Ltd
Original Assignee
Mitsui Petrochemical Industries 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 Mitsui Petrochemical Industries Ltd filed Critical Mitsui Petrochemical Industries Ltd
Priority to JP27777387A priority Critical patent/JPH07121554B2/en
Publication of JPH01120325A publication Critical patent/JPH01120325A/en
Publication of JPH07121554B2 publication Critical patent/JPH07121554B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91214—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods by measuring the electrical resistance of a resistive element belonging to one of the parts to be welded, said element acting, e.g. as a thermistor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91317—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the electrical resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value

Abstract

PURPOSE:To easily find out welding inferiority, by detecting whether an electric characteristic is abnormal from the current allowed to flow to an electric heating wire after the completion of welding work. CONSTITUTION:When a switch 4 is closed, a current flows from a high voltage source and the resistance value of a heating coil 2 is inputted to a control apparatus 3 and the kind of a pipe joint 1 is discriminated. Then, in order to apply the power quantity corresponding thereto to the coil 2, a variable resistor 5 is controlled. Simultaneously with the opening of the switch 4 after the completion of welding, the switch 6 on the side of a low voltage source is temporarily closed and a weak current is allowed to flow to the coil 2 for a short time. The resistance value of the coil 2 at this time is compared with a resistance value at a normal time by the control apparatus 3 and, when said value exceeds a normal range, an alarm circuit 8 is closed to emit an alarm. By this method, welding inferiority can be simply found out.

Description

【発明の詳細な説明】 産業上の利用分野 上下水道管やガス管などに使用されるプラスチック管の
管継手やサドル継手として近年、管との接触面に電熱線
を埋設し、管との融着を電熱線へ通電して接触面を加熱
溶融することにより行うエレクトロフュージョン継手が
使用され始めてきた。[Detailed description of the invention] In recent years, as pipe joints and saddle joints for plastic pipes used in industrial applications such as water supply and sewage pipes and gas pipes, heating wires are embedded in the contact surface with the pipes to achieve fusion with the pipes. Electrofusion joints have begun to be used, in which joints are bonded by applying electricity to a heating wire to heat and melt the contact surfaces.

本発明はカミる継手によって連結されたプラスチック管
との融着部分における融着不良を見付は出すための検査
方法に関する。The present invention relates to an inspection method for detecting fusion defects at a fusion joint with a plastic pipe connected by a snap joint.

従来技術 継手に通電する装置は従来手作業によって操作され、通
電される電力量は現場での作業者の判断により、すなわ
ち作業者が融着時における継手の外観より判断して決定
していたが、近年、継手のサイズや種類に応して予め付
与される電力量を設定しておき、作業者が継手の外観よ
りその種類を識別してそれに対応する電力量を付与する
方式が採用され始めてきた。また最近管継手に関し、管
継手の種類に応じて抵抗値の異なる抵抗器を加熱コイル
とは別に埋込んでおいてその抵抗値を検出するか或いは
加熱コイル自体の抵抗値を検出して管継手の種類を識別
し、それに相当する電力量の付与を行う方法も提案され
ている。いづれの方法によるにしても融着部分には、電
熱線の短絡や継手と管の接触不良或いは管継手の場合の
管の差込み不足等によって融着強度の低下や変形など融
着不良を来すことがある。Conventional technology Devices that energize joints have conventionally been operated manually, and the amount of power to be energized has been determined by the operator's judgment on site, that is, by the operator's judgment based on the appearance of the joint during welding. In recent years, a method has begun to be adopted in which the amount of power to be applied is set in advance according to the size and type of the joint, and the operator identifies the type from the appearance of the joint and applies the corresponding amount of power. came. In addition, recently, with regard to pipe joints, depending on the type of pipe joint, a resistor with a different resistance value is embedded separately from the heating coil and its resistance value is detected, or the resistance value of the heating coil itself is detected and the resistance value is detected. A method has also been proposed in which the type of power is identified and the corresponding amount of power is provided. Regardless of which method is used, fusion defects such as reduced fusion strength and deformation may occur at the fused portion due to short circuits in heating wires, poor contact between the fitting and pipe, or insufficient insertion of the pipe in the case of pipe fittings. Sometimes.

発明が解決しようとする問題点 上述するような融着不良は電力量の付与が作業者の判断
に委ねられる前者のマニュアル方式に比べ、後二者の方
式による場合ことに見逃され易く、そのま＼使用に供さ
れることが多い。Problems to be Solved by the Invention The above-mentioned fusion defects are more easily overlooked in the latter two methods than in the former manual method, in which the application of electric power is left to the operator's judgment, and is left as is. ＼Often offered for use.

本発明は融着不良を適確に見付は出し、融着不良を生じ
たま＼で使用されることがないようにしたものである。The present invention accurately detects defects in fusion and prevents the product from being used with defects in fusion.

問題点の解決手段 本発明はそのため融着作業完了時若しくは完了後電熱線
に流された電流より抵抗値や電流値などにおける電気特
性の異常の有無を検出し、融着不良を見付は出すように
したものである。Means for Solving Problems Therefore, the present invention detects the presence or absence of abnormalities in electrical characteristics such as resistance value and current value from the current passed through the heating wire at the time of completion of the fusion work or after completion of the fusion work, and detects fusion defects. This is how it was done.

電気特性の異常の有無を検出するための電流は、融着時
の電流か若しくは融着完了後に通電される電流が使用さ
れ、後者の融着完了後に通電される場合には、好ましく
は溶融時の電流よりも弱い電流が使用され、再加熱され
ないようにするのが望ましい。The current for detecting the presence or absence of an abnormality in electrical characteristics is a current during fusion or a current applied after completion of fusion. If the latter is applied after completion of fusion, it is preferable to use a current applied during fusion. It is desirable that a current weaker than the current used is used to avoid reheating.

電気特性の異常の有無は、抵抗計や電流計を作業者が目
視することによって判別することもできるが、好ましく
は異常があるとき警報音や警告灯などによって知ること
ができるようにするのが望ましい。The presence or absence of an abnormality in the electrical characteristics can be determined by the operator visually checking the resistance meter or ammeter, but it is preferable to make it possible to know when there is an abnormality by an alarm sound or a warning light. desirable.

作用 電熱線が短絡したときは抵抗値が下り、電流値が増大す
ることによって、継手と管の接触不良或いは管継手にお
いて管の差込み不足が生じたときには電熱線の加熱によ
る温度の上昇により抵抗値が上がり、電流値が低下する
ことによって融着部の異常が検出される。When the heating wire is short-circuited, the resistance value decreases and the current value increases, and when there is poor contact between the fitting and the pipe or the tube is not inserted properly at the pipe fitting, the resistance value decreases due to the temperature increase due to the heating of the heating wire. An abnormality in the fused portion is detected when the current value increases and the current value decreases.

実施例 図は管継手の例について示すもので、管継手１に埋設さ
れる加熱コイル２はその抵抗値が継手１の種類に応じて
異なるように、換言すれば加熱コイル２の抵抗値を検出
することによって管継手１の種類が識別できるようにな
っている。制御装置３には継手１の種類に対応する電力
量がプログラム化されて記憶してあり、制′ａ装置３に
よってコントロールされるスイッチ４を閉じ、高電圧源
側より電流が流れて加熱コイル２の抵抗値を図示しない
センサーによって読取り、それが制御装置３に入力され
ると、その入力値より管継手１の種類が識別され、それ
に対応する電力量を加熱コイル２に付与すべく可変抵抗
器５及びスイッチ４が制御されるようになっている。制
御装置３によってまた融着が完了してスイッチ４が開か
れると同時に或いはそれより若干遅れて低電圧源側のス
イッチ６が一時的に閉じられ、弱い電流が短時間加熱コ
イル２に流されるようになっており、その際の加熱コイ
ル２の抵抗値がセンサーによって読取られ、制御装置３
に入力されて正常時の抵抗値と比較され、正常な範囲を
越えるとき異常と判断されて警報ランプを点灯若しくは
警報音を発する警報回路８を閉じ、警報を発するように
しである。The example diagram shows an example of a pipe joint, and the resistance value of the heating coil 2 embedded in the pipe joint 1 varies depending on the type of the joint 1. In other words, the resistance value of the heating coil 2 is detected. By doing so, the type of pipe joint 1 can be identified. The amount of electric power corresponding to the type of joint 1 is programmed and stored in the control device 3. When the switch 4 controlled by the control device 3 is closed, current flows from the high voltage source side and the heating coil 2 is heated. When the resistance value of the pipe joint 1 is read by a sensor (not shown) and inputted to the control device 3, the type of the pipe joint 1 is identified based on the input value, and a variable resistor is activated to apply the corresponding amount of electric power to the heating coil 2. 5 and switch 4 are controlled. The control device 3 also temporarily closes the switch 6 on the low voltage source side as soon as the welding is completed and the switch 4 is opened, or slightly later, so that a weak current is passed through the heating coil 2 for a short time. The resistance value of the heating coil 2 at that time is read by the sensor, and the control device 3
When the resistance value exceeds the normal range, it is determined that there is an abnormality, and the alarm circuit 8, which lights up an alarm lamp or emits an alarm sound, is closed and an alarm is issued.

上記実施例では融着不良を検出するプログラムが電力量
を付与するプログラムに組込まれているが、別の実施例
では検出装置が別に設けられる。In the embodiment described above, a program for detecting defective fusion is incorporated into a program for applying electric power, but in another embodiment, a detection device is provided separately.

上記実施例ではまた加熱コイルへの通電により継手のサ
イズや種類が識別され、それに応じた電力量が付与され
るようになっているが、別のａ＋！では作業者が継手の
サイズや種類をその外観から識別し、それに対応する電
力量が付与されるように制御装置の操作を行い、他の態
様では融着作業が全て作業者の判断により行われ、融着
部の異常は融着゛後検出装置により行われる。In the above embodiment, the size and type of the joint are identified by energizing the heating coil, and the amount of electric power is applied accordingly. In this case, the worker identifies the size and type of the joint from its appearance and operates the control device to apply the corresponding amount of power. An abnormality in the fused portion is detected by a post-fusion detection device.

発明の効果 本発明は以上のように、融着完了時若しくは完７後に電
熱線の電気特性について異常の有無を検出し、融着不良
を見付は出すようにしたもので、異常の有無が融着完了
時以後−度の検出で判別できるようになっているため検
出用のプログラムが簡単となり、融着不良を簡単かつ確
実に見付は出すことができる。Effects of the Invention As described above, the present invention detects the presence or absence of an abnormality in the electrical characteristics of the heating wire at the time of completion of fusion or after completion of fusion, and detects failure of fusion. Since the degree of fusion can be determined after the completion of fusion, the detection program is simple, and defective fusion can be easily and reliably identified.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明方法で使用する制御装置の一例を示す概略図
である。 １・・管継手　　２・・加熱コイル ３・・制御装置　４．６・・スイッチ ５・・可変抵抗器　　８・・警報回路 出願人　　三井石油化学工業株式会社 代理人　弁理士　　佐　藤　晃　−The figure is a schematic diagram showing an example of a control device used in the method of the present invention. 1. Pipe joint 2. Heating coil 3. Control device 4. 6. Switch 5. Variable resistor 8. Alarm circuit Applicant Mitsui Petrochemical Industries Co., Ltd. Representative Patent Attorney Akira Sato -

Claims (4)

【特許請求の範囲】[Claims] （１）プラスチック管との接触面に電熱線を埋設したエ
レクトロフュージョン継手を使用し、電熱線への通電に
より接触面を加熱溶融することによって融着されるプラ
スチック管との融着部について、融着作業完了時若しく
はそれ以後に電熱線に流される電流から抵抗値や電流値
など電気特性の異常の有無を検出することによって融着
不良を見付け出すことを特徴とするエレクトロフュージ
ョン継手の融着部の検査方法(1) Using an electrofusion joint with a heating wire embedded in the contact surface with the plastic pipe, the fusion joint with the plastic pipe is fused by heating and melting the contact surface by applying electricity to the heating wire. A fusion part of an electrofusion joint characterized in that defective fusion is found by detecting the presence or absence of abnormalities in electrical characteristics such as resistance value and current value from the current flowing through the heating wire at the time of completion of the fusion work or after that. inspection method （２）融着完了時の電流により電気特性の異常の有無が
検出される特許請求の範囲第１項記載のエレクトロフュ
ージョン継手の融着部の検査方法(2) A method for inspecting a fused portion of an electrofusion joint according to claim 1, wherein the presence or absence of an abnormality in electrical characteristics is detected by the current when fusion is completed. （３）融着完了後溶融時の電流よりも弱い電流を流すこ
とにより電気特性の異常の有無が検出される特許請求の
範囲第１項記載のエレクトロフュージョン継手の融着部
の検査方法(3) A method for inspecting a fused portion of an electrofusion joint according to claim 1, wherein the presence or absence of an abnormality in electrical characteristics is detected by passing a current weaker than the current during melting after completion of fusion. （４）電気特性の異常の有無は警報音や警告灯などによ
って表示される特許請求の範囲第１項記載のエレクトロ
フュージョン継手の融着部の検査方法(4) A method for inspecting a fused portion of an electrofusion joint according to claim 1, in which the presence or absence of an abnormality in electrical characteristics is indicated by an alarm sound, a warning light, etc.
JP27777387A 1987-11-02 1987-11-02 Inspection method for fused part of electrofusion joint Expired - Lifetime JPH07121554B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27777387A JPH07121554B2 (en) 1987-11-02 1987-11-02 Inspection method for fused part of electrofusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27777387A JPH07121554B2 (en) 1987-11-02 1987-11-02 Inspection method for fused part of electrofusion joint

Publications (2)

Publication Number Publication Date
JPH01120325A true JPH01120325A (en) 1989-05-12
JPH07121554B2 JPH07121554B2 (en) 1995-12-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02130131A (en) * 1988-11-11 1990-05-18 Nkk Corp Abnormality discrimination method and apparatus in electric welding method
JPH03128450A (en) * 1989-10-12 1991-05-31 Matsushita Electric Ind Co Ltd Method and device for detecting electric welding abnormality of thermoplastic tube joint

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62116128A (en) * 1985-09-12 1987-05-27 フュージョン、グループ、パブリック、リミテッド、カンパニー Method and device for detecting abnormality in electric fusion welding method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62116128A (en) * 1985-09-12 1987-05-27 フュージョン、グループ、パブリック、リミテッド、カンパニー Method and device for detecting abnormality in electric fusion welding method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02130131A (en) * 1988-11-11 1990-05-18 Nkk Corp Abnormality discrimination method and apparatus in electric welding method
JPH0577496B2 (en) * 1988-11-11 1993-10-26 Nippon Kokan Kk
JPH03128450A (en) * 1989-10-12 1991-05-31 Matsushita Electric Ind Co Ltd Method and device for detecting electric welding abnormality of thermoplastic tube joint

Also Published As

Publication number Publication date
JPH07121554B2 (en) 1995-12-25

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