JPS6114083A - Welding state monitoring method - Google Patents
Welding state monitoring methodInfo
- Publication number
- JPS6114083A JPS6114083A JP13632484A JP13632484A JPS6114083A JP S6114083 A JPS6114083 A JP S6114083A JP 13632484 A JP13632484 A JP 13632484A JP 13632484 A JP13632484 A JP 13632484A JP S6114083 A JPS6114083 A JP S6114083A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- sound pressure
- acoustic signal
- pressure level
- sound
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
- B23K9/0956—Monitoring or automatic control of welding parameters using sensing means, e.g. optical
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は1例えば鋼構造物を製造する際に使用される
ガスシールド溶接法において、その溶接状態を監視する
溶接状況監視方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a welding condition monitoring method for monitoring the welding condition in a gas shield welding method used, for example, in manufacturing steel structures.
例えばTIG、MIG (MAG)、Co!溶接等のガ
スシールド溶接法は、高能率、高品質な溶接法として一
般に普及し、化学機械、製鉄。For example, TIG, MIG (MAG), Co! Gas shield welding methods such as welding have become popular as a highly efficient and high quality welding method, and are used in chemical machinery and steel manufacturing.
鉄鋼構造物、船舶および海洋構造物等の鋼構造物の製造
に多用されている。これらのガスシールド溶接法を施工
する重要な技術的ポイントの一つとして、溶接部の7−
ルド性があげられ。It is widely used in the manufacture of steel structures such as steel structures, ships, and offshore structures. One of the important technical points in implementing these gas shield welding methods is the 7-
It has a rudo nature.
このシールド性は、溶接品質の良否に大きな影響を及ぼ
している。すなわちシールドガス不足。This shielding performance has a great influence on the quality of welding. In other words, there is a shortage of shielding gas.
ガス供給系の異常または周囲からの強風等、何らかの原
因で溶接部のシールド性(ガスによる溶接部の大気から
の遮閉)が損われると、溶接自体が不安定となる。これ
により、溶接現象に異常をきたすと共に、溶接部にはブ
ローホール等の欠陥が生じる状態となり、溶接品質な劣
化させている。このため、このガスシールド溶接法は、
屋外作業では余り採用されず、専ら工場内作業に限られ
ている0
発明が解決しようとする問題点〕
しかしこの工場内作業においても、夏季の扇風機による
ガスシールドの乱れ、および溶接ノズルへのスパッタ付
着によるシールド系路の詰り等により、しばしば溶接部
にシールド異常が生じ、溶接品質に悪影響を与えるケー
スが多々ある。このようなシールド性低下による溶接品
質劣化の防止対策として、シールドガスの供給系に設け
た流量計にてガス流量′の変化をチェックしたり、溶接
中断時に上記溶接ノズルを清掃する等の手段が考えられ
ているが、これらの手段線、何れの場合も溶接作業中に
常時性なうことのできるものではない。If the shielding properties of the welded part (the gas shielding the welded part from the atmosphere) are impaired for some reason, such as an abnormality in the gas supply system or strong winds from the surrounding area, the welding itself becomes unstable. This causes an abnormal welding phenomenon and causes defects such as blowholes to occur in the welded portion, deteriorating the welding quality. For this reason, this gas shield welding method
Problems that the invention aims to solve] However, even in this factory work, the gas shield is disturbed by the electric fan in the summer, and spatter on the welding nozzle. There are many cases in which shielding abnormalities occur at welded parts due to clogging of the shielding system path due to adhesion, which adversely affects welding quality. As measures to prevent deterioration of welding quality due to such deterioration of shielding performance, measures such as checking changes in gas flow rate' with a flow meter installed in the shielding gas supply system and cleaning the welding nozzle mentioned above when welding is interrupted are available. However, none of these methods can be used constantly during welding operations.
したがって、この発明は上記のような問題点に鑑みなさ
れたもので1例えば溶接部にシールド異常が生じた場合
でも、溶接部に欠陥が生じることなく、溶接品質の劣化
を未然に防止することができるようになる溶接状況監視
方法を提供することを目的とする。Therefore, the present invention was made in view of the above-mentioned problems.1 For example, even if a shield abnormality occurs in a welded part, the welded part will not be defective and deterioration of welding quality can be prevented. The purpose of the present invention is to provide a welding status monitoring method that enables the following.
すなわちこの発明に係る溶接状況監視方法は、溶接部か
ら発生する音(以下アーク音と称す)が溶接現象と密接
な関係にあることに着目して。That is, the welding status monitoring method according to the present invention focuses on the fact that the sound generated from the welding part (hereinafter referred to as arc sound) is closely related to the welding phenomenon.
溶接アーク音は溶接電流や電圧の変動等に伴うアーク柱
の振動によって生じるが、溶接部の7−ルド状況が異な
ってもアーク音は確実に変化することを見い出し、溶接
時に発生する音響信号を入力する手段と、この入力手段
により入力される音響信号の音圧レベルと予め記憶名れ
る安定溶接時における音響信号の音圧レベルとを比較す
る手段とを具備し、この比較手段により比較されるそれ
ぞれの溶接時の音圧レベルの差に応じて溶接状態の良否
判定を行なうようにするものである。Welding arc noise is caused by the vibration of the arc column due to fluctuations in welding current and voltage, but we have discovered that the arc sound changes reliably even if the welding conditions differ, and we have developed an acoustic signal generated during welding. and means for comparing the sound pressure level of the acoustic signal inputted by the inputting means with the sound pressure level of the acoustic signal during stable welding which is stored in advance, and the comparing means compares the sound pressure level of the acoustic signal during stable welding. The quality of the welding condition is determined based on the difference in sound pressure level during each welding process.
つまり、溶接作業中に溶接部から発生するアーク音を音
センサ(特定の音特性を感知するマイクロホン等)で検
知することにより、溶接部のシールド状況を常時チェッ
ク判定して溶接品質への悪影響を未然に(最小限で)防
止するものである。In other words, by detecting the arc sound generated from the welding part during welding work using a sound sensor (such as a microphone that detects specific sound characteristics), the shielding status of the welding part can be constantly checked and judged to prevent any negative effects on welding quality. It is something that can be prevented (at a minimum).
〔実施例〕゛。[Example]゛.
以下図面によりこの発明の一実施例を説明する0
W、1図はこの監視方法を実施する際に必要と溶接物1
2をガスシールドアーク溶接法にて溶接する際に使用さ
れるもので、このトーチ1ノ付近にはマイクロホン13
を設置する。このマイクロホン13は破線で囲んで示す
ような溶接部12mから発生する溶接アーク音(音響信
号)を入力検知するもので、このマイクロホン13から
の音響電気信号を増幅器(AMP)14を介して増幅し
帯域透過フィルタCB、P、F、) 15a〜16c
に供給する。このフィルタ15a〜15cは、上記溶接
アーク音に対応する帯域の音響信号のみ通過させ、その
他の雑音信号等を除去するもので、この帯域透過フィル
タ15a〜15Cを通過した音響信号を音圧レベル計1
6を介して比較回路12に供給する。この比較回路17
は、上記マイクロホン13で入力される音響信号の音圧
値または音圧変動値と、予め記憶設定される安定溶接状
態における基準音圧値または許容音圧変動値とを比較し
、その比較差に応じて溶接状態(シールド性)の良否判
定を行なうもので、この比較回路17による否判定時に
対応して表示装置18および警報装置19に作動信号を
供給する。この表示装置18および警報装置19は1例
えば溶接部12mにおける溶接状態良否の表示およびシ
ールド性低下等の警報を行なうものである。ここで、第
2図は溶接g12 aから発生される溶接アーク音の音
圧分布を□示すもので、範囲Aで示す音圧レベル2人を
安定溶・接状態における音圧レベルとすれば、上記比較
回路17VCおけ、:)基準音圧値および許容音圧変動
値は1例え4ばそれぞれ同範囲入における音圧レベルF
A および範囲Bに示す音圧変動幅PKとする。An embodiment of the present invention will be explained below with reference to the drawings.
2 is used when welding torch 1 using the gas-shielded arc welding method, and a microphone 13 is installed near the torch 1.
Set up. This microphone 13 inputs and detects the welding arc sound (acoustic signal) generated from the welding part 12m as shown surrounded by a broken line.The acoustic electrical signal from this microphone 13 is amplified via an amplifier (AMP) 14. Band pass filter CB, P, F,) 15a to 16c
supply to. These filters 15a to 15c pass only the acoustic signals in the band corresponding to the welding arc sound and remove other noise signals. 1
6 to the comparator circuit 12. This comparison circuit 17
compares the sound pressure value or sound pressure fluctuation value of the acoustic signal inputted by the microphone 13 with a reference sound pressure value or allowable sound pressure fluctuation value in a stable welding state that is stored and set in advance, and calculates the difference between the two. Accordingly, the quality of the welding state (shielding property) is determined, and an activation signal is supplied to the display device 18 and the alarm device 19 in response to the determination made by the comparison circuit 17. The display device 18 and the alarm device 19 are used to display, for example, whether the welding condition of the welded portion 12m is good or bad, and to issue an alarm such as a decrease in shielding performance. Here, Fig. 2 shows the sound pressure distribution of the welding arc sound generated from welding g12a, and if the sound pressure level shown in range A for two people is taken as the sound pressure level in a stable welding/welding state, In the above comparison circuit 17VC, :) The reference sound pressure value and the allowable sound pressure fluctuation value are 1. For example, if 4, the sound pressure level F in the same range.
The sound pressure fluctuation range PK shown in A and range B is assumed.
すなわちこのよりに構成した装置を使用して溶接作業の
監視を行なうには、まず、実施したい溶接条件を設定し
た時点での、安定(良好)な溶接状態における溶接アー
ク音の音圧レベルFAを、予め基準音圧値として比較回
路17に記憶名せる。これと共に、上記安定溶接状態に
゛おける音圧レベルFAに基づいて音圧変動幅PKも許
容音圧変動値として設定記憶名せる。この場合、上記基
準音圧レベルPi および許容音圧変動幅PKは、予め
多種類の溶接条件を設定して実験的に求め、対応するデ
ータを記憶名せてもよいし、また、安定な溶接状態が維
持された実際の音圧データを記憶名せてもよい。In other words, in order to monitor welding work using a device configured in this way, first, the sound pressure level FA of the welding arc sound under stable (good) welding conditions is determined at the time when the desired welding conditions are set. , is stored in the comparison circuit 17 in advance as a reference sound pressure value. At the same time, the sound pressure fluctuation range PK is also set and stored as an allowable sound pressure fluctuation value based on the sound pressure level FA in the stable welding state. In this case, the reference sound pressure level Pi and the permissible sound pressure fluctuation range PK may be determined experimentally by setting various welding conditions in advance, and the corresponding data may be stored and named. Actual sound pressure data whose state is maintained may be stored.
次に、溶接作業を開始し、溶接部12mから発生する音
響信号をマイクロホン13により入力検知する。これに
より、比較回路17では上記予め記憶した音圧値2人
および音圧幅PK と現在入力中の溶接音圧レベルとが
常時比較されるようになる。ここで1例えばシールドガ
ス系路の詰りゃガスボンベの圧力不足またはガスの減少
等の原因により、溶接部12mに対するシールドガスの
供給量が不足した場合には、溶接512mに発生するア
ーク音と共にその音響信号が減少するようになる。この
場合、比較回路17に供給される音圧信号値は、上記予
め設定記憶した基準音圧レベル2人 を大きく゛下回る
ようになり、この比較回路17ではその音圧レベルの差
から溶接状態の悪化りを判定するようになる。これによ
り1表示装置18は現在の溶接状況の悪化を表示し、t
た、警報装置19はシールドガス供給量の不足により溶
接部12mのシールド性が低下したことを警報するよう
になる0
また1例えば被溶接部12の周囲からの強風等の原因に
より、溶接部12mにおけるシールドガス層が乱されそ
のシールド性が低下した場合には、溶接部12mに発生
するアーク音は大小不安定となり、その音響信号は大き
く変動し振幅するようになる。この場合、比較回路17
に供給される音圧信号値は、上記予め設定記憶した許容
音圧変動幅PK を上回る幅で変動する!151c′″
0・′″of′t″517″′1“Of−。Next, welding work is started, and an acoustic signal generated from the welding part 12m is input and detected by the microphone 13. As a result, the comparator circuit 17 uses the pre-stored sound pressure value for two people.
The sound pressure width PK and the currently input welding sound pressure level are constantly compared. 1. For example, if the amount of shielding gas supplied to the welding section 12m is insufficient due to a blockage in the shielding gas line, insufficient pressure in the gas cylinder, or a decrease in gas, the arc sound and the sound generated at the welding section 12m will be The signal will start to decrease. In this case, the sound pressure signal value supplied to the comparator circuit 17 becomes much lower than the reference sound pressure level for the two people previously set and stored, and the comparator circuit 17 determines the welding state based on the difference in sound pressure levels. Become able to judge deterioration. As a result, the first display device 18 displays the deterioration of the current welding situation, and
In addition, the alarm device 19 warns that the shielding performance of the welded part 12m has deteriorated due to insufficient supply of shielding gas. If the shielding gas layer is disturbed and its shielding performance is reduced, the arc sound generated in the welding portion 12m becomes unstable in magnitude, and the acoustic signal thereof greatly fluctuates and amplitudes. In this case, the comparison circuit 17
The sound pressure signal value supplied to the unit fluctuates within a range exceeding the permissible sound pressure fluctuation range PK set and stored in advance! 151c''
0・′″of′t″517″′1″Of−.
勤レベルの差から溶接状態の悪化りを判定するようにな
る。これにより1表示装置18は現在の溶接状況の悪化
りを表示し、また警報装置19は強風等によるシールド
ガスの乱れにより溶接部12mのシールド性が不安定で
あることを警報するようになる。The deterioration of the welding condition can now be determined based on the difference in the work level. As a result, the display device 18 displays the deterioration of the current welding condition, and the alarm device 19 warns that the shielding performance of the welded portion 12m is unstable due to disturbance of the shielding gas due to strong winds or the like.
したがって、溶接作業中において何らかの原因によりシ
ールド性が損なわれ溶接状況が悪化したことを、自動的
に判定して表示警報することができるようになり、溶接
作業者はこの判定に応じて直ちに溶接作業を中止する等
の処置を施すことが可能となる。Therefore, it is now possible to automatically determine that the shielding performance has been impaired and the welding situation has worsened due to some reason during welding work, and to issue a display warning. It becomes possible to take measures such as discontinuing the process.
尚、上記実施例では、一つの比較回路17VCより基準
音圧レベルFAおよび許容音圧変動幅PKに対する比較
判定を行ない、その判定結果を表示・警報して溶接状況
を知らせるようにしたが1例えば、第3図に示すように
構成した装置を使用すれば、溶接状態悪化の判定と同時
に自動的に溶接作業を停止させることが可能となる。す
なわち、マイクロホン13により入力検知した音響信号
を音圧検知装置21を介して基準音圧比較装置22およ
び音圧レベル振幅比較装置23に供給する。上記音圧検
知装置21は例えば前記第1図における増幅器14.帯
域透過フィルタ15a〜15C,および音圧レベル計1
1に対応するもので、また、基準音圧比較装置22およ
び音圧レベル振幅比較装置23は。In the above embodiment, the reference sound pressure level FA and the permissible sound pressure fluctuation range PK are compared and judged by one comparison circuit 17VC, and the judgment results are displayed and alarmed to notify the welding situation. If a device configured as shown in FIG. 3 is used, it becomes possible to automatically stop the welding operation at the same time as the deterioration of the welding condition is determined. That is, the acoustic signal input and detected by the microphone 13 is supplied to the reference sound pressure comparison device 22 and the sound pressure level amplitude comparison device 23 via the sound pressure detection device 21 . The sound pressure detection device 21 is, for example, the amplifier 14 in FIG. Band pass filters 15a to 15C, and sound pressure level meter 1
1, and the reference sound pressure comparison device 22 and the sound pressure level amplitude comparison device 23 correspond to.
それぞれ前記基準音圧レベルFAおよび許容音圧変動幅
PKに対する入力音圧信号値の比較判定を別々に行なう
ものである。そして、このそれぞれの比較装置22.2
3からの溶接良否判定信号を、″″警報装置19に供給
すると共に溶接装置24に供給する。これにより、上述
したように、溶接状態悪化の判定動作と溶接停止動作と
が連動するようになる。この場合、特に溶接ロボットや
自動化システムに適用することにより、大きな効果を発
揮する。The input sound pressure signal value is compared and judged separately with respect to the reference sound pressure level FA and the permissible sound pressure fluctuation range PK. And this respective comparison device 22.2
The welding quality determination signal from 3 is supplied to the alarm device 19 and also to the welding device 24. As a result, as described above, the operation for determining the deterioration of the welding condition and the operation for stopping welding are linked. In this case, it can be particularly effective when applied to welding robots and automation systems.
発明の効果〕
以上のようにこの発明によれば、溶接作業中に溶接部か
ら発生する音響信号の音圧レベルを常時安定溶接状態に
おける基準音圧レベルと比較判定することにより1例え
ば溶接部にシールド異常が生じた場合でも、溶接部に欠
陥を生じさせることなく、溶接品質の劣化を未然にそし
て最小限に防止することが可能となり、ガスシールド溶
接法の信頼性が向上する。[Effects of the Invention] As described above, according to the present invention, by comparing and determining the sound pressure level of an acoustic signal generated from a welding part during welding work with the reference sound pressure level in a constantly stable welding state, Even if a shield abnormality occurs, it is possible to prevent the deterioration of welding quality to a minimum without causing defects in the welded part, and the reliability of the gas shield welding method is improved.
I!1図はこの発明の一実施例に係る溶接状況監視方法
を説明するための装置構成図、第2図は溶接アーク音の
音圧分布を示す図、第3図はこの発明の他の実施例を説
明するための装置構成図である。
12a・・・溶接部、13・・・マイクロホン、16・
・・音圧レベル計、17・・・比較回路。
出願人復代理人 弁理士 鈴 江 武 彦第2図
第3図I! Figure 1 is a diagram showing the configuration of a device for explaining a welding status monitoring method according to an embodiment of the present invention, Figure 2 is a diagram showing the sound pressure distribution of welding arc sound, and Figure 3 is another embodiment of the present invention. FIG. 2 is an apparatus configuration diagram for explaining. 12a...Welding part, 13...Microphone, 16.
...Sound pressure level meter, 17...Comparison circuit. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 2 Figure 3
Claims (1)
音響信号入力手段により入力される音響信号の音圧レベ
ルと予め記憶名れる安定溶接時における音響信号の音圧
レベルとを比較する手段とを具備し、上記比較手段によ
り比較されるそれぞれの溶接時の音圧レベルの差に応じ
て溶接状態の良否判定を行なうことを特徴とする溶接状
況監視方法。means for inputting an acoustic signal generated during welding; and means for comparing the sound pressure level of the acoustic signal input by the welding acoustic signal input means with the sound pressure level of the acoustic signal during stable welding stored in advance. A method for monitoring a welding condition, comprising: determining the quality of the welding condition according to the difference in sound pressure level during each welding operation compared by the comparison means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13632484A JPS6114083A (en) | 1984-06-30 | 1984-06-30 | Welding state monitoring method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13632484A JPS6114083A (en) | 1984-06-30 | 1984-06-30 | Welding state monitoring method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6114083A true JPS6114083A (en) | 1986-01-22 |
Family
ID=15172560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13632484A Pending JPS6114083A (en) | 1984-06-30 | 1984-06-30 | Welding state monitoring method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6114083A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4943701A (en) * | 1988-03-18 | 1990-07-24 | Hitachi, Ltd. | Apparatus for and method of detecting arc length, apparatus for and method of controlling welding torch height, and automatic welder and automatic welding method |
JPH02255272A (en) * | 1989-03-30 | 1990-10-16 | Kawasaki Steel Corp | Method and equipment for automatic circumferential welding |
GB2244229A (en) * | 1989-01-13 | 1991-11-27 | Central Electr Generat Board | Welding method and apparatus |
US5121339A (en) * | 1990-08-16 | 1992-06-09 | General Motors Corporation | Laser weld fault detection system |
CN102764927A (en) * | 2012-07-03 | 2012-11-07 | 广东技术师范学院 | Method for quantitatively evaluating stability of arc welding process based on sample entropy of arc sound sound spectrum |
JP2014113637A (en) * | 2012-12-12 | 2014-06-26 | Daihen Corp | Welder |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4925A (en) * | 1972-04-14 | 1974-01-05 |
-
1984
- 1984-06-30 JP JP13632484A patent/JPS6114083A/en active Pending
Patent Citations (1)
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JPS4925A (en) * | 1972-04-14 | 1974-01-05 |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4943701A (en) * | 1988-03-18 | 1990-07-24 | Hitachi, Ltd. | Apparatus for and method of detecting arc length, apparatus for and method of controlling welding torch height, and automatic welder and automatic welding method |
GB2244229A (en) * | 1989-01-13 | 1991-11-27 | Central Electr Generat Board | Welding method and apparatus |
GB2244229B (en) * | 1989-01-13 | 1993-01-06 | Central Electr Generat Board | Welding method and apparatus |
JPH02255272A (en) * | 1989-03-30 | 1990-10-16 | Kawasaki Steel Corp | Method and equipment for automatic circumferential welding |
JPH05141B2 (en) * | 1989-03-30 | 1993-01-05 | Kawasaki Steel Co | |
US5121339A (en) * | 1990-08-16 | 1992-06-09 | General Motors Corporation | Laser weld fault detection system |
CN102764927A (en) * | 2012-07-03 | 2012-11-07 | 广东技术师范学院 | Method for quantitatively evaluating stability of arc welding process based on sample entropy of arc sound sound spectrum |
JP2014113637A (en) * | 2012-12-12 | 2014-06-26 | Daihen Corp | Welder |
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