JPH0653310B2 - Weldability determination method for arc welding - Google Patents
Weldability determination method for arc weldingInfo
- Publication number
- JPH0653310B2 JPH0653310B2 JP59193539A JP19353984A JPH0653310B2 JP H0653310 B2 JPH0653310 B2 JP H0653310B2 JP 59193539 A JP59193539 A JP 59193539A JP 19353984 A JP19353984 A JP 19353984A JP H0653310 B2 JPH0653310 B2 JP H0653310B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- voltage
- current
- short
- 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 - Fee Related
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
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/073—Stabilising the arc
- B23K9/0738—Stabilising of the arc by automatic re-ignition means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明はCO2およびＭＡＧ溶接等における溶接作業性を
自動的、定量的に判定する方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for automatically and quantitatively determining welding workability in CO 2 and MAG welding and the like.
CO2およびＭＡＧ溶接では、良好な溶接が行なえる電圧
値は使用する電流値によつて異なる。又、電圧を適正値
に設定しても、アーク状態は電流値によつて異なる。し
がたがつて、各電流値ごとに適正な電圧値の設定を行う
ためには、作業者の相当な経験・技量等が必要である。
しかし、作業者による設定は、作業者自身の経験、技
量、好み等によつて決まる定性的なものであり、優秀な
作業者であればあるほどその設定は正しいと言えるが、
一般に個人差があり、統一的な基準を求めることは不可
能である。In CO 2 and MAG welding, the voltage value at which good welding can be performed depends on the current value used. Even if the voltage is set to an appropriate value, the arc state varies depending on the current value. Therefore, in order to set an appropriate voltage value for each current value, considerable experience and skill of the operator are required.
However, the setting by the worker is qualitatively determined by the experience, skill, preference, etc. of the worker himself, and it can be said that the setting is correct for the better worker.
Generally, there are individual differences, and it is impossible to seek uniform standards.
一方、電流値ごとに適正な電圧設定ができる調整ツマミ
位置を表示する方法、あるいは、前もって電流値に応じ
た適正電圧値をプリセットしておき、作業者の設定する
電圧値と一致した場合にランプを点灯させる方法等によ
り、未熟練作業者でも条件設定ができるうよになつてい
るものもある。しかし、これらの適正電圧値は、熟練作
業者がある一定の作業環境のもとに基準作業を行つて求
めた値であり、種々広範囲な実際の溶接作業条件・環境
においても、すべて満足する値とは限らない。すなわ
ち、適正値とされている電圧が、実際の作業では高過ぎ
たり低過ぎたりすることがある。On the other hand, a method of displaying the adjustment knob position that allows the appropriate voltage setting for each current value, or presetting an appropriate voltage value according to the current value in advance, and when the voltage value set by the operator matches There are some methods that allow even unskilled workers to set conditions, such as by turning on. However, these proper voltage values are values obtained by performing the standard work under a certain working environment by a skilled worker, and are values that satisfy all of the wide range of actual welding work conditions and environments. Not necessarily. That is, the voltage that is set to an appropriate value may be too high or too low in actual work.
本発明の目的は、上記した従来技術の欠点をなくし、作
業者の熟練度に関係なく、作業条件・環境が変化して
も、それに応じた適正な溶接条件を設定できるようにす
ることにある。An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to make it possible to set appropriate welding conditions in accordance with changes in working conditions / environments regardless of the skill level of workers. .
本発明は、母材とワイヤが短絡する期間と母材とワイヤ
の間にアークを発生する期間を交互にくり返すCO2ある
いはＭＡＧ溶接において、各周期の母材とワイヤが短絡
する期間中に与えられる入熱の変化度を、最大短絡電
流、短絡時の電流の平均値、短絡値の実効電流、短絡時
の電力等の標準偏差を用いて表わし、該標準偏差の値に
より溶接性を判定することを特徴とするものである。The present invention, in CO 2 or MAG welding in which a period during which a base material and a wire are short-circuited and a period during which an arc is generated between the base material and a wire are alternately repeated, during a period during which the base material and the wire are short-circuited in each cycle. The degree of change in heat input given is expressed using the standard deviation of maximum short-circuit current, average value of current at short-circuit, effective current of short-circuit value, power at short-circuit, etc., and weldability is judged by the value of the standard deviation. It is characterized by doing.
一般に、CO2あるいはＭＡＧ溶接は、第１図のように、
溶接電圧が低く、溶接電流が急激に増加する短絡時間
と、溶接電圧が高く溶接電流が減少するアーク期間を交
互にくり返し行なわれる。これら２つの期間のうち、短
絡期間は、電磁ピンチ力によつて溶滴をワイヤから離脱
させるための期間であり、溶接電流の変化量も大きく、
溶接性に大きな影響を与える。Generally, CO 2 or MAG welding, as shown in Fig. 1,
A short circuit time in which the welding voltage is low and the welding current rapidly increases and an arc period in which the welding voltage is high and the welding current decreases are alternately repeated. Of these two periods, the short circuit period is a period for separating the droplet from the wire by the electromagnetic pinch force, and the change amount of the welding current is large,
It greatly affects weldability.
第１図において、破線で示した短絡期間中の溶接電流の
平均値Is・aveについて、溶接電流１３０ＡでCO2溶接を
行つた場合の分布を求めると、溶接電圧の変化にともな
い第２図〜第８図のようである。図中、左上に示した値
が溶接電圧、右上に示した丸印は熟練作業者が判定した
溶接性を示す記号である。なお、溶接性を示す記号は、
黒い部分が多い程、溶接性が悪いことを意味する。In FIG. 1, for the average value I s · ave of the welding current during the short-circuit period indicated by the broken line, the distribution when CO 2 welding was performed at a welding current of 130 A was found. ~ As in FIG. In the figure, the values shown in the upper left are welding voltages, and the circles shown in the upper right are symbols showing weldability determined by a skilled worker. The symbol indicating weldability is
The larger the black portion, the poorer the weldability.
適正電圧では、Is・aveのバラツキが少なく、ピーク値を
中心としたほぼ対称の分布を示すが（第４図、第５図、
第６図）、溶接性が悪くなるに従い、対称性がなくな
り、さらにはピーク値がそれほど明瞭でない大きいバラ
ツキのある分布となる（第２図、第８図）。この傾向は
低電圧側、高電圧側ともにほぼ同様である。このような
傾向は、Is・ave以外に、短絡時の最大電流Imax、短絡時
の実効電流Is・effおよび短絡期間中の電流と電圧の積の
和である電力Psにも認められる。At an appropriate voltage, there is little variation in I s · ave , and the distribution is almost symmetrical about the peak value (see FIGS. 4 and 5).
(Fig. 6) As the weldability deteriorates, the symmetry disappears, and the distribution has a large variation in which the peak value is not so clear (Figs. 2 and 8). This tendency is almost the same on the low voltage side and the high voltage side. In addition to I save , this tendency is also observed in the maximum current I max during a short circuit, the effective current I s eff during a short circuit, and the power Ps that is the sum of the product of the current and voltage during the short circuit period. .
第９図は上記１３０ＡのCO2溶接時のImaxの標準偏差σ
Imaxと溶接電圧の関係を示したものである。σImaxは、
適正電圧で小い値となり、適正電圧から外れ、溶接性が
悪くなるにつれて大きい値となる。この傾向は、Is・ave
の標準偏差σIs・ave，Is・effの標準偏差σIs・effについ
ても同様であり、それぞれ第１０図、第１１図に示す。
又、これらの傾向は溶接機の種類が異なつても同様であ
る。他の機種についてのσImax，σIs・ave，σIs・effの
１例をそれぞれ第１２図、第１３図および第１４図に示
す。FIG. 9 shows the standard deviation σ of I max during CO 2 welding of the above 130A.
It shows the relationship between Imax and welding voltage. σ Imax is
It becomes a small value at an appropriate voltage, and deviates from the appropriate voltage and becomes large as the weldability deteriorates. This trend is, I s · ave
The same applies to the standard deviation σ Is · ave of I s · eff and the standard deviation σ Is · eff of I s eff , which are shown in FIGS. 10 and 11, respectively.
Moreover, these tendencies are the same even when the type of welding machine is different. Examples of σ Imax , σ Is · ave , and σ Is · eff for other models are shown in FIGS. 12, 13, and 14, respectively.
さらに、電流値、シールドガス組成が変化しても、これ
らの傾向が変わらない。１例として、２００ＡのCO2溶
接時のσImax，σIs・aveをそれぞれ第１５図、第１６図
に、シールドガス組成がCO2＋５０％Arを用いた１３０
ＡのＭＡＧ溶接時のσImax，σIs・aveをそれぞれ第１９
図、第２０図に示す。Further, even if the current value and the shield gas composition change, these tendencies do not change. As an example, σ Imax and σ Is · ave during CO 2 welding at 200 A are shown in FIGS. 15 and 16, respectively, and the shield gas composition is CO 2 + 50% Ar.
Σ Imax and σ Is · ave during MAG welding of A are 19th respectively
It is shown in FIG.
溶接電流が２００Ａ程度になると適用できないが、それ
以下の典型的なシヨートアーク移行領域ではPSの標準偏
差σPsについても上記した傾向がある。その１例を示す
と第１９図、第２０図のようである。第１９図は、第９
図〜第１１図と、第２０図は第１２図〜第１４図と同一
溶接時のσPSと溶接電圧の関係である。It cannot be applied when the welding current is about 200 A, but the standard deviation σ Ps of PS also has the above-described tendency in a typical short arc transition region below that. An example thereof is shown in FIGS. 19 and 20. FIG. 19 shows the ninth
FIG. 11 to FIG. 20 and FIG. 20 show the relationship between σ PS and welding voltage at the same welding as in FIGS. 12 to 14.
以上のように、σImax，σIs・ave，σIs・effおよびσPS
いずれを用いても、溶接性を評価することができる。
又、これらの標準偏差が最小とする電圧値の設定を行な
えば、適正条件の設定となる。As described above, σ Imax , σ Is · ave , σ Is · eff and σ PS
Any of these can be used to evaluate the weldability.
Further, if the voltage value is set so that these standard deviations are minimized, the appropriate condition is set.
第２１図は本発明の一実施例のブロツク図である。図に
おいて、溶接電源１は所定の電圧をワイヤ２と母材４の
間に印加せしめる。ワイヤ２は母材４を溶接するため、
送給ローラ３によつて所定速度で送給される。このワイ
ヤ２の送り速度に溶接電流がほゞ比例する。図では省略
されているが、ワイヤ２の先端部にはトーチがあり、ワ
イヤの送りとともにCO2やＭＡＧガスが噴出するように
なつている。５は溶接電流を測定するための分流器、６
および７はそれぞれ溶接電圧、溶接電流を測定し、所定
のレベルに増幅するための電圧検出器および電流検出器
である。該電圧検出器６および電流検出器７の出力はア
ナログ・デイジタル変換器（Ａ／Ｄ変換器）８により所
定の間隔でサンプリングされてデイジタル値の電圧デー
タ、電流データに変換され、順次、中央処理装置（ＣＰ
Ｕ）９に入力される。ＣＰＵ９では、入力された電圧デ
ータ、電流データにより最大短絡電流、短絡時の電流平
均値、短絡時の実効電流あるいは短絡時の電流の標準偏
差を求め、該標準偏差が最小値となるように溶接条件の
設定を行う。ＣＰＵ９から出力された電圧増減データは
デイジタル・アナログ変換器（Ｄ／Ａ変換器）１３でア
ナログ信号に変換され、出力制御回路１４を介して溶接
電源１の出力電圧の増減が行われる。１０はＣＰＵ９の
処理結果を表示するデイスプレイ、１１は入力された電
圧・電流データ、演算の途中データ、各種の定数、およ
びＣＰＵ９の処理プログラム等を格納するメモリ、１２
はＣＰＵ９の処理に必要とする各種の定数、初期データ
等を入力するキーボードである。FIG. 21 is a block diagram of an embodiment of the present invention. In the figure, the welding power source 1 applies a predetermined voltage between the wire 2 and the base material 4. Since the wire 2 welds the base material 4,
It is fed by the feeding roller 3 at a predetermined speed. The welding current is almost proportional to the feed rate of the wire 2. Although not shown in the figure, a torch is provided at the tip of the wire 2 so that CO 2 and MAG gas are ejected as the wire is fed. 5 is a shunt for measuring welding current, 6
Reference numerals 7 and 7 are a voltage detector and a current detector for measuring the welding voltage and the welding current and amplifying them to a predetermined level. The outputs of the voltage detector 6 and the current detector 7 are sampled at a predetermined interval by an analog digital converter (A / D converter) 8 and converted into digital value voltage data and current data, which are sequentially processed by a central processing unit. Device (CP
U) 9 is input. The CPU 9 obtains the maximum short-circuit current, the current average value at the time of the short-circuit, the effective current at the time of the short-circuit or the standard deviation of the current at the time of the short-circuit by the input voltage data and current data, and welds the standard deviation to the minimum value. Set the conditions. The voltage increase / decrease data output from the CPU 9 is converted into an analog signal by the digital / analog converter (D / A converter) 13, and the output voltage of the welding power source 1 is increased / decreased via the output control circuit 14. Reference numeral 10 is a display for displaying the processing result of the CPU 9, 11 is a memory for storing the input voltage / current data, intermediate data of calculation, various constants, a processing program of the CPU 9, and the like, 12
Is a keyboard for inputting various constants, initial data, etc. required for the processing of the CPU 9.
第２１図におけるＣＰＵ９を中心とする処理フローを第
２２図に示す。A processing flow centering on the CPU 9 in FIG. 21 is shown in FIG.
初め、所定の溶接電流I0および概略の溶接電圧V0、サン
プリングを行うデータ数Ｎ、溶接電圧・溶接電流のサン
プリング間隔Ｓ、短絡／アークの判定電圧Vj、および溶
接性を判定するのに用いる波形データの種類の設定、最
小値算出のための初期データｎ、Z0等をキーボード１２
より入力する（ステツプ１０１，１０２）。サンプリン
グデータ数Ｎは、大きければ大きい程正確なデータを得
ることができるが、その分、サンプリングに時間がかか
り、かつメモリ容量も大きくとなければならないため、
５００〜１０００程度にすればよい。サンプリング間隔
Ｓは、短ければ短かい程正確なデータが得られるが、や
はりメモリ容量にも関係するため、小電流域では０．１
ms程度、大電流域では０．２ms程度にすれば、実用上問
題とはならない。短絡／アークの判定電圧Vjは、電流値
に関係なく約１０Ｖ程度の値としてもよいが、電流値に
応じて、短絡電圧、溶滴の移行形態等が変化するため、
例えば、 Ｉ≦２００Ａの場合 Vj＝１０Ｖ ２００Ａ＜Ｉ≦２５０Ａの場合 Vj＝１５Ｖ ２５０Ａ＜Ｉの場合 Vj＝２０Ｖ のように、電流値に応じて多少変化させるほうが良い結
果を得ることができる。First, a predetermined welding current I 0 and a rough welding voltage V 0 , the number of data N to be sampled, a welding voltage / welding current sampling interval S, a short-circuit / arc determination voltage Vj, and weldability are used to determine. The keyboard 12 is used to set the type of waveform data and the initial data n, Z 0 for calculating the minimum value.
More input (steps 101 and 102). The larger the number N of sampling data, the more accurate the data can be obtained, but the sampling takes time and the memory capacity must be large accordingly.
It may be about 500 to 1000. The shorter the sampling interval S is, the more accurate data can be obtained, but since it also relates to the memory capacity, it is 0.1 in the small current region.
If it is set to about ms, and about 0.2 ms in the large current region, there will be no practical problem. The short-circuit / arc determination voltage Vj may be a value of about 10 V regardless of the current value, but since the short-circuit voltage, the transfer form of droplets, etc. change according to the current value,
For example, when I ≦ 200A, Vj = 10V 200A <I ≦ 250A, Vj = 15V 250A <I, Vj = 20V. It is possible to obtain a better result by changing the current value to some extent.
次に溶接を開始し（ステツプ１０３）、ｎ＝ｎ＋１とし
た後（ステツプ１０４）、電圧検出器６、電流検出器７
で検出された溶接電圧、溶接電流をＡ／Ｄ変換器８によ
り所定の間隔Ｓでサンプリングしデイジタル変換して溶
接電圧データＶ(i)、電流データＩ(i)（ｉはサンプリン
グ番号を示す）を得、ＣＰＵ９を通してメモリ１１へ記
憶する（ステツプ１０５〜１０７）。溶接電圧／電流デ
ータのサンプリングは、前もつて設定したサンプル数Ｎ
に達するまで行う（ステツプ１０８，１０９）。溶接電
圧データＶ(i)、溶接電流データＩ(i)のサンプリングが
完了すると、メモリ１１よりＶ(i)を順次読み出し、前
もつて設定したVjと比較することにより、短絡開始点Ｓ
(R)とアーク開始点Ｔ(R)を求め、メモリ１１へ記憶する
（ステツプ１１０）。第２４図は溶接電圧の変化と短絡
開始点Ｓ(R)、アーク開始点Ｔ(R)の関係を示したもので
ある。第２４図に示すように、Ｖ(i)は短絡期間ではVj
より低く、アーク期間ではVjより高くなる。そこで、各
サンプリング点のＶ(i)とVjの大小を順次比較すること
により、短絡開始点Ｓ(R)はＶ(i)がＶ(i)＞VjからＶ(i)
＜Vjに変化する点として、アーク開始点Ｔ(R)は逆にＶ
(i)がＶ(i)＜VjからＶ(i)＞Vjに変化する点して求ま
る。Next, welding is started (step 103), and after n = n + 1 (step 104), the voltage detector 6 and the current detector 7 are connected.
The welding voltage and welding current detected by the A / D converter 8 are sampled at predetermined intervals S and digitally converted to welding voltage data V (i) and current data I (i) (i indicates a sampling number). Is obtained and stored in the memory 11 through the CPU 9 (steps 105 to 107). Sampling of welding voltage / current data is performed by preset number of samples N
(Steps 108 and 109). When the sampling of the welding voltage data V (i) and the welding current data I (i) is completed, V (i) is sequentially read from the memory 11 and compared with Vj set in advance to determine the short circuit start point S.
(R) and the arc start point T (R) are obtained and stored in the memory 11 (step 110). FIG. 24 shows the relationship between the change in welding voltage and the short circuit starting point S (R) and arc starting point T (R). As shown in FIG. 24, V (i) is Vj during the short circuit period.
It is lower and higher than Vj during the arc period. Therefore, by comparing the magnitudes of Vj and Vj at each sampling point in sequence, the short circuit starting point S (R) is V (i) from V (i)> Vj to V (i).
As a point to change to <Vj, the arc start point T (R) is conversely V
It can be obtained by the point where (i) changes from V (i) <Vj to V (i)> Vj.
短絡開始点Ｓ(R)、アーク開始点Ｔ(R)の記憶が完了する
と、Ｒを０〜Ｒ−１まで順次変化させ、各周期毎の波形
データを求める（ステツプ１１１）。When the storage of the short-circuit starting point S (R) and the arc starting point T (R) is completed, R is sequentially changed from 0 to R-1 to obtain the waveform data for each cycle (step 111).
こゝで、波形データの種類は、 Imaxの場合は Imax(R)＝〔I(S(R))〜I(T(R))の中のＩ(i)の最大値〕 Is・aveの場合は Is・effの場合は Psの場合は である。Here, when the type of waveform data is I max , I max (R) = [maximum value of I (i) in I (S (R)) to I (T (R))] I s・ For ave In case of Is eff For Ps Is.
このようにして求めた波形データにより標準偏差Znを算
出し（ステツプ１１２）、メモリ１１に記憶する（ステ
ツプ１１３）。こゝで、波形データをＸ(R)とすると、
Ｘ(R)および｛Ｘ(R)｝２を積算することにより、標準偏
差Znは、 のようにして求めることができる。このZnを必要に応じ
てデイスプレイ１０に表示する。The standard deviation Zn is calculated from the waveform data thus obtained (step 112) and stored in the memory 11 (step 113). Here, if the waveform data is X (R),
By integrating X (R) and {X (R)} 2 , the standard deviation Zn is You can ask for it. This Zn is displayed on the display 10 as needed.
標準偏差Znが求まると、これを前回求めたZn-1と比較し
（ステツプ１１４）、Zn＜Zn-1であれば、溶接電圧Ｖを
所定量（実施例では１Ｖ）増加させた後（ステツプ１１
５）、ステツプ１０４以降の処理を実行し、再度、Znを
求める。又、Zn＜Zn-1でなければ、溶接電圧Ｖを所定量
（実施例では、同じく１Ｖ）減少させた後（ステツプ１
１６）、Znを前々回求めたZn-2と比較し（ステツプ１１
７）、Zn＝Zn-2でなければ、同様にステツプ１０４以降
の処理を実行し、再度、Znを求める。この動作を繰り返
すことにより、Znが最小となる溶接電圧が求まる。第２
１図の構成で、溶接電圧Ｖの増減はＤ／Ａ変換器１３、
出力制御回路１４の径路で制御される。When the standard deviation Zn is obtained, it is compared with the previously obtained Zn -1 (step 114). If Zn <Zn -1 , the welding voltage V is increased by a predetermined amount (1V in the embodiment). (Step 11
5), the processes after step 104 are executed, and Zn is obtained again. If Zn <Zn -1 is not satisfied, the welding voltage V is decreased by a predetermined amount (the same is 1V in the embodiment) (step 1).
16), and compare Zn with Z n-2 obtained two times before (step 11
7) If not Zn = Z n-2 , the processes in step 104 and thereafter are similarly executed, and Zn is obtained again. By repeating this operation, the welding voltage that minimizes Zn is obtained. Second
With the configuration of FIG. 1, the increase / decrease of the welding voltage V is changed by the D / A converter 13,
It is controlled by the path of the output control circuit 14.
標準偏差Znの最小値が求まると、Znの算出を中止し、溶
接停止まで溶接電圧をその値に固定してもよいし（ステ
ツプ１１８，１１９，１２０の径路）、常時、Znの算出
を行い、Znが常に最小値となるように電圧を制御しても
よい（ステツプ１２１への分岐）。When the minimum value of the standard deviation Zn is obtained, the calculation of Zn may be stopped, and the welding voltage may be fixed to that value until the welding is stopped (path of steps 118, 119, 120), or the calculation of Zn is always performed. , Zn may be controlled such that Zn is always at the minimum value (branch to step 121).
本実施例では、溶接電圧を増減させて、Znの最小値を求
める方法について説明したが、電圧の代わりに、電流す
なわちワイヤ送給量を増減させて、Znの最小値を求める
方法としても同様の効果が得られるのは言うまでもな
い。In the present embodiment, the welding voltage is increased / decreased, and the method for obtaining the minimum value of Zn has been described.However, instead of the voltage, the current, that is, the wire feed amount is increased / decreased, and the method for obtaining the minimum value of Zn is also the same. Needless to say, the effect of can be obtained.
第２３図は第２２図におけるステツプ１１０の短絡／ア
ーク判定処理の詳細フローを示したものである。第２３
図では短絡開始点Ｓ(R)を求めることから処理が始まる
としている。FIG. 23 shows a detailed flow of the short circuit / arc determination process of step 110 in FIG. 23rd
In the figure, the processing is started by obtaining the short-circuit start point S (R).
まず、ｉ＝０、Ｒ＝０とした後（ステツプ２０１，２０
２）、メモリ８より最初のサンプリング点（ｉ＝０）の
溶接電圧データＶ(0)を読み出し、Vjと比較する（ステ
ツプ２０３）。そして、Ｖ(0)＞Vjであればステツプ２
０６に行くが、Ｖ(0)≦Vjであればｉ＝１にして（ステ
ツプ２０４）、次のサンプリング点（ｉ＝１）のＶ(1)
を読み出し、Vjと比較する（ステツプ２０５）。Ｖ(i)
≦Vjの間、ステツプ２０４、２０５の処理を繰り返す。
第２４図より、Ｖ(i)≦Vjは短絡期間を意味する。Ｖ(i)
＞Vjになると、ｉ＝ｉ＋１としてｉ＜Ｎを判定し（ステ
ツプ２０６，２０７）、ｉ＞Ｎであると該判定処理を終
了するが、ｉ＜Ｎの場合は、Ｖ(i)を読み出してＶ(i)＞
Vjを判定する（ステツプ２０８）。そして、Ｖ(i)＞Vj
の間、ステツプ２０６〜２０８の処理を繰り返す。第３
３図より、Ｖ(i)＞Vjはアーク期間を意味する。ステツ
プ２０６〜２０８の処理を繰り返し、Ｖ(i)≦Vjになる
と、その点が短絡開始点Ｓ(R)を意味する。このＳ(R)に
対応するサンプリング点(i)をメモリ１３の所定番地に
格納する（ステツプ２０９）。次に、ｉ＝ｉ＋１として
ｉ＜Ｎを判定し（ステツプ２１０，２１１）、ｉ＞Ｎで
あると判定処理を終了するが、ｉ＜Ｎの場合は、Ｖ(i)
を読み出してＶ(i)≦Vjを判定する（ステツプ２１
２）。そして、Ｖ(i)≦Vjの間、ステツプ２１０〜２１
２の処理を繰り返す。このようにしてＶ(i)＞Vjになる
と、その点がアーク開始点Ｔ(R)を意味する。このＴ(R)
に対応するサンプリング点(i)をメモリ１３に格納する
（ステツプ２１３）。その後、Ｒ＝Ｒ＋１として（ステ
ツプ２１４）、ステツプ２０６以降の処理を繰り返すこ
とにより、Ｓ(R)、Ｔ(R)が次々に求まる。そして、ｉ＞
Ｎになつた時点で該判定処理を終了とする。First, after setting i = 0 and R = 0 (steps 201, 20)
2) The welding voltage data V (0) at the first sampling point (i = 0) is read from the memory 8 and compared with Vj (step 203). If V (0)> Vj, step 2
However, if V (0) ≦ Vj, then i = 1 (step 204) and V (1) at the next sampling point (i = 1) is set.
Is read out and compared with Vj (step 205). V (i)
While ≤Vj, the processing of steps 204 and 205 is repeated.
From FIG. 24, V (i) ≦ Vj means a short circuit period. V (i)
> Vj, i <N is determined as i = i + 1 (steps 206 and 207), and if i> N, the determination process is ended. However, if i <N, V (i) is read. V (i)>
Vj is determined (step 208). And V (i)> Vj
During this period, the processes of steps 206 to 208 are repeated. Third
From FIG. 3, V (i)> Vj means the arc period. When the processing of steps 206 to 208 is repeated and V (i) ≦ Vj is satisfied, that point means the short-circuit start point S (R). The sampling point (i) corresponding to this S (R) is stored in a predetermined address of the memory 13 (step 209). Next, i <N + 1 is determined with i = i + 1 (steps 210 and 211), and the determination process ends if i> N. However, if i <N, V (i)
Is read to determine V (i) ≦ Vj (step 21
2). Then, while V (i) ≦ Vj, steps 210 to 21
The process of 2 is repeated. When V (i)> Vj in this way, that point means the arc start point T (R). This T (R)
The sampling point (i) corresponding to is stored in the memory 13 (step 213). After that, R = R + 1 is set (step 214) and the processing from step 206 is repeated to obtain S (R) and T (R) one after another. And i>
When it reaches N, the determination process is ended.
以上の説明から明らかな如く、本発明は、各繰り返し周
期の母材とワイヤが短絡する期間中に与えられる入熱の
変化度を、最大短絡電流、短絡時の電流の平均値、短絡
時の実効電流、短絡時の電力等の標準偏差を用いて表わ
し、該標準偏差の値により溶接性を判定するもので、次
のような効果が得られる。As is apparent from the above description, the present invention, the degree of change of heat input given during the short circuit of the base material and the wire of each repeating cycle, the maximum short circuit current, the average value of the current at the time of short circuit, It is expressed by using the standard deviation of the effective current, the electric power at the time of short circuit, etc., and the weldability is judged by the value of the standard deviation, and the following effects can be obtained.
(1)熟練作業者でなければ把握できなかつた溶接性を初
心者でも定量的に把握することができる。(1) Even a beginner can quantitatively grasp the weldability that cannot be grasped by a skilled worker.
(2)適正条件の設定を行うために必要とされていた作業
者の経験・技量は不要となり、条件設定を自動的に行う
ことができる。(2) The operator's experience and skill required for setting appropriate conditions are no longer required, and the conditions can be set automatically.
(3)作業条件・環境等が変化しても、その状況に応じた
適正な条件の設定を行うことができる。(3) Even if work conditions and environment change, it is possible to set appropriate conditions according to the situation.
第１図はアーク溶接の電流・電圧波形の説明図、第２図
乃至第８図は短絡時の平均電流の各電圧毎の分布を示す
図、第９図〜第１４図は１３０ＡのCO2溶接における各
標準偏差と電圧の関係を示す図、第１５図と第１６図は
２００ＡのCO2溶接における標準偏差と電圧の関係を示
す図、第１７図と第１８図は１３０ＡのＭＡＧ溶接にお
ける標準偏差と電圧の関係を示す図、第１９図と第２０
図は１３０ＡのCO2溶接における他の標準偏差と電圧の
関係を示す図、第２１図は本発明の一実施例のブロツク
図、第２２図は第２１図の動作を説明する全体フロー
図、第２３図は第２２図における短絡／アーク判定処理
ステツプの詳細フロー図、第２４図は短絡／アーク開始
点の説明図である。 １……溶接電源、２……ワイヤ、３……給送ローラ、４
……母材、５……分流器、６……電圧検出器、７……電
流検出器、８……Ａ／Ｄ変換器、９……ＣＰＵ、１０…
…デイスプレイ、１１……メモリ、１２……キーボー
ド、１３……Ｄ／Ａ変換器、１４……出力制御回路。FIG. 1 is an explanatory diagram of current and voltage waveforms of arc welding, FIGS. 2 to 8 are diagrams showing distribution of average current for each voltage at short circuit, and FIGS. 9 to 14 are CO 2 of 130 A in FIGS. 9 to 14. FIG. 15 and FIG. 16 show the relationship between standard deviation and voltage in welding, FIG. 15 and FIG. 16 show the relationship between standard deviation and voltage in CO 2 welding at 200 A, and FIGS. 17 and 18 show MAG welding at 130 A. Figures showing the relationship between standard deviation and voltage, Figures 19 and 20
FIG. 21 is a diagram showing the relationship between another standard deviation and voltage in 130 A CO 2 welding, FIG. 21 is a block diagram of one embodiment of the present invention, and FIG. 22 is an overall flow diagram for explaining the operation of FIG. FIG. 23 is a detailed flow chart of the short circuit / arc determination processing step in FIG. 22, and FIG. 24 is an explanatory diagram of the short circuit / arc starting point. 1 ... Welding power source, 2 ... Wire, 3 ... Feed roller, 4
...... Base material, 5 ...... Current shunt, 6 ...... Voltage detector, 7 ...... Current detector, 8 ...... A / D converter, 9 ...... CPU, 10 ...
... Display, 11 ... Memory, 12 ... Keyboard, 13 ... D / A converter, 14 ... Output control circuit.
Claims (2)
ヤの間にアークを発生する期間を交互に繰り返して溶接
を実施するアーク溶接において、各繰り返し周期の母材
とワイヤが短絡する期間中に与えられる入熱の変化度
を、最大短絡電流、短絡時の電流の平均値、短絡時の実
効電流および短絡時の電力の少なくとも１つの標準偏差
を用いて表わし、該標準偏差の値により溶接性を判定す
ることを特徴とするアーク溶接の溶接性判定方法。1. In arc welding in which welding is performed by alternately repeating a period in which a base material and a wire are short-circuited and a period in which an arc is generated between the base material and a wire, the base material and the wire are short-circuited at each repetition cycle. The degree of change in heat input given during the period is expressed using at least one standard deviation of the maximum short-circuit current, the average value of the current during the short circuit, the effective current during the short circuit and the power during the short circuit, and the value of the standard deviation. Weldability determination method for arc welding, characterized by determining weldability by means of
件の設定を行うことを特徴とする特許請求の範囲第１項
記載のアーク溶接の溶接性判定方法。2. The weldability determination method for arc welding according to claim 1, wherein welding conditions are set so that the standard deviation becomes a minimum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59193539A JPH0653310B2 (en) | 1984-09-14 | 1984-09-14 | Weldability determination method for arc welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59193539A JPH0653310B2 (en) | 1984-09-14 | 1984-09-14 | Weldability determination method for arc welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6171179A JPS6171179A (en) | 1986-04-12 |
| JPH0653310B2 true JPH0653310B2 (en) | 1994-07-20 |
Family
ID=16309753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59193539A Expired - Fee Related JPH0653310B2 (en) | 1984-09-14 | 1984-09-14 | Weldability determination method for arc welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0653310B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004122180A (en) * | 2002-10-02 | 2004-04-22 | Nippon Sanso Corp | Apparatus for selecting welding parameter and apparatus for inspecting weld |
| JP4400714B2 (en) * | 2003-11-20 | 2010-01-20 | 株式会社安川電機 | Welding system |
| CN110049844B (en) * | 2017-01-24 | 2021-04-06 | 株式会社达谊恒 | Arc welding control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE425060B (en) * | 1978-05-30 | 1982-08-30 | Thermal Dynamics Corp | SHORT REAR WELDING DEVICE |
-
1984
- 1984-09-14 JP JP59193539A patent/JPH0653310B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6171179A (en) | 1986-04-12 |
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