JPH0241392B2 - - Google Patents
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- Publication number
- JPH0241392B2 JPH0241392B2 JP55148472A JP14847280A JPH0241392B2 JP H0241392 B2 JPH0241392 B2 JP H0241392B2 JP 55148472 A JP55148472 A JP 55148472A JP 14847280 A JP14847280 A JP 14847280A JP H0241392 B2 JPH0241392 B2 JP H0241392B2
- Authority
- JP
- Japan
- Prior art keywords
- filler metal
- current
- workpiece
- voltage
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Arc Welding In General (AREA)
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
本発明は、非消耗もしくは消耗電極と被溶接物
との間に発生したアーク又は被溶接物に形成され
た溶融プールに予め加熱をした溶加材を送給して
溶接するホツトワイヤ溶接方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention involves feeding a preheated filler metal into an arc generated between a non-consumable or consumable electrode and a workpiece, or into a molten pool formed on the workpiece. This invention relates to a hot wire welding method.
従来、第１図に示すように、非消耗もしくは消
耗電極１と被溶接物２との間に溶接用電源３を接
続してアーク４又は溶融プール５に溶加材加熱用
電源６′からら給電用チツプ８を通して加熱した
溶加材７を送給して溶接するホツトワイヤ溶接方
法において、溶加材７と被溶接物２との間ではア
ーク４を発生させないようにするために、溶加材
７と被溶接物２間に接続される加熱用電源６′と
しては、垂下特性を有する変圧器WTの出力端子
ｔ−ｔ間に適当な抵抗値の抵抗器Ｒを接続して出
力電圧を下げ、アークの発生しない範囲で変圧器
WTの最大出力電圧が出力電流に比例して増加す
るような特性の溶加材加熱用電源が提案されてい
る。しかし、このような特性の電源では、変圧器
WTと抵抗器Ｒとの組合せによつてアークが発生
しないように出力電圧を下げているために、負荷
電流に対して略一定の電流を供給する、いわゆる
完全な定電流特性を得ることは困難であり、第２
図に示すように従来の比較的ゆるやかな下降特性
を有する垂下特性に近い特性とならざるを得な
い。 Conventionally, as shown in FIG. 1, a welding power source 3 is connected between a non-consumable or consumable electrode 1 and a workpiece 2, and an arc 4 or a molten pool 5 is supplied from a filler metal heating power source 6'. In the hot wire welding method in which heated filler metal 7 is fed through a power supply tip 8 for welding, in order to prevent arc 4 from being generated between the filler metal 7 and the workpiece 2, As a heating power source 6' connected between 7 and the workpiece 2, a resistor R with an appropriate resistance value is connected between the output terminals t and t of a transformer WT having drooping characteristics to lower the output voltage. , transformer in an arc-free range
A filler metal heating power supply has been proposed that has characteristics such that the maximum output voltage of the WT increases in proportion to the output current. However, in a power supply with such characteristics, the transformer
Since the output voltage is lowered by the combination of WT and resistor R to prevent arcing, it is difficult to obtain so-called perfect constant current characteristics that supply a nearly constant current to the load current. and the second
As shown in the figure, the characteristic must be close to the conventional drooping characteristic which has a relatively gradual descending characteristic.
第２図は第１図に示す従来の溶加材加熱用電源
６′および変圧器WTの出力特性と溶加材の負荷
特性との関係を示す線図であつて、横軸は変圧器
の出力電流Ｉを示す。実線の縦軸は加熱用電源の
出力端子電圧および溶加材の給電用チツプと被溶
接物との端子電圧Ｖを示し、２点鎖線の縦軸は変
圧器WTの出力端子電圧V′を示す。溶加材加熱用
電源６′および変圧器WTの出力特性は、無負荷
電圧がそれぞれEoおよびEo′の曲線DP−CCで示
されるような比較的ゆるやかな下降傾斜を有する
垂下特性である。溶加材７への通電電流Ｉを横軸
とし、給電用チツプ８・被溶接物２間の端子電圧
Ｖを縦軸とする溶加材の負荷特性は、溶加材７へ
の通電回路の抵抗値によつて変動するFW0，
FW1，FW2等の略直線となる。今、定常状態に
おける溶加材７の通電回路の抵抗値によつて定ま
る溶加材の負荷特性がFW0であるとすれば、こ
のときの溶加材への通電電流は第１図に示すよう
にI0であるが、給電用チツプ８と溶加材７との接
触抵抗の変動、ホツトワイヤ送給速度の変化によ
る溶加材７の先端７ａと溶融プール５との間のワ
イヤ突出長Exの変動、電源電圧の変動等によつ
て溶加材７の通電回路の抵抗値が変動してそれが
大になれば、直線FW1のごとく、またそれが小
になれば、直線FW2のごとく変動して、溶加材
への通電電流もI0からI1に減少したり、又はI0か
らI2に増加したりして、相当に変動する。なお、
曲線DP−CCの上下の点線の曲線は、加熱用電源
の出力電流を増加又は減少させたときの出力電
圧・電流の特性であつて、通常、出力電流を増加
させるときには無負荷電圧を上昇させ、逆に出力
電流を減少させるときには無負荷電圧を下降させ
ている。また、溶加材７の材質、直径等により加
熱されるべき溶加材７の突出部の抵抗値が異なる
ために、それらが変更される毎に変圧器WTの出
力端子ｔ−ｔ間に接続されている抵抗器Ｒの値を
変更することが必要であり、実用上問題がある。
さらに変圧器WTの出力端子ｔ−ｔ間に接続する
抵抗器Ｒは、大容量の低抵抗値とならざるを得な
いので、この抵抗器Ｒによる電力損も大きい。例
えば、抵抗値100mΩの抵抗器Ｒを接続し出力電
圧を10Vとすると、発熱量は102／0.1＝1000Wと
なる。このように、略垂下特性の変圧器WTの出
力端子ｔ−ｔ間に抵抗値Ｒを接続した溶加材加熱
用電源では、多くの問題を残していた。 Fig. 2 is a diagram showing the relationship between the output characteristics of the conventional filler metal heating power supply 6' and the transformer WT shown in Fig. 1 and the load characteristics of the filler metal. Output current I is shown. The vertical axis of the solid line indicates the output terminal voltage of the heating power supply and the terminal voltage V between the filler metal power supply chip and the workpiece, and the vertical axis of the two-dot chain line indicates the output terminal voltage V' of the transformer WT. . The output characteristics of the filler metal heating power supply 6' and the transformer WT are drooping characteristics in which the no-load voltage has a relatively gentle downward slope as shown by the curves DP-CC of Eo and Eo', respectively. The load characteristics of the filler metal, where the horizontal axis is the current I flowing to the filler metal 7 and the vertical axis is the terminal voltage V between the power supply chip 8 and the workpiece 2, are as follows: FW 0 varies depending on the resistance value,
FW 1 , FW 2 , etc. are approximately straight lines. Now, assuming that the load characteristic of the filler metal determined by the resistance value of the current-carrying circuit of the filler metal 7 in a steady state is FW 0 , the current flowing to the filler metal at this time is shown in Figure 1. As shown in FIG . If the resistance value of the energizing circuit of the filler metal 7 fluctuates due to fluctuations in the power supply voltage, fluctuations in the power supply voltage, etc., and if it becomes large, it will become like the straight line FW 1 , and if it becomes small, it will become like the straight line FW 2 . The current applied to the filler metal also varies considerably, decreasing from I 0 to I 1 or increasing from I 0 to I 2 . In addition,
The dotted curves above and below the curve DP-CC are the characteristics of the output voltage and current when the output current of the heating power supply is increased or decreased.Normally, when increasing the output current, the no-load voltage is increased. Conversely, when decreasing the output current, the no-load voltage is decreased. In addition, since the resistance value of the protruding part of the filler metal 7 to be heated differs depending on the material, diameter, etc. of the filler metal 7, it is necessary to connect between the output terminals t and t of the transformer WT every time they are changed. It is necessary to change the value of the resistor R, which poses a practical problem.
Furthermore, since the resistor R connected between the output terminals t and t of the transformer WT must have a large capacity and a low resistance value, the power loss due to this resistor R is also large. For example, if a resistor R with a resistance value of 100 mΩ is connected and the output voltage is 10V, the amount of heat generated will be 10 2 /0.1 = 1000W. As described above, the power source for heating the filler metal in which the resistance value R is connected between the output terminals t and t of the transformer WT having substantially drooping characteristics has many problems.
本発明のホツトワイヤ溶接方法は、溶加材加熱
用電源として溶加材と溶融プールとの間にアーク
を発生しない程度の低電圧の無負荷電圧であつ
て、しかも溶加材の送給状態、電源電圧等が変動
しても、溶加材への通電電流が略一定となる定電
流特性の電源を使用することによつて、溶加材を
溶融プールへ安定に移行させる溶接方法を提案し
たものである。 The hot wire welding method of the present invention uses a no-load voltage that is low enough to not generate an arc between the filler metal and the molten pool as a power source for heating the filler metal, and also has a feed state of the filler metal. We proposed a welding method that stably transfers the filler metal to the molten pool by using a power source with constant current characteristics that allows the current flowing through the filler metal to remain approximately constant even if the power supply voltage fluctuates. It is something.
以下、本発明のホツトワイヤ溶接方法を、図面
を参照して説明する。本発明のホツトワイヤ溶接
方法は、第３図に示す構成で実施されるが、加熱
用電源６の出力電圧・電流特性として、無負荷電
圧が溶加材と被溶接物との間でアークを発生させ
ない程度の低電圧20V以下で、特にアルゴンガス
中では15V以下に選定し、次に、溶加材を加熱す
る電流としては、50乃至500Aの大電流である加
熱用電源が使用される。そのために、比較的大電
流の範囲では、加熱用電源の電圧・電流特性とし
て10V／50A以上の急傾斜の下降特性を確保する
には、第４図の曲線CPおよびCC特性を有する電
源が好適である。すなわち、加熱用電源の出力特
性は、図示していない出力電流設定器に設定され
た出力電流値によつて定まり、この出力電流の出
力特性と溶加材の負荷特性FW0，FW1又はFW2
との交点が動作点となる。したがつて、加熱用電
源の出力特性としては、この設定出力電流よりも
少ない出力電流の範囲においては、従来の加熱用
電源の出力特性のごとく若干の下降特性を有する
定電圧特性CP又は比較的ゆるやかな下降特性
（10V／100A以下）を有する垂下特性とし、かつ
上記設定出力電流付近においては、10V／50A以
上の急激な下降特性CCにすることが必要である。
このような急激な下降特性を得るためには、加熱
用電源の出力電流を検出して、この検出した出力
電流信号と設定出力電流信号とを比較して、その
差信号により、サイリスタ、トランジスタ等の半
導体制御素子を制御することが必要である。この
ように、電源の出力特性の傾斜を急激に変化させ
ることによつて、無負荷電圧をアークが発生しな
いようにより低く、例えば15V未満にすることが
可能となり、かつ、無負荷電圧をこのように低下
させても、動作点付近では、定電流特性を確保す
ることができ、溶加材の送給状態、電源電圧等の
変動にもかかわらず、溶加材先端の加熱温度を略
一定させて、さらに溶加材を均一に移行させるこ
とができる。 Hereinafter, the hot wire welding method of the present invention will be explained with reference to the drawings. The hot wire welding method of the present invention is carried out with the configuration shown in FIG. A low voltage of 20V or less is selected to avoid the melting, especially 15V or less in argon gas.Next, a heating power source with a large current of 50 to 500A is used to heat the filler metal. Therefore, in a relatively large current range, a power supply with curves CP and CC characteristics in Figure 4 is suitable to ensure a steeply declining characteristic of 10V/50A or more as the voltage/current characteristics of the heating power supply. It is. In other words, the output characteristics of the heating power source are determined by the output current value set in an output current setting device (not shown), and the output characteristics of this output current and the load characteristics of the filler metal FW 0 , FW 1 or FW 2
The point of intersection with is the operating point. Therefore, in the range of output current smaller than this set output current, the output characteristics of the heating power source are constant voltage characteristics CP with a slight drop characteristic like the output characteristics of conventional heating power sources, or relatively constant voltage characteristics. It is necessary to have a drooping characteristic CC that has a gradual decreasing characteristic (10 V/100 A or less) and a rapid decreasing characteristic CC of 10 V/50 A or more near the above set output current.
In order to obtain such a rapid drop characteristic, the output current of the heating power supply is detected, the detected output current signal and the set output current signal are compared, and the difference signal is used to control the thyristor, transistor, etc. It is necessary to control the semiconductor control elements of. In this way, by rapidly changing the slope of the output characteristic of the power supply, it is possible to reduce the no-load voltage to a lower level, e.g. less than 15 V, to avoid arcing, and to reduce the no-load voltage in this way. It is possible to maintain constant current characteristics near the operating point even when the temperature is lowered to 100%, and the heating temperature at the tip of the filler metal remains approximately constant despite fluctuations in filler metal feeding conditions, power supply voltage, etc. As a result, the filler metal can be transferred evenly.
以上のように、本発明のホツトワイヤ溶接方法
によれば、溶加材加熱用電源として溶加材と溶融
プールとの間にアークを発生しない程度の低電圧
の無負荷電圧であつて、しかも溶加材の送給状
態、電源電圧等の変動しても、溶加材への通電電
流が略一定となる定電流特性の電源を使用するこ
とによつて、溶加材の先端の加熱温度を均一にし
て、溶加材を溶融プールへ安定に移行させ、均一
な溶接ビートを得ることができる。 As described above, according to the hot wire welding method of the present invention, the power source for heating the filler metal can be used at a low no-load voltage that does not generate an arc between the filler metal and the molten pool. The heating temperature at the tip of the filler metal can be controlled by using a power source with constant current characteristics, which allows the current flowing through the filler metal to remain approximately constant even if the feed state of the filler metal, power supply voltage, etc. fluctuate. This makes it possible to stably transfer the filler metal to the molten pool and obtain a uniform weld beat.
第１図は従来のホツトワイヤ溶接方法の概略構
成図、第２図は第１図に示す従来のホツトワイヤ
溶接方法に使用された溶加材加熱用電源および変
圧器の出力特性と溶加材の負荷特性との関係を示
す線図、第３図は本発明を適用するホツトワイヤ
溶接方法の概略構成図、第４図は本発明のホツト
ワイヤ溶接方法に適用するための溶加材加熱用電
源の出力特性と溶加材の負荷特性との関係を示す
線図である。
１…非消耗又は消耗電極、２…被溶接物、４…
アーク、５…溶融プール、６…溶加材加熱用電
源、７…溶加材。
Figure 1 is a schematic configuration diagram of the conventional hot wire welding method, and Figure 2 shows the output characteristics of the filler metal heating power source and transformer used in the conventional hot wire welding method shown in Figure 1, and the load on the filler metal. Figure 3 is a schematic configuration diagram of the hot wire welding method to which the present invention is applied, and Figure 4 is the output characteristics of the power supply for heating the filler metal to be applied to the hot wire welding method of the present invention. FIG. 3 is a diagram showing the relationship between the load characteristics of the filler metal and the load characteristics of the filler metal. 1...Non-consumable or consumable electrode, 2...Workpiece, 4...
Arc, 5... Molten pool, 6... Power supply for heating the filler material, 7... Filler material.
Claims (1)
発生したアーク又は被溶接物に形成された溶融プ
ールに、予め加熱した溶加材を送給して溶接する
ホツトワイヤ溶接方法において、前記溶加材と被
溶接物との間に接続された溶加材加熱用電源とし
て、溶加材と被溶接物との間にアークを発生させ
ない低電圧であつて、かつ、その出力電圧・電流
特性が、設定出力電流よりも少ない出力電流範囲
においては、定電圧特性又はゆるやかな下降特性
であり、設定出力電流付近においては、10V／
50A以上の急激な下降特性の定電流特性を有する
電源を使用して、溶接するホツトワイヤ溶接方
法。1 In a hot wire welding method in which a preheated filler metal is fed into an arc generated between a non-consumable or consumable electrode and a workpiece or a molten pool formed on the workpiece, the welding process As a power source for heating the filler metal connected between the filler metal and the workpiece, it is a low voltage that does not generate an arc between the filler metal and the workpiece, and its output voltage and current characteristics are , In the output current range smaller than the set output current, it is a constant voltage characteristic or a gradual decreasing characteristic, and around the set output current, it is 10V /
A hot wire welding method in which welding is performed using a power source with a constant current characteristic of 50A or more with rapid drop-off characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14847280A JPS5772772A (en) | 1980-10-22 | 1980-10-22 | Hot wire welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14847280A JPS5772772A (en) | 1980-10-22 | 1980-10-22 | Hot wire welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5772772A JPS5772772A (en) | 1982-05-07 |
| JPH0241392B2 true JPH0241392B2 (en) | 1990-09-17 |
Family
ID=15453506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14847280A Granted JPS5772772A (en) | 1980-10-22 | 1980-10-22 | Hot wire welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5772772A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59179274A (en) * | 1983-03-30 | 1984-10-11 | Hitachi Ltd | Method and device for welding using hot wire |
| JPS60137576A (en) * | 1983-12-24 | 1985-07-22 | Kobe Steel Ltd | Horizontal position tig welding |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2917455A1 (en) * | 1979-04-30 | 1980-11-13 | Ibm Deutschland | METHOD FOR COMPLETELY CURING GRID DEFECTS IN N-CONDUCTING ZONES OF A SILICON SEMICONDUCTOR DEVICE PRODUCED BY ION IMPLANTATION OF PHOSPHORUS AND RELATED SILICON SEMICONDUCTOR DEVICE |
-
1980
- 1980-10-22 JP JP14847280A patent/JPS5772772A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5772772A (en) | 1982-05-07 |
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