JPS61279366A - High frequency pulse welding method - Google Patents

Abstract

PURPOSE:To reduce the difference of an average current value and a peak current value, to decrease the capacity of an output control transistor, etc., and to make a device small in size by executing a high frequency pulse welding by varying a high frequency pulse frequency. CONSTITUTION:Welding currents 11 and 12 are a pulse current of a high frequency and a pulse current of a low frequency, respectively. These pulse currents 11, 12 are supplied by bringing a transistor 4 to an opening/closing control by a signal of a controlling circuit 5. By varying a pulse frequency of the welding current, a difference between an average current value and a peak current value can be reduced, therefore, as for the transistor 4, that which has a small capacity can be used, and also with regard to a capacitor 3, a rectifier 2, a power source transformer 1, etc., as well, those of a low pressure resistance can be used. In this way, a high frequency pulse TIG welding machine can be made small in size.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、高周波パルス溶接方法に関し、特に高周波
数を変化させて溶接する高周波パルス溶接方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-frequency pulse welding method, and particularly to a high-frequency pulse welding method in which welding is performed by changing a high frequency.

〔従来の技術〕[Conventional technology]

従来、この種の溶接方法である高周波パルス直流ＴＩＧ
溶接方法は、第３図に示す高周波パルス直流ＴＩＧ溶接
機の回路で、第４図（ａ）に示す波形の溶接電流を用い
て溶接していた。第３図において、（１）は電源変圧器
、（２）はこの電源変圧器（１）によシ降圧された交流
を直流に変換する整流器、（３）は整流器（２）によシ
変換された直流を平滑するコンデンサ、（４）は直流を
開閉しパルスを作る出力制御トランジスタ、（５）はパ
ルスを作るトランジスタ（４）を制御する制御回路、（
６）は高周波パルスのアークを飛ばす溶接トーチ、（７
）は溶接トーチ（６）により溶接を行う母材である。Conventionally, this type of welding method is high-frequency pulsed direct current TIG.
Welding was carried out using a high-frequency pulsed direct current TIG welding machine circuit shown in FIG. 3 using a welding current having a waveform shown in FIG. 4(a). In Figure 3, (1) is a power transformer, (2) is a rectifier that converts the AC voltage stepped down by the power transformer (1) into DC, and (3) is a rectifier that converts the AC voltage stepped down by the power transformer (1) to DC. (4) is an output control transistor that opens and closes the DC current and creates pulses; (5) is a control circuit that controls the transistor (4) that creates pulses;
6) is a welding torch that emits a high-frequency pulsed arc; (7)
) is the base material to be welded with the welding torch (6).

第４図（ａ）において、（８）は高周波パルス高レベル
電流、（９）は高周波パルス低レベル電流、（１０は平
均溶接電流レベルである。In FIG. 4(a), (8) is a high-frequency pulse high-level current, (9) is a high-frequency pulse low-level current, and (10 is an average welding current level).

次に動作について説明する。電源変圧器（１）により降
圧された交流を整流器（２）によシ直流に変換し、コン
デンサ（３）によυ平滑する。平滑された直流を制御回
路（５）の信号によりトランジスタ（４）が開閉し高周
波パルス全作シ溶接トーチ（６）及び母材（７）に送シ
溶接アークを発生させる。Next, the operation will be explained. The alternating current stepped down by the power transformer (1) is converted into direct current by the rectifier (2), and smoothed by the capacitor (3). A transistor (4) opens and closes the smoothed direct current according to a signal from a control circuit (5), and a high-frequency pulse generates a welding arc in the welding torch (6) and the base metal (7).

溶接アークには、第４図（ａ）の様な波形の溶接電流１
１が出力される。すなわち、高周波パルス高レベル電流
（８）と高周波パルス低レベル電流（９）と交互に通電
し、低周波パルスを重畳させていた。、そして、母材（
７）の溶融状態は第４図（ｂ）に示すような結果が得ら
れていた。The welding arc has a welding current 1 with a waveform as shown in Figure 4(a).
1 is output. That is, a high-frequency pulse high-level current (8) and a high-frequency pulse low-level current (9) are alternately applied, and the low-frequency pulses are superimposed. , and the base material (
Regarding the melted state of 7), the results shown in FIG. 4(b) were obtained.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の高周波パルス直流ＴＩＧ溶接方法では第４図（ａ
）Ｋ示す様に、平均溶接電流が高周波高レベル電流と高
周波低レベル電流の中間となる。つまり、平均電流値と
ピーク電流値の差が大きく、出力制御トランジスタ等の
容量が大きくなる。したがって、高周波パルス直流ＴＩ
Ｇ溶接機器が大型になるなどの問題点があった。In the conventional high-frequency pulsed DC TIG welding method, the welding process shown in Fig. 4 (a)
)K, the average welding current is between the high frequency high level current and the high frequency low level current. In other words, the difference between the average current value and the peak current value is large, and the capacitance of the output control transistor and the like becomes large. Therefore, the high frequency pulsed DC TI
There were problems such as the large size of the G-welding equipment.

この発明は上記のような従来のものの問題点を解決する
念めになされ念もので、パルス周波数ヲ変化させて溶接
すること罠よシ、平均電流と高レベル電流の差を小さく
シ、高周波パルス溶接機器を小型化出来る溶接方法を提
供することを目的としている。This invention was made with the intention of solving the problems of the conventional methods as described above. The purpose is to provide a welding method that can downsize welding equipment.

〔問題点を解決する次めの手段〕[Next method to solve the problem]

この発明に係る高周波パルス溶接方法は、高周波パルス
周波数を変化させて溶接するものである。The high-frequency pulse welding method according to the present invention performs welding by changing the high-frequency pulse frequency.

〔作用〕[Effect]

この発明においては、高周波パルス周波数を変化させて
溶接するものであるから、平均を流値とピーク電流値の
差が小さくなる。し次がって、出力制御トランジスタ尋
の容量が小さくなシ高周波パルス溶接機器が小型になる
。In this invention, since welding is performed by changing the high-frequency pulse frequency, the difference between the average current value and the peak current value becomes small. In turn, high-frequency pulse welding equipment with a small capacity output control transistor has become smaller.

〔実施例〕〔Example〕

第１図（ａ）はこの発明の一実施例を示す高周波パルス
電流の波形図、第１図（ｂ）は第１図（ａ）　Ｋ示す高
周波パルス電流による母材の溶融状態を示す説明図であ
る。FIG. 1(a) is a waveform diagram of a high-frequency pulsed current showing an embodiment of the present invention, and FIG. 1(b) is an explanatory diagram showing the melting state of the base material due to the high-frequency pulsed current shown in FIG. 1(a). It is.

第１図（＆）において、工、は溶接電流、αυは高レベ
ル周波数電流、つまり高い周波数のパルス電流、（Ｌ３
は低レベル周波数電流、つまり低い周波数のパルス電流
である。このパルス電流αυ及びα２は周期的に変化し
ておシ、第６図に示す制御回路（５）の信号によりトラ
ンジスタ（４）ヲ開閉制御して供給される。In Fig. 1 (&), Δ is the welding current, αυ is the high-level frequency current, that is, the high-frequency pulse current, (L3
is a low level frequency current, that is, a low frequency pulsed current. These pulse currents αυ and α2 change periodically and are supplied by controlling the opening and closing of a transistor (4) by a signal from a control circuit (5) shown in FIG.

この発明では、溶接電流工２のパルス周波数を変化させ
ているから、平均電流値α３とピーク電流値との差が小
さくなる。したがって、トランジスタ（４）は容量の小
さいものが使え、さらにコンデンサ（３）、整流器（２
）、電源変圧器（１）など本耐圧の低いものが使えるか
ら、高周波パルスＴＩＧ溶接機器が小型になる。In this invention, since the pulse frequency of the welding current operator 2 is changed, the difference between the average current value α3 and the peak current value becomes small. Therefore, a transistor (4) with a small capacity can be used, as well as a capacitor (3) and a rectifier (2).
), power transformer (1), and other devices with low breakdown voltage can be used, making the high-frequency pulse TIG welding equipment more compact.

一方、高周波パルスＴＩＧ溶接方法において、パルス周
波数が高くなると電磁ピンチ効果も高くなることが実験
によシ確かめられている。ある溶接条件のもとにおける
実験結果を第２図に示す。On the other hand, in the high-frequency pulsed TIG welding method, it has been experimentally confirmed that as the pulse frequency increases, the electromagnetic pinch effect also increases. Figure 2 shows the experimental results under certain welding conditions.

上述のように、電磁ピンチ効果は周波数が高くなると高
くなるので、母材の溶融状態は第１図（ｂ）に示すよう
に、低レベル周波数α２では溶融状態α荀が得られ高レ
ベル周波数αＢでは溶融状態α９が得られる。したがっ
て、周波数を変える事によシ低周波パルスを付加したの
と同一の入熱制御が出来る。As mentioned above, the electromagnetic pinch effect increases as the frequency increases, so the molten state of the base material is as shown in Fig. 1(b).At the low level frequency α2, the molten state αX is obtained, and at the high level frequency αB In this case, a molten state α9 is obtained. Therefore, by changing the frequency, the same heat input control as adding a low frequency pulse can be achieved.

ここで、電磁ピンチ効果とは溶融金属（またはアーク柱
）中を流れる電流による電磁力のために溶融金属導体（
ま次はアーク柱を形成するガス体）が圧縮され、導体（
アーク柱）内の圧力が上昇するために生ずる力学的効果
を言う。Here, the electromagnetic pinch effect refers to the molten metal conductor (or arc column) due to the electromagnetic force caused by the current flowing in the molten metal (or arc column).
Next, the gas body (forming the arc column) is compressed, and the conductor (
This refers to the mechanical effect that occurs due to the increase in pressure within the arc column.

また、「高レベル周波数」「低レベル周波数」とは、こ
の実施例では高周波パルス周波数を周期的に変化させて
溶接するが、その時の「高い周波数」と「低い周波数」
？意味する。例えば、１０に＆と１１ｃ＆を周期的に変
化させた場合ハ１０に＆をｒ高レベル周波数」、１に＆
を「低レベル周波数」と称する。これは１０　ｋｆｌｔ
は１　ｋ＆に比べて、電磁ピンチ効果が高いので「高レ
ベル周波数」と表現している。In addition, "high level frequency" and "low level frequency" refer to the "high frequency" and "low frequency" in this embodiment, in which welding is performed by periodically changing the high frequency pulse frequency.
? means. For example, if & and 11c & are changed periodically to 10, & is changed to 10, r is high level frequency, and & is changed to 1 &
is called the "low level frequency". This is 10 kflt
is expressed as a "high level frequency" because it has a higher electromagnetic pinch effect than 1k&.

なお、上記実施例では周波数を周期的に変化させている
が、連続的に変化させてもよい。In addition, although the frequency is changed periodically in the above embodiment, it may be changed continuously.

また、上記実施例はＴＩＧ溶接について述べたが、これ
に限らずＭＩＧ溶接、ＭＡＧ溶接、プラズマ溶接に実施
しても同様の効果が得られる。Further, although the above embodiments have been described with respect to TIG welding, the present invention is not limited to this, and similar effects can be obtained by performing MIG welding, MAG welding, and plasma welding.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明したとお９、高周波パルス周波数を
変化させて溶接するようにしたから、平均電流値とピー
ク電流値の差が小さく、高周波パルス溶接機器の出力制
御トランジスタ等の容量が小さくなシ装置が安価に出来
、また小型化出来る。As explained above, this invention performs welding by changing the high-frequency pulse frequency, so the difference between the average current value and the peak current value is small, and the capacity of the output control transistor of high-frequency pulse welding equipment is small. The device can be made inexpensively and downsized.

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

第１図（ａ）はこの発明の一実施例を示す高周波パルス
電流の波形図、第１図（ｂ）は第１図（ＩＬ）に示す高
周波パルス電流による母材の溶融状態を示す説明図、第
２図は溶接電流の周波数とアーク圧力との関係を示すグ
ラフ、第６図は高周波パルス直流ＴＩＧ溶接機の回路図
、第４図（ａ）は従来の高周波パルス溶接方法における
溶接電流の波形図、第４図（ｂ）は第４図（励に示す高
周波パルス電流による母材の溶融状態を示す説明図であ
る。 図において、α９は高レベル周波数電流、（ｌｚは低レ
ベル周波数電流、α国は平均溶接電流レベル、工。 は溶接電流である。 なお、図中、同一符号は同−又は相当部分を示すＯ 代理人　弁理士　佐　藤　正　年 第１図 （ａ） （ｂ）FIG. 1(a) is a waveform diagram of a high-frequency pulsed current showing an embodiment of the present invention, and FIG. 1(b) is an explanatory diagram showing the melting state of the base material due to the high-frequency pulsed current shown in FIG. 1(IL). , Figure 2 is a graph showing the relationship between welding current frequency and arc pressure, Figure 6 is a circuit diagram of a high-frequency pulsed DC TIG welding machine, and Figure 4(a) is a graph showing the relationship between welding current frequency and arc pressure. The waveform diagram, FIG. 4(b) is an explanatory diagram showing the melting state of the base material due to the high-frequency pulse current shown in FIG. , country α is the average welding current level, and . is the welding current. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

【特許請求の範囲】[Claims] 溶接電流として高周波パルスを使用する高周波パルス溶
接方法において、高周波パルス周波数を変化させて溶接
することを特徴とした高周波パルス溶接方法。A high-frequency pulse welding method that uses a high-frequency pulse as a welding current, and is characterized in that welding is performed by changing the high-frequency pulse frequency.