JPH0221909B2 - - Google Patents
Info
- Publication number
- JPH0221909B2 JPH0221909B2 JP17456682A JP17456682A JPH0221909B2 JP H0221909 B2 JPH0221909 B2 JP H0221909B2 JP 17456682 A JP17456682 A JP 17456682A JP 17456682 A JP17456682 A JP 17456682A JP H0221909 B2 JPH0221909 B2 JP H0221909B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- current
- tig
- welding
- pulse
- 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
Links
- 238000003466 welding Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000010953 base metal Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
Description
【発明の詳細な説明】
本発明は溶加材であるワイヤを通電加熱して溶
接を行行うホツトワイヤTIG溶接法に係り、特に
低周波のパルスTIG電流を使用するに好適なホツ
トワイヤTIG溶接法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot wire TIG welding method in which welding is performed by heating a wire as a filler metal, and particularly to a hot wire TIG welding method suitable for using a low frequency pulsed TIG current. .
第１図にホツトワイヤTIG溶接法の基本原理を
示す。溶接電源１により非消耗電極２と母材３間
にアークを発生させ溶融池４が形成される。溶加
材としてのワイヤ５は形成された溶融池に送給さ
れる。この時、別のワイヤ用電源６で母材と給電
チツプ７の間のワイヤに通電し、ワイヤはワイヤ
自身の抵抗発熱で加熱される。このため、通常の
TIG溶接に比較し、ホツトワイヤTIG溶接法はワ
イヤの溶融が促進されるので溶着量を増すことが
できるという特徴をもつている。第２図、第３図
は従来のホツトワイヤTIG溶接のTIG電流ITとワ
イヤ通電電流IWの電流波形の概略である。第２図
はITとIWが直流電流の場合である。この場合TIG
電流とワイヤ電流は常に同時に流れているため、
両者の電流による電磁力により、TIGアークは磁
気干渉を起こし、アークはワイヤ側に引つぱられ
る。このアークの磁気干渉によつて、アークは不
安定となつたり、アークエネルギーによる母材の
溶融が不安定となつたりするという欠点がある。
このアークの磁気干渉を防止するため、TIG電流
ITとワイヤ電流IWを交互に切換えて流す方式があ
る。この方式の電流波形を第３図に示す。第３図
に示すように、両電流をパルス電流化し、かつ位
相をずらして交互に電流を流すことにより、TIG
アークの磁気干渉を防止したものである。この方
式はアークの磁気干渉が小さく優れた方式である
が、TIG電流のパルス周波数とワイヤ電流の周波
数は同じ周波数にする必要がある。従つて20Hz以
下の低周波のパルス電流を用いた溶接の場合、ワ
イヤの通電加熱は低周波のパルス電流で周期的に
行なわれ、通電加熱のむらが生ずるという欠点が
ある。ホツトワイヤTIG溶接はワイヤの加熱によ
りワイヤの溶融を促進させることによつてワイヤ
の送給速度を大にして溶接し、その結果通常の
TIG溶接にくらべ単位時間当りの溶着量を高くす
ることが特徴である。ワイヤ送給速度が大で、パ
ルス周波数が低周波の場合、ワイヤの加熱は断続
的に行なわれる。例えば、ワイヤ送給速度ｖ＝
100mm／sec、母材とワイヤ給電チツプ間のワイヤ
通電長ｌ＝20mmとすると、ワイヤ通電長ｌをワイ
ヤのある一点が通過するに要する時間は0.2秒で
ある。パルス周波数が５Hzとすると、ワイヤの通
電加熱時間は0.1秒となり、送給中のワイヤがワ
イヤ通電長ｌを通過する間に１回のパルス電流で
しか加熱されない。このため、全く加熱されない
で溶融池に送給される部分が生ずる。このような
ワイヤの加熱むらがあると、ワイヤが完全に溶融
せず、溶接ビード形状の不良、ブローホール等の
溶接欠陥の発生の原因となりやすい。ワイヤ通電
長ｌを長くするとワイヤの通電回数が少なくて
も、熱伝導によりワイヤの加熱むらは小さくなる
が、ワイヤの変形が生じ、溶融池に正確にワイヤ
を送給することが困難となり実用的でない。また
パルス周波数を高くすればこの欠点は改善される
が、管の円周全姿勢溶接の場合に代表されるよう
に、パルス電流を用い溶融池の形状を制御して溶
接を行うような場合、10Hz以下（通常は１〜５
Hz）の低いパルス周波数を用いて溶接を行う必要
がある。このような低周波のパルス電流を用いる
場合、第３図の方式ではワイヤの通電加熱のむら
が発生するという欠点がある。 Figure 1 shows the basic principle of hot wire TIG welding. The welding power source 1 generates an arc between the non-consumable electrode 2 and the base material 3, and a molten pool 4 is formed. A wire 5 as filler material is fed into the formed molten pool. At this time, another wire power source 6 energizes the wire between the base material and the power supply chip 7, and the wire is heated by its own resistance heat generation. For this reason, the normal
Compared to TIG welding, the hot wire TIG welding method has the characteristic that the melting of the wire is promoted, so that the amount of welding can be increased. FIGS. 2 and 3 schematically show the current waveforms of the TIG current I T and wire current I W in conventional hot wire TIG welding. Figure 2 shows the case where I T and I W are direct currents. In this case TIG
Since the current and wire current are always flowing at the same time,
The electromagnetic force generated by both currents causes magnetic interference in the TIG arc, and the arc is pulled toward the wire. This magnetic interference of the arc causes the arc to become unstable, and the melting of the base metal due to the arc energy becomes unstable.
To prevent magnetic interference of this arc, TIG current
There is a method in which I T and wire current I W are alternately switched. The current waveform of this method is shown in FIG. As shown in Figure 3, TIG
This prevents magnetic interference of the arc. This method is an excellent method with little magnetic interference from the arc, but the pulse frequency of the TIG current and the frequency of the wire current must be the same frequency. Therefore, in the case of welding using a low-frequency pulsed current of 20 Hz or less, the wire is electrically heated periodically with the low-frequency pulsed current, which has the disadvantage that the electrical heating becomes uneven. Hot wire TIG welding increases the wire feeding speed by heating the wire to accelerate the melting of the wire.
It is characterized by a higher amount of welding per unit time than TIG welding. When the wire feeding speed is high and the pulse frequency is low, heating of the wire is performed intermittently. For example, wire feeding speed v=
Assuming that the wire conduction length l between the base material and the wire power supply chip is 100 mm/sec and 20 mm, the time required for one point of the wire to pass through the wire conduction length l is 0.2 seconds. When the pulse frequency is 5 Hz, the energization heating time of the wire is 0.1 seconds, and the wire being fed is heated by only one pulse current while passing through the wire energization length l. This results in some portions being fed into the molten pool without being heated at all. If there is such uneven heating of the wire, the wire will not be completely melted, which will likely cause welding defects such as poor weld bead shape and blowholes. If the wire energization length l is increased, even if the number of times the wire is energized is small, the heating unevenness of the wire will be reduced due to heat conduction, but the wire will be deformed and it will be difficult to accurately feed the wire into the molten pool, making it impractical. Not. In addition, this drawback can be improved by increasing the pulse frequency, but when welding is performed by controlling the shape of the molten pool using pulsed current, as is typical in the case of pipe circumference welding in all positions, 10 Hz or less (usually 1-5
It is necessary to weld using a low pulse frequency (Hz). When such a low-frequency pulse current is used, the method shown in FIG. 3 has a disadvantage in that the wire is heated unevenly.
本発明の目的は低周波のパルスTIG電流を用い
たホツトワイヤTIG溶接において、ワイヤの加熱
むらをできるだけ小さくし、ワイヤの溶融をスム
ーズに行なわせることにより、良好な溶接部を得
ることにある。 An object of the present invention is to obtain a good welded joint by minimizing uneven heating of the wire and melting the wire smoothly in hot wire TIG welding using a low-frequency pulsed TIG current.
本発明はホツトワイヤTIG溶接において、TIG
電流の１パルス期間内に母材と給電チツプ間のワ
イヤを少なくとも２回以上パルス電流により通電
加熱すればワイヤの加熱むらが少なくなり、ワイ
ヤの溶融がスムーズに行えることを実験的に確認
してなされたものである。 The present invention is suitable for TIG welding in hot wire TIG welding.
It has been experimentally confirmed that if the wire between the base material and the power supply chip is heated with pulsed current at least twice within one current pulse period, the heating unevenness of the wire will be reduced and the wire will be melted smoothly. It has been done.
以下、本発明の実施例について説明する。第４
図は本発明のホツトワイヤTIG溶接法の全体回路
ブロツク図を、第５図は本発明のTIG電流とホツ
トワイヤ電流の電流波形の模式図を示す。第４図
において、非消耗電極が装着されたTIGトーチ１
７と母材３の間には直流電源８及び電流スイツチ
ング回路１０があり、直流電源８からの直流電流
を電流スイツチング回路８によりパルス電流化し
て、母材とTIGトーチ間にパルス電流ITが供給さ
れる。スイツチング回路１０のスイツチング素子
としてはTIG電流のピーク値及びベース値をアナ
ログ制御するためにトランジスタを用いている。
スイツチング回路にはパルス電流制御回路１２が
結線されており、TIG電流のパルス周波数fT、ピ
ーク電流ITP、ベース電流ITB、デユーテイDTが設
定される。このパルス電流制御回路１２からの信
号によりスイツチング回路１０は動作し、母材と
TIGトーチ間にパルス電流を供給している。一方
ワイヤ側にはワイヤ給電チツプ７と母材間に同様
に直流電源９、スイツチング回路１１、ワイヤ電
流制御回路１３が接続されている。ワイヤの送給
は、送給用ローラ１４とワイヤ送給用モータ１
５、送給速度制御回路１６により行なわれる。第
５図にTIG電流とワイヤ電流の電流波形を示す。
TIG電流のパルス周波数１≦fT≦20に対し、ワイ
ヤ電流のパルス周波数fWはfTの１パルス期間T1秒
間に少なくとも２回以上ワイヤの通電加熱を行う
に必要なパルス周波数としている。この場合のワ
イヤ電流のパルス周波数はワイヤ送給速度をｖ
mm／sec、母材と給電部間のワイヤ通電長をｌmm
とすると、fW＝ｋ×ｖ／ｌ、ｋ≧２となる。ワイヤ
通電長ｌは25mm、ワイヤ送給速度100mm／sec、
TIGピーク電流ITP＝400A、TIGベース電流ITB＝
50A、TIGのパルス周波数fT＝２Hz、ワイヤ電流
のピークIWP＝300Aで溶接した場合、fW＝4k、す
なわちfWが８Hz以上で溶接するとワイヤの加熱む
らは小さく、ワイヤの溶融はスムーズに行なわ
れ、溶接欠陥のない良好な溶接部が得られる効果
があることが、わかつた。なおワイヤのパルス周
波数の設定は、ワイヤ送給速度ｖとワイヤ通電長
ｌとからfW＝ｋ×ｖ／ｌで決定できる。第４図では
ワイヤ送給速度の制御回路１６からのワイヤ送給
速度信号を用いてワイヤ電流のパルス周波数を自
動的に決定している。従つてワイヤ送給速度の設
定値を溶接対象箇所に応じて変化する場合でも、
ワイヤ電流のパルス周波数は少なくとも２回の通
電回数が得られるように自動的に設定できるとい
う効果がある。 Examples of the present invention will be described below. Fourth
This figure shows an overall circuit block diagram of the hot wire TIG welding method of the present invention, and FIG. 5 shows a schematic diagram of the current waveforms of the TIG current and hot wire current of the present invention. In Figure 4, TIG torch 1 with non-consumable electrodes attached.
There is a DC power supply 8 and a current switching circuit 10 between the base metal 7 and the base metal 3, and the DC current from the DC power supply 8 is converted into a pulse current by the current switching circuit 8, and a pulse current I T is generated between the base metal and the TIG torch. Supplied. As switching elements of the switching circuit 10, transistors are used for analog control of the peak value and base value of the TIG current.
A pulse current control circuit 12 is connected to the switching circuit, and the pulse frequency f T , peak current I TP , base current I TB , and duty DT of the TIG current are set. The switching circuit 10 is operated by the signal from the pulse current control circuit 12, and the base material and
Pulsed current is supplied between the TIG torches. On the other hand, on the wire side, a DC power supply 9, a switching circuit 11, and a wire current control circuit 13 are similarly connected between the wire power supply chip 7 and the base material. The wire is fed by a feeding roller 14 and a wire feeding motor 1.
5. Performed by the feeding speed control circuit 16. Figure 5 shows the current waveforms of the TIG current and wire current.
While the pulse frequency of the TIG current is 1≦f T ≦20, the pulse frequency f W of the wire current is set to a pulse frequency necessary to heat the wire at least twice in one pulse period T of f T 1 second. The pulse frequency of the wire current in this case is the wire feeding speed v
mm/sec, wire current carrying length between base metal and power supply part is lmm
Then, f W =k×v/l, k≧2. Wire current length l is 25mm, wire feeding speed 100mm/sec,
TIG peak current I TP = 400A, TIG base current I TB =
When welding at 50 A, TIG pulse frequency f T = 2 Hz, and wire current peak I WP = 300 A, f W = 4 k, that is, when welding at f W of 8 Hz or more, the heating unevenness of the wire is small and the wire melts smoothly. It was found that this method was effective in obtaining a good welded joint without welding defects. The setting of the pulse frequency of the wire can be determined from the wire feeding speed v and the current-carrying length l of the wire as follows: f W =k×v/l. In FIG. 4, the wire feed speed signal from the wire feed speed control circuit 16 is used to automatically determine the pulse frequency of the wire current. Therefore, even if the wire feed speed setting value is changed depending on the location to be welded,
There is an advantage that the pulse frequency of the wire current can be automatically set so that at least two times of energization can be obtained.
第１図はホツトワイヤTIG溶接法の原理図、第
２図、第３図は従来のパルス電流波形図、第４図
は本発明の動作、構成を説明する全体回路図、第
５図は本発明の電流波形の模式図である。
１……TIG用直流電源、２……非消耗電極、３
……母材、４……溶融池、５……ワイヤ、６……
ワイヤ用直流電源、７……ワイヤ給電チツプ、８
……TIG用直流電源、９……ワイヤ用直流電源、
１０，１１……電流スイツチング回路、１２，１
３……電流制御回路、１４……ワイヤ送給ロー
ル、１５……ワイヤ送給モータ、１６……ワイヤ
送給速度制御回路、１７……TIGトーチ。
Figure 1 is a principle diagram of the hot wire TIG welding method, Figures 2 and 3 are conventional pulse current waveform diagrams, Figure 4 is an overall circuit diagram explaining the operation and configuration of the present invention, and Figure 5 is the present invention. FIG. 3 is a schematic diagram of the current waveform of FIG. 1...DC power supply for TIG, 2...Non-consumable electrode, 3
... Base material, 4 ... Molten pool, 5 ... Wire, 6 ...
DC power supply for wire, 7... Wire power supply chip, 8
...DC power supply for TIG, 9...DC power supply for wire,
10, 11...Current switching circuit, 12, 1
3... Current control circuit, 14... Wire feeding roll, 15... Wire feeding motor, 16... Wire feeding speed control circuit, 17... TIG torch.
Claims (1)
池に溶加材としてのワイヤを通電加熱しながら送
給して溶接を行なうホツトワイヤTIG溶接法にお
いて、前記消耗電極に流すTIG電流と前記ワイヤ
に流すワイヤ通電電流を低周波のパルス電流と
し、前記TIG電流１パルスに対し前記ワイヤ通電
電流を少なくとも２パルス以上とすることを特徴
とするホツトワイヤTIG溶接法。1 In the hot wire TIG welding method, in which welding is carried out by feeding a wire as a filler metal into the molten pool of a TIG arc weld using a non-consumable electrode while heating it with electricity, the TIG current flowing through the consumable electrode and the wire A hot wire TIG welding method, characterized in that the wire current to be applied is a low frequency pulse current, and the wire current is at least two pulses or more for each pulse of the TIG current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17456682A JPS5964169A (en) | 1982-10-06 | 1982-10-06 | Hot wire tig welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17456682A JPS5964169A (en) | 1982-10-06 | 1982-10-06 | Hot wire tig welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5964169A JPS5964169A (en) | 1984-04-12 |
| JPH0221909B2 true JPH0221909B2 (en) | 1990-05-16 |
Family
ID=15980797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17456682A Granted JPS5964169A (en) | 1982-10-06 | 1982-10-06 | Hot wire tig welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5964169A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2610819B2 (en) * | 1985-12-04 | 1997-05-14 | バブコツク日立株式会社 | Hot wire TIG welding equipment |
| JP5400696B2 (en) * | 2010-04-26 | 2014-01-29 | 株式会社神戸製鋼所 | Consumable electrode type gas shielded arc welding method and consumable electrode type gas shielded arc welding system |
| CN104493368B (en) * | 2014-11-25 | 2017-02-22 | 哈尔滨工程大学 | Plasma-melting electrode electric arc dynamic composite welding device and welding method thereof |
-
1982
- 1982-10-06 JP JP17456682A patent/JPS5964169A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5964169A (en) | 1984-04-12 |
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