DK152413B - TIG WELDING WELDING SYSTEM - Google Patents

TIG WELDING WELDING SYSTEM Download PDF

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Publication number
DK152413B
DK152413B DK274283A DK274283A DK152413B DK 152413 B DK152413 B DK 152413B DK 274283 A DK274283 A DK 274283A DK 274283 A DK274283 A DK 274283A DK 152413 B DK152413 B DK 152413B
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Denmark
Prior art keywords
welding
current
circuit
weld
short
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DK274283A
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Danish (da)
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DK274283A (en
DK274283D0 (en
Inventor
Heini Edberg
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Heini Edberg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heini Edberg filed Critical Heini Edberg
Priority to DK274283A priority Critical patent/DK152413B/en
Publication of DK274283D0 publication Critical patent/DK274283D0/en
Priority to JP50223484A priority patent/JPS60501548A/en
Priority to DE19843490272 priority patent/DE3490272T1/en
Priority to DE19843490272 priority patent/DE3490272C2/de
Priority to GB08503548A priority patent/GB2156607B/en
Priority to PCT/DK1984/000049 priority patent/WO1985000024A1/en
Priority to AU30173/84A priority patent/AU565763B2/en
Priority to US06/711,470 priority patent/US4628180A/en
Priority to FR8409336A priority patent/FR2548067B1/en
Priority to CA000456684A priority patent/CA1228896A/en
Publication of DK274283A publication Critical patent/DK274283A/en
Priority to FI850602A priority patent/FI850602L/en
Priority to SE8500692A priority patent/SE8500692D0/en
Priority to NO850569A priority patent/NO850569L/en
Publication of DK152413B publication Critical patent/DK152413B/en

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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
    • B23K9/067—Starting the arc
    • B23K9/0671—Starting the arc by means of brief contacts between the electrodes
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Arc Welding Control (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Description

Den foreliggende opfindelse angår elektronisk styring af startprocessen ved TIG-svejsning, hvor en wolframelektrode bringes til kortvarig berøring med et svejseemne og derefter løftes bort fra svejseemnet for at etablere en lysbue.The present invention relates to electronic control of the starting process by TIG welding, wherein a tungsten electrode is brought into short-term contact with a weld blank and then lifted away from the weld blank to establish an arc.

Kendte svejsesystemer til TIG-svejsning kan opdeles i to systemer afhængig af måden svejsningen startes på. Det ene system bruger skrabetænding, hvor lysbuen etableres ved at skrabe elektroden mod svejseemnet til gnist opstår. Denne metode bevirker dog, at der opstår "sug" i materialet ved start og stop, ligesom der afsættes wolfram-materiale på svejseemnet, hvilket betyder at svejsningen får en ringere kvalitet.Known welding systems for TIG welding can be divided into two systems depending on the way the welding is started. One system uses scraper ignition where the arc is established by scraping the electrode against the weld until spark arises. However, this method causes "suction" to occur in the material at start and stop, and tungsten material is deposited on the weld, which means that the weld has a poorer quality.

Desuden må svejseelektroden jævnligt udtages og slibes i facon. Et andet system foregår med en berøringsfri opstart ved hjælp af en højspændingsgenerator, som ved etablering af en gnist til svejseemnet starter lysbuen. Ulempen ved dette system er at gnisten vil køre rundt i en cirkel på svejseemnet, hvorved man ikke præcist kan kontrollere hvor svejsningen påbegyndes. Desuden er dette system meget kostbart.In addition, the welding electrode must be regularly removed and sanded in shape. Another system takes place with a non-contact start-up by means of a high-voltage generator, which, when establishing a spark for the weld, starts the arc. The disadvantage of this system is that the spark will rotate in a circle on the welding blank, whereby it is not possible to precisely control where the welding begins. Moreover, this system is very expensive.

Andre lysbuesvejsemetoder, som anvender afsmeltende svejseelektroder, har helt andre problemer ved skrabe-tænding. De metoder til lysbuetænding, som er beskrevet for disse svejsemetoder, og som anvender en kortvarig, kraftig energiimpuls, når elektroden berører svejseemnet, er helt uanvendelige ved TIG-svejsning.Other arc welding methods using melting welding electrodes have completely different problems in scraping ignition. The arc ignition methods described for these welding methods, which employ a short-lived, powerful energy pulse when the electrode touches the weld, are completely useless in TIG welding.

Den kraftige energiimpuls ved kortslutningen, som er nødvendig for at smelte spidsen af en afsmeltende svejseelektrode og overfladen af svejseemnet, er tværtimod højst uønskelig ved TIG-svejsning, hvor den ville fremkalde en utilladelig forurening af emnets overflade med wolframsprøjt.On the contrary, the strong short-circuit energy pulse needed to melt the tip of a melting welding electrode and the surface of the weld is highly undesirable in TIG welding, where it would cause unpolluted contamination of the workpiece surface by tungsten spray.

Fra engelsk patentskrift nr. 2.054.293 kendes et svej-sesystem hvor man modvirker skrabetændingens ulemper.English patent specification 2,054,293 discloses a welding system which counteracts the disadvantages of scratching.

Ved dette system opnår man en blød opstart, ved at man tilkobler en høj spænding via en separat transformervikling med tilhørende ensretterdel, synkroniseret med netfrekvensen, hvorefter man, når lysbuen er etableret, elektronisk kobler om til et normalt, strømstignings-automatisk kredsløb, med en ny ensretterdel. Dette er imidlertid en ret kostbar metode til avanceret skrabe-tænding, som også inkluderer en dyr drosselspole. Ligeledes har brugeren mulighed for, at få et elektrisk stød, hvis man anvender tilsatsmateriale.This system achieves a soft start by connecting a high voltage via a separate transformer winding with associated rectifier part, synchronized with the mains frequency, and then, when the arc is established, electronically switches to a normal, rise-automatic circuit, with a new rectifier part. However, this is a rather expensive method of advanced scratch ignition, which also includes an expensive coil coil. Likewise, the user has the opportunity to receive an electric shock when using additive material.

Engelsk patentskrift nr. 758.300 beskriver en lysbue-svejsemetode, hvor en afsmeltende elektrodetråd bringes til berøring med et svejseemne. Under denne berøring startes lysbuen ved hjælp af en kortvarig, kraftig kortslutningsstrøm, som er mindst det dobbelte af den forud indstillede svejsestrøm.English Patent No. 758,300 discloses an arc welding method in which a melting electrode wire is brought into contact with a weld blank. During this touch, the arc is started by means of a short-lived, powerful short-circuit current which is at least twice the preset welding current.

Tysk offentliggørelsesskrift nr. 2.407.703 beskriver en ganske tilsvarende startmetode for en afsmeltende svejseelektrode med anvendelse af en kortvarig, høj kortslutningsstrøm under elektrodens berøring af arbejdsstykket.German Publication No. 2,407,703 describes a quite similar starting method for a melting welding electrode using a short, high short-circuit current during contact of the workpiece by the electrode.

Tysk offentliggørelsesskrift nr. 3.219.232 beskriver et elektronisk kredsløb til forbedring af svejsestrømmen fra en roterende svejsegenerator uden kommutator. Fig.German Publication No. 3,219,232 describes an electronic circuit for improving welding current from a rotary welding generator without a commutator. FIG.

1 viser den karakteristiske strømkurve fra en generator med kommutator, når en afsmeltende elektrode bringes til berøring med et svejseemne. En tilstrækkelig kraftig e-nergiimpuls under kortslutningen er i stand til at smelte elektrodespidsen og overfladen af svejseemnet, således at der etableres en svejselysbue.1 shows the characteristic current curve of a generator with a commutator when a melting electrode is brought into contact with a welding blank. A sufficiently strong e-energy pulse during the short circuit is capable of melting the electrode tip and the surface of the weld blank, thus establishing a welding arc.

Fig. 2 viser tilsvarende den uønskede strømkurve for en svejsegenerator uden kommutator. Den smalle impuls af kortslutningsenergi er utilstrækkelig til at sikre lysbuetændingen. Fig. 4 viser, hvorledes dette forhold vil kunne forbedres ved at tilføje det opfundne elektroniske kredsløb.FIG. 2 shows correspondingly the undesired power curve of a welding generator without a commutator. The narrow pulse of short-circuit energy is insufficient to secure the arc ignition. FIG. 4 shows how this ratio could be improved by adding the inventive electronic circuit.

De ovenfor beskrevne kortslutnings-startprocesser ville være højst uønskede ved TIG-svejsning, hvor den kraftige energiimpuls ville smelte elektrodespidsen og forårsage en kraftig wolframforurening af svejseemnet.The short-circuit starting processes described above would be highly undesirable in TIG welding, where the strong energy impulse would melt the electrode tip and cause severe tungsten contamination of the weld.

Strømmen i svejsekredsløbet, i de ovenfor beskrevne patentskrifter, bliver ikke afbrudt under startprocessen, og den anvendes ikke til styring af svejsestrømkilden.The current in the welding circuit, in the patents described above, is not interrupted during the start-up process and it is not used to control the welding current source.

Problemet ved TIG-svejsning er - i modsætning til andre lysbuesvejsemetoder - at opnå en "blød opstart" uden nogen kraftig energiimpuls, så længe wolframelektroden berører svejseemnet.The problem with TIG welding - unlike other arc welding methods - is to obtain a "soft start" without any strong energy impulse as long as the tungsten electrode touches the weld.

Dette problem er blevet effektivt løst ved den foreliggende opfindelse derved, at der ikke anvendes en høj spænding ved start, ligesom reguleringen foregår som en strømregulering.This problem has been effectively solved by the present invention in that a high voltage is not used at start-up, just as the regulation is carried out as a current control.

Den foreliggende opfindelse er ejendommelig ved, at der under berøring med svejseemnet sendes en lav kortslutningsstrøm, fortrinsvis på 3 - 8 A, gennem svejsekredsløbet, samt derved, at afbrydelsen af den nævnte kortslutningsstrøm anvendes til at styre svejsestrømkilden til at forøge strømmen i svejsekredsløbet til en værdi, som er højere end den forud indstillede strømstyrke for selve svejseprocessen, og derpå, efter en kort tidsperiode, at sænke strømstyrken, og derefter opregulere til den nævnte forud indstillede værdi.The present invention is characterized in that, when in contact with the weld, a low short circuit current, preferably 3 - 8 A, is sent through the welding circuit, and in that the interruption of said short circuit current is used to control the welding current source to increase the current in the welding circuit. value which is higher than the preset current for the welding process itself, and then, after a short period of time, lowers the current, and then up-regulates to said preset value.

Opfindelsen er endvidere karakteristisk ved, at enhver senere kontakt mellem wolframelektroden og svejseemnet under selve svejseprocessen anvendes til at styre svejsestrømkilden til øjeblikkelig at bringe strømmen i svejsekredsløbet tilbage til den i krav 1 nævnte lave kortslutningsstrømstyrke på fortrinsvis 3 - 8 A.The invention is further characterized in that any subsequent contact between the tungsten electrode and the weld during the welding process itself is used to control the welding current source to immediately bring the current in the welding circuit back to the low short circuit current of claim 3, preferably 3 to 8 A.

Når kontakten på svejsehåndtaget slippes, sker der en automatisk strømsænkning, hvilket bevirker, at svejsestrømmen langsomt sænkes til grundstrømsniveau, hvorefter svejsningen ophører. Strømsænkningsfunktionen bevirker, at man undgår "sug" i materialet.When the contact of the welding handle is released, an automatic current lowering occurs, which causes the welding current to slowly lower to the ground current level, after which the welding stops. The lowering function prevents "suction" in the material.

Under svejseforløbet med forudindstillet svejsestrøm er det muligt ved trigning med brænderkontakt, at pulsere med svejsestrømmen for at styre smeltebadet. Kontrolkredsløbet regulerer ligeledes gasstrømningen i magnetventilen således, at man får både for- og efter-strømning af argon. Dette for at lette start, samt for at undgå iltning af elektroden under afkøling.During the welding process with preset welding current, it is possible to pulse with the welding current to trigger the welding current to control the melt bath. The control circuit also regulates the gas flow in the solenoid valve so that both pre- and post-flow of argon are obtained. This is to facilitate starting, as well as to prevent oxygenation of the electrode during cooling.

Opfindelsens fordele består i at "sug" undgås, og man på millimeter kan bestemme hvor svejsningen skal starte.The advantages of the invention are that "suction" is avoided and it is possible to determine where the welding should start in millimeters.

Opfindelsen vil i det følgende blive nærmere beskrevet i henhold til tegningen som viser et blokdiagram til brug ved udøvelse af opfindelsen.The invention will now be described in more detail in accordance with the drawing which shows a block diagram for use in the practice of the invention.

Svejsesystemet skal tilsluttes en thyristerstyret svejseensretter med internt grundstrømskredsløb. Svejseforløbet er beskrevet med funktionsomskifter 11 i stilling TIG-svejsning. Wolframelektroden på svejsehåndtaget 6 placeres på svejseemnet. Afbryder på svejsehåndtaget 1 betjenes, og holdekredsløb 2 aktiveres. Derved åbner magnet ventilen 3, og gasforstrømningstiden (kreds 4) begynder. Efter endt gasforstrømning aktiveres grundstrøms- kredsløb 5, der tænder for grundstrøm til elektroden 6. Når elektroden løftes ganske lidt fra svejseemnet aktiveres svejsebue og tomgangsspændingskontrol 7.The welding system must be connected to a thyrister controlled welding rectifier with internal ground current circuit. The welding process is described with function switch 11 in position TIG welding. The tungsten electrode on the welding handle 6 is placed on the welding blank. Switch on welding lever 1 is operated and retaining circuit 2 is activated. In this way, the magnet valve 3 opens and the gas flow time (circuit 4) begins. After gas flow is completed, ground current circuit 5, which turns on ground current to the electrode 6. When the electrode is lifted slightly from the weld, welding arc and idle voltage control 7 are activated.

Denne aktiverer startpulskredsløb 8. Dette medfører, at svejsestrømskredsløb 9 kortvarigt hæver svejsestrømmen for at etablere en stabil svejselysbue. Efter at stabil lysbue er opnået, falder strømmen til lidt over grundstrømsværdi. Samtidig med at lysbuen etableres, starter svejselysbuekontrol 7 for strømstigningsautomatikken 10. Dette medfører, at svejsestrømmen i løbet af kort tid stiger til forudindstillet værdi - regulering 12.This activates starting pulse circuit 8. This causes the welding current circuit 9 to briefly raise the welding current to establish a stable welding arc. After stable arc is obtained, the current drops to slightly above ground current value. At the same time that the arc is being established, the welding arc control 7 starts for the current rise automatic 10. This causes the welding current to rise to a preset value control in a short time.

Når man ønsker at stoppe svejseforløbet, afbrydes TIG-brænderkontakt 1, hvorved strømsænkningsreguleringen 10 begynder nedregulering gennem reguleringskredsløbet 9. Når regulering til grundstrømsniveau er nået, nulstilles holdekredsløb 2, hvorved grundstrømskredsløb 5 afbryder for grundstrømmen i svejseensretteren. Samtidig begynder gasefterstrømningstiden 4. Derefter afbrydes magnetventil 3 efter endt gasefterstrømning.When it is desired to stop the welding process, TIG burner switch 1 is switched off, whereby the current lowering control 10 starts down regulation through the control circuit 9. When control to ground current level is reached, holding circuit 2 is reset, whereby basic current circuit 5 switches off for the basic current in welding. At the same time, the gas flow time 4 begins. Then the solenoid valve 3 is disconnected after the gas flow has ended.

Denne efterstrømningstid hindrer iltning af elektroden under afkøling.This post-flow time prevents oxygenation of the electrode during cooling.

Ved anvendelse af systemet til hæftesvejsning stilles funktionsomskifter 11 i stilling hæftesvejsning. Svejseforløbet arbejder på samme måde, som ved TIG-svejs-ning, dog forkortes strømstignings- og strømsænkningsautomatikken - tiden til milisekunder.When using the booklet welding system, function switch 11 is set to booklet welding. The welding process works in the same way as with TIG welding, however, the current increase and decrease of the automatic cut-off is shortened - the time to milliseconds.

Ved anvendelse af systemet til elektrodesvejsning stilles funktionsomskifter 11. i stilling elektrodesvejsning. Dette medfører, at grundstrømskredsløb 5 er konstant aktiveret. Strømstigningsautomatikken 10 samt gasreguleringskredsløb 4 er udkoblet. Man kan nu udføre normal elektrodesvejsning med tilkoblet udstyr.When using the system for electrode welding, function switch 11. places electrode welding. This causes ground current circuit 5 to be constantly activated. The power rise automatic 10 and gas control circuit 4 are switched off. Normal electrode welding can now be performed with connected equipment.

Claims (2)

1. Fremgangsmåde til elektronisk styring af startprocessen ved TIG-svejsning, hvor en wolframelektrode bringes til kortvarig berøring med et svejseemne og derefter løftes bort fra svejseemnet for at etablere en lysbue, kendetegnet ved, at der under berøringen med svejseemnet sendes en lav kortslutningsstrøm, fortrinsvis på 3 - 8 A, gennem svejsekredsløbet, samt derved, at afbrydelsen af den nævnte kortslutningsstrøm anvendes til at styre svejsestrømkilden til at forøge strømmen i svejsekredsløbet til en værdi, som er højere end den forud indstillede strømstyrke for selve svejseprocessen, og derpå, efter en kort tidsperiode at sænke strømstyrken, og derefter opregulere til den nævnte forud indstillede værdi.A method of electronically controlling the starting process of TIG welding, wherein a tungsten electrode is brought into short-term contact with a weld and then lifted away from the weld to establish an arc, characterized in that during the contact with the weld, a low short-circuit current is sent. 3 to 8 A, through the welding circuit, and thereby interrupting said short-circuit current to control the welding current source to increase the current in the welding circuit to a value higher than the preset current of the welding process itself, and then after a short time period to lower the current, and then up-regulate to the aforementioned preset value. 2. Fremgangsmåde til elektronisk styring ifølge krav 1, kendetegnet ved, at enhver senere kontakt mellem wolframelektroden og svejseemnet under selve svejseprocessen anvendes til at styre svejsestrømkilden til øjeblikkelig at bringe strømmen i svejsekredsløbet tilbage til den i krav 1 nævnte lave kortslutningsstrømstyrke på fortrinsvis 3 - 8 A.Electronic control method according to claim 1, characterized in that any subsequent contact between the tungsten electrode and the weld during the welding process itself is used to control the welding current source to immediately return the current in the welding circuit to the low short circuit current of claim 1, preferably 3 - 8. A.
DK274283A 1983-06-15 1983-06-15 TIG WELDING WELDING SYSTEM DK152413B (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
DK274283A DK152413B (en) 1983-06-15 1983-06-15 TIG WELDING WELDING SYSTEM
DE19843490272 DE3490272T1 (en) 1983-06-15 1984-05-25 Welding system for TIG welding
AU30173/84A AU565763B2 (en) 1983-06-15 1984-05-25 Welding system for tig welding
US06/711,470 US4628180A (en) 1983-06-15 1984-05-25 Welding system for TIG welding
DE19843490272 DE3490272C2 (en) 1983-06-15 1984-05-25
GB08503548A GB2156607B (en) 1983-06-15 1984-05-25 Welding system for tig welding
PCT/DK1984/000049 WO1985000024A1 (en) 1983-06-15 1984-05-25 Welding system for tig welding
JP50223484A JPS60501548A (en) 1983-06-15 1984-05-25 Teig welding equipment
FR8409336A FR2548067B1 (en) 1983-06-15 1984-06-14 TUNGSTEN ARC WELDING SYSTEM
CA000456684A CA1228896A (en) 1983-06-15 1984-06-15 Welding system for tig-welding
FI850602A FI850602L (en) 1983-06-15 1985-02-13 SVETSNINGSSYSTEM FOER TIG-SVETSNING.
SE8500692A SE8500692D0 (en) 1983-06-15 1985-02-14 TIG WELDING WELDING SYSTEM
NO850569A NO850569L (en) 1983-06-15 1985-02-14 WELDING TIG WELDING SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK274283 1983-06-15
DK274283A DK152413B (en) 1983-06-15 1983-06-15 TIG WELDING WELDING SYSTEM

Publications (3)

Publication Number Publication Date
DK274283D0 DK274283D0 (en) 1983-06-15
DK274283A DK274283A (en) 1984-12-16
DK152413B true DK152413B (en) 1988-02-29

Family

ID=8115309

Family Applications (1)

Application Number Title Priority Date Filing Date
DK274283A DK152413B (en) 1983-06-15 1983-06-15 TIG WELDING WELDING SYSTEM

Country Status (11)

Country Link
JP (1) JPS60501548A (en)
AU (1) AU565763B2 (en)
CA (1) CA1228896A (en)
DE (2) DE3490272C2 (en)
DK (1) DK152413B (en)
FI (1) FI850602L (en)
FR (1) FR2548067B1 (en)
GB (1) GB2156607B (en)
NO (1) NO850569L (en)
SE (1) SE8500692D0 (en)
WO (1) WO1985000024A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4809014B2 (en) 2005-07-29 2011-11-02 株式会社ダイヘン Arc start control method for robot welding

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
BE532472A (en) * 1953-10-14
GB881531A (en) * 1958-11-21 1961-11-08 Rolls Royce Improvements in and relating to gas shielded arc welding
DE1565062A1 (en) * 1965-04-23 1970-01-15 Siemens Ag Arrangement for arc stabilization of controllable multi-process welding rectifiers
DE1615363C3 (en) * 1967-07-04 1974-11-07 Messer Griesheim Gmbh, 6000 Frankfurt Device for stabilizing and igniting welding arcs using current pulses
DE1937879B2 (en) * 1969-07-25 1970-10-22 Kurt Stork Stabilizing arc circuit for aluminium welding - with non-consumable tungsten electrode
DE2407703A1 (en) * 1974-02-18 1975-08-28 Ewert Poort Arc initiator for welding apparatus - arc struck with apparatus at maximum output is subsequently reduced to chosen output
DE2459309A1 (en) * 1974-12-14 1976-06-16 Messer Griesheim Gmbh Arc ignition for arc welding - with current supply set at lower value while electrodes touch to reduce loading
US4282569A (en) * 1979-07-12 1981-08-04 Union Carbide Corporation Constant current welding power supply with an upslope starting current
AT373109B (en) * 1981-05-22 1983-12-27 Elin Union Ag CIRCUIT ARRANGEMENT FOR RAISING THE IGNITION CURRENT IN A BRUSHLESS ROTATING WELDING MACHINE
JPS5870975A (en) * 1981-10-23 1983-04-27 Ishikawajima Harima Heavy Ind Co Ltd Emergency stopping method in tig welding

Also Published As

Publication number Publication date
FI850602A0 (en) 1985-02-13
AU565763B2 (en) 1987-09-24
AU3017384A (en) 1985-01-11
CA1228896A (en) 1987-11-03
FI850602L (en) 1985-02-13
GB2156607B (en) 1986-11-12
WO1985000024A1 (en) 1985-01-03
DK274283A (en) 1984-12-16
FR2548067B1 (en) 1988-01-15
GB8503548D0 (en) 1985-03-13
JPS60501548A (en) 1985-09-19
NO850569L (en) 1985-02-14
DE3490272T1 (en) 1985-07-25
SE8500692L (en) 1985-02-14
DK274283D0 (en) 1983-06-15
SE8500692D0 (en) 1985-02-14
GB2156607A (en) 1985-10-09
DE3490272C2 (en) 1990-11-22
FR2548067A1 (en) 1985-01-04

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