US3876855A - Tungsten inert gas arc striking device - Google Patents

Tungsten inert gas arc striking device Download PDF

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Publication number
US3876855A
US3876855A US332311A US33231173A US3876855A US 3876855 A US3876855 A US 3876855A US 332311 A US332311 A US 332311A US 33231173 A US33231173 A US 33231173A US 3876855 A US3876855 A US 3876855A
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US
United States
Prior art keywords
voltage
welding
arc
discharge switch
electrodes
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
Application number
US332311A
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English (en)
Inventor
Kazushige Hirasawa
Takeshi Oku
Yoshimitsu Matsumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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
Priority claimed from JP1759172A external-priority patent/JPS4885456A/ja
Priority claimed from JP1758672A external-priority patent/JPS4885451A/ja
Priority claimed from JP1758972A external-priority patent/JPS4885454A/ja
Priority claimed from JP1758572A external-priority patent/JPS4885450A/ja
Priority claimed from JP1758772A external-priority patent/JPS4885452A/ja
Priority claimed from JP1759272A external-priority patent/JPS5237573B2/ja
Priority claimed from JP1759072A external-priority patent/JPS4885455A/ja
Priority claimed from JP1758872A external-priority patent/JPS4885453A/ja
Priority claimed from JP11248972A external-priority patent/JPS4970846A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3876855A publication Critical patent/US3876855A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/55—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a gas-filled tube having a control electrode
    • 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
    • B23K9/0672—Starting the arc without direct contact between electrodes
    • B23K9/0673—Ionisation of the arc gap by means of a tension with a step front (pulses or high frequency tensions)
    • 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
    • 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
    • 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
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1012—Power supply characterised by parts of the process
    • B23K9/1025—Means for suppressing or reducing DC components in AC arc welding installations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/537—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a spark gap

Definitions

  • ABSTRACT A tungsten inert gas are striking device for welding stainless steels and nonferrous metals, e.g., aluminum is provided, in which when striking an are or restriking the arc, the charge stored in a capacitor is momentarily discharged through a discharge switch and a c0upling coil to produce a kick voltage and this kick voltage is then superimposed on a welding current to effect the are striking 0r restriking.
  • welds of high quality can be produced and the occurrence of radio interferences can also be eliminated.
  • FIG. 30 PRIOR ART 6 PIRTENTEBAPR 819. 5
  • the present invention relates to improvements in or relating to tungsten inert gas arc striking devices. More particularly, the present invention relates to a tungsten inert gas are striking device of the type in which when striking or restriking the arc, a discharge switch having first and second electrodes disposed opposite to each other and a discharge starting electrode located near the first and second electrodes is used, and a trigger pulse voltage is applied across either one of the first and second electrodes and the discharge starting electrode to thereby momentarily discharge the charge stored in a capacitor across the first and second electrodes of the discharge switch and through a coil, whereby a kick voltage induced in the coil is superimposed on a welding current circuit to effect the striking or restriking of the arc.
  • the tungsten inert gas arc welding process (TIG arc welding process) is extensively used for welding stainless steels and nonferrous metals such as aluminum.
  • TIG arc welding process an arc is struck or restruck between a base metal and an electrode with no contact therebetween and therefore a high-voltage high-frequency is employed.
  • the high frequency generator for producing such a high-voltage high-frequency is of a so-called spark oscillation type and one form of this type of high frequency generator is shown in FIG. 1.
  • numeral 1 designates power supply terminals, 2 a welding power supply terminal, 3 a welding torch terminal.
  • Symbol H designates a high frequency generating portion, T a high frequency transformer, G and G spark gaps'consisting of tungsten electrodes, C an oscillating capacitor, L an oscillating coil, C.C a coupling coil for superimposing a high frequency on a welding current circuit, F a noise suppressing filter.
  • This type of high frequency generator is strong and is thus used extensively, but has the following disadvantages.
  • the generated high frequency includes frequency components ranging over a wide band with the center frequency being in the range 1-3 MHz and consequently, even if the filter is provided between the power source and the device, there occurs the propagation of noise to the power supply line and this noise further results in radiant waves, causing considerable interference in radio equipments, e.g., radio and television receivers and in radio communications as well.
  • the noise field density due to the device of the present invention is lower by 45 decibels than that due to the known spark oscillation type device and it is about the same as the ambient noise.
  • the welding arc starting characteristic of the arc striking device according to the present invention is excellent as compared with that of the known spark oscillation type device.
  • FIG. 1 is an electric circuit diagram of a tungsten inert gas are striking device (TIG arc device) of the type known in the art;
  • FIG. 2 is an electric circuit diagram of a TIG arc device according to the present invention.
  • FIG. 3a is a diagram showing the welding current waveform when striking or restriking the arc in the prior art TIG arc device of FIG. 1;
  • FIG. 3b is a diagram showing the welding current waveform when striking or restriking the arc in the TIG arc device according to the present invention
  • FIG. 4 is a waveform diagram of the rise portion of the welding voltage in the TIG arc device according to the present invention.
  • FIGS. 50 and 5b show welding arc voltage waveforms in the TIG arc device according to the present invention
  • FIG. 6 is a block diagram of the pulse signal generating circuit employed in the TIG arc device of the present invention.
  • FIG. 7 shows the welding power supply voltage waveform and the trigger pulse voltage waveform for gener ating a kick voltage in the device of the present invention
  • FIG. 8 shows the welding power supply voltage waveform and the pulse waveform in the device of the present invention
  • FIG. 9 shows the welding current waveform in the prior art device
  • FIGS. 10 to 12 are electric circuit diagrams of other different embodiments of the tungsten inert gas arc striking device according to the present invention.
  • FIG. 13 is a graph showing the noise field intensity characteristic curves of the prior art device and the device of the present invention, respectively.
  • numeral 2 designates a welding power supply terminal, 3 a welding torch terminal.
  • Symbol C designates a capacitor, E, a DC power source for charging the capacitor C to a high voltage, SW a discharge switch according to the present invention.
  • the discharge switch SW consists of a discharge starting electrode P for operating the discharge switch SW, a first electrode 4 and a second electrode 5, and these electrodes are made of metal, e.g., tungsten. If necessary, an inert gas, e.g., an argon gas is continuously supplied into the discharge switch SW.
  • a pulse-type trigger voltage indicated at Pu When a pulse-type trigger voltage indicated at Pu is applied across the discharge starting electrode P and the second electrode 5, a pulse discharge is momentarily caused across the discharge starting electrode P and the second electrode 5 and consequently the gap formed between the first and second electrodes 4 and 5 is conditioned to readily start a discharge.
  • Symbol CC designates a coupling coil for superimposing a kick voltage induced in a coil L on the welding current circuit. The operation of this circuit will now be explained with reference to FIG. 2. If, when striking or restriking the arc, a pulse-type trigger voltage is applied across the discharge starting electrode P and the second electrode 5 in the discharge switch SW, this creates a condition in the gap between the first and second electrodes 4 and 5 which tends to readily start a discharge.
  • numeral 6 designates the welding current waveform
  • 7 the welding arc striking time
  • 8 the welding arc restriking time
  • Numeral 9 designates the high frequency which is generated at the welding arc striking time 7 and the restriking times 8
  • numeral 10 designates the high-tension kick voltage generated at the welding arc striking time 7 and the restriking times 8.
  • the high frequency 9 is substantially generated continuously
  • the kick voltage 10 is generated only momentarily at the welding arc striking time 7 and the restriking time 8. This results ina considerable decrease in the noise field intensity.
  • the phase at which the kick voltage will be generated is very important and has an important bearing on the stability of the welding arc.
  • a welding arc which ensures welds of high quality can be continuously provided only if the kick voltage is generated across the torch electrode and the base metal to be welded at a properly selected phase when striking or restriking the welding arc.
  • Different methods have been conceived for generating a kick voltage at a suitable phase. FIGS. 4, 6, 7 and 8 illustrate such methods of operation.
  • FIG. 4 relates to a method in which the kick voltage is generated in synchronism with the rise portion of the welding voltage waveform.
  • the voltage across the terminals of the welding machine rises as shown by the waveform designated by the numeral 11 after the welding current flow is reduced to zero.
  • Numeral 12 designates the phase at which a trigger pulse voltage Pue is generated at a voltage value e of the rise portion of the welding voltage waveform.
  • 13 designates the phase at which a trigger pulse voltage Pue is generated at a voltage value 2 of the rise portion of the welding voltage waveform.
  • the trigger pulse voltage Pue is generated and applied to the discharge starting electrode P in the discharge switch SW shown in FIG.
  • F IG. 5 illustrates the welding arc voltage waveforms resulting from the kick voltages generated by the method of FIG. 4.
  • FIG. 5a shows the voltage waveform of the welding are obtained when the discharge switch SW was actuated by the trigger pulse voltage Pue in FIG. 4
  • FIG. 5b shows the voltage waveform of the welding are obtained when the discharge switch SW was actuated by the trigger pulse voltage Pue in FIG. 4.
  • FIG. 6 illustrates in block diagram form another method in which the voltage waveform across the terminals of the welding machine subjected to full-wave rectification is compared with a DC reference voltage so that the kick voltage is generated at that phase near which the rectified voltage waveform across the terminals of the welding machine and the DC reference voltage join.
  • numeral 14 designates an AC welding arc voltage waveform
  • 15 a rectifier circuit in which the voltage waveform across the terminals of the welding machine is subjected to full-wave rectification
  • 16 a DC reference voltage
  • 17 a comparison circuit for comparing the rectified voltage waveform across the terminals of the welding machine with the DC reference voltage
  • 18 a pulse generating circuit.
  • the operation of the arrangement shown in FIG. 6 is as follows:
  • the are voltage waveform 14 across the terminals of the welding machine, is subjected to full-wave rectification through the rectifier circuit 15 and the resultant rectified voltage waveform across the terminals of the welding machine is compared with the DC reference voltage 16 in the comparator circuit 17.
  • the pulse generating circuit 18 is operated at that phase near which the voltage waveform across the terminals of the welding machine and the DC reference voltage join, producing a trigger pulse voltage 19 which is applied to the discharge starting electrode P of the discharge switch SW in FIG. 2. Consequently, the discharge switch SW is operated thereby inducing a kick voltage.
  • FIG. 7 illustrates another method for generating the kick voltage in synchronization with the welding power supply frequency.
  • numeral 20 designates a welding power supply input voltage waveform
  • numeral 22 designates a trigger pulse voltage synchronized with the welding power supply frequency and generated at a point 21 which is in advance of the welding power supply input voltage phase by a time T.
  • the pulse 22 synchronized with the welding power supply frequency and generated at the point 21 which is in advance, by time T, of the welding voltage supply input voltage phase, is applied to the discharge starting electrode P of the discharge switch SW in FIG. 2, whereby the discharge switch SW is operated to thereby induce the kick voltage.
  • FIG. 8 illustrates a still further method in which the phase at which the kick voltage will be generated, is selected so that both the positive and negative half cycles of the welding current have practically the same effective current value.
  • numeral 23 designates a welding current waveform containing a DC component, 24 negative half cycles of the welding current, 25 positive half cycles of the welding current having the same effective value as that of the negative half cycles 24.
  • Numeral 26 designates a trigger pulse voltage generated at that phasewhich is so selected that both the positive and negative half cycles of the welding current have practically the same effective value.
  • the trigger pulse voltage 26 generated at the phase selected to provide practically the same effective value for both the positive and negative half cycles of the welding current is applied to the discharge starting electrode P of the discharge switch SW in FIG. 2 so that the discharge switch SW is operated thus inducing the kick voltage.
  • an arc is struck or restruck, thereby providing a welding current waveform containing no DC component as indicated by numeral 27 in FIG. 8.
  • the welding current waveform 27 in FIG. 8 there are times when the welding arc is not produced, but the welding arc is extremely stable, is capable of performing high quality welding on aluminum, for example, and eliminates any adverse effect on the welding power supply.
  • symbol SW designates a switching element for changing the voltage on the capacitor C
  • Ca designates a capacitor for generating the trigger pulse voltage Pu across the second electrode 5 and the'discharge starting electrode P in the discharge switch SW, E a power supply for charging the capacitor C
  • a switching element SW is an element whose internal impedance decreases considerably upon application of an electric pulse thereto and it may consist of a thyristor or the like.
  • Symbol SW designates a switching element for changing the capacity of the capacitor C
  • the switching element SW When striking a welding arc, the switching element SW is connected to a high voltage terminal 28, that is, the capacitor C is charged to a high voltage and the contacts of the switching element SW are opened, i.e., the total capacitance of the capacitor C is reduced. In other words, the power value of the trigger pulse voltage Pu is reduced to thereby operate the discharge switch SW.
  • the switching element SW is connected to a low voltage terminal 29, i.e., the capacitor C, is charged to a low voltage and the contacts of the switching element SW are closed, i.e., the capacitor of the capacitor C is increased.
  • the discharge switch Sw is operated with the trigger pulse voltage Pu having an increased power value. In this way, the kick voltage is generated to accomplish the striking and restriking of the welding arc.
  • a very stable arc can be established between the respective electrodes constituting the discharge switch SW and hence quality welds can be obtained.
  • FIG. 11 illustrates another embodiment of the present invention in which the value of the voltage on the capacitor C is varied as a means of varying the power value of trigger pulse voltage Pu. Pu.
  • FIG. 12 illustrates another embodiment of this invention in which the discharge switch SW is replaced by a gas discharge tube having two electrodes disposed in opposite positions and a trigger electrode disposed near the oppose electrodes.
  • the operating principle of this embodiment is identical with the previously described embodiments employing the discharge switch SW.
  • a thyristor as a switching device for momentarily discharging the charge on the capacitor C may be considered.
  • the current change rate, i.e., di/dt and the change rate of a voltage applied to the thyristor, i.e., dv/dt tend to assume very high values due to the fact that it is impossible to increase the impedance of the coil L owing to the welding current directly flowing into the coupling coil CC and that the charge on the capacitor C, charged to a high voltage must be discharged momentarily to provide a high kick voltage of several thousand volts when striking a welding arc.
  • Apparatus including an alternating current welding power supply for striking and restriking a tungsten inert gas arc to produce an AC welding arc voltage across a pair of welding electrodes comprising a. rectifier means for rectifying said arc voltage,
  • comparator means for comparing the rectified arc voltage with a reference voltage
  • trigger pulse generator means coupled to said comparator means for producing a trigger pulse when said rectified arc voltage corresponds to said reference voltage
  • a kick voltage generating circuit including l. a discharge switch having first and second electrodes opposing each other and a discharge starting electrode disposed adjacent said first and second electrodes,
  • phase of the kick voltage is such that the effective values of the positive half cycles and the negative half cycles of the welding current are substantially equal.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)
  • Generation Of Surge Voltage And Current (AREA)
US332311A 1972-02-18 1973-02-14 Tungsten inert gas arc striking device Expired - Lifetime US3876855A (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP1758572A JPS4885450A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1758772A JPS4885452A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1759272A JPS5237573B2 (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1759172A JPS4885456A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1758972A JPS4885454A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1759072A JPS4885455A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1758872A JPS4885453A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP1758672A JPS4885451A (enrdf_load_stackoverflow) 1972-02-18 1972-02-18
JP11248972A JPS4970846A (enrdf_load_stackoverflow) 1972-11-08 1972-11-08

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US (1) US3876855A (enrdf_load_stackoverflow)
CA (1) CA979076A (enrdf_load_stackoverflow)
DE (1) DE2307753C2 (enrdf_load_stackoverflow)
FR (1) FR2172385B1 (enrdf_load_stackoverflow)
GB (1) GB1404374A (enrdf_load_stackoverflow)
NL (1) NL163733C (enrdf_load_stackoverflow)

Cited By (15)

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Publication number Priority date Publication date Assignee Title
US4225769A (en) * 1977-09-26 1980-09-30 Thermal Dynamics Corporation Plasma torch starting circuit
US4378513A (en) * 1980-06-12 1983-03-29 Matsushita Electric Industrial Co., Ltd. High pressure discharge lamp apparatus
US4385261A (en) * 1979-08-02 1983-05-24 Bbc Brown, Boveri & Company, Limited Method and apparatus for the execution of gas discharge reactions
US4501947A (en) * 1983-12-15 1985-02-26 Kerlin Jack H Electric arc unbalance correction system
US4678888A (en) * 1983-01-21 1987-07-07 Plasma Energy Corporation Power circuit apparatus for starting and operating plasma arc
US4682084A (en) * 1985-08-28 1987-07-21 Innovative Controls, Incorporated High intensity discharge lamp self-adjusting ballast system sensitive to the radiant energy or heat of the lamp
US4686428A (en) * 1985-08-28 1987-08-11 Innovative Controls, Incorporated High intensity discharge lamp self-adjusting ballast system with current limiters and a current feedback loop
US4767912A (en) * 1986-08-25 1988-08-30 Esab Welding Products, Inc. High frequency arc stabilizer
US4999547A (en) * 1986-09-25 1991-03-12 Innovative Controls, Incorporated Ballast for high pressure sodium lamps having constant line and lamp wattage
US5117088A (en) * 1991-03-13 1992-05-26 The Lincoln Electric Company Device and method for starting electric arc of a welder
US5159174A (en) * 1990-11-01 1992-10-27 Westinghouse Electric Corp. Nonconsumable electrode for stainless steel welding and method of welding
US20080264915A1 (en) * 2007-04-30 2008-10-30 Illinois Tool Works Inc. Welding power source with automatic variable high frequency
CN103331505A (zh) * 2013-07-12 2013-10-02 宣浩 一种电火花堆焊电路
CN103817399A (zh) * 2014-02-20 2014-05-28 河南科技大学 多脉冲数字控制型电火花沉积堆焊电源
CN111344097A (zh) * 2017-11-08 2020-06-26 弗罗纽斯国际有限公司 电弧的无接触点火方法和用于执行点火工艺的焊接电流源

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CN102179596B (zh) * 2011-05-13 2015-05-13 杭州恒湖科技有限公司 一种氩弧焊引弧电路

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US2235385A (en) * 1939-03-23 1941-03-18 Rava Alexander Welding method and apparatus
US2399415A (en) * 1943-05-08 1946-04-30 Westinghouse Electric Corp Arc welding system
US2659036A (en) * 1950-08-11 1953-11-10 Era Patents Ltd Alternating current arc welding equipment
US3154719A (en) * 1961-09-11 1964-10-27 Welding Research Inc Arc starting system
US3328637A (en) * 1965-02-11 1967-06-27 Harnischfeger Corp Alternating current arc power source
US3444431A (en) * 1965-10-23 1969-05-13 Eg & G Inc Electric flash beacon
US3474258A (en) * 1967-03-03 1969-10-21 Weston Instruments Inc Solid state relays
US3551741A (en) * 1967-07-04 1970-12-29 Linde Ag Arc striking or stabilization network having a detecting transformer and capacitor connected to the electrode
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US3637974A (en) * 1969-06-06 1972-01-25 Linde Ag Switching arrangement for the stabilization and ignition of welding arcs and the like
US3780258A (en) * 1971-06-17 1973-12-18 Air Prod & Chem Alternating current arc power source having opposite polarity ignition pulse

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FR1088586A (fr) * 1953-07-30 1955-03-08 Soudure Autogene Francaise Dispositif pour l'amorçage et la stabilisation d'un arc de soudage
DE1002097B (de) * 1956-02-25 1957-02-07 Linde Eismasch Ag Vorrichtung zum Stabilisieren eines Wechselstrom-Schweisslichtbogens beim Strom-Nulldurchgang mittels eines Impulstransformators
DE1011095B (de) * 1956-03-22 1957-06-27 Siemens Ag Hochfrequenz-Zuendgeraet fuer Wechselstrom-Lichtboegen, insbesondere zum Schweissen mit einer Funkenstrecke
DE1615363C3 (de) * 1967-07-04 1974-11-07 Messer Griesheim Gmbh, 6000 Frankfurt Einrichtung zum Stabilisieren und Zünden von Schweißlichtbögen durch Stromimpulse
GB1241959A (en) * 1967-12-19 1971-08-11 British Oxygen Co Ltd Electric arc welding

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US2235385A (en) * 1939-03-23 1941-03-18 Rava Alexander Welding method and apparatus
US2399415A (en) * 1943-05-08 1946-04-30 Westinghouse Electric Corp Arc welding system
US2659036A (en) * 1950-08-11 1953-11-10 Era Patents Ltd Alternating current arc welding equipment
US3154719A (en) * 1961-09-11 1964-10-27 Welding Research Inc Arc starting system
US3328637A (en) * 1965-02-11 1967-06-27 Harnischfeger Corp Alternating current arc power source
US3444431A (en) * 1965-10-23 1969-05-13 Eg & G Inc Electric flash beacon
US3474258A (en) * 1967-03-03 1969-10-21 Weston Instruments Inc Solid state relays
US3551741A (en) * 1967-07-04 1970-12-29 Linde Ag Arc striking or stabilization network having a detecting transformer and capacitor connected to the electrode
US3588465A (en) * 1968-10-29 1971-06-28 Air Reduction Line voltage compensating pulsed power welding supply
US3637974A (en) * 1969-06-06 1972-01-25 Linde Ag Switching arrangement for the stabilization and ignition of welding arcs and the like
US3780258A (en) * 1971-06-17 1973-12-18 Air Prod & Chem Alternating current arc power source having opposite polarity ignition pulse

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225769A (en) * 1977-09-26 1980-09-30 Thermal Dynamics Corporation Plasma torch starting circuit
US4385261A (en) * 1979-08-02 1983-05-24 Bbc Brown, Boveri & Company, Limited Method and apparatus for the execution of gas discharge reactions
US4378513A (en) * 1980-06-12 1983-03-29 Matsushita Electric Industrial Co., Ltd. High pressure discharge lamp apparatus
US4678888A (en) * 1983-01-21 1987-07-07 Plasma Energy Corporation Power circuit apparatus for starting and operating plasma arc
US4501947A (en) * 1983-12-15 1985-02-26 Kerlin Jack H Electric arc unbalance correction system
US4682084A (en) * 1985-08-28 1987-07-21 Innovative Controls, Incorporated High intensity discharge lamp self-adjusting ballast system sensitive to the radiant energy or heat of the lamp
US4686428A (en) * 1985-08-28 1987-08-11 Innovative Controls, Incorporated High intensity discharge lamp self-adjusting ballast system with current limiters and a current feedback loop
US4767912A (en) * 1986-08-25 1988-08-30 Esab Welding Products, Inc. High frequency arc stabilizer
EP0257795A3 (en) * 1986-08-25 1989-06-07 Esab Welding Products, Inc. High frequency arc stabilizer
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Also Published As

Publication number Publication date
NL163733C (nl) 1980-10-15
GB1404374A (en) 1975-08-28
CA979076A (en) 1975-12-02
NL7302181A (enrdf_load_stackoverflow) 1973-08-21
NL163733B (nl) 1980-05-16
FR2172385B1 (enrdf_load_stackoverflow) 1977-08-19
DE2307753C2 (de) 1981-12-10
FR2172385A1 (enrdf_load_stackoverflow) 1973-09-28
DE2307753A1 (de) 1973-08-23

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