Patent US3683149A successfully refreshed from Google Patents.
US3683149A
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US
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Method for arc welding using individual pulse control for material detachment and acceleration
Assignee: Elektrodenfabrik Oerlikon Buehrle AG
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Filing: 1970-06-26
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Granted: 1972-08-08
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Expires: 1990-06-26
Abstract
Abstract A method of arc welding wherein the welding current delivered to the welding electrode is periodically caused to assume a plurality of essentially different amplitude values such that a waveform having at least a main and auxiliary amplitude is provided to the electrode. The main amplitude is provided to fuse and detach material from the end of the electrode while the auxiliary amplitude is used to accelerate the detached material to the weld puddle.
Inventors
- 👤 Karl Mages
- 👤 Hans Ulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:00
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/09; B23K9/091; B23K9/092
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
183 words
A method of arc welding including the steps of providing a single multi-phase signal, asymmetrically amplifying individual phases of said multi-phase signal, rectifying the individual amplified phases so as to produce an output waveform having a series of greater and lesser amplitudes, applying said output waveform to a work gap formed betWeen a welding electrode and workpiece, and producing a controlled drop transfer of material from the electrode to the workpiece by means of said output waveform, wherein said output waveform includes a main amplitude followed by an auxiliary amplitude of lower amplitude than the main amplitude, the main amplitude being sufficiently great to fuse welding material at a free tip of the electrode situated opposite the workpiece and to cause the fused welding material to become detached from said tip in the form of a controlled drop transfer, and said auxiliary amplitude being of sufficient amplitude and occurring at such time subsequent to the main amplitude to promote free flight acceleration through the work gap between the electrode and workpiece of the welding material fused while the immediately preceeding main amplitude occured.
Claim 2
Independent Claim
183 words
A method of arc welding including the steps of providing a single multi-phase signal, asymmetrically amplifying individual phases of said multi-phase signal, rectifying the individual amplified phases so as to produce an output waveform having a series of greater and lesser amplitudes, applying said output waveform to a work gap formed betWeen a welding electrode and workpiece, and producing a controlled drop transfer of material from the electrode to the workpiece by means of said output waveform, wherein said output waveform includes a main amplitude followed by an auxiliary amplitude of lower amplitude than the main amplitude, the main amplitude being sufficiently great to fuse welding material at a free tip of the electrode situated opposite the workpiece and to cause the fused welding material to become detached from said tip in the form of a controlled drop transfer, and said auxiliary amplitude being of sufficient amplitude and occurring at such time subsequent to the main amplitude to promote free flight acceleration through the work gap between the electrode and workpiece of the welding material fused while the immediately preceeding main amplitude occured.
Claim 3
Dependent Claim
160 words
In a method of arc welding in an essentially inert protective atmosphere with a consumable electrode spaced from a workpiece to provide therebetween a work gap for arc welding, which method includes the steps of providing a cyclic welding current, the improvement which comprises the steps of: constraining each cycle of the cyclic welding current to comprise current values having a main amplitude followed by as auxiliary amplitude, said main amplitude being in excess of said auxiliary amplitude, and employing said main amplitude to fuse welding material at a free tip of the electrode situated opposite the workpiece and to detach the fused welding material from the tip of such electrode, and employing the auxiliary amplitude for accelerating the fused welding material during its flight through the work gap between the electrode and workpiece, said auxiliary amplitude occurring at such time subsequent to the main amplitude to accelerate the welding material fused while the immediately preceeding preceeding main amplitude occurred.
Claim 4
Dependent Claim
160 words
In a method of arc welding in an essentially inert protective atmosphere with a consumable electrode spaced from a workpiece to provide therebetween a work gap for arc welding, which method includes the steps of providing a cyclic welding current, the improvement which comprises the steps of: constraining each cycle of the cyclic welding current to comprise current values having a main amplitude followed by as auxiliary amplitude, said main amplitude being in excess of said auxiliary amplitude, and employing said main amplitude to fuse welding material at a free tip of the electrode situated opposite the workpiece and to detach the fused welding material from the tip of such electrode, and employing the auxiliary amplitude for accelerating the fused welding material during its flight through the work gap between the electrode and workpiece, said auxiliary amplitude occurring at such time subsequent to the main amplitude to accelerate the welding material fused while the immediately preceeding preceeding main amplitude occurred.
Claim 5
Dependent Claim
80 words
The improvement of claim 1 wherein the main amplitude is derived during a current impulse having a peak amplitude equal to the main amplitude, and further comprising the step of constraining each cycle of the welding current to include a non-zero base amplitude insufficient to cause appreciable fusion of the welding material, said base amplitude being the peak amplitude of another impulse derived immediately before the impulse including the main amplitude, said base amplitude being less than the auxiliary amplitude.
Claim 6
Dependent Claim
37 words
The improvement defined in claim 3, further including the step of controlling the base amplitude such that the magnitude thereof is insufficient to maintain a continuously burning arc at the work gap between the electrode and workpiece.
Claim 7
Dependent Claim
93 words
The improvement of claim 3 wherein the auxiliary amplitude is derived during a further current impulse having a peak amplitude equal to the auxiliary amplitude, and further comprising the step of constraining each cycle of the welding current to include another non-zero base amplitude insufficient to cause appreciable fusion of the welding material, said another base amplitude being the peak amplitude of an additional impulse derived immediately after the impulse including the main amplitude and immediately before the impulse including the auxiliary amplitude, said another base amplitude being less than the auxiliary amplitude.
Claim 8
Dependent Claim
69 words
The improvement defined in claim 5, wherein said main amplitude current value is in the range of 2.5 through 10 times the current value of the subsequent base amplitude, and wherein said auxiliary amplitude current value is in the range of 1.2 through 7 times the current value of the preceding base amplitude, said ranges being functions of the specific current loading of the individual electrode types and diameter.
Claim 9
Independent Claim
166 words
A method of welding with a welding arc established in an essentially inert protective atmosphere between an end of a consumable electrode and a workpiece defining between them a work gap, the improvement comprising the steps of: a. maintaining the welding arc with a current having a non-zero base amplitude insufficient to cause appreciable fusing of material at the electrode end; b. then fusing into a droplet at least a portion of welding material at the end of the electrode by applying a current having a main amplitude to the work gap, said droplet being substantially detached from the end of the electrode; c. then substantially extinguishing the fusing arc; d. then accelerating in the direction of a welding bath independently of welding position the substantially detached droplet formed during step b by applying an auxiliary current amplitude having an amplitude intermediate the amplitudes of the main and base amplitudes to the work gap; and e. then repeating steps a) through d) in a cyclic manner.
Claim 10
Independent Claim
166 words
A method of welding with a welding arc established in an essentially inert protective atmosphere between an end of a consumable electrode and a workpiece defining between them a work gap, the improvement comprising the steps of: a. maintaining the welding arc with a current having a non-zero base amplitude insufficient to cause appreciable fusing of material at the electrode end; b. then fusing into a droplet at least a portion of welding material at the end of the electrode by applying a current having a main amplitude to the work gap, said droplet being substantially detached from the end of the electrode; c. then substantially extinguishing the fusing arc; d. then accelerating in the direction of a welding bath independently of welding position the substantially detached droplet formed during step b by applying an auxiliary current amplitude having an amplitude intermediate the amplitudes of the main and base amplitudes to the work gap; and e. then repeating steps a) through d) in a cyclic manner.
Claim 11
Independent Claim
187 words
A method of welding with a welding arc established in an essentially inert protective atmosphere between an end of a consumable electrode and a workpiece defining between them a work gap, the improvement comprising the steps of: a. maintaining the welding arc with a current having a non-zero base amplitude insufficient to cause appreciable fusing of material at the electrode end; b. then fusing into a droplet at least a portion of welding material at the end of the electrode by applying a current having a main amplitude to the work gap, said droplet being substantially detached from the end of the electrode; c. then substantially extinguishing the fusing arc; d. then accelerating in the direction of a welding bath independently of welding position the substantially detached droplet formed during step b and melting further material from the end of the electrode without causing the material to be formed into substantially detached droplets by applying an auxiliary current amplitude having an amplitude intermediate the amplitudes of the main and base amplitudes to the work gap; and e. then repeating steps a) through d) in a cyclic manner.
Claim 12
Independent Claim
187 words
A method of welding with a welding arc established in an essentially inert protective atmosphere between an end of a consumable electrode and a workpiece defining between them a work gap, the improvement comprising the steps of: a. maintaining the welding arc with a current having a non-zero base amplitude insufficient to cause appreciable fusing of material at the electrode end; b. then fusing into a droplet at least a portion of welding material at the end of the electrode by applying a current having a main amplitude to the work gap, said droplet being substantially detached from the end of the electrode; c. then substantially extinguishing the fusing arc; d. then accelerating in the direction of a welding bath independently of welding position the substantially detached droplet formed during step b and melting further material from the end of the electrode without causing the material to be formed into substantially detached droplets by applying an auxiliary current amplitude having an amplitude intermediate the amplitudes of the main and base amplitudes to the work gap; and e. then repeating steps a) through d) in a cyclic manner.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |