US3581053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchro-arc metal transfer
Assignee: L-Tec Co
•
Filing: 1967-12-05
•
Granted: 1971-05-25
•
Expires: 1987-12-05
Abstract
Abstract Electric arc working apparatus and process for controllably transferring metal from a consumable electrode to a workpiece by applying recurrent power pulses to said electrode while oscillating said electrode at a multiple frequency relative to the power pulse recurrence frequency, and selectively displacing the phase between said power pulses and said electrode oscillations.
Inventors
- 👤 August F Manz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/09; B23K9/091
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A process for electric arc working wherein an arc is established between a consumable electrode and a workpiece comprising the steps of: advancing the tip of said consumable electrode while oscillating said electrode in a substantially perpendicular plane with respect to said workpiece such that the arc length is repetitively varied between a minimum and maximum amplitude; simultaneously supplying power to said electrode in the form of recurrent power pulses at an integer multiple frequency with respect to said electrode oscillations; and selectively displacing the phase between said recurrent power pulses and said electrode oscillations whereby the instantaneous power provided by the recurrent power pulses at the instant of minimum arc length is determined by the amount of said phase displacement.
Claim 2
Dependent Claim
121 words
A process for electric arc working wherein an arc is established between a consumable electrode and a workpiece comprising the steps of: advancing the tip of said consumable electrode while oscillating said electrode in a substantially perpendicular plane with respect to said workpiece such that the arc length is repetitively varied between a minimum and maximum amplitude; simultaneously supplying power to said electrode in the form of recurrent power pulses at an integer multiple frequency with respect to said electrode oscillations; and selectively displacing the phase between said recurrent power pulses and said electrode oscillations whereby the instantaneous power provided by the recurrent power pulses at the instant of minimum arc length is determined by the amount of said phase displacement.
Claim 3
Dependent Claim
18 words
A process as defined in claim 1 wherein the amplitude of said recurrent power pulses is selectively adjustable.
Claim 4
Dependent Claim
16 words
A process as defined in claim 1 wherein the amplitude of electrode oscillation is selectively adjustable.
Claim 5
Dependent Claim
113 words
A process for electric arc working comprising: supplying recurrent pulses of current having a minimum and maximum amplitude through a consumable electrode being advanced toward a workpiece; raising said electrode to a height above said workpiece to permit molten metal to be formed at the end of the electrode; lowering said electrode into direct contact with said workpiece for depositing said molten metal upon said workpiece, and selectively displacing the phase between the recurrent arc pulses of current and the raising and lowering of said electrode whereby the instantaneous amplitude of said arc pulses of current at the instant the electrode contacts said workpiece is determined by the amount of said phase displacement.
Claim 6
Dependent Claim
113 words
A process for electric arc working comprising: supplying recurrent pulses of current having a minimum and maximum amplitude through a consumable electrode being advanced toward a workpiece; raising said electrode to a height above said workpiece to permit molten metal to be formed at the end of the electrode; lowering said electrode into direct contact with said workpiece for depositing said molten metal upon said workpiece, and selectively displacing the phase between the recurrent arc pulses of current and the raising and lowering of said electrode whereby the instantaneous amplitude of said arc pulses of current at the instant the electrode contacts said workpiece is determined by the amount of said phase displacement.
Claim 7
Independent Claim
116 words
A method of electric arc working wherein metal is transferred during short circuits between a consumable electrode and a workpiece which comprises: feeding said electrode toward said workpiece while simultaneously oscillating said electrode in a substantially perpendicular plane with respect to the workpiece to cause intermittent short circuits between the electrode and workpiece at a predetermined short circuit frequency; supplying recurrent pulses of current, having a minimum and maximum amplitude, to said electrode at an integer multiple frequency with respect to said short circuit frequency; and establishing a phase displacement between the recurrent pulses of current and the oscillating electrode such that the electrode breaks contact with the workpiece at substantially the instant of minimum-amplitude current.
Claim 8
Independent Claim
116 words
A method of electric arc working wherein metal is transferred during short circuits between a consumable electrode and a workpiece which comprises: feeding said electrode toward said workpiece while simultaneously oscillating said electrode in a substantially perpendicular plane with respect to the workpiece to cause intermittent short circuits between the electrode and workpiece at a predetermined short circuit frequency; supplying recurrent pulses of current, having a minimum and maximum amplitude, to said electrode at an integer multiple frequency with respect to said short circuit frequency; and establishing a phase displacement between the recurrent pulses of current and the oscillating electrode such that the electrode breaks contact with the workpiece at substantially the instant of minimum-amplitude current.
Claim 9
Dependent Claim
114 words
An arc-welding system comprising in combination with a welding circuit including means for feeding a consumable electrode toward a workpiece; means for oscillating said electrode at a given frequency in a substantially perpendicular plane with respect to said workpiece such that the arc length is repetitively varied between a minimum and maximum amplitude; power supply means electrically connected in said welding circuit for supplying to said electrode periodic pulses of current at an integer multiple frequency with respect to said electrode oscillating frequency; and phase shift means for selectivEly displacing the phase between said pulses of current and said oscillating electrode thereby to establish any desired intersection of instantaneous current amplitude and arc length.
Claim 10
Dependent Claim
114 words
An arc-welding system comprising in combination with a welding circuit including means for feeding a consumable electrode toward a workpiece; means for oscillating said electrode at a given frequency in a substantially perpendicular plane with respect to said workpiece such that the arc length is repetitively varied between a minimum and maximum amplitude; power supply means electrically connected in said welding circuit for supplying to said electrode periodic pulses of current at an integer multiple frequency with respect to said electrode oscillating frequency; and phase shift means for selectivEly displacing the phase between said pulses of current and said oscillating electrode thereby to establish any desired intersection of instantaneous current amplitude and arc length.
Claim 11
Dependent Claim
46 words
Arc welding apparatus as defined in claim 6 wherein said power supply includes means for selectively adjusting the magnitude of said pulses of direct current and means for introducing into said welding circuit a predetermined amount of direct current in addition to said pulses of current.
References Cited (Backward Citations)
US1984809A
Cited
US3053975A
Cited
US3350538A
Cited
US3361892A
Cited
US3365564A
Cited
US3277266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |