US3818176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse welding processes
Assignee: Welding Institute England
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Filing: 1972-08-18
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Granted: 1974-06-18
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Expires: 1992-08-18
Abstract
Abstract A metal arc welding process is described in which the arc is cyclically oscillated across and/or along the weld jointline during a weld, and in which the phase of the cyclic oscillations is correlated with the phase of a periodic metal transfer from the electrode to the workpiece such that each transference of metal takes place at a preselected instant during the cyclic movement of the arc.
Inventors
- 👤 K Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:01
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/24; B23K9/28; B23K9/30; B23K9/09; B23K9/091
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
Apparatus for a metal arc welding process including a welding electrode, means for relatively moving the welding electrode and a workpiece along a weld joint line, means for establishing an arc between the electrode and the workpiece, means for cyclically oscillating the arc in a direction parallel to the workpiece during said relative movement, means for effecting a periodic metal transfer from said electrode to said workpiece, and means for correlating the cyclic movement of the arc with said periodic metal transfer such that a predetermined number of transferances occur during each oscillation of the arc and each transferance occurs at at least one predetermined instant during each oscillation.
Claim 2
Dependent Claim
109 words
Apparatus for a metal arc welding process including a welding electrode, means for relatively moving the welding electrode and a workpiece along a weld joint line, means for establishing an arc between the electrode and the workpiece, means for cyclically oscillating the arc in a direction parallel to the workpiece during said relative movement, means for effecting a periodic metal transfer from said electrode to said workpiece, and means for correlating the cyclic movement of the arc with said periodic metal transfer such that a predetermined number of transferances occur during each oscillation of the arc and each transferance occurs at at least one predetermined instant during each oscillation.
Claim 3
Dependent Claim
21 words
Apparatus as defined by claim 1 in which the cyclic oscillations of the arc are produced by oscillating the welding electrode.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 1 in which the metal transfer effecting means comprises means for pulsing the arc current, each pulse being of sufficient magnitude to detach a drop of fused metal from the welding electrode.
Claim 5
Dependent Claim
40 words
Apparatus according to claim 2 further including a transducer for obtaining an electrical signal representing the displacement of the electrode, and a phase control unit responsive to the output of the transducer for controlling the phase of the welding pulses.
Claim 6
Dependent Claim
45 words
Apparatus according to claim 4 further including an array of transducers positioned to detect the heat penetration on each side of the weld jointline and means responsive to the output of the transducers for controlling the power delivered to the arc during each oscillation cycle.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 2 further including means for synchronising the electrode oscillations and the phase of the welding pulses in each oscillation cycle with a mains supply frequency.
Claim 8
Dependent Claim
22 words
Apparatus according to claim 2 further including means for axially oscillating the electrode along its longitudinal axis during its other oscillatory motion.
Claim 9
Dependent Claim
45 words
Apparatus according to claim 1 in which the metal transfer effecting means comprises means for axially oscillating the electrode toward and away from the workpiece such that metal is transferred from the electrode to the workpiece each time the electrode reaches its lowest axial position.
References Cited (Backward Citations)
US3328556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |