US3780259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonconsumable tungsten electrode for arc welding
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1971-10-06
•
Granted: 1973-12-18
•
Expires: 1991-10-06
Abstract
Abstract A nonconsumable tungsten or tungsten alloy electrode for arc welding having a cylindrical body ending in a planar end surface characterized by a cavity on the center line of the end surface to produce an annular flat surface at the electrode tip. The cavity is preferably a cylindrical cavity having a diameter in the range of 25 to 50 per cent of the diameter of the electrode and the cavity may terminate in a flat bottom or a conical portion. The tip configuration formed by the cavity improves the dimensional stability of the tip so that the arc formed during welding is concentrated and stabilized at the centerline of the electrode.
Inventors
- 👤 R Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:33
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0205
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
A nonconsumable electrode limited for use in an arc welding system having an electrode supplied with power to form a welding arc, said electrode consisting of tungsten and tungsten alloy and having a cylindrical body portion terminating in a tip, the improvement comprising the tip having a planar surface extending transverse to the centerline of the electrode and having means for improving the dimensional stability of the tip of the electrode and for concentrating and stabilizing the arc formed during welding at the centerline of the electrode, said means comprising a cavity on the centerline of the electrode extending into the body portion to a limited depth to provide an annular end surface for the tip, said cavity having a cylindrical cavity portion adjacent the planar surface which portion is concentric with the centerline of the electrode and terminates in a flat bottom wall, said cylindrical portion having a diameter in the range between 25 and 50 percent of the diameter of the electrode and the depth of the cavity being at least 25 percent of the diameter of the electrode and less than twice the diameter of the electrode.
Claim 2
Dependent Claim
190 words
A nonconsumable electrode limited for use in an arc welding system having an electrode supplied with power to form a welding arc, said electrode consisting of tungsten and tungsten alloy and having a cylindrical body portion terminating in a tip, the improvement comprising the tip having a planar surface extending transverse to the centerline of the electrode and having means for improving the dimensional stability of the tip of the electrode and for concentrating and stabilizing the arc formed during welding at the centerline of the electrode, said means comprising a cavity on the centerline of the electrode extending into the body portion to a limited depth to provide an annular end surface for the tip, said cavity having a cylindrical cavity portion adjacent the planar surface which portion is concentric with the centerline of the electrode and terminates in a flat bottom wall, said cylindrical portion having a diameter in the range between 25 and 50 percent of the diameter of the electrode and the depth of the cavity being at least 25 percent of the diameter of the electrode and less than twice the diameter of the electrode.
Claim 3
Dependent Claim
214 words
A nonconsumable electrode limited for use in an arc welding system having an electrode supplied with power to form a welding arc, said electrode consisting of tungsten and tungsten alloy and having a cylindrical body portion terminating in a tip, the improvement comprising the tip having a planar surface extending transverse to the centerline of the electrode and having means for improving the dimensional stability of the tip of the electrode and for concentrating And stabilizing the arc formed during welding at the centerline of the electrode, said means comprising a cavity on the centerline of the electrode extending into the body portion to a limited depth to provide an annular end surface for the tip, said cavity having a cylindrical cavity portion adjacent to the planar surface which portion is concentric with the centerline of the electrode and terminates in a conical cavity portion having an apex angle in a range of between 45* and 120*, said cylindrical portion having a diameter in the range between 25 and 50 percent of the diameter of the electrode and the depth of the cylindrical portion of the cavity being at least 25 percent of the diameter of the electrode and the overall depth of the cavity being less than twice the diameter of the electrode.
Claim 4
Dependent Claim
214 words
A nonconsumable electrode limited for use in an arc welding system having an electrode supplied with power to form a welding arc, said electrode consisting of tungsten and tungsten alloy and having a cylindrical body portion terminating in a tip, the improvement comprising the tip having a planar surface extending transverse to the centerline of the electrode and having means for improving the dimensional stability of the tip of the electrode and for concentrating And stabilizing the arc formed during welding at the centerline of the electrode, said means comprising a cavity on the centerline of the electrode extending into the body portion to a limited depth to provide an annular end surface for the tip, said cavity having a cylindrical cavity portion adjacent to the planar surface which portion is concentric with the centerline of the electrode and terminates in a conical cavity portion having an apex angle in a range of between 45* and 120*, said cylindrical portion having a diameter in the range between 25 and 50 percent of the diameter of the electrode and the depth of the cylindrical portion of the cavity being at least 25 percent of the diameter of the electrode and the overall depth of the cavity being less than twice the diameter of the electrode.
References Cited (Backward Citations)
US1993811A
Cited
US1949276A
Cited
US2379187A
Cited
US2744945A
Cited
US3076085A
Cited
US3471675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |