US3882299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating arc pipe welding machine
Assignee: Sciaky Brothers Inc
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Filing: 1974-04-12
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Granted: 1975-05-06
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Expires: 1994-04-12
Abstract
Abstract An automatic pipe welding apparatus for end to end joining of pipes of large diameter. The machine incorporates means for striking an arc between the ends of two pipes to be joined together. A radial electro-magnetic field traversing the gap causes the arc to travel at high speeds circumferentially along the edges of the pipes. Means are provided for internally clamping and holding the two pipes at a pre-set distance from one another during the arcing period, along with means for forging the weld. Control means are provided for delivering a pre-set program of electric arc current versus time.
Inventors
- 👤 David Sciaky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:07
CPC Classifications
B; B23; B23K; B23K37/00; B23K37/04; B23K37/053; B23K37/0531; B23K9/00; B23K9/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
353 words
An apparatus for welding girth joints between the adjacent ends of pipes laid end to end comprising: a tube approximately equal in length to the longest pipe to be welded; three hydraulic cylinders fastened in tandem to one end of the said tube, each cylinder forming a sealed chamber of annular form coaxial with the longitudinal axis of the said tubing; a second tube telescoped and slidable within the first tube, one end of said second tube fastened to a piston slidable within the first of said annular chambers and having fastened at its opposite end a means for clamping the said pipe to the said second tube; a third tube telescoped within the said second tube and fastened at one end to a second piston which is slidable within the second of said group of cylinders in tandem, the said third tube having fastened close to its other end and concentric with its axis a pair of solenoid coils separated from each other by a distance of approximately 1 inch; a disk whose outer diameter is approximately 2 inches less in diameter than the inside diameter of the pipe mounted over the end of the said third tube; a fourth telescoping tube within the said third tube whose one end is fastened to a third piston slidable within the third cylinder in tandem and extending beyond the third piston, the other end of the said fourth tube extending beyond the end of the said third tube and having fastened to it beyond the end of the third tube a second clamping device electrically insulated from said fourth tube for clamping the second of two pipes to be welded together; flange means fastened to the end of said fourth tube for retaining the said second clamping means in a fixed position on the outer surface of the said tubing, said flange having means for supporting an inner bead cleaning tool on its outer surface so that the tool lies along the axis of the said tubing; and means for producing an alternating current arc between the ends of the pipes to be welded.
Claim 2
Independent Claim
353 words
An apparatus for welding girth joints between the adjacent ends of pipes laid end to end comprising: a tube approximately equal in length to the longest pipe to be welded; three hydraulic cylinders fastened in tandem to one end of the said tube, each cylinder forming a sealed chamber of annular form coaxial with the longitudinal axis of the said tubing; a second tube telescoped and slidable within the first tube, one end of said second tube fastened to a piston slidable within the first of said annular chambers and having fastened at its opposite end a means for clamping the said pipe to the said second tube; a third tube telescoped within the said second tube and fastened at one end to a second piston which is slidable within the second of said group of cylinders in tandem, the said third tube having fastened close to its other end and concentric with its axis a pair of solenoid coils separated from each other by a distance of approximately 1 inch; a disk whose outer diameter is approximately 2 inches less in diameter than the inside diameter of the pipe mounted over the end of the said third tube; a fourth telescoping tube within the said third tube whose one end is fastened to a third piston slidable within the third cylinder in tandem and extending beyond the third piston, the other end of the said fourth tube extending beyond the end of the said third tube and having fastened to it beyond the end of the third tube a second clamping device electrically insulated from said fourth tube for clamping the second of two pipes to be welded together; flange means fastened to the end of said fourth tube for retaining the said second clamping means in a fixed position on the outer surface of the said tubing, said flange having means for supporting an inner bead cleaning tool on its outer surface so that the tool lies along the axis of the said tubing; and means for producing an alternating current arc between the ends of the pipes to be welded.
Claim 3
Dependent Claim
109 words
An apparatus as in claim 1 in which the clamping means comprises an inner section in the shape of the frustrum of an eight sided pyramid, eight clamping segments surrounding the said inner section each of which has an inward facing surface in contact with one of the eight sides of the said pyramid and an outward facing surface in contact with the inner wall of the pipe to be clamped, a multiplicity of continuous springs arranged in grooves formed circumferentially along the outward facing surfaces of the said segments, the said springs urging the said segments radially and inwardly away from the inner surface of the said pipe.
Claim 4
Dependent Claim
26 words
An apparatus as in claim 1 in which the said pair of solenoid coils is fed from a direct current source whose output current is adjustable.
Claim 5
Dependent Claim
28 words
An apparatus as in claim 1 including means connected to it for controlling the arc current so that it follows a pre-set program of arc current versus time.
Claim 6
Dependent Claim
24 words
An apparatus as in claim 4 including means for controlliNg the arc current so that it follows a parabolic law with respect to time.
Claim 7
Dependent Claim
22 words
An apparatus as in claim 1 including means for adjusting the gap between the adjacent ends of two pipes to be welded.
References Cited (Backward Citations)
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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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |