US3753085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-destructive testing apparatus for detecting both transverse and longitudinal weld defects with a single inspection
Assignee: TEX TUBE
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Filing: 1972-03-13
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Granted: 1973-08-14
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Expires: 1992-03-13
Abstract
Abstract Non-destructive testing apparatus for locating anomalies or defects in either a longitudinal or circle weld in a pipe, wherein the signal-to-noise ratio is increased by the use of bidirectional magnetization at the area of inspection and by the spacing of the anomaly detector probe off the pipe a predetermined distance, whereby discontinuities or weld anomalies at any point through the weld from the outside diameter to the inside diameter can be detected, and by a predetermined positioning of the coils of the probe, the weld anomalies may be detected whether extending predominantly longitudinally or laterally. The pipe may be inspected as it is run through the pipe mill during its manufacture, without utilizing a separate run of the pipe for the inspection.
Inventors
- 👤 A Morton
- 👤 D Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:15
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; B; B21; B21B; B21B38/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
Non-destructive testing apparatus for locating discontinuities, anomalies or other defects in a weld area of a pipe, comprising: a magnetizing yoke having spaced laterally extending pole pieces having a gap therebetween for positioning on opposite sides of a pipe in proximity to a weld area thereof to be inspected; a pair of magnetizing coils mounted on said yoke, with one coil being mounted with each laterally extending pole piece and with the axis of each coil extending laterally; a d.c. power means connected to said coils for energizing same and for creating a separate magnetic field in the vicinity of the weld area being inspected with the lines of flux in each magnetic field flowing towards each other and the weld area of the pipe but returning thereafter in opposite directions to form a closed loop of magnetic flux lines for each coil; and detector means including a detector coil disposed in the vicinity of the weld area being inspected in a plane substantially parallel to the surface of the pipe being inspected and between said pair of magnetizing coils for detecting defects in the weld.
Claim 2
Dependent Claim
186 words
Non-destructive testing apparatus for locating discontinuities, anomalies or other defects in a weld area of a pipe, comprising: a magnetizing yoke having spaced laterally extending pole pieces having a gap therebetween for positioning on opposite sides of a pipe in proximity to a weld area thereof to be inspected; a pair of magnetizing coils mounted on said yoke, with one coil being mounted with each laterally extending pole piece and with the axis of each coil extending laterally; a d.c. power means connected to said coils for energizing same and for creating a separate magnetic field in the vicinity of the weld area being inspected with the lines of flux in each magnetic field flowing towards each other and the weld area of the pipe but returning thereafter in opposite directions to form a closed loop of magnetic flux lines for each coil; and detector means including a detector coil disposed in the vicinity of the weld area being inspected in a plane substantially parallel to the surface of the pipe being inspected and between said pair of magnetizing coils for detecting defects in the weld.
Claim 3
Dependent Claim
35 words
The structure set forth in claim 1, wherein: said detector coil has its lower surface spaced off of the weld area to be inspected so as to be out of contact therewith at all times.
Claim 4
Dependent Claim
33 words
The structure set forth in claim 2, wherein: said detector coil has its lower surface spaced off of the weld area to be inspected at or within 0.025 inches of said lower surface.
Claim 5
Dependent Claim
32 words
The structure set forth in claim 1, wherein: the longitudinal axis of said detector coil is disposed therewith at an angle of about 45* relative to the longitudinal axis of the pipe.
Claim 6
Dependent Claim
85 words
The structure set forth in claim 4, wherein: said detector coil is one of four detector coils disposed in lateral alignment with each other and in substantially the same plane will all of said coils substantially parallel to the surface of the pipe being inspected and each having its longitudinal axis at an angle of about 45* relative to the longitudinal axis of the pipe, with adjacent coils being wound in the opposite directions and connected together to neutralize electrical noise from the detector coils.
Claim 7
Dependent Claim
30 words
The structure set forth in claim 1, including: means for moving said pipe longitudinally relative to said magnetizing coils, yoke and detector means for detecting defects in a longitudinal weld.
Claim 8
Dependent Claim
31 words
The structure set forth in claim 1, including: means for creatinG relative rotation between said pipe and said magnetizing coils, yoke and detector means for detecting defects in a circular weld.
Claim 9
Dependent Claim
82 words
The structure set forth in claim 2, including: means for moving said pipe longitudinally relative to said magnetizing coils, yoke and detector means for detecting defects in a longitudinal weld; and means engaging said pipe on at least two sides both upstream and downstream of said magnetizing yoke, coils and detector means to substantially eliminate vibration of the pipe, whereby the distance of the detector off the weld is maintained during the relative longitudinal movement between the pipe and the detector means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |