Patent US3916304A successfully refreshed from Google Patents.
US3916304A
Expired / Lapsed
US
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Method for nondestructive testing of weld clusters
Assignee: University of Akron
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Filing: 1974-01-17
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Granted: 1975-10-28
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Expires: 1994-01-17
Abstract
Abstract Disclosed is a method for the nondestructive testing of weld clusters having at least a first and a second weld joining metal elements including the steps of injecting a current into one of the elements from a suitable source by contacting each of the elements with a current probe therefrom. A first current density is then measured between the current probe and the first weld and a second current density is measured between the current probe and the second weld and the first current density is then compared with the second current density so as to determine the relative quality of said welds.
Inventors
- 👤 Louis E Roemer
- 👤 Donald C Thorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01R; G01R19/00; G01R19/08; G01R27/00; G01R27/02; G01R27/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A method for the nondestructive testing of weld clusters having a plurality of welds joining two metal elements comprising the steps of: injecting a current into one of the elements by contacting each of the elements with a current probe at the approximate geometric center of the welds within the cluster, measuring the total resistance of all the welds within the weld cluster thereby determining the existence of clusters in which all welds are of a poor quality, measuring a first current density between said current probe and one weld, measuring additional current densities between said current probe and the additional welds of the weld cluster, and comparing said first current density with each said additional current density so as to determine the relative quality of the welds.
Claim 2
Independent Claim
128 words
A method for the nondestructive testing of weld clusters having a plurality of welds joining two metal elements comprising the steps of: injecting a current into one of the elements by contacting each of the elements with a current probe at the approximate geometric center of the welds within the cluster, measuring the total resistance of all the welds within the weld cluster thereby determining the existence of clusters in which all welds are of a poor quality, measuring a first current density between said current probe and one weld, measuring additional current densities between said current probe and the additional welds of the weld cluster, and comparing said first current density with each said additional current density so as to determine the relative quality of the welds.
Claim 3
Dependent Claim
33 words
A method for the nondestructive testing of weld clusters, as in claim 1, wherein said current density is measured by a voltmeter which determines the potential difference across a portion of the element.
Claim 4
Dependent Claim
50 words
A method for the nondestructive testing of weld clusters, as in claim 1, wherein said first current density is measured on a line connecting said current probe and said first weld and wherein said second current density is measured on a line connecting said current probe and said second weld.
Claim 5
Dependent Claim
30 words
A method for the nondestructive testing of weld clusters, as in claim 3, wherein said first and said second current densities are measured at equal distances from said current probe.
Claim 6
Dependent Claim
23 words
A method for the nondestructive testing of weld clusters, as in claim 1, wherein said current is injected from a constant current source.
Claim 7
Dependent Claim
25 words
A method for the nondestructive testing of weld clusters, as in claim 5, including the step of measuring the voltage across said constant current source.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |