GB1017061A - Improvements in or relating to methods of detecting flaws in solid material and of apparatus therefor - Google Patents
Improvements in or relating to methods of detecting flaws in solid material and of apparatus thereforInfo
- Publication number
- GB1017061A GB1017061A GB671261A GB671261A GB1017061A GB 1017061 A GB1017061 A GB 1017061A GB 671261 A GB671261 A GB 671261A GB 671261 A GB671261 A GB 671261A GB 1017061 A GB1017061 A GB 1017061A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stress
- weld
- rod
- coil
- tested
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
1,017,061. Testing materials for flaws. CENTRAL ELECTRICITY GENERATING BOARD D. H. LUCAS, H. L. CARSON and R. C. WRATTEN. May 23, 1962 [Feb. 23, 1961], No. 6712/61. Heading G1N [Also in Division H4]. A solid material is tested for flaws, using a flaw detector giving an output signal dependent on the presence of a flaw, by applying a variable stress to the material and detecting the variation in output signal corresponding to the varying stress. Rod 10 is fixed in insulating clamps 11, 12, one of which is driven by a moving coil vibrator 14. Current is passed through the rod between contacts 21 and 22, and the potential drop between contacts 24 and 25 is applied through filter 26 to an AC amplifier 27, phase sensitive detector 28 and meter 29 (Fig. 2 not shown). Transverse cracks in the rod are modified at the vibration frequency and the output component having this frequency is detected. Contacts 24, 25 may be placed closer together and arranged to be moved over the surface of the rod to locate a flaw. A weld joining two magnetic tubes may be tested by placing a coil around the tube on each side of the weld, detecting variations in the leakage flux at the weld using a search coil, and detecting variations in output of the coil at the vibration frequency. A similar arrangement for a non-magnetic tube comprises a search coil arranged in a bridge circuit and energized to induce eddy currents in the weld, variations in the impedance of the search coil being detected. The varying stress may be an impulse or a periodically repeated impulse, and may be a tensile, torsional, or bending stress. The applied stress may be similar to the stress expected during use of the sample, and may be applied to a part or the whole of a body. The stress may be produced by an unbalanced rotor. A pressure vessel may be tested using an oscillating piston acting on hydraulic filling the vessel. An ultrasonic flaw detector arrangement is also described (see Division H4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB671261A GB1017061A (en) | 1961-02-23 | 1961-02-23 | Improvements in or relating to methods of detecting flaws in solid material and of apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB671261A GB1017061A (en) | 1961-02-23 | 1961-02-23 | Improvements in or relating to methods of detecting flaws in solid material and of apparatus therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1017061A true GB1017061A (en) | 1966-01-12 |
Family
ID=9819399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB671261A Expired GB1017061A (en) | 1961-02-23 | 1961-02-23 | Improvements in or relating to methods of detecting flaws in solid material and of apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1017061A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138138A (en) * | 1983-04-13 | 1984-10-17 | Atomic Energy Authority Uk | Dynamic method for the detection of discontinuities in a body |
| GB2149915A (en) * | 1983-11-02 | 1985-06-19 | British Nuclear Fuels Ltd | An improved method of ultrasonic inspection |
-
1961
- 1961-02-23 GB GB671261A patent/GB1017061A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138138A (en) * | 1983-04-13 | 1984-10-17 | Atomic Energy Authority Uk | Dynamic method for the detection of discontinuities in a body |
| GB2149915A (en) * | 1983-11-02 | 1985-06-19 | British Nuclear Fuels Ltd | An improved method of ultrasonic inspection |
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