JPS57157108A - Device for detecting welded part of metallic material - Google Patents
Device for detecting welded part of metallic materialInfo
- Publication number
- JPS57157108A JPS57157108A JP56042342A JP4234281A JPS57157108A JP S57157108 A JPS57157108 A JP S57157108A JP 56042342 A JP56042342 A JP 56042342A JP 4234281 A JP4234281 A JP 4234281A JP S57157108 A JPS57157108 A JP S57157108A
- Authority
- JP
- Japan
- Prior art keywords
- welded part
- probes
- detected
- transmitting
- steel pipe
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
Landscapes
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
PURPOSE:To detect welded part simply without contact, by using two probes which give ultrasonic wave signals to the metallic material and detect the reflected waves and detecting the difference between the detected levels of both probes. CONSTITUTION:A steel pipe 1 having a welded part 2 is rotated at a slow speed. The probes 3A and 3B are constituted by a winding of a core which is excited by a DC power source 4 and a transmitting and receiving winding to which a pulse current is supplied by a pulse generator 5. When the pulse current is applied to the transmitting and receiving winding under the state the DC magnetic field is applied to the steel pipe, varying distortion is formed on the surface of the steel pipe and propatated to the inside as an ultrasonic wave. The reflected wave from the inside is detected by the transmitting and receiving winding and inputted to amplifiers 6A and 6B. When the welded part 2 faces one of the probe, the difference between the detected signal levels of both probes is generated because the attenuation of the ultrasonic wave at the welded part is large. Said difference is detected by subtracting circuit 7, an integrating circuit 8, and a comparator 9, and a relay 10 is driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56042342A JPS57157108A (en) | 1981-03-25 | 1981-03-25 | Device for detecting welded part of metallic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56042342A JPS57157108A (en) | 1981-03-25 | 1981-03-25 | Device for detecting welded part of metallic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57157108A true JPS57157108A (en) | 1982-09-28 |
Family
ID=12633338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56042342A Pending JPS57157108A (en) | 1981-03-25 | 1981-03-25 | Device for detecting welded part of metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57157108A (en) |
-
1981
- 1981-03-25 JP JP56042342A patent/JPS57157108A/en active Pending
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