JPS57116250A - Detecting method for weld defect - Google Patents

Detecting method for weld defect

Info

Publication number
JPS57116250A
JPS57116250A JP56001623A JP162381A JPS57116250A JP S57116250 A JPS57116250 A JP S57116250A JP 56001623 A JP56001623 A JP 56001623A JP 162381 A JP162381 A JP 162381A JP S57116250 A JPS57116250 A JP S57116250A
Authority
JP
Japan
Prior art keywords
defect
signal
weld
period
detect
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.)
Granted
Application number
JP56001623A
Other languages
Japanese (ja)
Other versions
JPH0213266B2 (en
Inventor
Koji Ishihara
Koji Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP56001623A priority Critical patent/JPS57116250A/en
Publication of JPS57116250A publication Critical patent/JPS57116250A/en
Publication of JPH0213266B2 publication Critical patent/JPH0213266B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness

Abstract

PURPOSE:To detect a weld defect through detection of both an arc noise and a signal from a weld defect part, by a method wherein an input from an acoustic detecting sensor is cut during a period starting from a point of time when a secondary side voltage or a current of a welder attains a set value, and the cut is released at a given freqency. CONSTITUTION:A plural number of acoustic detecting sensors 3 is arranged at a given position against a torch 2 advancing along a beveling 1 to catch an acoustic signal generated from a defect part in a weld 4, and the signal is analyzed to detect a defect part. After a secondary side voltage or a current of a welder attains a set value, an input from the acoustic detecting sensor 3 is cut by a gate C for prohibiting it for a period of a half period +alpha of the secondary side voltage or current period, and the gate C is previously released at a specified frequency. This catches only a signal, entering at above a given level d, as a defect wave b to detect a weld defect through processing of the defective wave b.
JP56001623A 1981-01-10 1981-01-10 Detecting method for weld defect Granted JPS57116250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56001623A JPS57116250A (en) 1981-01-10 1981-01-10 Detecting method for weld defect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56001623A JPS57116250A (en) 1981-01-10 1981-01-10 Detecting method for weld defect

Publications (2)

Publication Number Publication Date
JPS57116250A true JPS57116250A (en) 1982-07-20
JPH0213266B2 JPH0213266B2 (en) 1990-04-03

Family

ID=11506651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56001623A Granted JPS57116250A (en) 1981-01-10 1981-01-10 Detecting method for weld defect

Country Status (1)

Country Link
JP (1) JPS57116250A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225690A (en) * 1975-08-18 1977-02-25 Western Electric Co Method and device for nonndestructively measuring real time of welding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225690A (en) * 1975-08-18 1977-02-25 Western Electric Co Method and device for nonndestructively measuring real time of welding

Also Published As

Publication number Publication date
JPH0213266B2 (en) 1990-04-03

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