JPS5720659A - Detection of weld defect - Google Patents

Detection of weld defect

Info

Publication number
JPS5720659A
JPS5720659A JP9507980A JP9507980A JPS5720659A JP S5720659 A JPS5720659 A JP S5720659A JP 9507980 A JP9507980 A JP 9507980A JP 9507980 A JP9507980 A JP 9507980A JP S5720659 A JPS5720659 A JP S5720659A
Authority
JP
Japan
Prior art keywords
gate
time
interface
welding machine
secondary voltage
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
Application number
JP9507980A
Other languages
Japanese (ja)
Inventor
Koji Ishihara
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 JP9507980A priority Critical patent/JPS5720659A/en
Publication of JPS5720659A publication Critical patent/JPS5720659A/en
Pending 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

Abstract

PURPOSE:To precisely cut periodically produced arc noise by cutting the input to a defect detecting mechanism for a constant short time from the point of the time when the secondary voltage of a welding machine has attained a set value. CONSTITUTION:A discriminator 10 receives the secondary voltage of a welding machine and when it exceeds a reference value, the discriminator operates a gate generating circuit 11. The circuit 11 generates a gate inhibiting taking-in of data for a constant short time. Delay circuits 12a-12d delay the generation of the gate by the propagation time of high frequency sound. A signal processor 13 measures the peak-to-peak values, energy, etc. of the acoustic emission wave amplified and selected by main amplifiers 7a-7d and comparators 8a-8d, measures arrival time differences as well and converts these from analog to digital. The processed signals are inputted via an interface 14 to a central processing unit 15, where they are processed by the programs having beforehand been inputted, and the position localization of defective parts, energy analysis, pulse height analysis, counting of generation frequencies, etc. are accomplished, results whereof are displayed via the interface 14.
JP9507980A 1980-07-14 1980-07-14 Detection of weld defect Pending JPS5720659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9507980A JPS5720659A (en) 1980-07-14 1980-07-14 Detection of weld defect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9507980A JPS5720659A (en) 1980-07-14 1980-07-14 Detection of weld defect

Publications (1)

Publication Number Publication Date
JPS5720659A true JPS5720659A (en) 1982-02-03

Family

ID=14127944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9507980A Pending JPS5720659A (en) 1980-07-14 1980-07-14 Detection of weld defect

Country Status (1)

Country Link
JP (1) JPS5720659A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1700663A2 (en) * 2005-03-08 2006-09-13 Central Motor Wheel Co., Ltd. Welding method and welding equipment
JP2007111745A (en) * 2005-10-20 2007-05-10 Denso Corp Method and device for discriminating and evaluating abnormality of welding workpiece

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114980A (en) * 1975-04-02 1976-10-09 Babcock Hitachi Kk Noise removal circuit of ae measurement system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114980A (en) * 1975-04-02 1976-10-09 Babcock Hitachi Kk Noise removal circuit of ae measurement system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1700663A2 (en) * 2005-03-08 2006-09-13 Central Motor Wheel Co., Ltd. Welding method and welding equipment
EP1700663A3 (en) * 2005-03-08 2007-02-28 Central Motor Wheel Co., Ltd. Welding method and welding equipment
JP2007111745A (en) * 2005-10-20 2007-05-10 Denso Corp Method and device for discriminating and evaluating abnormality of welding workpiece

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