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JPS55139189A - Inspecting method and apparatus of projection welding - Google Patents

Inspecting method and apparatus of projection welding

Info

Publication number
JPS55139189A
JPS55139189A JP4709279A JP4709279A JPS55139189A JP S55139189 A JPS55139189 A JP S55139189A JP 4709279 A JP4709279 A JP 4709279A JP 4709279 A JP4709279 A JP 4709279A JP S55139189 A JPS55139189 A JP S55139189A
Authority
JP
Japan
Prior art keywords
resistance value
circuit
supplied
electrodes
resistance
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
JP4709279A
Other languages
Japanese (ja)
Other versions
JPS6160755B2 (en
Inventor
Yoshitoshi Yamamoto
Mikio Inada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4709279A priority Critical patent/JPS55139189A/en
Publication of JPS55139189A publication Critical patent/JPS55139189A/en
Publication of JPS6160755B2 publication Critical patent/JPS6160755B2/ja
Granted legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE: To judge the goodness or not of the captioned weld zone rapidly and accurately in process by operating the final resistance value of dynamic resistance at the end of current supply and the minimum resistance value of dynamic resistance during current supply period.
CONSTITUTION: A suspension lug 14 having projections and a flat plate 16 are pressure-sandwiched by a pair of electrodes 18, 20 and welding current is supplied to the welding works 14, 16 by way of electrodes 18, 20. The outputs of detecting circuits 22, 26 are divided by the 1st arithmetic circuit 28 to obtain the ratio between the output voltage V(t) and output current I(t). The output of the circuit 28 which obtains the dynamic resistance R(t)=V(t)/I(t) between the electrodes 18, 20 is supplied to a final resistance value holding circuit 30 and minimum resistance value holding circuit 32. The resistance R at a desired point is stored in the circuits 30, 32. The final resistance value R1 and minimum resistance value R2 of the circuits 30, 32 obtained during current supplying are supplied to a differential amplifier circuit 34 where R1-R2 is operated. In a differential amplifier circuit 38, said value is compared with the reference value Rs from a reference voltage setting circuit 40 and only when R1-R2 is smaller than Rs, an alarm signal AL is supplied to a display device 42.
COPYRIGHT: (C)1980,JPO&Japio
JP4709279A 1979-04-17 1979-04-17 Inspecting method and apparatus of projection welding Granted JPS55139189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4709279A JPS55139189A (en) 1979-04-17 1979-04-17 Inspecting method and apparatus of projection welding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4709279A JPS55139189A (en) 1979-04-17 1979-04-17 Inspecting method and apparatus of projection welding

Publications (2)

Publication Number Publication Date
JPS55139189A true JPS55139189A (en) 1980-10-30
JPS6160755B2 JPS6160755B2 (en) 1986-12-22

Family

ID=12765535

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4709279A Granted JPS55139189A (en) 1979-04-17 1979-04-17 Inspecting method and apparatus of projection welding

Country Status (1)

Country Link
JP (1) JPS55139189A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60238092A (en) * 1984-05-10 1985-11-26 Nagata Kogyo Kk Resistance welding method of hinge piece
KR100847595B1 (en) 2007-06-15 2008-07-21 (주) 금영테크 Series spot welding method to prevent welding marks from remaining on the surface of the welded object exposed to the outside
CN111693573A (en) * 2020-05-12 2020-09-22 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） Battery tab welding quality evaluation method and device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60238092A (en) * 1984-05-10 1985-11-26 Nagata Kogyo Kk Resistance welding method of hinge piece
KR100847595B1 (en) 2007-06-15 2008-07-21 (주) 금영테크 Series spot welding method to prevent welding marks from remaining on the surface of the welded object exposed to the outside
CN111693573A (en) * 2020-05-12 2020-09-22 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） Battery tab welding quality evaluation method and device

Also Published As

Publication number Publication date
JPS6160755B2 (en) 1986-12-22

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