Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1983-02-23
1985-05-07
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
G01N 500
Patent
active
045150206
ABSTRACT:
A method and device for ensuring correct assembly of screwed pipejoints having at least one stop. During assembly the screwing torque is measured continuously, the value of the second differential of the screwing torque is determined uninterruptedly, and the maximum of this second differential is checked to exceed a predetermined value.
The device includes in combination: a means of converting into electric voltage the value of the tightening torque applied at every instant during the assembly of the joint, an electronic device for carrying out the calculation of the second differential of the curve of electric voltage so measured, and a device enabling the value of this second differential to be compared with a reference value for giving a signal when the maximum of the second differential exceeds or does not exceed the reference value.
REFERENCES:
patent: 3974685 (1976-08-01), Walker
patent: 4008773 (1977-02-01), Wallace et al.
patent: 4023406 (1977-05-01), Benz
patent: 4027530 (1977-06-01), Tambini et al.
patent: 4104778 (1978-08-01), Vliet
patent: 4106176 (1978-08-01), Rice et al.
patent: 4361945 (1982-12-01), Eshghy
Ciarlante Anthony V.
Vallourec
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