| 摘要 |
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.
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