Ultrasonic Measurement of Bolt Pre-Load
Product Announcement from Norbar Torque Tools, Inc.
Ultrasonic measurement of bolt pre-load is made possible by introducing a sonic pulse at one end of the fastener and accurately measuring the time of flight (TOF) required for the echo to return from the opposite end. Using material constants, the USM-3 converts this TOF into an "ultrasonic length" of the fastener, providing a baseline from which future measurements will be made. When the fastener is tightened, the TOF increases and the USM-3 will again utilise material constants to eliminate the effects of stress and temperature variations on sound velocity, providing an accurate elongation or load measurement.
The USM-3 uses state of the art hardware and software to achieve these measurements with maximum automation, and minimizes the need for operator interpretation. Offering digital recording and transmission of data, in addition to analog signal output the USM-3 provides a complete system for measurement, recording, and control of fastener tension in the most demanding applications.
For further information or help with our Ultrasonic equipment, please use the following contact details:
USA & South America
Ultrasonic Bolting Hotline (USA): 1 407 923 3724
Norbar USA Toll Free: 1 877 566 7227
Norbar USA Telephone: 1 386 774 1184
Norbar USA Fax: 1 386 774 5648
Tel: +61 (0)8 8292 9777
Fax: +61 (0)8 8292 9799
Tel: +86 21 5146 0368
Fax: +86 21 6145 0369
UK and Rest of World
Tel: +44 (0)1295 270333
Fax: +44 (0)1295 753643