According to the county, ultrasonic testing will be done on 282 weld points, called butt welds, as the steel used in these areas, T-1, recently showed home some issues in an Ohio bridge.

It's undergoing ultrasonic testing as part of nationwide ... Administration and Caltrans as it completes the testing. There are 282 weld points that need to be inspected, Randall said.

Ultrasonic welding is based on high-frequency vibrations (typically between 20 and 40 kHz) that cause surface friction and viscoelastic heating at the weld. The most important process parameters are ...

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