LOW-TEMPERATURE CONTACT LIQUID Russian patent published in 2019 - IPC G01N29/28 G01N29/04 

FIELD: defectoscopy.

SUBSTANCE: invention relates to ultrasonic flaw detection of metal structures and structures at negative temperature, namely low-temperature contacting liquid (LCL) intended for acoustic contact at ultrasonic nondestructive inspection of rails, switch assemblies and welded joints with detachable flaw detection devices at negative temperature of atmospheric air. Disclosed is a low-temperature contacting liquid which contains water and target additives and alcohol dissolved therein, wherein alcohol is an isopropyl alcohol and ethylene glycol or industrial propylene glycol, and the target additives are a surfactant – sodium dodecyl sulphate and a perfume, with the following ratio of components, wt%: drinking water – 1.0–20.0; sodium dodecyl sulphate 0.1–3.0; isopropyl alcohol 44–93.4; ethylene glycol or propylene glycol technical 5.0–30.0; perfume 0.5–3.0.

EFFECT: improved accuracy of measurements at low temperatures below 30 °C, and providing a high degree of acoustic contact with ultrasonic nondestructive contact of rails, switch assemblies and welded joints with detachable flaw detection devices.

1 cl