flak bottomed holes

[Александр Рыжов]

Про ультразвуковой контроль. Что такое flak bottomed holes? Заранее благодарю за помощь!

This procedure describes the Inspection methodology for pulse - echo Ultrasonic Examination by the longitudinal wave Contact method for heat treated Steel Castings to detect the discontinuities if any.

It requires calibration using a series of test blocks containing ***flak bottomed holes***

REFERENCES:

ASTM A-609 Standard Practice for Ultrasonic Examination on Castings

ASTM E-114 Ultrasonic Pulse-Echo Straight-Beam Examination by contact method ASTM E-317 Recommended Practice for evaluating performance Characteristics of Pulse-Echo Ultrasonic Testing System

ASTM E-428 Fabrication and Control of Steel Reference Blocks used in Ultrasonic

Inspection.

ASME B16.34-Steel Valves -Appendix IV

ASME Boiler and Pressure Vessel Code, Section V and Section VIII

[Александр Рыжов]

Похоже, должно быть flat bottomed hole s, не догадался сразу .