I had never heard of the term babbit before another one for my downunder dictionary. The Australian Standard 2824-1985 Ultrasonic evaluation of Metal Bearing bonds has both evaluation and classifications of quality.
Evaluation dtails the plotting of the poorly bonded areas.
Classification has 5 classifications of quality based on both the edge zones and total bearing surface. I hope this is of some use to you, I have a copy of the relevant pages in a works procedure if you require them for reference. The Australian Standard 2824-1985 Ultrasonic evaluation of Metal Bearing bonds has both evaluation and classifications of quality. Evaluation dtails the plotting of the poorly bonded areas. Classification has 5 classifications of quality based on both the edge zones and total bearing surface.