Ultrasonic inspection

Ultrasonic inspection at BESSEY is performed as an automatic continuous process, using phased-array technology.


This describes grid-pattern examination for sq./oct. and for hex. sections as well as a 100 % volumetric inspection of the core area, either with or without inspection of the edge zone. Such testing is suited to all the types of steel we offer, from unalloyed structural steel to highly-alloyed stainless and acid-resistant grades.

Testable area

Test type

Max. registration limit *

Ø 10 - 43 mm

100% volumetric inspection

uninspected edge zone of 2-3 mm

FBH 0.7 mm

Ø 10 - 36 mm

100% full volumetric inspection

with inspected edge zone

FBH 0.7 mm

hexagonal 10 - 30 mm

Grid-pattern examination

uninspected edge zone of 2-3 mm

FBH 1.0 mm

octagonal 10 - 30 mm

Grid-pattern examination

uninspected edge zone of 2-3 mm

FBH 1.5 mm

square 10 - 22 mm

Grid-pattern examination

uninspected edge zone of 2-3 mm

FBH 2.0 mm

* FBH = produced by means of a flat bottom hole


  • FBH-values are dependent upon the steelgrade

  • Uninspected bar ends (50mm on both sides)

  • Inspection for min. defect length of 10 mm possible

Other dimensions of FBH-values are available on request