How To Scaning UT with Angle Probe 70 degree

Almost all angle beam testing is performed at standard angles of 45, 60, and 70 degrees, although 30 degree and 90 degree (surface wave) wedges are also used in some specialized cases. As a general rule, higher angle wedges (60 and 70 degree) are commonly used when metal thickness is less than approximately 25 mm (1”), and lower angle wedges (45 degree) are commonly used when metal thickness is greater than approximately 50 mm (2”). Two or three different angles may be used in a given test based on part geometry and flaw resolution requirements. Further information can be found in common inspection codes. The wedge angle in a given case should be high enough that a first leg signal can reach the weld root from a position on the part surface that is not obstructed by the weld