This national standard specifies the general methods for testing the defects in the weld joints/heat-affected zone, determining the defect position/size and evaluating the defects, as well as classifying the testing results.
This national standard is applicable to manual ultrasonic testing under complete-penetration butt-weld impulse reflection method for the ferrite steel whose thickness of base metal is no less than 8 mm.
This national standard is not applicable to the welds of the cast steel and Austenitic stainless steel, the butt welds of the steel tube whose external diameter is less than 159 mm, the fillet welds of tube base whose internal diameter is less than or equal to 200 mm, and the longitudinal welds of the tube whose external diameter is less than 250mm and internal-external diameter ratio is less than 80%.
GB/T 11345-1989 The following standards are cited：
