GB/T 11345-2013 Non-destructive testing of welds—Ultrasonic testing—Techniques,testing levels,and assessment

Scope

This standard specifies the manual ultrasonic inspection technology for fusion welded joints of low ultrasonic attenuation (especially with low scattering attenuation) metal materials with a base material thickness of not less than 8 mm. During the inspection, the temperature of the weld and its base material is between 0 and 60 °C. This standard is mainly applied to fully penetrated welds where both the base material and the weld are ferritic steels.
This standard specifies the material-dependent ultrasonic values based on a longitudinal wave speed of (5,920±50) m/s and a transverse wave speed of (3,255±30) m/s for steel.
This standard specifies four inspection levels. Different inspection levels correspond to different defect detection rates. Appendix A provides guidance for selecting inspection levels A, B, and C.
This standard specifies the general requirements for using inspection level D only in special applications. Inspection level D can only be used when specified in the specification. Special applications include the detection of non-ferritic welds, partially penetrated welds, the detection of welds using automated equipment, and the detection of welds with temperatures outside the range of 0 to 60 °C.
This standard can be used for display evaluation or acceptance through any of the following techniques:
a) Evaluation based on display length and echo amplitude;
b) Evaluation based on display characteristics and display size (using probe movement technology).
It should be clearly specified which technique is used.

Development Information

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