GB/T 29712-2013: Non-destructive testing of welds -- Ultrasonic testing -- Acceptance levels

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Scope

This standard specifies the ultrasonic acceptance level 2 and 3 for full
penetration welded joints in ferritic steels, which correspond to the quality levels
B and C welds in GB/T 19418. Since the level D welds usually do not require
ultrasonic testing in GB/T 19418, there is no ultrasonic testing acceptance level
corresponding to the quality level D weld requirements in GB/T 19418.
The acceptance levels of this standard apply to ultrasonic testing in accordance
with GB/T 11345.
This standard applies to the examination of full penetration ferritic steel welds,
with thicknesses from 8 mm to 100 mm. It can also be used for other types of
welds, materials and thicknesses above 100 mm, provided that the
examinations have been performed with necessary consideration of the
geometry and acoustic properties of the component, and an adequate
sensitivity can be employed to enable the acceptance levels of this standard to
be applied. Unless attenuation or requirements for higher resolution call for
other frequencies, the nominal frequency of probes used in this standard is
between 2M Hz and 5 MHz. The use of these acceptance levels in conjunction
with frequencies outside this range needs to be considered carefully.

Basic Data

Standard ID	GB/T 29712-2013 (GB/T29712-2013)
Description (Translated English)	Non-destructive testing of welds -- Ultrasonic testing -- Acceptance levels
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J33
Classification of International Standard	25.160.40
Word Count Estimation	16,195
Quoted Standard	GB/T 11345; GB/T 19418; GB/T 29711
Adopted Standard	ISO 11666-2010, MOD
Regulation (derived from)	National Standards Bulletin No. 19 of 2013
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the full penetration ferritic ultrasonic testing of welded joints - Acceptance levels 2 and 3. Acceptance of this standard grade 2 and 3, respectively, corresponding to GB/T in the 19418 B-and C-class weld quality requirements. Bec