GB/T 27552-2021: Destructive tests on welds in metallic materials - Microhardness testing of welded joints

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Scope

This document specifies the general rules, specimen preparation, test procedures, test results
and test report of the microhardness testing of welded joints [the range of test force is generally:
0.98 N ~ < 49.03 N (HV 0.1 ~ < HV 5)] performed in accordance with GB/T 4340.1.
This document is applicable to the cross-sectional microhardness test of welded joints of
metallic materials with a large hardness gradient.
NOTE: the hardness test shall ensure that the highest hardness and lowest hardness of the weld
metal and the parent material on both sides (for dissimilar materials) can be measured.
This document is not applicable to the hardness test with the test force greater than or equal to
49.03 N as specified in GB/T 2654.
This document is not applicable to the Vickers hardness test of resistance spot, projection and
seam welds as specified in GB/T 39082.
This document is not applicable to the hardness test of narrow welded joint specimens, such as:
laser and electron beam, whose hardness test shall be performed in accordance with GB/T
35085.

Basic Data

Standard ID	GB/T 27552-2021 (GB/T27552-2021)
Description (Translated English)	Destructive tests on welds in metallic materials - Microhardness testing of welded joints
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J33
Word Count Estimation	12,198
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration