GB/T 2654-2008 specifies the test method of welded joint Hardness. Welded joint Hardness affects its performance and service life. The standard introduces a variety of hardness testing methods and clarifies the scope of application. Requirements are put forward for specimen preparation, including shape, size, processing accuracy, etc. Detailed description of the selection and calibrating of test equipment. Standardized test process, such as loading force size, loading speed, load holding time and other operation details. Results representation and treatment methods are also specified. Provides a unified specification for the accurate determination of welded joint Hardness, helps evaluate welding mass, and ensures the safe and reliable operation of welded structures. It is widely used in welding-related industries for quality control.