GB/T 25774.3 - 2023 focuses on the T-joint fillet weld sample link in the inspection of welding materials. It details the sample preparation process, from the selection of base materials, groove processing, to the setting of welding process parameters, to ensure the weld mass. Clearly specify the requirements for the use of welding materials, standardize the operation details to ensure conformity. In terms of inspection, it covers Appearance inspection, dimensional measurement and nondestructive testing, and gives the qualification criteria. The standard provides a unified specification for accurately evaluating the performance of welding materials in the application of T-joint fillet welds, helping to improve the welding mass, and is widely used in many industries that rely on welding technology, such as machinery manufacturing and construction.