GB/T 25774.2 - 2023 specifies the preparation of samples for mechanical properties of steel welded joints. For single-sided single-pass welding and double-sided single-pass welding of steel, from the selection of base metal, the determination of welding process, to the specific welding process, the welding current, voltage, welding speed and other parameters are clarified. Detailed description of the sample interception position and processing size accuracy requirements to ensure that the sample can accurately reflect the mechanical properties of welded joints. By standardizing the preparatory process, it provides a reliable basis for the performance evaluation of welding materials in steel welding, which is conducive to the mass control of welding materials. It is widely used in construction, bridges, machinery manufacturing and other welding-related industries where steel is the main material.