The procedure followed by the company's welder for the welding of a structure is recorded (e.g. welding of steel sheets of certain thicknesses with a coated electrode or TIG). This is how a welding specification (Welding Procedure Specification - WPS) is formed, with specific parameters (type/quality/dimensions of materials, type/position of welding, V/A current parameters, etc.). The welding specification must be certified by the accredited body (EUROCERT) according to the ISO 15614 standard.
For certification, it is necessary to create a welding sample of dimensions defined by the above standard. The welding of the sample is done
according to the specification (WPS), in the presence of an inspector of the Accredited Body and sent to an accredited laboratory to carry out the
prescribed tests.