FprEN 18205

Qualification of Welding Procedures for Plastic Materials

Publication date:   Jul 16, 2026

Scope

This document specifies a procedure to qualify a preliminary welding procedure specification (pWPS) by welding procedure tests to produce a qualified welding procedure specification (WPS).
NOTE 1 The application of this document ensures that the qualification of the pWPS is carried out according to a uniform test procedure.
NOTE 2 The primary purpose of welding procedure qualification is to demonstrate that the joining process proposed for construction is capable of producing joints having the required mechanical properties for the intended application.
This document applies to the following thermoplastic welding processes:
— hot gas welding: round nozzle, speed, wedge;
— extrusion welding;
— heated tool welding: butt, socket, wedge;
This document applies to the welding of the following products:
— sheet
— pipe (unreinforced, solid wall only);
— fittings (unreinforced only);
— lining membrane;
This document covers the welding of the following groups of materials:
a) for sheets, pipes and fittings:
— PVC (PVC-U, PVC-C);
— PP (PP-B, PP-H, PP-R);
— PE;
— PVDF;
— ECTFE, PFA and FEP;
b) for lining membranes:
— PVC-P;
— PE;
— ECB;
— PP;
c) for pipes and fittings only:
— PA-U (PA-U 11, PA-U 12).