Weld Procedures

Independent Third-Party Witnessing to EN ISO, ASME, PD 5500, EN 13445, AWS and More.

TÜV UK provides independent Third-Party Witnessing and Verification of Welding and Brazing Procedure Qualification Tests, across a wide range of materials, processes, and sectors. Operating under UKAS accreditation to ISO/IEC 17020, we are authorised to witness qualification tests for procedures used in structural fabrication, pressure equipment, piping, aerospace, transportable pressure equipment, and brazed assemblies. 

Our engineers operate throughout the UK and Ireland, supporting manual, semi-automatic, mechanised, and fully automated welding and brazing procedure qualifications, either on-site or in-works. 

• Witnessing of Welding and Brazing Procedure Qualification Tests (WPQR/BPQR).
• Support in confirming applicable standards, joint configurations, and essential variables.
• Verification in accordance with EN ISO, ASME IX, PD 5500, EN 13445, AWS, NORSOK, and more.
• Coordination of mechanical, metallurgical, and NDT testing via UKAS-accredited laboratories.
• Certification issued by TÜV UK on successful qualification.
• Applicable to manual, semi-automatic, mechanised, and automated process types.
• Broad coverage across plate, pipe, vessel, and refrigeration systems, including dissimilar materials and overlays.

TÜV UK is a UKAS-accredited Type A Inspection Body, Approved Body, and Recognised Third Party Organisation (RTPO). All services are delivered impartially in accordance with international standards and UKAS requirements. 

• Welding Procedure Qualification Record (WPQR):
  Formal record of the mechanical and metallurgical performance of a welding procedure, including:
  • Process type, joint configuration, material group, thickness range, and test results.
  • Applicable to manual, semi-auto, mechanised, and automated welding systems.
• Brazing Procedure Qualification Record (BPQR):
  Documentation of the successful qualification of a brazing procedure, including:
  • Base material, filler alloy, heating method (torch, induction, furnace, etc.), flux, joint clearance, and test results.
• Welding Procedure Specification (WPS):
  A controlled shop-floor document specifying:
  • Joint design, process parameters, material, position.
  • Electrical parameters, consumables, preheat/interpass/PWHT.
• Brazing Specification:
  Includes filler metal, flux, heating source, temperature range, joint details, and inspection requirements.

TÜV UK witnesses and verifies that the procedure test complies with the selected standard. We do not approve procedures for design or suitability in service — that responsibility remains with the manufacturer or design authority. 

1. Initial Technical Review
We confirm applicable standards and variables: material group, joint type, position, process, and test requirements. 

2. Procedure Test Witnessing
Carried out at your facility or external test centre. Applicable to: 

• Manual welding (e.g. MMA, TIG, MIG)
• Semi-automatic (e.g. MAG with manual control)
• Mechanised and fully automated welding (e.g. SAW, orbital, robotic MIG/MAG)
• Torch, furnace, induction, and dip brazing 

3. Testing & Evaluation
We coordinate required testing (visual, mechanical, metallurgical, NDT) with UKAS-accredited laboratories and validate results. 

4. Certification Issued
A TÜV UK WPQR or BPQR is issued, clearly stating the standard, process, scope, and range of approval.