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Procedure Qualification

Welding engineers and our other process specialists at TWI support Industrial Members in developing and qualifying welding / production procedures. This includes preparing welding procedures specifications (WPS) or reviewing existing ones according to the major welding standards, such as ASME IX, EN ISO 15609-1, AWS D1.1, and Civil Aviation Authority (CAA) procedures.

Our expertise covers all aspects of the fabrication and service life of welded components and a wide range of applications, among which are structural welding, overlay welding, hard facing and weld repairs.

This can be supported by third-party witnessing of welding procedure qualification and welder qualification (welding performance qualification); carried out by TWI Certification Ltd, a separate company created in 1993 to separate TWI's activities in the field of certification. TWI Certification Ltd is a recognised third party for the Pressure Equipment Directive (PED).

Key outputs at this phase will include:

  • Process/procedure qualification
  • Personnel - welder/operator - qualification
  • Inputs into design reviews and quality plans

By this stage, you will have the capability of producing a prototype component/system in a production relevant environment; and understand the manufacturing maturity and risk for the technologies under consideration. You can then make a confident decision on the preferred system that provides a low risk solution to take to production.

For more information. please email

For more information please email: