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Welding Procedures Specifications

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TWI's welding engineers support TWI's Industrial Members in developing welding procedures and 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, Civil Aviation Authority (CAA) procedures.

TWI's welding engineers have also built a database of pre-written standard welding procedure specifications based on experience and evaluation. These cover a variety of common joint types and have proved to be very popular amongst our Industrial Members.

Third Party Witnessing

Third party witnessing of welding procedure qualification and welder qualification (welding performance qualification), is carried out by TWI Certification Ltd, a separate company created in 1993 in order to separate TWI's activities in the field of certification. TWI Certification Ltd is the recognized third party for the Pressure Equipment Directive (PED).

For further information see Job knowledge for welders - Standards - Approval of welding procedures, welders and welding operators.

Our range of 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 - weld repairs.

TWI can help you to improve your competitiveness in international markets, if you need to:

  • Formulate your welding procedures according to EN, ISO, ASME and other international standards

  • Comply with changing contractual requirements

  • Update your information on foreign standards

  • Obtain advice on certification

For more information please email


For more information please email: