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Welding Codes and Standards

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TWI's welding engineers have extensive experience operating to international codes, standards, regulations and specifications from procedure qualification for original fabrication to quality control and quality assurance during welding to repair process development in all industry sectors.

Our welding engineers can provide an expert opinion on all the major welding and fabrication standards:

Qualification Codes

BS EN 15614, EN 287, EN ISO 9606, BS 4872, ASME Section IX, CAA A8-10


Pressure Equipment Directive (PED)

Fabrication Standards/codes

PD5500, EN 13480, EN 13445, BS 4515, EN 1011, BS5400, DIN 6700
ASME B&PV Section VIII, Section III, Section XI, B31.1, B31.3, B31.4, B31.8
AWS D1.1
API 1104, API 510, API 620

Consumables standards

AWS, ASME Section IIC, EN standards

Industry specific codes/standards

EEMUA 153, 158, DNV OS F101, ISO15156, Lloyds rules, MOD, ABS rules etc.
BS 7570 (Validation of equipment)
prEN50499 (EMF)

The Arc Welding department is also noted for its work on Health and Safety: welding fume (and hazards) and EMF in welding.

To keep up-to-date with the latest editions of international codes and standards

Our welding engineers are qualified to work according to the main international welding standards, many of them are involved in the standardisation committees and their skills have often proven crucial in providing clarification on the intent of clauses within welding standards.

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
  • Formulate and justify a request for concession from standard or contractual requirements

For more information please email: