Below are some useful links :-
American Welding Society
Asociación Española de Soldadura y Tecnologías de Unión
Belgian Welding Institute
Canadian Welding Society
Charter plc
DVS (Deutsche Verband für Schweißen und verwandte Verfahren, German Welding Society)
E O Paton Electric Welding Institute
European Welding Federation
FORCE Institute
Hobart Institute of Welding Technology
Institut für Schweißtechnische Fertigungsverfahren RWTH-Aachen
Instituto de Soldadura e Qualidade
Instytut Spawalnictwa
International Institute of Welding
Italian Institute of Welding
Nederlands Instituut voor Lastechniek
New Zealand Institute of Welding
Norsk Sveiseteknisk Forbund
SLV Duisburg Ltd
Svetskommissionen
Svetstekniska Föreningen
Swedish Institute for Metals Research
The Thai Welding Society
The Welding Institute
Welding Technology Institute of Australia