By E.N. Gregory and A.A. Armstrong
Welding Symbols on Drawings is based on ISO 2553 1992 and ANSI/AWS A2.4 1998. The American system of symbolization is currently used by approximately half of the world's industry. Most of the rest of the world use ISO. This contemporary book provides an up-to-date review on the application of ISO and AWS standards and a comparison between them. For many years an ISO committee has been working on combining ISO and AWS to create a combined worldwide standard, but while discussions continue this could take many years to achieve. The current European and ISO standards and the American standard are substantially similar, but the ANSI/AWS standard includes some additional symbols and also symbols for non-destructive testing.