AWS A2.4:2012 Standard Symbols for Welding, Brazing, and Nondestructive Examination establishes a method of specifying certain welding, brazing and nondestructive examination information by means of symbols. Contains detailed information and examples for the construction and interpretation of these symbols. This system provides a means of specifying welding or brazing operations and nondestructive examination, as well as the examination method, frequency and extent.