AWS A2。4:2020提供了一个指示焊接、钎焊和无损检测要求的系统。该系统包括焊缝、钎焊和无损检测方法的图形表示规定，以及至少规定其应用位置和范围的惯例。 可选元素和补充符号提供了指定附加要求的方法。文本中包含的数字旨在说明如何使用符号的正确格式和应用来传达焊接、钎焊和无损检测信息。它们不代表推荐的焊接、钎焊、无损检测或设计实践。有关钎焊的条款使用与焊接相同的符号。关于无损检测符号的条款规定了图纸上使用的符号，以规定用于确定部件适用性的无损检测。 本标准中包含的无损检测符号代表AWS B1最新版中讨论的无损检测方法。10M/B1。10，焊缝无损检测指南。各种无损检测方法的定义和使用细节见AWS B1。10M/B1。10.规范和规范中包含的限制也超出了本标准的范围。

AWS A2.4:2020 presents a system for indicating welding, brazing, and nondestructive examination requirements.The system includes provisions for the graphical representation of welds, brazes, and nondestructive examination methods with conventions for specifying, at a minimum, the location and extent of their application. Optional elements and supplementary symbols provide a means for specifying additional requirements.The figures included with the text are intended to show how the correct format and applications of symbols may be used to convey welding, brazing, and nondestructive examination information. They are not intended to represent recommended welding, brazing, nondestructive examination, or design practice.The clause addressing brazing uses the same symbols that are used for welding. The clause on nondestructive examination symbols establishes the symbols to be used on drawings to specify nondestructive examination for determining the suitability of components. The nondestructive examination symbols included in this standard represent nondestructive examination methods as discussed in the latest edition of AWS B1.10M/B1.10, Guide for the Nondestructive Examination of Welds. Definitions and the details for the use of the various nondestructive examination methods are found in AWS B1.10M/B1.10.The limitations included in specifications and codes are also beyond the scope of this standard.