本文件定义了技术图纸上焊接接头符号表示的规则。这可能包括焊缝的几何形状、制造、质量和测试信息。本文件的原则也适用于焊接和钎焊接头。 众所周知，全球市场上有两种不同的方法来指定图纸上的箭头侧和另一侧。在本文件中: -带有后缀字母“A”的条款、表格和图形仅适用于基于双参考线的符号表示系统； -带有后缀字母“B”的条款、表格和图形仅适用于基于单一参考线的符号表示系统； -没有后缀字母“A”或“B”的条款、表格和图表适用于这两种系统。 本文件中显示的符号可与技术图纸上使用的其他符号组合，例如，用于显示表面光洁度要求。 提出了一种替代命名方法，可通过指定基本设计信息（如焊缝尺寸、质量等级等）在图纸上表示焊接接头。然后，由生产单位确定接头制备和焊接工艺，以满足规定要求。 注:本文件中给出的示例（包括尺寸）仅为说明性示例，旨在证明原则的正确应用。

This document defines the rules to be applied for symbolic representation of welded joints on technical drawings. This can include information about the geometry, manufacture, quality and testing of the welds. The principles of this document can also be applied to soldered and brazed joints. It is recognized that there are two different approaches in the global market to designate the arrow side and other side on drawings. In this document: — clauses, tables and figures which carry the suffix letter "A" are applicable only to the symbolic representation system based on a dual reference line; — clauses, tables and figures which carry the suffix letter "B" are applicable only to the symbolic representation system based on a single reference line; — clauses, tables and figures which do not have the suffix letter "A" or "B" are applicable to both systems. The symbols shown in this document can be combined with other symbols used on technical drawings, for example to show surface finish requirements. An alternative designation method is presented which can be used to represent welded joints on drawings by specifying essential design information such as weld dimensions, quality level, etc. The joint preparation and welding process(es) are then determined by the production unit in order to meet the specified requirements. NOTE Examples given in this document, including dimensions, are illustrative only and are intended to demonstrate the proper application of principles.