本文件给出了钢、镍、钛及其合金电子束和激光束焊接接头缺陷等级的要求和建议。给出了三个等级，以允许广泛的焊接制造应用。质量等级B对应完工焊缝的最高要求。水平指的是生产质量，而不是生产产品的适用性。本文件适用于电子束和激光束焊接:-钢、镍、钛及其合金；-焊接有或没有附加焊丝的所有类型的焊缝；-电子束和激光束焊接用厚度等于或大于0.5mm的材料。本文件的目的是确定正常制造过程中可能出现的典型缺陷的尺寸。它可以在焊接接头生产的质量体系中使用。它提供了三组维度值，从中可以为特定应用程序进行选择。每种情况下所需的质量水平由应用标准或责任设计师与制造商、用户和\/或其他相关方共同确定。预计质量水平将在开始生产前规定，最好是在询价或订购阶段。出于特殊目的，可能需要规定额外的细节。当焊接产品中存在与本文件中规定的接头几何形状和尺寸的重大偏差时，有必要评估本文件的规定在多大程度上适用。本文件不包括冶金方面，如晶粒度、硬度。本文件不涉及用于检测缺陷的方法。本文件直接适用于焊缝的目视检查，不包括推荐的其他无损检测方法或尺寸确定方法的细节。使用这些限值来建立适用于无损检测方法（如超声波、射线照相和渗透检测）的适当标准存在困难，这些限值可能需要附加的检验、检查和检测要求来补充。

This document gives requirements and recommendations on levels of imperfections in electron and laser-beam welded joints in steel, nickel, titanium and their alloys. Three levels are given in such a way as to permit application for a wide range of welded fabrications. Quality level B corresponds to the highest requirement of the finished weld. The levels refer to production quality and not to the fitness-for-purpose of the product manufactured. This document applies to electron and laser beam welding of: — steel, nickel, titanium and their alloys; — all types of welds welded with or without additional filler wire; — materials equal to or above 0,5 mm thickness for electron and laser beam welding. The purpose of this document is to define the dimensions of typical imperfections which can be expected in normal fabrication. It can be used within a quality system for the production of welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application. The quality level necessary in each case is defined by the application standard or the responsible designer in conjunction with the manufacturer, user and/or other parties concerned. The quality level is expected to be prescribed prior to the start of production, preferably at the enquiry or order stage. For special purposes, additional details may need to be prescribed. When significant deviations from the joint geometries and dimensions stated in this document are present in the welded product, it is necessary to evaluate to what extent the provisions of this document can apply. Metallurgical aspects, e.g. grain size, hardness are not covered by this document. This document does not address the methods used for the detection of imperfections. This document is directly applicable to visual examination of welds and does not include details of recommended methods of detection or sizing by other non-destructive means. There are difficulties in using these limits to establish appropriate criteria applicable to non-destructive testing methods, such as ultrasonic, radiographic and penetrant testing, and they can need to be supplemented by additional requirements for inspection, examination and testing.