Metallurgical imperfections are not included EN ISO Welding and allied processesClassification of geometric imperfections in metallic materialsPartFusion welding (ISO)Classification The imperfections are classified into the following six groups: PCracks PCavities PSolid inclusions PLack of fusion PImperfect shape ISO (E) Introduction This document is intended to be used as a reference in drafting application codes and/or other application standards. It contains a simplified selection of laser and electron beam welding imperfections based on the designations given in ISO EN ISO ;Free download as PDF File.pdf) or read online for free International Standard ISO was prepared by Technical Committee ISO/TC, Welding and allied processes, Subcommittee SC 7, NOTE In addition to the terms and definitions used in two of the three official ISO languages (English and French), this part of ISO gives the equivalent terms and definitions in ILNAS-EN ISO Welding and allied processesClassification of geometric imperfections in metallic materialsPartFusion welding (ISO) EN ISO Welding and allied processesClassification of geometric imperfections in metallic materialsPartFusion welding (ISO)Classification The ISO, Welding and allied processes — Classification of geometric imperfections in metallic materials — PartFusion weldingThis part of ISO serves as the basis for a precise classification and description of weld imperfections. In order to avoid any confusion, the types of imperfection are defined with explanations and illustrations where necessary ISO serves as the basis for a precise classification and description of weld imperfections. In order to avoid any confusion, the types of imperfection are defined with explanations and illustrations where necessary. STANDARD PREVIEW.