TS 7536

TS 7536 defines the classification terms and definitions used for imperfections in metallic fusion welded joints. Standards of this kind create a common vocabulary for describing weld imperfections, which helps reduce ambiguity in inspection records, technical communication, and training. The standard’s focus is limited to imperfections associated with fusion welding processes.

How weld imperfections are grouped

Fusion welding refers to joining methods in which the base material is locally melted, often with added filler metal. In that setting, imperfections may appear as cracks, porosity, slag inclusions, incomplete penetration, or geometric irregularities. In general technical practice, terminology standards like this one are used to identify the type, appearance, and location of a defect in a consistent way. The emphasis here is on naming and defining imperfections, rather than setting acceptance criteria or evaluating the effect of additional external stresses.

Terminology for inspection and documentation

• It covers imperfections in metallic joints produced by fusion welding.
• The scope addresses weld imperfections without considering additional external stresses on the weld.
• The defined terms support inspection reports, technical training, and consistent documentation.
• In wider welding practice, such classifications help separate one imperfection type from another during evaluation.

This document serves as a terminology reference for imperfections in welded joints. Its practical value lies in making weld-related communication more uniform and in preventing confusion between different kinds of imperfections. Although this TS 7536 edition has been withdrawn, its subject remains the classification and definition of weld imperfections.