Macro examination is a procedure in which a specimen is etched and evaluated macro-structurally at low magnifications, typically x10 or lower.
For checking the quality of welds, macro examination can also be performed on a polished and etched cross-section of a welded material. During the macro examination, several features can be determined, including weld run sequence (weld procedure qualifications tests). Such defects as slag, porosity, lack of weld penetration, lack of sidewall fusion and poor weld profile in a sample can be assessed for compliance with relevant specifications. It is normal to look for such defects either by standard visual examination or at magnifications of up to x50.
TS EN ISO 17639: Destructive tests on welds in metallic materials – Macroscopic and microscopic examination of welds.