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põkkõmbluse keevitusdefekt – väike soon õmbluse juurepinna keskel mis on tingitud metalli kahenemisest tardumisel (vt põkkõmblus), shallow, deepening at the root of the weld resulting from shrinkage in butt weld (see: butt weld)
root concavity . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/root%20concavity/1/eng (10.07.2026)
