Featuring AI

Streaking on aluminium extrusions can originate in billet metallurgy, die-controlled metal flow, thermomechanical conditions, cooling or longitudinal weld regions. This article explains why E6 etching can reveal these differences and presents a practical method for finding their probable cause.

Die lines, micro die lines and pick-up can all produce longitudinal marks on aluminium extrusions, but their causes are different. This article explains how to distinguish these defects, how they develop at the die bearing, and what happens to them during E6 etching and anodizing.