Almex’s specially designed LUMEX™ Ultraviolet Light (UV) Porosity Testing Equipment and Process are configured to detect extremely fine porosity that may exist inside a DC cast billet or slab cross-section. Depending on the Hydrogen content of the melt and the depth of the sump during casting, as well as on other chemical and heat transfer characteristics involved during casting, an extremely varying and complex distribution of porosity can exist in the material. It is important to examine this porosity over the entire cross section of the cast product and not just in the isolated areas which pertain to metallographic microscopic examination. The spread of the porosity and the size of the pores can indicate if the porosity is purely due to Hydrogen, due to shrinkage, or due to both. Ultraviolet Testing Equipment is regularly used at facilities that are approved by airframe builders around the world.
Besides the processes utilized by LUMEX™ UV Testing Equipment, no other method (including ABB® Alscan™ nor Ultrasonic Testing) can expose the combined effects of Hydrogen porosity and shrinkage porosity simultaneously.