... The shut proximity on the butt welds into the smelt spout openings and the main air port openings also indicates the corrosion may be caused by molten flowing smelt, a system proposed by Falat [12] to explain the corrosion of 304L composite tubes at Principal air port openings. arrangement http://building-inspection-servi75206.designi1.com/7072092/5-simple-statements-about-composite-cladding-port-douglas-explained