Esab Atom Arc 8018-B6L description: Atom Arc 8018-B6L deposits a low carbon 5% Cr, 0.5% Mo weld metal. It is designed for welding ASTM A200-T5, A335-P5, A387-Gr5 and similar steels. Applications tend to be in the petrochemical and petroleum industries, especially where hydrogen attack accelerates metal failure. Additionally, these steels are used in pressure vessels and piping for high temperature service.