Aluminum Die Cast Molds are subject to Heat and Corrosion resulting in Wear on Dies Typical materials used for aluminum die-casting dies are Material 1.2343 (X38CrMoV5-1) H11 and 1.2344 (X40CrMoV5-1) H13 GTAW (TIG) Welding is the preferred Welding Process to repair and rebuild damaged or worn Dies. ARCWEL 550 -GTAW (HRC 52-57) and GOLD 728 –T (HRC 34-36) are our most popular and proven Filler Rods for Repair and Maintenance of Aluminum Die Cast Molds by GTAW Welding