UPGRADING OF CASTING
After the casting is taken from the mold will undergo Fettling process and testing.
Upgrading of casting is the process to remove the defects inside or on the surface of casting by grinding, gouging and welding the castings to meet the requirements.
Fettling is the process used to cleaning, polishing, and maintaining items from the casting from the mould, so that they will be functional or will remain functional.
Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done bymelting the work pieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressuresometimes used in conjunction with heat, or by itself, to produce the weld.
PRE & POST HEAT TREATMENT (Coil Type)
Heat Treatment is the heating of steel to relatively high temperature (Ex: 590c-700c) shortly after welding and maintaining that temperature for a specific period of time. The purposes is to reduce internal stresses, caused by welding, quench hardening or by cold working .It also has an advantageous effect on the elasticity, ductility and strength of the metal. Types of Heat Treatment Done: Annealing, Normalizing, Preheating, Post weld heat treatment, Solution Heat Treatment.