Abstract
The purpose of this research is to study the effect of heat input on microstructure and hardness of SKD 61 hot work tool steel by using Gas Metal Arc Welding (GMAW) process. The specimens made of SKD 61 steel plates were austenized and oil-quenched to room temperature, then they were double tempered. Base on identical welding specification procedure (WPS), the specimens were automatically welded by GMAW machine. The consumable copper coated-solid wire electrode was used for surfacing in the GMAW process. The microstructures at the HAZ of specimens for all conditions were composed mainly of martensite with some retained austenite in the dendritic segregation pattern. With the higher heat input resulted in increasing in hardness, which resulted from transformation of retained austenite to martensite.
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