م مقاله کنفرانسی سال ۱۳۹۹ ۴۹۹ مشاهده Effect of GTAW heat input on microstructure of heat affected zone in AISI D2 steel In this study, the effect of GTAW heat input on the microstructure of Heat Affected Zone in AISI D2 stee… GTAWAISI D2 SteelWelding Heat Input