Effects of Heat Treatment on the Impact and Hardness Properties of Mild Steel [ASTM 36] Lap Welded Joint

ASTM A36 is the most used type of mild steel especially in construction and manufacturing industry. Welding process regularly employed to fix crack that usually occurs low carbon after a long time use In this study, effects heat treatment on mechanical properties [ASTM A36] lap welded joint were investigated. Seven pieces 60 mm × 300 bar for research. Five samples treated an electric muffle furnace soaked at 600 0 C 65 minutes. Two cooled air while remaining three rapidly quenched water, spent engine oil diesel each . Hardness Impact tests specimens made from control (as received) sample various heat-treated samples. The joined together using E6361 arch welding electrode, joints Shielded Metal Arc (SMAW). test impact are delineate specimens. It was established research work Brinel Number (BHN cooled/quenched different media increased it significantly Heat affected Zone (HZ) all quenching media. There also substantial increase both Energy (IE) Strength (IS) when cool/quenched air, furnace, water oil.