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The effects of heat input (1.5∼3.6 kJ/mm) and post weld heat treatment (PWHT, 600℃, 40hr.) on the TMCP HSB600 steel weldments made by GMAW process were investigated. The tensile strengths and hardness of as-welded specimens were decreased as heat input increased, but CVN (Charpy V-Notch) impact energy did not show any differences. The fine-grained acicular ferrite was mainly formed in the low heat input while polygonal and side plate ferrites were dominated in the high heat inputs. Meanwhile, tensile strength and hardness of PWHT weldments were decreased due to the coarsening and globular of microstructure as well as reduction of residual stresses. Key Words : HSB600 steel, GMA Welding, Welding process, Weldability, Mechanical property           . *  : (plorida@kut.ac.kr) 11 09 20  (1 11 10 27, 2 11 12 12)  11 12 13 1.    ,          .                   ·  [1].      ,       ,         . ‘   ’ HSB (High Performance Steel for Bridge)600  ,      [2].           ,       ,             TMCP (Thermo Mechanical Controlled Process)

The effect of Heat input and PWHT on the microstructure and mechanical properties of HSB600 steel weldments