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-In this research, 9 SAW welding specimens with 1 hour post-heat treatment (PH1) and 2 hours (PH2) were experimented to confirm the weldability and the joint performance of 60mm thickness HSA800 steel. SAW tests with PH1 & PH2, including weld impact test, bend test, hardness test, macroscopic test, and microscopic test, had a good test results. However, from the chemical composition test results, P composition was not satisfied with Korean Industrial Standards(KS). According to the weld-zone tensile tests, 2 hours post-heat SAW is recommended because the mechanical characteristics of SAW PH2 were better than those of SAW PH1. Keywords -HSA800, TMCP, SAW, Weldability, Welded joint performance, Post heat treatment, Homogeneity . 또한 용접부의 안전성은 주요 하중전달 부재 및 구조시스 템 간의 접합부에서 중요한 문제이며 [5] , 고강도·후판 강재 일수록 용접성능을 확보하는데 있어 용접재 설계, 용접사의 기 능도, 용접조건 등을 고려하여 종합적으로 검토하여야 한다.