A Study for the Weldability and Welded Joint Performance on the SAW of HSA800 Steel

본 연구에서는 HSA800 60mm 강재의 SAW 용접성 및 이음성능을 확인하기 위해 후열처리 1시간과 2시간에 대한 SAW 공시체를 제작하여 9종의 시험을 실시하였다. 용접부 충격시험, 굽힘시험, 경도시험, 매크로조직시험, 마이크로조직시험 결과 SAW PH1 및 PH2는 양호한 용접부로 나타났으나, 화학성분시험 결과 P성분이 KS를 만족하지 못하였다. 용접부 평판 및 봉형 인장시험결과 SAW PH1에 비하여 PH2의 기계적 특성이 양호하게 나타났기 때문에 SAW의 경우 후열처리는 2시간을 권장한다. 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.