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高張力鋼材에 大入熱 熔接時의 熔接部의 熱Cycle 및 組織 變化
裵且憲 釜山工業大學校 1983 論文集 Vol.24 No.2
This study was carried out in order to consider quantitative the change of Microstructure and Hardness in welded zone between shielded Manual Arc Welding(SMAW) and Electro Gas Welding(EGW) of domestic HT-50 Class Steel. The results gained were as follows: 1) SMAW was showed faster cooling phenomenon than that of EGW from the thermal history curve between 800℃ and 500℃ 2) After welding of high heat input, the maximum value of hardness was showed Hv 220, this hardness value was lower than Hv350 in JIS 3) The prior austenite grain size of EGW was larget two times than that of the SMAW
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大入熱 高張力鋼 熔接部의 機械的 特性 變化에 關한 硏究
裵且憲 釜山工業大學校 1983 論文集 Vol.24 No.2
The mechanical and microstructural properties in high heat input welds of homemade SM 50 high strength steels were investigated and compared with the manual shileded metal arc welds. Also, the fracture toughnesses of the simulated weld-bonds with various thermal cycles were quantitatively examined in order to provide the basic data for furthur development of the high strength steels for high heat input welding. Main results obtained are as follows. (1) The embrittlement degree and the coarse grained region in high heat input welds appeares to be extra ordinary large compared with the manual shielded metal arc welds wwhile the difference in change of microhardness is not so large in both welds. (2) The embrittleness in high heat input weld-bond is mainly affected by the size of coarse grain rather than the microstructure. (3) The fracture toughness in high heat input weld-bond can be improved by controlling the cooling time from 800℃ to 500℃ rapidly.
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