We suggested empirical formulae estimating tensile strength and yield strength of weld metal depend on cooling time and chemical composition (mCe) of weld metal. The cooling time is estimated by plate thickness, heat input and interpass temperature. However, the carbon equivalent of the weld metal mCeq can't be esitmmated by the chemical composition of weld wire(wCeq), because wSi and wMn are oxidized and WC, wMo are diluted to the steel plate. In this paper, for the purpose of simple estimation of strength of weld metal, mCeq is estimated by heat input and WCeq. As a result, the chart to predict the strength of the weld metal as a variable on interpass temperature and wCeq is suggested.
