14mm steel plates (Wel-ten 50) and 20 mm steel plates (Wel-ten 55) of high tensile Mn-Si steels were used. The single bead was deposited on these plates and the change, by preheating with flame, of cooling curve about the heat-affected zone (the neighbourhood of fusion line), was investigated. According to this result, the cooling curve after welding shows a more gradual slope as the preheating temperaiure rises to about 350•Ž.
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