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We studied a newtype of weld groove named "Fusion type", which may be used for elimination of rail joints by arc welding. Using a ordinary mild steel electrode, the D. C. arc welding process was appllied under condition similar to that of field welding. Preheating as a preparatory measure for welding was not allowed. The result of the experiment were as follows. (1) "Fusion type" proved a suitable welded joint, which may be used for field welding of rail. (2) Bevel cut of railend by machining or flame cutting as preparatory step for arc welding, was not necessary. (3) As the color of rail become light red by arc fusion without preheating, the rail could be welded with good weldability. (4) Perfect annealing was found to be a desirable heattreatment for eliminating the residual stress and the hardened structure at the heat affected zone. (5) Penetration of rail base was found to be more important than that of other portion of the rail as regards statical bending strength. (6) Required bending strength of rail joints was a obtained by a skillfull and careful operation.
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