アーク熔接法によるレール継目の接合に関する研究 (第2報) : 焼入レールの場合について

概要

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This is to report about a welding experiment performed in joining heat treated rails with the hardness of 308-390 Hv and high abraision resitance. The following are the, results summarized with some comments : - 1) In joining heat treated rails by manual arc welding, satisfactory joint strength can be obtained, when the bottom and web are welded with low hydrogen type electrodes, following 90% of the top part welding by means of the same type electrodes, and then the head surface is built up about 10 mm deep with the intention of hardfacing. The joining strength does not change by hard surfacing. 2) For padding the employment of Mn Austenite type or Martensite type electrodes cannot be recommended, because of the cracks occurring at the fusion line between padding and base metals. We advise the use of low Cr steel type electrodes whose welding hardness is compatible with that of rail head and the welded metal is difficult to cause cracking. 3) By welding, the surface hardness of rail head is softened over the range of about 10 mm from the fusion line. Rails post heated for 30 min. at 600℃ immediately after welding tend to be softened down to about 250-280 Hv. over the heating zone, but the micro-structure of the point 50mm apart from the fusion line is not remarkably changed, compared with the base metal structure.
社団法人溶接学会の論文
1958-11-25