鉄筋コンクリート用棒鋼のテルミト溶接に関する研究(第 2 報) : 溶接条件ならびに継手性質について

概要

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In this report, author has studied for welding condition and mechanical properties of weld joint by newly developed self preheating thermit welding on the basis of the first report stating the research for thermit mixture. The results are as follows; 1) The effect of refining time on soundness of thermit steel is evident, and this tells that an appropriate refining time gives a good notch toughness and elongation ratio to thermit steel. For 22mφ reinforcing bar, 3 to 5 seconds refining time seems to be fitting. 2) 30% thermit steel accomplished the purpose of preheating. If less than 30% is used, the preheating tends to be insufficient and necessary joint strength is not secured. 3) Welding gap chiefly depends on the relation between cross section of bar and sprue. A good result is obtained when welding gap is 15-35% of minor axis of oval sprue. 4) Tensile strength of weld joint is stronger than reinforcing bar. 5) In other mechanical properties, joint strength by this thermit process compares favorably with that of other processes. Therefore, the thermit welding by self preheating type can be easily and satisfactorily applied to field welding for reinforcing bar.
1965-07-25