溶接継手の平面曲げ疲れ : その2,模型化した車両用継手についての軟鋼と高力鋼の比較

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  • Plain Bending Fatigue Strength of the Welded Joint : Report 2, In Comparison the High Tension Steel with the Mild steel, on the Joint-Model of the Rolling-Stock
  • ヨウセツ ツギテ ノ ヘイメン マゲ ツカレ 2

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To determine the fatigue strength of welded joints which is important in connection with design and manufacture of truck frame or axle and wheel, some brief plain bending fatigue tests were conducted on mild steel and high tension steel following Report 1, with the following results. (1) As high tension steel seems to be sensitive to notch, adequate care should be taken in the application of welding to this kind of steel, for welding is apt to leave unexpected shape defects on the surface of work. (2) Among various post-treatments, especially shot-peening was found effective for high tension steel. Annealing brought poor results for both of these materials, but a quite rough grinding of the toes, on the contrary, was effective to recover the fatigue strength. This fact should prove a useful hint for field workers. (3) From observation of the cracks developed in the vicinity of the toe, it was deduced that the condition in the direction of width of work should be considered to study crack propagation, in such cases as welding toes.

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