各種鋼材突合せ溶接継手の疲れ強さ改善におよぼす低温加熱急冷条件の影響

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It was previously reported that fatigue strength of butt welded joint of SM41 steel, 60kg/(mm)^2 and 80kg/(mm)^2 high strength steels could be improved by hot dip galvanizing and quenching, and the reason for this improvement may be explained by compressive residual stress and aging effect by quenching from a temperature lower than A_1 temperature. This aging effect of steel plates depends on chemical composition, heating temperature, time and cooling rate. In the present study the effect of heating-quenching methods, temperature and artificial aging treatment on the improvement of butt welded joint are examined. The results by this experiment are as follows. 1. Fatigue strength of butt welded joints of three kinds of steel is improved by low temperature quenching. 2. In the case of the same heating temperature, furnace heating is more effective than hot dip galvanizing, because heating time in furnace is longer than in zinc bath. 3. In the case of mild steel and 50kg/(mm)^2 high strength steel, the higher the temperature beneath A_1 temperature is, the more increase in fatigue strength of welded joints is obtained. 4. In the case of 60kg/(mm)^2 high strength steel, it was observed that there was suitable heating temperature depending on the precipitation behaviour. 5. The most important factor in fatigue strength improvement by these heat treatments was considered aging effect. And spherization of cementite also seemed to be one of the factors in the case of 700℃ furnace heating-quenching.
社団法人溶接学会の論文
1976-11-05

各種鋼材突合せ溶接継手の疲れ強さ改善におよぼす低温加熱急冷条件の影響

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