Doubled Fatigue Strength of Box Welds by Using Low Transformation Temperature Welding Material
Doubled Fatigue Strength of Box Welds by Using Low Transformation Temperature Welding Material
复制标题
使用低转变温度焊接材料使箱形焊缝的疲劳强度加倍
DOI：
10.1007/978-1-4615-1205-9_29
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Y. Maeda
中科院分区：
文献类型：
--
作者：
A. Ohta;N. Suzuki;Y. Maeda
研制了一种低相变温度焊接材料，通过在焊缝周围引入残余压应力来提高疲劳强度。所开发的焊接材料含有10%的铬和10%的镍，在约180°C时开始从奥氏体转变为马氏体，并在室温下完成。在转变过程中，焊缝金属膨胀。这种膨胀在20 mm厚的JIS SM 49 O钢板的焊接部分周围产生压缩残余应力。焊接残余应力的大小估计为约-100 MPa的开发接头，而这是约500 MPa的常规接头。残余压应力产生的应力比效应使疲劳强度提高一倍。传统箱形焊缝的疲劳极限为65 MPa，而开发的箱形焊缝的疲劳极限约为130 MPa。
The low transformation temperature welding material is developed to improve the fatigue strength by introducing compressive residual stress around weld. The developed welding material which contains 10% chromium and 10% nickel, begins to transform from austenite to martensite at about 180°C and finishes it at room temperature. During the transformation, the weld metal expands. This expansion induces the compressive residual stress around the welded part of 20 mm thick JIS SM49O steel plate. The magnitude of welding residual stress is estimated to be about -100 MPa for the developed joint, while that is about 500 MPa for the conventional one. The stress ratio effect due to the compressive residual stress makes the fatigue strength doubled. The fatigue limit for conventional box welds is 65 MPa, while that for developed one is about 130 MPa.