This study investigated the applicability of low transformation temperature (LTT) arc welding consumables to improve fatigue strength against weld root failure. Transverse attachment joints formed by single-sided welding, similar to rib-to-deck connections in orthotropic steel bridge decks, were fabricated using an LTT welding consumable and conventional welding consumable. Fatigue tests were performed with out-of-plane bending loads using a vibration-type fatigue testing machine. The test results indicated that higher fatigue strength can be achieved in the joint with an LTT consumable compared with a conventional one. In addition, residual stresses around the weld bead were clarified by X-ray diffraction measurements and finite element analyses. The results revealed that the LTT consumable weld metal can reduce residual stress around the weld and also introduce compressive residual stress to the weld root, which can contribute to improved fatigue strength.

中文翻译：

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低转变温度焊接耗材的单面弧焊横向附着钢接头的疲劳强度

这项研究调查了低转变温度（LTT）电弧焊耗材在提高抗焊根故障的疲劳强度方面的适用性。通过单侧焊接形成的横向连接接头，与正交异性钢桥面板中的肋到甲板连接类似，是使用LTT焊接材料和常规焊接材料制造的。使用振动型疲劳试验机在平面外弯曲载荷下进行疲劳试验。测试结果表明，与传统的LTT耗材相比，使用LTT耗材的接头可获得更高的疲劳强度。另外，焊缝周围的残余应力通过X射线衍射测量和有限元分析得以澄清。