In situ analysis of the strain evolution during welding using low transformation temperature filler materials
In situ analysis of the strain evolution during welding using low transformation temperature filler materials
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DOI：
10.1080/13621718.2018.1525150
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发表时间：
2018-09
影响因子：
3.3
通讯作者：
J. Dixneit;F. Vollert;A. Kromm;J. Gibmeier;A. Hannemann;T. Fischer;T. Kannengiesser
中科院分区：
文献类型：
--
作者：
J. Dixneit;F. Vollert;A. Kromm;J. Gibmeier;A. Hannemann;T. Fischer;T. Kannengiesser
与使用低转变温度 (LTT) 填充材料的传统焊接耗材相比，这是一种减少由于焊缝马氏体转变延迟而产生的残余拉应力的创新方法。为了有效使用 LTT 填充材料，有必要更深入地了解多道焊接过程中导致最终残余应力状态的复杂过程。在德国光束线 HEMS@PETRAIII 现场研究了焊接过程中多道焊缝的转变动力学和应变演变。与传统焊缝相比，使用 LTT 填充材料时，总应变降低并实现了压缩应变。为了在多道焊缝根部充分利用 LTT 效应，必须调整合金化概念并注意稀释。
Compared to conventional welding consumables using low transformation temperature (LTT) filler materials is an innovative method to mitigate tensile residual stresses due to delayed martensite transformation of the weld. For the effective usage of LTT filler materials, a deeper understanding of the complex processes that lead to the final residual stress state during multi-pass welding is necessary. Transformation kinetics and the strain evolution of multi-pass welds during welding were investigated in situ at the beamline HEMS@PETRAIII, Germany. Compared to conventional welds, the total strain was reduced and compression strain was achieved when using LTT filler materials. For an optimal use of the LTT effect in the root of multi-pass welds, the alloying concept must be adapted taking care of dilution.