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Residual stresses analysis of ND-YAG laser welded joints

机译：ND-YAG激光焊接接头的残余应力分析

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摘要

Laser deposit welding based on modern ND-YAG lasers is a new mould repair process with advantages relatively to the traditional methods (micro-plasma and TIG methods), namely deposition of small volumes of the filler material without distortion. Residual stresses play a major role on the fatigue and thermal-mechanical fatigue behaviour of welds. This paper presents the experimental results and numerical predictions of the residual stresses in joints manufactured with two hot-working tool steels: X.40.CrMoV.5.1 and 40.CrMnNiM-0.8.6.4, in the laser-deposited layer and in the heat-affected zone. Welded specimens were prepared with U notches and filled with ND-YAG laser welding deposits. Trough-depth residual stresses evaluation after laser deposit welding were performed in order to analyse the influence of the residual stress state on fatigue behaviour of mould steels. Both X-ray diffraction sin~2 gamma method (XRD) and incremental hole-drilling technique (IHD) were used in residual stress measurement. Numerical predictions of the residual stress distributions were obtained for several values of the technologic parameters, compared with experimental results and discussed based on the assumptions stated.
机译：基于现代ND-YAG激光的激光熔敷焊接是一种新型的模具修复工艺，相对于传统方法（微等离子体和TIG方法）而言，即少量的填充材料沉积而不会变形，具有相对优势。残余应力在焊缝的疲劳和热机械疲劳行为中起主要作用。本文介绍了两种热加工工具钢X.40.CrMoV.5.1和40.CrMnNiM-0.8.6.4在激光沉积层和热中所产生的接头中的残余应力的实验结果和数值预测。受影响的区域。焊接的样品准备有U形缺口，并填充ND-YAG激光焊接沉积物。为了分析残余应力状态对模具钢疲劳性能的影响，进行了激光熔敷后的槽深残余应力评估。 X射线衍射sin〜2伽马方法（XRD）和增量钻孔技术（IHD）都用于残余应力测量。获得了一些技术参数值的残余应力分布的数值预测，并与实验结果进行了比较，并在陈述的假设基础上进行了讨论。

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