Study of microstructural inhomogeneity and its effects on mechanical properties of multi-layer laser welded joint
Study of microstructural inhomogeneity and its effects on mechanical properties of multi-layer laser welded joint
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多层激光焊接接头组织不均匀性及其对力学性能的影响研究
DOI：
10.1007/s00170-017-0944-3
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发表时间：
2018-02
期刊：
影响因子：
--
通讯作者：
Yuelai Zhang
中科院分区：
文献类型：
--
作者：
Xiong Zhang;Gaoyang Mi;Shuo Li;Xiyuan Hu;Chunming Wang;Yuelai Zhang
激光-电弧复合焊接是一种新兴的焊接技术，在厚板制造中具有广阔的应用前景。本文采用多层激光焊接技术成功连接了20mm厚板16MnDR对接接头。在此基础上，进一步研究了多层焊接接头的组织不均匀性及其对力学性能的影响。结果表明，多层焊接接头组织不均匀的原因有两个：一是不同的热输入和冷却速度导致了不同层的组织不均匀性；其次，层间区不同位置的不同热循环导致不同的组织转变，进一步加剧了多层焊接接头的组织不均匀性。结果表明，焊接接头的力学性能受到微观组织不均匀性的明显影响。从第1层到第4层，硬度分布总体呈下降趋势，层间区波动明显。所有冲击试样均发生韧性断裂，由于微观组织不均匀性和微孔洞增多，冲击韧性从第1层下降到第4层。此外，层间未清理的污染降低了焊接接头的抗拉强度。因此，在多层焊接工艺中，有必要在后期焊接前对前焊缝进行有效的清理。
Hybrid laser-arc welding is an emerging joining technology which has a promising prospect in thick plate manufacturing. In this paper, the thick plate butt joint of 16MnDR with 20 mm was successfully connected by using multi-layer laser welding technology. On this basis, the microstructural inhomogeneity and its influences on mechanical properties of the multi-layer welded joint were further investigated. The results indicated that microstructure of the multi-layer welded joint is inhomogeneous for two reasons: firstly, different heat inputs and cooling rates caused the microstructural inhomogeneity of different layers; secondly, different thermal cycles at different locations within inter-laminar zones led to disparate microstructure transformation and further intensified the microstructural inhomogeneity of the multi-layer welded joint. As a result, mechanical properties of the welded joint are obviously influenced by the microstructural inhomogeneity. From layer 1 to layer 4, the hardness distribution showed an overall downward trend and fluctuated obviously in inter-laminar zones. Besides, ductile fracture happened in all impact specimens, and the impact toughness decreased from layer 1 to layer 4 owing to the microstructural inhomogeneity and increasing microvoids. In addition, the uncleaned contamination between layers weakened the tensile strength of the welded joint. Thus, it is necessary for the multi-layer welding procedure to clear up former welds effectively before latter welding.
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DOI：
10.1016/j.msea.2013.05.077
发表时间：
2013-10-10
影响因子：
6.4
作者：
Chen, Yanbin;Feng, Jiecai;Ma, Guolong
通讯作者：
Ma, Guolong
影响因子：
0.9
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影响因子：
5
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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