Characterization and formation mechanism of periodic solidification defects in deep-penetration laser welding of NiCrMoV steel with heavy section
Characterization and formation mechanism of periodic solidification defects in deep-penetration laser welding of NiCrMoV steel with heavy section
复制标题
大断面NiCrMoV钢深熔激光焊接周期性凝固缺陷特征及形成机制
DOI：
10.1007/s00170-018-2802-3
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发表时间：
2018-10
影响因子：
3.4
通讯作者：
Lu Fenggui
中科院分区：
文献类型：
--
作者：
Sun Yu;Cui Haichao;Tang Xinhua;Lu Fenggui
随着钢材厚度的增加，激光束焊接在厚截面上的应用引起了广泛的兴趣。对NiCrMoV钢厚板进行深熔激光焊接，分析了焊接缺陷的形成和分布特征。发现周期性缺陷多发生在距熔合线有一定距离的板焊缝中心纵断面处。由于焊接参数与焊缝轮廓不匹配，这些缺陷的形成和分布被认为是厚板深熔激光焊接所特有的。随着热输入的减小，缺陷敏感性先升高后降低，当熔宽比（长径比）大于4.0时，会出现大量的周期性凝固缺陷。通过光学显微镜（OM）、扫描电子显微镜（SEM）和能谱仪（EDS）对缺陷进行详细表征，证明周期性缺陷是焊缝中部横向柱状晶在充入足够液体之前接触和快速收缩引起的热裂纹缺陷。焊缝周期性凝固缺陷的形成与焊缝轮廓和受散热条件限制的冷却速率有很大关系。针对该钢的深熔激光焊接，确定了避免周期性凝固缺陷的优化参数。
With the thickness increasing of steel, application of laser beam welding on heavy section has been arousing broadly interests. Deep-penetration laser welding was performed on thick plate of NiCrMoV steel, and the characteristics of welding defects were analyzed in terms of their formation and distribution. The periodic defects were found to occur frequently at the central longitudinal section of the bead-on-plate welds that have a certain distance from fusion line. The formation and distribution of these defects were deemed as unique for deep-penetration laser welding on heavy plate due to mismatch of welding parameters with weld profile. Defect susceptibility was raised firstly and reduced subsequently as the heat input decreased, and a large amount of periodic solidification defects should occur when penetration-to-width ratio (aspect ratio) is higher than 4.0. By means of detail characterization on defect by optical microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS), the periodic defects were proved to be hot cracking defects induced by contact and rapid shrinkage of transverse columnar crystals in mid part of the welds before feeding in sufficient liquid. The formation of periodic solidification defects in welds was greatly related to weld profile and cooling rate limited by the heat dissipation conditions. The optimized parameters to avoid periodic solidification defects were determined for deep-penetration laser welding of this steel.
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影响因子：
6.2
作者：
Liu Peng;F. Lu;Xia Liu;Hui-jun Ji;Yulai Gao
通讯作者：
Liu Peng;F. Lu;Xia Liu;Hui-jun Ji;Yulai Gao
DOI：
10.1016/0308-0161(94)90143-0
发表时间：
1994
影响因子：
3
作者：
Yasuhiko Tanaka;T. Azuma;Noriaki Yaegashi
通讯作者：
Yasuhiko Tanaka;T. Azuma;Noriaki Yaegashi
大截面NiCrMoV钢多道焊接接头局部脆性区研究
影响因子：
2.7
作者：
Li Yifei;Cai Zhipeng;Li Kejian;Pan Jiluan;Liu Xia;Sun Lingen;Wang Peng
通讯作者：
Wang Peng
DOI：
10.1117/12.2254424
发表时间：
2017-02
期刊：
--
影响因子：
--
作者：
M. Schaefer;Steffen Kessler;P. Scheible;N. Speker;T. Harrer
通讯作者：
M. Schaefer;Steffen Kessler;P. Scheible;N. Speker;T. Harrer
DOI：
10.1007/s00170-016-8383-0
发表时间：
2016-02
期刊：
The International Journal of Advanced Manufacturing Technology
影响因子：
--
作者：
Yulong Zhang;F. Lu;H. Cui;Yan Cai;Song-tao Guo;Xinhua Tang
通讯作者：
Yulong Zhang;F. Lu;H. Cui;Yan Cai;Song-tao Guo;Xinhua Tang