Flow characteristics and element distribution of melten pool in 22MnB5 laser welding with Al-Si coating

被引：0

作者：

Zhu L. ^{[1
]}

Wang Q. ^{[1
]}

Pan X. ^{[1
]}

Li S. ^{[1
]}

Ge X. ^{[1
]}

Zhang H. ^{[1
]}

Liu H. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Tongji University, Shanghai

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | 2024年 / 45卷 / 06期

关键词：

Al-Si coating 22MnB5 high-strength steel; homogenization of Al element; melten pool flow; numerical simulation;

D O I：

10.12073/j.hjxb.20230614003

中图分类号：

学科分类号：

摘要：

The flow behavior of the molten pool plays a decisive role in the distribution of coating elements in the weld seam. By establishing a three-dimensional transient numerical model of the laser welding molten pool, the flow behavior of the molten pool in laser welded of 22MnB5 high-strength steel with Al-Si coating and its influence on the distribution of Al elements in the weld seam were analyzed. In the welding experiment, The reliability of the numerical model was verified based on the scanning data of the welding joint using an energy spectrometer. The flow behavior of the laser welding melten pool and the distribution of Al element in the weld seam were studied by combining simulation and experimental results. The results showed that, according to the different energy and power density thresholds of the laser welding line, the morphology of the melten pool presented three characteristics: keyhole free, partially penetrated keyhole, and fully penetrated keyhole, with significant differences in temperature field, flow field, flow rate and stability. The keyless molten pool has the best stability due to its uniform flow velocity distribution and less vortex generation; The Al element in the coating is prone to segregation in the upper and lower weld toe areas of the welded joint. Compared to the upper surface coating, the Al element segregation phenomenon is more obvious when the lower surface coating enters the molten pool. Therefore, the homogenization distribution of the Al element in the upper part is significantly better than that in the lower part. Highlights: (1) A numerical model of molten pool flow for laser welding of 22MnB5 high-strength steel with Al-Si coating was constructed. (2) Revealed the characteristics of molten pool flow behavior in high-strength steel laser welding, and summarized the homogenization law of Al element in the coating in the weld seam. © 2024 Harbin Research Institute of Welding. All rights reserved.

引用

页码：1 / 11

页数：10

共 11 条

[1] Xie Xigui, Study on the dynamics and pore formation mechanism of laser deep penetration welding melt pool, (2021)
[2] Ye Ying, Simulation and experimental research on copper/aluminum laser assisted heating friction stir welding, (2016)
[3] Sun Zhichao, Simulation and process research on temperature field of resistance brazing of titanium steel dissimilar metals, (2020)
[4] Phanikumar G, Chattopadhyay K, Dutta P., Modelling of transport phenomena in laser welding of dissimilar metals, International Journal of Numerical Methods for Heat & Fluid Flow, 11, 2, pp. 152-174, (2001)
[5] Metais A, Mattei S, Tomashchuk I, Et al., Modelling of transport phenomena in laser welding of steels, COMSOL Conference, (2015)
[6] Li Lijun, Modern laser processing and equipment [M] Beijing: Beijing University of Technology Press, pp. 107-118, (1993)
[7] Subhashis R, Rafae A O., Simulation of liquid-vapour phase change process inside porous media using modified enthalpy formulation, International Journal of Thermal Sciences, 105, pp. 123-136, (2016)
[8] Yin X, Zarikos I, Karadimitriou N K, Et al., Direct simulations of two-phase flow experiments of different geometry complexities using Volume-of-Fluid (VOF) method, Chemical Engineering Science, 195, pp. 820-827, (2019)
[9] Liu Haijiang, Wang Qian, Zhang Heng, Et al., Analysis of temperature field and joint structure of laser brazing of galvanized steel plate based on CuSi<sub>3</sub> welding wire, Electric Welding Machine, 52, 11, pp. 14-21, (2022)
[10] Gao Z, Jiang P, Mi G, Et al., Investigation on the weld bead profile transformation with the keyhole and molten pool dynamic behavior simulation in high power laser welding, International Journal of Heat and Mass Transfer, 116, pp. 1304-1313, (2018)

← 1 2 →