Investigation on hot cracking during laser welding by means of experimental and numerical methods

被引：7
作者：
Gao, H. [1 ]
Agarwal, G. [1 ]
Amirthalingam, M. [2 ]
Hermans, M. J. M. [1 ]
Richardson, I. M. [1 ]
机构：
[1] Delft Univ Technol, Mat Sci & Engn Dept, Mekelweg 2, NL-2628 CD Delft, Netherlands
[2] Indian Inst Technol Madras, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India
来源：
WELDING IN THE WORLD | 2018年 / 62卷 / 01期
关键词：
Hot cracking; Laser welding; Digital image correlation; Finite element model; Temporal and spatial validation; SOLIDIFICATION CRACKING; MULTIPASS WELDS; CRITERION; STEELS; GROWTH; STRAIN; TESTS;
D O I：
10.1007/s40194-017-0524-z
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Hot cracking during laser welding of Transformation Induce Plasticity (TRIP) steel at the edges of steel flanges can be a problem. In this study, modified hot cracking tests were performed by welding on a single-side clamped specimen at various distances from the free edge, while the heat input and external constraints remained constant. In situ temperature and strain measurements were carried out using pre-attached thermocouples and digital image correlation, respectively. A thermal-mechanical finite element (FE) model was constructed and validated with the temporal and spatial data measured. From the validated FE model, the temperature and strain evolution in the weld mushy zone were studied. A critical strain for the onset of hot cracking in the TRIP steel examined was found to be in the range of 3.2 to 3.6%. This threshold was further evaluated and experimentally confirmed by welding with different heat inputs.
引用
收藏
页码：71 / 78
页数：8
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