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- Title
Microstructural Inhomogeneity in the Fusion Zone of Laser Welds.
- Authors
Wang, Libo; Ma, Xiuquan; Mi, Gaoyang; Su, Lei; Zhu, Zhengwu
- Abstract
This paper investigated evolutions of α-Al sub-grains' morphology and crystalline orientation in the fusion zone during laser welding of 2A12 aluminum alloys. Based on this, a new method for assessing the weldability of materials was proposed. In laser deep-penetration welding, in addition to the conventional columnar and equiaxed dendrites, there also exhibited a corrugated structure with several 'fine-coarse-fine' transformations. In such regions, an abnormal α-Al coarsening phenomenon was encountered, with a more dispersed crystalline orientation arrangement and a decreased maximum pole density value. Particularly, structural alterations appeared more frequently in the weld bottom than the top. The above results indicated that the laser-induced keyhole presented a continually fluctuating state. Under such a condition, the solid–liquid transformation exhibited an unstable solidification front, a fluctuant undercooling, and a variational solidification rate. Meanwhile, the welding quality of this material is in a critical state to generate pores. Therefore, the appearance and relevant number of corrugated regions can be considered as a new way for judging the weldability, which will help to narrow the processing window with better welding stability.
- Subjects
FUSION zone (Welding); ALUMINUM alloy welding; LASER welding; WELDABILITY; WELDING
- Publication
Materials (1996-1944), 2023, Vol 16, Issue 21, p7053
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma16217053