Laser-induction welding of nodular grey cast iron using oscillating beam guidance-microstructural and mechanical characterization

被引:4
|
作者
Sommer, N. [1 ]
Boehm, S. [1 ]
机构
[1] Univ Kassel, Inst Prod Technol & Logist, Dept Cutting & Joining Mfg Proc, Kassel, Germany
关键词
Laser beam welding; Nodular cast iron; Laser-induction welding; Oscillating beam guidance; Electron microscopy; Microstructure; WELDABILITY;
D O I
10.1016/j.jajp.2021.100078
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In the present investigation, laser-induction welding using oscillating beam guidance is employed to joint sheets of nodular grey cast iron, which typically exhibit poor weldability properties. Through non-destructive dyepenetrant testing, a reduction of more than 50% in crack density as a result of manipulted thermal cycles is identified. The microstructural and chemical characterization using scanning electron microscopy, energy dispersive X-ray spectroscopy and electron backscatter diffraction reveal the formation of brittle cementite lamellae with austenite/ferrite at the inter-lamellar spaces. The direction of beam oscillation and, thus, melt pool dynamics as well as thermal history exhibit a substantial influence on hardness and tensile properties, which are favourable for specimens welded with beam oscillation perpendicular to the traverse direction. Here, the maximum hardness of EN-GJS-400-15 specimens is reduced to around 700 HV. Yet, embrittlement and cleavage fracture originating from cold-cracks and pores within the weld metal are observed as well and emphasize the ongoing challenges of welding nodular grey cast iron.
引用
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页数:11
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