Laser beam welding of titanium nitride coated titanium using pulse-shaping

Materials Research

Milton Sergio Fernandes De Lima¹ 

[1] ,Swiss Federal Institute of Technology Lausanne Laboratoire de Simulation des Matériaux Lausanne,Switzerland

关键词: laser beam welding;    titanium;    titanium nitride;   

DOI  :  10.1590/S1516-14392005000300017

来源: SciELO

【 摘 要 】

A new welding method which allows the assembly of two titanium nitride coated titanium parts is proposed. The welding procedure utilizes the possibility for pulse-shaping in order to change the energy distribution profile during the laser pulse. The pulse-shaping is composed of three elements: a) a short high power pulse for partial ablation at the surface; b) a long pulse for thermal penetration; and c) a quenching slope for enhanced weldability. The combination of these three elements produces crack-free welds. The weld microstructure is changed in comparison to normal welding, i.e. with a rectangular pulse, as the nitrogen and the microhardness are more homogenously distributed in the weld under pulse-shaping conditions. This laser pulse dissolves the TiN layer and allows nitrogen to diffuse into the melt pool, also contributing to an enhanced weldability by providing suitable thermal conditions.

【 授权许可】

CC BY   
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