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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

Выпуски:
Том 23, 2019 Том 22, 2018 Том 21, 2017 Том 20, 2016 Том 19, 2015 Том 18, 2014 Том 17, 2013 Том 16, 2012 Том 15, 2011 Том 14, 2010 Том 13, 2009 Том 12, 2008 Том 11, 2007 Том 10, 2006 Том 9, 2005 Том 8, 2004 Том 7, 2003 Том 6, 2002 Том 5, 2001 Том 4, 2000 Том 3, 1999 Том 2, 1998 Том 1, 1997

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v4.i2.50
26 pages

Interactive Effects of Reactivity and Melt Flow in Laser Machining

Kai Chen
Department of Mechanical Engineering, Columbia University, New York, NY 10027
Y. Lawrence Yao
Department of Mechanical Engineering, Columbia University, 220 SW Mudd Building New York, NY 10027

Краткое описание

A numerical model is developed to study the oxidation effects in oxygen-assisted laser cutting of mild steel. Coupled oxygen concentration and energy balance equations are solved by a control-volume based computational scheme while the velocity field is obtained by analytical boundary theory. Theoretical explanation on striation formation is given based on an instability analysis of the molten front. The striation frequency and depth are predicted. The steady-state simulation results include the temperature and oxygen concentration profiles at the cut front, the effects of impurity gas on the cutting speed, reaction energy, conduction loss, and heat affected zone. The dynamic simulation shows the oscillation of the molten temperature that is related to striations. The striation frequency and depth are experimentally validated.


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