Simulation Study on Laser Welding of High Strength Steel to Vehicle

2010 ◽  
Vol 143-144 ◽  
pp. 868-872
Author(s):  
Qiang Wu ◽  
Yong Tang ◽  
Yong Qiang Yang ◽  
Yu Zhong Li
Keyword(s):  
Thermal Conductivity ◽  
Temperature Field ◽  
Finite Difference ◽  
Difference Equation ◽  
Laser Welding ◽  
Stable State ◽  
High Strength ◽  
Control Mode ◽  
Finite Difference Equation ◽  
Technological Parameters

Based on quasi-stable state heat-transfer control mode, finite difference equation of thermal conductivity in laser welding is deduced. Physical parameter (specific heat) substitutes for phase-changing latent heat, then critical temperature of thermal conductivity welding is determined, so finite difference equation can be solved by MATLAB software. Temperature field distribution is simulated to weldment.Influence of technological parameters such as laser power and welding speed on temperature field are investigated systematically by numerical simulation, these can establish theoretical basis for optimization of technological parameters in laser welding.

Sur l'existence d'une longueur élémentaire et d'un intervalle de temps élémentaire

1978 ◽  
Vol 56 (8) ◽  
pp. 1109-1115 ◽  
Author(s):  
Robert Lacroix
Keyword(s):  
Finite Difference ◽  
Difference Equation ◽  
One Dimension ◽  
Time Interval ◽  
Finite Difference Equation ◽  
Elementary Length

We have briefly examined several studies which have been made concerning the introduction of an elementary length l0 and an elementary time interval t0 into physical theories. We have discussed the arguments which we have found, arguments formulated by other authors, and which support the hypotheses concerning the existence of l0 and of t0. A finite difference equation is proposed and the solutions of some problems of movement in one dimension are given.

ON SOLVING NONLINEAR FUNCTIONAL, FINITE DIFFERENCE, COMPOSITION, AND ITERATED EQUATIONS

Fractals ◽  
1999 ◽  
Vol 07 (03) ◽  
pp. 277-282 ◽  
Author(s):  
RAY BROWN
Keyword(s):  
Finite Difference ◽  
Difference Equation ◽  
Difference Equations ◽  
Finite Difference Equation ◽  
Euler Approximation ◽  
Nonlinear Functional ◽  
Finite Difference Equations ◽  
Wide Range ◽  
Iterated Equations ◽  
General Method

In this letter, we present a general method for solving a wide range of nonlinear functional and finite difference equations, as well as iterated equations such as the Hénon and Mandelbrot equations. The method extends to differential equations using an Euler approximation to obtain a finite difference equation.

Laser Welding on Material Used for Automobile Lightweight

2012 ◽  
Vol 442 ◽  
pp. 389-392
Author(s):  
Qiang Wu ◽  
Lan Ying Xu ◽  
Yu Zhong Li
Keyword(s):  
Laser Welding ◽  
Heat Affected Zone ◽  
High Strength ◽  
Deep Penetration ◽  
Technological Parameters ◽  
Welding Stability ◽  
Zinc Coated Steel ◽  
Protective Gas ◽  
Deep Penetration Welding ◽  
The Relationship

Based on a large number of welding tests to automotive lightweight material by CO2 laser, the microstructures of welded joint were tested related to performance. on the condition of welding technology, the relationship between the lower critical power of stabile deep penetration welding and welding speed and the focus position is deduced, In a coaxial and side protective gas conditions, through the optimization of technological parameters laser deep penetration welding can effectively avoid heat affected zone of high strength zinc coated steel becomes soft, welded comprehensive quality has been effectively controlled. Zinc evaporates unsteadily, which leads to expansion of heat affected zone and reduction of welding stability, so in this paper effective measures are taken to control it. Experimental results show that a qualified welding quality can be obtained by optimized process parameters of laser welding and adopting argon as shielding gas.

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