I have to work on simulation of laser welding. I have studied numerous papers. All the papers speak of Gaussian Heat flux Distribution Model. I searched over the internet but couldnot find any link. Your help will be highly appreciated.
You could try read up on Gaussian distribution. This is a mathematical term which I'm sure you would be able to find a lot of in literature. I assume then that the heat flux (model?) is then simply distributed according to a Gaussian distribution.
It basically just means that at the surface the is interacting with, they define a heat flux (J, units of W/m^2 or similar) to be proportional to a gaussian, or normal distribution. There's a lot of information out there describing this model (wiki), you're looking for a 2D gaussian formulation that is a function of X and Y on the surface. Many lasers have near gaussian intensity distributions, so it's considered to be a pretty good assumption in many cases.
https://en.wikipedia.org/wiki/Gaussian_function
James Haley : I have one basic question about 2D gaussian heat source. I am using COMSOL and the axis in COMSOL are assigned as "r" and "z".
((2*p_laser)/(pi*r_spot^2))*exp(-(2*r_focus^2)/r_spot^2)
r_focus= sqrt((r-r_focus)^2+(z-z_focus)^2)
Now How can I be sure about the direction of the Heat source ? In 3D its simple. Please see the attached figure.
1. On z-axis
2. Towards r-axis
3. Into the plane.
How can I find the source power intensity for Gaussian distribution of heat flux in ansys act for tig welding and mig welding?
The temperature profile across a solidifying weld-bead fits a gaussian curve. It is based on the Rosenthals equation for 3D heat flow, for arc-welding. The higher the heat input, the flatter the curve, as weld-pool temperatures are relatively more uniform. Whereas lower heat input results in a higher temperature gradient, resulting in a more "pointy" curve
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